CA1320749C - Electronic programmable thermostat for a heating and cooling system with an oscillation control mechanism - Google Patents
Electronic programmable thermostat for a heating and cooling system with an oscillation control mechanismInfo
- Publication number
- CA1320749C CA1320749C CA000614940A CA614940A CA1320749C CA 1320749 C CA1320749 C CA 1320749C CA 000614940 A CA000614940 A CA 000614940A CA 614940 A CA614940 A CA 614940A CA 1320749 C CA1320749 C CA 1320749C
- Authority
- CA
- Canada
- Prior art keywords
- temperature
- switched
- heating
- cooling
- cooling system
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/1906—Control of temperature characterised by the use of electric means using an analogue comparing device
- G05D23/1912—Control of temperature characterised by the use of electric means using an analogue comparing device whose output amplitude can take more than two discrete values
Abstract
ABSTRACT
A programmable thermostat for an air conditioning system includes a sensor for sensing the ambient temperature within the predetermined volume of space, a timer for generating the current time of day, and a memory for storing a plurality of program times, and a heating and a cooling control temperature corresponding to each program time. The memory also stores a first temperature span associated with the heating control temperatures and a second temperature span associated with the cooling control temperatures. The programmable thermostat further includes a controller which selectively controls the on/off state of the air conditioning system in response to (1) a comparison of the current time of day with the program times stored in the memory to access the corresponding current heating and cooling control temperatures stored in the memory and (2) a comparison of the current ambient temperature sensed by the sensor with the current heating and cooling control temperatures stored in the memory.
A programmable thermostat for an air conditioning system includes a sensor for sensing the ambient temperature within the predetermined volume of space, a timer for generating the current time of day, and a memory for storing a plurality of program times, and a heating and a cooling control temperature corresponding to each program time. The memory also stores a first temperature span associated with the heating control temperatures and a second temperature span associated with the cooling control temperatures. The programmable thermostat further includes a controller which selectively controls the on/off state of the air conditioning system in response to (1) a comparison of the current time of day with the program times stored in the memory to access the corresponding current heating and cooling control temperatures stored in the memory and (2) a comparison of the current ambient temperature sensed by the sensor with the current heating and cooling control temperatures stored in the memory.
Description
1 32~749 ELECT~ONIC PROGR~M~LE THEP~MOSTAT FOR
A HEAIING AND COOLIMG 5YSTE~q WITH
AN OSCII.LAl'ION CONTP~OL MEC~IANISM
The pre~nt invention ~ener~y r~lat~s to p~grammabla thel~
mostats and, more partlcularly, to a~ el~ctronl~ programmabls the~
m~itat tor a heating and c3011ng system having an 06cillation control me~h~nism.
Prs~rammable thermo~ta~s haYe greatly in¢rease~ ~he degree ~o whl~h a ussr can control air CO~ ioning systems. ~'Alr condition-in~ sy~tem~ ~ used herein wlll generally ~er to both heatin~ and coo~ en~. Pr~rammability permits users to program a plural-ity oI ~amperan~ settins ~or a plurality ~ program times.
Prc~rammab~lity permits high efficien~y opera~lo~ and c~n r~;ult ln su~sta~tial e~gy savings. For example, i~ ar~ air conditionlng system ls utilized ts control the temperatu~ OI a pe~nal residen e, the oa/
o~ swltcl~ng o~ the alr ~onditionlng system may ~e pre~is0ly dete~
mined~ It is deslrable to haYe the residenc~ eontrolled ~o a comfort ~emperatur~ ~urlnx times ol occupan~y, but i~ th~ ~nteres~ o~ energy conservatioll, it is further desirable to have th~ system control the ~mbien~ temperat~re to some temperature oth~r than the comIort temperatulre d~ng other times.
1 32074q In a particular ~xample, a ~r may program hiS thermo~tat sueh that tha cooling system alay be switched on at S:00 P.M. to ~ool the residence to the program tem~eraturs ot 78 by 6:00 P.~l. when the user returns home ~rom work. The program temperatllre o~ 7~
may be maintaln~ by the eherm~tat untll 11:00 ~.hq. ~hen th~ occu-pants g~ ~o ~. The air conditloner the~ may ~ pro~r3~me~ to malrltain the house at 76 ov~ ght.. PPom 7.30 A.M. to ~:00 A.M., lt may be desirable to ha~e the temperan~ controllled to 7~. The ~emperature then may be set up to ,B5 durlng the day ~rom 9:00 A.~q.
to 5:00 P.M. In order to con~srva energy. I~ mportant that the temperature not ~ permi~ o r~æ too mu~h during th~ upied period; or e~ the system may require so much energy to bring the ambieslt temperature to the program t~mperature that energy savings are el~minat~d. A slmilar s~hedule may be prcgrammed i'or ~he heat-ing sgstem durlng w~tertime, Varlous programs may be ~reated and moc~i~ to suit user style. Dil'l'erent programs may be enter~d to ~ntrol ~he air con~i-tion~ system over weelcends when a user is L~ely ~o be home at di~'-rerent hou~.
A singla ~hermo~tat may, ~n some instances; ~ programmed wi~h bo~h a heating and a cooling program s~h~uleO In some situa-tions, It i~ de~abl~ to control the am~ient tempera~ure in a tempera-ture controlled region ov~r a rather small temperature range. This may requlre se~ting the heating and conling control temperatures close to nn:a aQother. Such setting~, while providing the prec~ tem-perature control reqldred, can a~;o result in rapid o~cillation between 'I ~2~74q heating and c~ling syst~ms. Th~s ~ apid ascillation ~s un~sirable and iDe~ ierlt an~ can ~ause damage to bot71 the heatir~ and cooling s~tems.
Accordlngly 1~ ~ an ob~t ~ the present inv~ntion to proYide an electroni~ progra~able therma;tat which preven~i rapld 06cilla-tion between heatlng aDd cooling sy~tems.
It is anoth~r ob~t ~ the pr~ent invention to provld~ a method tor co~trolling the alter~atlon ~etween the heat~n~ and c~l-ing systems o~ an air ~ondltionlng ~t~m.
In accorflance with ~e present invention a programmable thermostat for an air conditioning system having a heating system and a cooling system is provided ~or controlling the ambient temperature vf a predetermined volume of space, said programmable thermostat . .
compnslng:
sensor means ~or sensing the ambient temperature of the prede~ermined volume of space;
timing means for generating the current time of day;
memory means for storing an operating pro~ram including a plurality of program ~mes, a heating and a cooling control temperature corresponding to each program ~me, a first temperature span associated with ~e heating control temperatures which :first temperature span determines a first temperature for each program time at which said heating system is switched on and a second temperature for each program time at which said heating sysgem is switched off, and a second temper~ture span associated with the cooling control temperatuTes which second temperature span dete~nines a third temperature ~or each program time at which said cooling system is . ~-, r - , ~
switched on and a ~ourth temperature for each program time at which said cooling system is switched ofF;
control means for selectively controlling the on/off state of said heating and cooling systems in response ~o ~1) a comparison of the current time of day with the program times stored in said memory means to access the corresponding ourrent heating and cooling control temperatures and their associated first and second temperature spans stored in said memory means and (?) a comparison of the current ambient ~emperature sensed by said sensor means with the current first, second, third and four~ temperatures to generate a switching control signal for controlling the on/off ~tate of said heating and cooling systems; arld adjusting means for adjusting (1) at least the current third temperature prior to switching on said cooling system in response to the switching control signal after said heating system is switched o:fF at the cur~ent second temperature or (2) at least the current first temperature prior to switching on said heating system in response to the switching control signal after ~aid cooling system is switehed off at the current fourth temperature.
A more ~omplete appr~lation o~ ~he preSet in;r~n~ion and many of the attendant advan~ages the~o~ wlll ~e obeained as the invention be~om0s b~tter under~e~d by reI~ren~e ~o ehe iollowlng deta~ed des~rlp~ion when ~or~d~red ln conn~tioa with the accom panging drawings.
~ i~e 1 illustrate~; a hea~ing and cooling æquence where the programme~ heatin~ and cooling temp~ratures are wld~ly spaced.
1 32Q:749 ~ igure 2 illus~rates a heating and ~Ollflg sequ2nce wh~ the proBrammed heati~ and ~llng tempel a~ ar~ ~qu~.
Figure 3 lllustrates a heatillg and eoolin~ s~qu~nce a~corcnn~ to one embo~ment o~ Ule pres~nt inventlon.
Figure ~ is a hardwa~ dlaE~am ol~ a ~h@rms6~a~ which may emkoo`y the pr~rlt inven~iol~
Fi~ S i~ a ~low c~a~am Or the ~cillla~io~ ~ontrol m~hardsm acco~ to o~le em~m~nt o~ the~ pre6en~ inve~orl.
The pre~rlt invention relate~ to a prograDnmable ele~tronic thermosta~ whlch may be programmed with both heating and c~ng ~emp~ratures. Sueh thermostats m~y ir~lude an autoznatic m~ in wh~ch both ~ heatlng and c~llng systems will be ~ tively ae~i-vated in order to main~ the program tempera~. ~owever, 1~
the programmed heating and eooLing temperatur@~ are too close togegher, th~ heating and c~ling sy~ems may o~c~Uate.
The term span as us~d here~low re~ers ~o the liDnits ot the upper and lower levels oI the program temperatu~. For e~ample, ~
the programm~ heating t~mperature is 88~F as ~how~ In Figure 1, the h~t wlll swit~h on at 67F ~1F below the program temperature) and swlt~h ofI at 70F (2F a~Dve ~h~ pr~gram temperature). Su~h on/o~ swlt~hing o~ the heating system wL~I control the amblent tem-peratura within thls 3 span. In a stmllar manner, U the prograMmed coolillg temperature is ~8F, the cooling system wlll swltch on at 80F (2F above the program ~emperacurej and switeh ofI ac ~?F
(1F below the program temperature). A su~table span ~q generally 1 3207~q preset In the thermastat p~gram or may be programmed by a user to a selected ilzed or variable num~er.
A typl¢al hea~in~coollng prt~ram i5 shown in Table I.
T~L~ I
ing Coo1in~
Progra~ # ~ T~p. T~p.
6:00 A.M. 68P 78F
A HEAIING AND COOLIMG 5YSTE~q WITH
AN OSCII.LAl'ION CONTP~OL MEC~IANISM
The pre~nt invention ~ener~y r~lat~s to p~grammabla thel~
mostats and, more partlcularly, to a~ el~ctronl~ programmabls the~
m~itat tor a heating and c3011ng system having an 06cillation control me~h~nism.
Prs~rammable thermo~ta~s haYe greatly in¢rease~ ~he degree ~o whl~h a ussr can control air CO~ ioning systems. ~'Alr condition-in~ sy~tem~ ~ used herein wlll generally ~er to both heatin~ and coo~ en~. Pr~rammability permits users to program a plural-ity oI ~amperan~ settins ~or a plurality ~ program times.
Prc~rammab~lity permits high efficien~y opera~lo~ and c~n r~;ult ln su~sta~tial e~gy savings. For example, i~ ar~ air conditionlng system ls utilized ts control the temperatu~ OI a pe~nal residen e, the oa/
o~ swltcl~ng o~ the alr ~onditionlng system may ~e pre~is0ly dete~
mined~ It is deslrable to haYe the residenc~ eontrolled ~o a comfort ~emperatur~ ~urlnx times ol occupan~y, but i~ th~ ~nteres~ o~ energy conservatioll, it is further desirable to have th~ system control the ~mbien~ temperat~re to some temperature oth~r than the comIort temperatulre d~ng other times.
1 32074q In a particular ~xample, a ~r may program hiS thermo~tat sueh that tha cooling system alay be switched on at S:00 P.M. to ~ool the residence to the program tem~eraturs ot 78 by 6:00 P.~l. when the user returns home ~rom work. The program temperatllre o~ 7~
may be maintaln~ by the eherm~tat untll 11:00 ~.hq. ~hen th~ occu-pants g~ ~o ~. The air conditloner the~ may ~ pro~r3~me~ to malrltain the house at 76 ov~ ght.. PPom 7.30 A.M. to ~:00 A.M., lt may be desirable to ha~e the temperan~ controllled to 7~. The ~emperature then may be set up to ,B5 durlng the day ~rom 9:00 A.~q.
to 5:00 P.M. In order to con~srva energy. I~ mportant that the temperature not ~ permi~ o r~æ too mu~h during th~ upied period; or e~ the system may require so much energy to bring the ambieslt temperature to the program t~mperature that energy savings are el~minat~d. A slmilar s~hedule may be prcgrammed i'or ~he heat-ing sgstem durlng w~tertime, Varlous programs may be ~reated and moc~i~ to suit user style. Dil'l'erent programs may be enter~d to ~ntrol ~he air con~i-tion~ system over weelcends when a user is L~ely ~o be home at di~'-rerent hou~.
A singla ~hermo~tat may, ~n some instances; ~ programmed wi~h bo~h a heating and a cooling program s~h~uleO In some situa-tions, It i~ de~abl~ to control the am~ient tempera~ure in a tempera-ture controlled region ov~r a rather small temperature range. This may requlre se~ting the heating and conling control temperatures close to nn:a aQother. Such setting~, while providing the prec~ tem-perature control reqldred, can a~;o result in rapid o~cillation between 'I ~2~74q heating and c~ling syst~ms. Th~s ~ apid ascillation ~s un~sirable and iDe~ ierlt an~ can ~ause damage to bot71 the heatir~ and cooling s~tems.
Accordlngly 1~ ~ an ob~t ~ the present inv~ntion to proYide an electroni~ progra~able therma;tat which preven~i rapld 06cilla-tion between heatlng aDd cooling sy~tems.
It is anoth~r ob~t ~ the pr~ent invention to provld~ a method tor co~trolling the alter~atlon ~etween the heat~n~ and c~l-ing systems o~ an air ~ondltionlng ~t~m.
In accorflance with ~e present invention a programmable thermostat for an air conditioning system having a heating system and a cooling system is provided ~or controlling the ambient temperature vf a predetermined volume of space, said programmable thermostat . .
compnslng:
sensor means ~or sensing the ambient temperature of the prede~ermined volume of space;
timing means for generating the current time of day;
memory means for storing an operating pro~ram including a plurality of program ~mes, a heating and a cooling control temperature corresponding to each program ~me, a first temperature span associated with ~e heating control temperatures which :first temperature span determines a first temperature for each program time at which said heating system is switched on and a second temperature for each program time at which said heating sysgem is switched off, and a second temper~ture span associated with the cooling control temperatuTes which second temperature span dete~nines a third temperature ~or each program time at which said cooling system is . ~-, r - , ~
switched on and a ~ourth temperature for each program time at which said cooling system is switched ofF;
control means for selectively controlling the on/off state of said heating and cooling systems in response ~o ~1) a comparison of the current time of day with the program times stored in said memory means to access the corresponding ourrent heating and cooling control temperatures and their associated first and second temperature spans stored in said memory means and (?) a comparison of the current ambient ~emperature sensed by said sensor means with the current first, second, third and four~ temperatures to generate a switching control signal for controlling the on/off ~tate of said heating and cooling systems; arld adjusting means for adjusting (1) at least the current third temperature prior to switching on said cooling system in response to the switching control signal after said heating system is switched o:fF at the cur~ent second temperature or (2) at least the current first temperature prior to switching on said heating system in response to the switching control signal after ~aid cooling system is switehed off at the current fourth temperature.
A more ~omplete appr~lation o~ ~he preSet in;r~n~ion and many of the attendant advan~ages the~o~ wlll ~e obeained as the invention be~om0s b~tter under~e~d by reI~ren~e ~o ehe iollowlng deta~ed des~rlp~ion when ~or~d~red ln conn~tioa with the accom panging drawings.
~ i~e 1 illustrate~; a hea~ing and cooling æquence where the programme~ heatin~ and cooling temp~ratures are wld~ly spaced.
1 32Q:749 ~ igure 2 illus~rates a heating and ~Ollflg sequ2nce wh~ the proBrammed heati~ and ~llng tempel a~ ar~ ~qu~.
Figure 3 lllustrates a heatillg and eoolin~ s~qu~nce a~corcnn~ to one embo~ment o~ Ule pres~nt inventlon.
Figure ~ is a hardwa~ dlaE~am ol~ a ~h@rms6~a~ which may emkoo`y the pr~rlt inven~iol~
Fi~ S i~ a ~low c~a~am Or the ~cillla~io~ ~ontrol m~hardsm acco~ to o~le em~m~nt o~ the~ pre6en~ inve~orl.
The pre~rlt invention relate~ to a prograDnmable ele~tronic thermosta~ whlch may be programmed with both heating and c~ng ~emp~ratures. Sueh thermostats m~y ir~lude an autoznatic m~ in wh~ch both ~ heatlng and c~llng systems will be ~ tively ae~i-vated in order to main~ the program tempera~. ~owever, 1~
the programmed heating and eooLing temperatur@~ are too close togegher, th~ heating and c~ling sy~ems may o~c~Uate.
The term span as us~d here~low re~ers ~o the liDnits ot the upper and lower levels oI the program temperatu~. For e~ample, ~
the programm~ heating t~mperature is 88~F as ~how~ In Figure 1, the h~t wlll swit~h on at 67F ~1F below the program temperature) and swlt~h ofI at 70F (2F a~Dve ~h~ pr~gram temperature). Su~h on/o~ swlt~hing o~ the heating system wL~I control the amblent tem-peratura within thls 3 span. In a stmllar manner, U the prograMmed coolillg temperature is ~8F, the cooling system wlll swltch on at 80F (2F above the program ~emperacurej and switeh ofI ac ~?F
(1F below the program temperature). A su~table span ~q generally 1 3207~q preset In the thermastat p~gram or may be programmed by a user to a selected ilzed or variable num~er.
A typl¢al hea~in~coollng prt~ram i5 shown in Table I.
T~L~ I
ing Coo1in~
Progra~ # ~ T~p. T~p.
6:00 A.M. 68P 78F
2 11:00 A.~l. 55 82 3 ~:OO P.M. 1;90 78 lltOO P.~. 60 77 The operatlon ot a therm Dstat in au~omatlc m~ wlll be explained wlth ret~ren~ ~o Table I and Flgure 1. ~t ~:00 A.M., ~or example, 1~ the ambient temperature ~s below 68~, the heatln~ sys-tem will swltch on to ~ontnDl the ambient temperature around 68 F in accorda~ce wlth the programmed span. If, between ~:00 A.M. and 11:0Q A.M., the amblerlt temperature rise~ to a~ve 78 due to chaages ill weather con~tions, tor example, the cooling program will become cperative and swltch on the c~ng system to ~l~trol the am~ient temperanlre around ~8F. Similarly, at ~:00 P.M., i~ the ambient temperature ~a~ below 6~F, the heanng s~tem will con-trol the t~mperanJre. On the othe~ hand9 ~ the amblent t~mperature r~es a~ve 78F, the c~ling sys~em w~ cont~l the ambient ~empera~u.~.
In som~ instances, the programmed heating and cooling tem-peratures may be very close together. Table II illustrate~ such a si~uation.
T~BLE ~ I
Heatln~ Coolin~
Program t~ Tin~eTeaop. Temp.
1 32~74~
6S00 A.M. 76P 75P
2llsOO A.~. 75 76 3~sOO ~.M. 69 73 611:00 P.M. 60 77 The abDv~ sltuation may be created ~dver~ent~y by the user upon program~ng the thermo~at. ` It may a~o occur where a U~8P de~res to ~ontrol the am~lent temp~rature oYer a r~latively narrow range.
As e~ ned ln iur~er detall bBlO~tY9 ~rlth su~h heæ~ arld eoollne program~, it is ~cely that the hea~ng ~d coolln~ ~ystems ~i~
at~.
For e~rample, a6~ation wlll a~ur ii th~ ~emperature span ~s 3F, that Is9 1 below the setpoint ~nd 2~ above the ætpoint as shown in Flgure 2. 1~, between 6:00 A.M. and 11:00 A.~8., the ambient temperat~ ~alls below ?6 to 75, the hea~ wlll swlt~h on and raise the ~emperanlre to 7~ (2 a~ve the hea~ng sst~n~). As soon as the amblent temperatu~ r~ach~s ~8 (2~ above the ~oo3ing se~polnt), the ~oolin~ syst~ wlll swit~h or~ to lower the tempera~ure to 75~ ~1 below ehe ~ooling sstpoint). Howev~r, a~ 75 3 ~ the heatix~ ~y~tem will swl~ch Qn and the systems will cycle ~n~uously.
In a ~lar manner, betwe~ 00 A.Mb ar~d ~:00 P.~q., i~ the ambien1: te~peran~ ralls to ?4 ~ low the heaeing setpoint), ~he h~at will swit~h on and operate u~til ~he ambient tempera~ure reaches 77 (2~ above the heatin~ ~po~t). La~er, when a slight change in ~onditlon~ raises the am~ient tempera~ure by 2 single degree to 78F (~ above cooling setpoin~), the ~ollng system will switch on to lower the ambient tempsrature to 75 (1 below the coolin~ satpoint). However, as soon ~ an addit1Onal 1~ drop o¢curs, the heae will again switch on and the alternating ey~ling b~twe~n systems wlll contlnue thereat~er with only a shor~ ~ime pe~od there~tween.
The present lnven~on preven~s ~his cy~ling ar osclllatlorl by ch~lng the temperature span to a new valu~ ~ust prlor to or any time bs~ore the d~ ~over or alterna~lon to the o~her sy~tem. The new value OI the temperature span at the tL~ of ch21lg~ver is di~-~erent ~ thB Sp~ ~ ly d~d.~l~d Into th~ s~rst0~. C)w~ ths cha~Dver takes pla~ the span re~ to th~ desl~ed span or the new span ~a~ be used permanently Xor ehat program. The new span may ~ g, 5, 6~, et~. wlth equal or unequal t*mpera~ limi~s above and below the ~etpoint tempera~.
Utilizln~ programmed hea~ng and coollng temperatures shown ln Table II ar~ wlth rererence to Flgure 3, betwe~rl 6:00 AoM~
and 11:00 A..M., the heat wlll swlt~h orl at 75 and swltch ~r at 78a, in accordance with the 3 span. However, a~ 7~, th~ coallng system w~ no~ swit~h o~. Ra~her, the 3pan whl~h is currently 3 (2 above ~he setpoint tgmp~t~s, 1~ ~ow) is changed to a new valu~. This nes~r value may b~ preprogramm~d iQto th~ micropr~s~or. Alterna-tive3y9 th~ s~w span may b~ ~alculaeed by a gormula CoDtain0d iDI ~h~!
ml~roprw~or or p~gramm~ externally. The span may ~e chang~d to, ~or e~sampl~, 5F, or ~ above the setpoint and 1 1:~314W. Because o~ this chan~ in ~pan, the ~oolin~ sys~em wlll nog swi9~ch orl at ~8F, but wlll rather ~ ~layed until 8û", ~ abov~ ~he cooling set2oin~ as indl~ated at A. Once the ~hang~over ea~e~ place at 8û'99 the span automatically chang~æ9 back to 3, or 2 a~9Y~ and 1 below. Thus, when the ~ ne sy~tem brings the ambiene tempes ature down ~o 75 g (1 helow th~ ~oollng setpolnt), the cooling system Is swltch~d ott a~
~Ddicat~d ~t B. Again, however, the h~atlng syst~m Wlll n~t swl~ch on immediately. The span prior ~o Iswitchin changes ïrom 3, or 2 a~ove and 1 below, to 6Q, or 2 abovs and 4 ~low, Ior example.
Thus, the heat will not swltc~ on u2lt~1 72, ~IL b~low the h~ating setpDint a~ lndi~ated at D. As b~fore, the sQan is automaticaLly r~;et to ~he pr~programmed value o~ 3''. Thus, the h~at w~ switch ~ at 78F as ladl¢ate~l at F. A~ pr~ously noted, the new span~ may ~
e~feetive throughou~ the program, and do not ha~7e to be re~t ~o the origl~al or pra-p~gramm~d value.
The ~low dlagram ~ Figure 5 ~urther illustrates the osclllatlon conerol mQchanlsm descri~sd in Figure 3. Condition A repres~nts the programmed h~ating temp~rature (TH) o~ 7~ and the prQgrammed cooling ten peratu~s (Tc~ ot 76. Conditiol~ B represents the pr~
grammed temperatur~ span of 3~i 2 above the programmed cempe~
atu~ ar~d 1 below. Condi~ions A and B generats condltiorl C
whe~eby th~ h~atin~ system switche~ oll a~ 75 and swlt~h~s oIf at 78Q a~ th~ ~oling s~stem swit~hes orl at 78 and switches o~ at 7~. Thls sibJa~lon will result in the oscillat1On o~ the h~ating and coolin~ sy~te~ns at 78 and ~15 .
Glven ~ondltions A, B, and C a~ st~p 330, a d~ermina~ion is made at step 305 whe~her the heating or coo~ng s~1s~em i~ o~. ~ nei-ther the hea~ing nor cooling system is on, control returns to step 300 and the æquence Is repeated. If the heating system ~ on, control pa~æs to ~tep 310 where a determination is made whether the ambi-ent room temperature is greater ~h~n or equal to 7~. ~ no~, ~ontrol 1 3207~9 - 1~
returns to step 300. 1~ so, control passes to step 315 where both the heating and cooling systems are switched orr. Control then ~7 to step ~720 wh~re the new tem~ratllre span i3 set~ Thus~ th~ sp~n Is adfusted such that the coo~g ~t~!m will SWiltt~h on at 76~7 nr ~
above the coolin~ setpoint, and the h~ann~ system wi~ swlteh OD at ;76-lU, or 1 ~low the heating setpolnt. A~ter ad~ustmerlt or the span~ control pass~ to step 322 where the amb~nt roorn tempera~ure termined. ~ the ternperatu~! is le~7 than or equal to 75, the heating sy~tem is swltched on at ~step 325 and con~rol subsequently returns to step 300. I~ the room temperature ~7 between 75~ and 8û~, cnntrol returns to step 315 and th~ heattD~ and CooliD~ ems are maintain~d in an ~ condition. If the temperature is greater than or ~ual to 80F, the coolln~ syste~a is swltched on at step 330 and con-trol su~s~quently return~ to step 300.
~ lt 15 determined a~ step 305 that the cooling syst~m is on, con~rol passes to step 360 and a determina~lon is made whether th2 ambient temperature Is 1~ than oP equal ta 75F. ~ noe9 control returns to step 300. I~ so, control pa~s~ to step 365 where ~th the ~o~g and heatiA~ ~ystems are swl~ch~ o~. Corl~rol then p~ to step 37D where the new temperature span is set. Thus, ~he span is ad~usted such that ~he heating system will switch OD at 76~-4, or 4 below ~he heatlng se~point, and th~ ~oo~ng system will swi~ch on at 76+2~, or 2 above the cooling setpoin~. After ad~ustmeot OI the span, control pas~ o step 3~2 wh~re the ambien~ room t~mp~rature 3~s determlned. ~ the room temp~rature is less than or equai to 72, the heating system 3s switched on at step 375 arld control 1 3?074q subsequentlg renlrns to step 300. I~ the room tem~er~ture i~ between 72 and ~8, control returns to step 365 and the heating and coo~ng systems are malntaln~d in an o2i ~ndltton. I~ t~ temperature is grea$er tharl or equal to 78~F, the ~ooling s~tem i~ ~wltched on at step 380 and con~rol subsequently re~urns to step ~00.
In ~h~ above descri~d ~xampl~, the pr~ram temperahlres TC
and ~N are the same. Thus, wh n the heati~ sys~em ~wltehæ oY~, ~he ~o~lng system immedtately sw!ltches on. Wtlen the ~oolin~ em swltch~ oi~, th~ h~ating system immediatel~ swltche~ on. The aboY~des~ d concepl: oi span adJustmen~ pr~en~ this ~rom oc~urri~g. However, ~he concept i~ not limited only to sltuatlonx where the programmed heatlng and cooling temperatuPes are equal.
The con~ept is also applicable when ~h~ programmed h~ating and cooling temperatures are close together, ~or e~cample T~=78F and TH=~7F. Wlth ~ programmed span of 3~, 2~ abov@ the s~tpoint tem-peratur~ and 1 b~ow, the ~OOline system wlll switch on at 80F and s~Nitch ~ at 77F while th~ heating sy~te~ ~rlll sw~t~h o~ at ~9F
and sw~t¢h o~ a~ ~6F.
~ th3s e2~ple, when the cool:lng syst~m swi~h~s o~f at 7?F, the heating system does not switch on immediately. Similarly, when th~ heatlng sy~tem switch~s of ~, th~ c~ling syst~in does n~ switch on immed~ately. Elowever, th~ switching on o~ the hea~ing system at 76 and the turning o~ of the cooling system at 7~bF or the switc~ing on o~ ~h~ coo~ng system at 80F and ~he swi~ching of î o~ th0 heating system at 79 d~ create oscillation with only a very smaU tempera-ture d~creas~ or increase respectlv0ly. By using ~h~ abov~described 1 ~207~9 technlque, rapid osc~ation may be prevented. Th~i, when the heat-ing system switches of I at 79F, the coollng s~tem wlll not swtt~h on until 78+4, or 82F. When the cooling system swltches o~ at 77~, the hea~ ystem wlll not swlt~h oa~ until 7~-~, or ~3~F. Ther~
~ore, rap~d os~ation d~S not ~c~.
The present invention also ~ay ~ e~ten~d to a manu~ ove~
~de mods when the thermostat i~; o~erating in a~ automa~d~ m~.
Override re~ers to a u~er~s ab~lty to ~nore the curFent program tem-perature un~il the sub~equent progr~m tlms. Alte~tlv~y, overrlde may b~ designed to last ~or a sp~ci~ic time period sueh as one hour, two hours, etc. I~ the heating p~ram is o~rer~ to such an extent that the overrlde tempsrature ~ o the eurrent program c~ling temperature, cy~ling between heat~ng and ~ling syssems descri~ed above may occur. Thus, wlth re~erenee to program #l o~
Ta~e 1, i~ between 6:00 A.M. and 11:00 A.M., th2 he~ting s~tpoint is overrldden to 78, which is clQse to sr equal to th~ cooling Se'lpO~lt5 it is ~ely that the cooling s~stem will swltch on as s~n æ, or ~oon a~ter, the h~ating eystem switches ~. Sp~ switchlng ~ descrlbed above ~an o~rer~ome ey~ling or os~silla~ion ~n ~hi~ si~atlon~
~ lthough ~t is p~sible to program heating and ~oo~ng setpo~nts which are ~lose to one another, it is no~ possible 9o program heating setpoints higher than ~ooling setpoints or ~ooling setpoints lower than heating see~ints ~or any given program. Whlle a user is entering a program, i~ the he~ting and coo~n~ points are equ~9 as i~ program #~ o~ Table II, the display preferably warns th~ user by nashing the 1 3207~9 program t~mpera~ur~ its to indlcate that ~t is slot p~lble to cræ~;
the set poin~ limits.
A hardwa~e diagram o~ a ~helmostat embodying the preserlt invention appears ln F~ . The ~hermostat Includes a ~Ingle chlp microcomputer hav~ a read only memorg (~OM) ~or soItware and a random a~ce$s memory ~ or data s~ora~e. Th0 compoQent bloclcs bound~ by th~ broken llne ars contai~ed wlthln ml~rocom-put~r 24~. ThermQ~tat ~45 in~ d~s a real time clock geaerator 253 which genesate~ a real tlmR ~mlng ~gnal in th~ pr~nee ~I ~al tlme clock generating e1emerlt 252. The ~lming signal ~enerated by ~ k generator 253 is c~vi~d repeatedly by divider 254 to generate a one ~econd timine slgn~ ~or real time ClQck base 25S. The real tlme clo~k trac~g o~ clock ba~ 255 is necessasy ~or ~he p~raDIming ~soft-ware) ~eatures o~ th~ thermostat. Real time clock base 2SS ~so pro vide~ a signal to d~splay controller 256 whl~h g~nerat~ the t~me oI
~ay dlsplay Ior LCI) 251. Low bateery level det~tor 257 de~er¢~nes when new b~tterle~ are ne~ ~or the thermo~tat aQd provides a ~
nal ~o c~splay ~ont~ r 256 to ~umina~e or ïl~h a low battery pr~mp~ on LCD 251.
Component bo~ 262 is a program control da~a Input whi~h is preterably ke~s on p~grammable therm~stat 2~5. The program data input to thermo~at 245 ria these l~eys is s~ored is~ mamory 2~1. Each second, mlcro~ompu~r 247 compare~ ~he program times ~tored in memory ~6 with the real time to datermine wh~ther new coolln~ or heating setpoint temperatures are required. When the r~al time matcAes a program nme, the ~ontrol tem~ratures corlesponding ~o 1 3207~
that program time ~come the re~erence temperat~ s agalnst whlch the amb~ent temperature sensed by temp~ratur~ sensor 269 is com-pared by comparator 26~ to dete~rm:lne ~hs oper~ting state oî the heatLng/~ooling sgstem. Once the partl~ular on/o~ ~rlterla is reached, an on/o~i swit~hing signalL 1s se~t to oueput controller 271 to swltch ~he approprlate d~vtce via outpu~ on/oig control cir~ 280 and dev1~ sel~tor 281. Con~ Device a~ may lnclude two heater~
~or heatlng, two compressors ~or cooling aod a ~a~ for ventllation.
A.C. power ~s ~;uppli~d to ~ntrol dçwl~s ~ by ~.C. ~w~r source 28.
The invention has been des~ri~d ifl datail ill conne~tion wlth the preierred emb~ments. These embo~m~nts h~wever are merely for ~ample only and tha inven~io~ is not limi~ed thereto. It w~ be easily undsrst~d by those slcilled in ~he art that othe~ varlatior~s an~
mod~ications caQ a~y be made wlthin the sco~ of this invention a~
deiined by th~ appallded
In som~ instances, the programmed heating and cooling tem-peratures may be very close together. Table II illustrate~ such a si~uation.
T~BLE ~ I
Heatln~ Coolin~
Program t~ Tin~eTeaop. Temp.
1 32~74~
6S00 A.M. 76P 75P
2llsOO A.~. 75 76 3~sOO ~.M. 69 73 611:00 P.M. 60 77 The abDv~ sltuation may be created ~dver~ent~y by the user upon program~ng the thermo~at. ` It may a~o occur where a U~8P de~res to ~ontrol the am~lent temp~rature oYer a r~latively narrow range.
As e~ ned ln iur~er detall bBlO~tY9 ~rlth su~h heæ~ arld eoollne program~, it is ~cely that the hea~ng ~d coolln~ ~ystems ~i~
at~.
For e~rample, a6~ation wlll a~ur ii th~ ~emperature span ~s 3F, that Is9 1 below the setpoint ~nd 2~ above the ætpoint as shown in Flgure 2. 1~, between 6:00 A.M. and 11:00 A.~8., the ambient temperat~ ~alls below ?6 to 75, the hea~ wlll swlt~h on and raise the ~emperanlre to 7~ (2 a~ve the hea~ng sst~n~). As soon as the amblent temperatu~ r~ach~s ~8 (2~ above the ~oo3ing se~polnt), the ~oolin~ syst~ wlll swit~h or~ to lower the tempera~ure to 75~ ~1 below ehe ~ooling sstpoint). Howev~r, a~ 75 3 ~ the heatix~ ~y~tem will swl~ch Qn and the systems will cycle ~n~uously.
In a ~lar manner, betwe~ 00 A.Mb ar~d ~:00 P.~q., i~ the ambien1: te~peran~ ralls to ?4 ~ low the heaeing setpoint), ~he h~at will swit~h on and operate u~til ~he ambient tempera~ure reaches 77 (2~ above the heatin~ ~po~t). La~er, when a slight change in ~onditlon~ raises the am~ient tempera~ure by 2 single degree to 78F (~ above cooling setpoin~), the ~ollng system will switch on to lower the ambient tempsrature to 75 (1 below the coolin~ satpoint). However, as soon ~ an addit1Onal 1~ drop o¢curs, the heae will again switch on and the alternating ey~ling b~twe~n systems wlll contlnue thereat~er with only a shor~ ~ime pe~od there~tween.
The present lnven~on preven~s ~his cy~ling ar osclllatlorl by ch~lng the temperature span to a new valu~ ~ust prlor to or any time bs~ore the d~ ~over or alterna~lon to the o~her sy~tem. The new value OI the temperature span at the tL~ of ch21lg~ver is di~-~erent ~ thB Sp~ ~ ly d~d.~l~d Into th~ s~rst0~. C)w~ ths cha~Dver takes pla~ the span re~ to th~ desl~ed span or the new span ~a~ be used permanently Xor ehat program. The new span may ~ g, 5, 6~, et~. wlth equal or unequal t*mpera~ limi~s above and below the ~etpoint tempera~.
Utilizln~ programmed hea~ng and coollng temperatures shown ln Table II ar~ wlth rererence to Flgure 3, betwe~rl 6:00 AoM~
and 11:00 A..M., the heat wlll swlt~h orl at 75 and swltch ~r at 78a, in accordance with the 3 span. However, a~ 7~, th~ coallng system w~ no~ swit~h o~. Ra~her, the 3pan whl~h is currently 3 (2 above ~he setpoint tgmp~t~s, 1~ ~ow) is changed to a new valu~. This nes~r value may b~ preprogramm~d iQto th~ micropr~s~or. Alterna-tive3y9 th~ s~w span may b~ ~alculaeed by a gormula CoDtain0d iDI ~h~!
ml~roprw~or or p~gramm~ externally. The span may ~e chang~d to, ~or e~sampl~, 5F, or ~ above the setpoint and 1 1:~314W. Because o~ this chan~ in ~pan, the ~oolin~ sys~em wlll nog swi9~ch orl at ~8F, but wlll rather ~ ~layed until 8û", ~ abov~ ~he cooling set2oin~ as indl~ated at A. Once the ~hang~over ea~e~ place at 8û'99 the span automatically chang~æ9 back to 3, or 2 a~9Y~ and 1 below. Thus, when the ~ ne sy~tem brings the ambiene tempes ature down ~o 75 g (1 helow th~ ~oollng setpolnt), the cooling system Is swltch~d ott a~
~Ddicat~d ~t B. Again, however, the h~atlng syst~m Wlll n~t swl~ch on immediately. The span prior ~o Iswitchin changes ïrom 3, or 2 a~ove and 1 below, to 6Q, or 2 abovs and 4 ~low, Ior example.
Thus, the heat will not swltc~ on u2lt~1 72, ~IL b~low the h~ating setpDint a~ lndi~ated at D. As b~fore, the sQan is automaticaLly r~;et to ~he pr~programmed value o~ 3''. Thus, the h~at w~ switch ~ at 78F as ladl¢ate~l at F. A~ pr~ously noted, the new span~ may ~
e~feetive throughou~ the program, and do not ha~7e to be re~t ~o the origl~al or pra-p~gramm~d value.
The ~low dlagram ~ Figure 5 ~urther illustrates the osclllatlon conerol mQchanlsm descri~sd in Figure 3. Condition A repres~nts the programmed h~ating temp~rature (TH) o~ 7~ and the prQgrammed cooling ten peratu~s (Tc~ ot 76. Conditiol~ B represents the pr~
grammed temperatur~ span of 3~i 2 above the programmed cempe~
atu~ ar~d 1 below. Condi~ions A and B generats condltiorl C
whe~eby th~ h~atin~ system switche~ oll a~ 75 and swlt~h~s oIf at 78Q a~ th~ ~oling s~stem swit~hes orl at 78 and switches o~ at 7~. Thls sibJa~lon will result in the oscillat1On o~ the h~ating and coolin~ sy~te~ns at 78 and ~15 .
Glven ~ondltions A, B, and C a~ st~p 330, a d~ermina~ion is made at step 305 whe~her the heating or coo~ng s~1s~em i~ o~. ~ nei-ther the hea~ing nor cooling system is on, control returns to step 300 and the æquence Is repeated. If the heating system ~ on, control pa~æs to ~tep 310 where a determination is made whether the ambi-ent room temperature is greater ~h~n or equal to 7~. ~ no~, ~ontrol 1 3207~9 - 1~
returns to step 300. 1~ so, control passes to step 315 where both the heating and cooling systems are switched orr. Control then ~7 to step ~720 wh~re the new tem~ratllre span i3 set~ Thus~ th~ sp~n Is adfusted such that the coo~g ~t~!m will SWiltt~h on at 76~7 nr ~
above the coolin~ setpoint, and the h~ann~ system wi~ swlteh OD at ;76-lU, or 1 ~low the heating setpolnt. A~ter ad~ustmerlt or the span~ control pass~ to step 322 where the amb~nt roorn tempera~ure termined. ~ the ternperatu~! is le~7 than or equal to 75, the heating sy~tem is swltched on at ~step 325 and con~rol subsequently returns to step 300. I~ the room temperature ~7 between 75~ and 8û~, cnntrol returns to step 315 and th~ heattD~ and CooliD~ ems are maintain~d in an ~ condition. If the temperature is greater than or ~ual to 80F, the coolln~ syste~a is swltched on at step 330 and con-trol su~s~quently return~ to step 300.
~ lt 15 determined a~ step 305 that the cooling syst~m is on, con~rol passes to step 360 and a determina~lon is made whether th2 ambient temperature Is 1~ than oP equal ta 75F. ~ noe9 control returns to step 300. I~ so, control pa~s~ to step 365 where ~th the ~o~g and heatiA~ ~ystems are swl~ch~ o~. Corl~rol then p~ to step 37D where the new temperature span is set. Thus, ~he span is ad~usted such that ~he heating system will switch OD at 76~-4, or 4 below ~he heatlng se~point, and th~ ~oo~ng system will swi~ch on at 76+2~, or 2 above the cooling setpoin~. After ad~ustmeot OI the span, control pas~ o step 3~2 wh~re the ambien~ room t~mp~rature 3~s determlned. ~ the room temp~rature is less than or equai to 72, the heating system 3s switched on at step 375 arld control 1 3?074q subsequentlg renlrns to step 300. I~ the room tem~er~ture i~ between 72 and ~8, control returns to step 365 and the heating and coo~ng systems are malntaln~d in an o2i ~ndltton. I~ t~ temperature is grea$er tharl or equal to 78~F, the ~ooling s~tem i~ ~wltched on at step 380 and con~rol subsequently re~urns to step ~00.
In ~h~ above descri~d ~xampl~, the pr~ram temperahlres TC
and ~N are the same. Thus, wh n the heati~ sys~em ~wltehæ oY~, ~he ~o~lng system immedtately sw!ltches on. Wtlen the ~oolin~ em swltch~ oi~, th~ h~ating system immediatel~ swltche~ on. The aboY~des~ d concepl: oi span adJustmen~ pr~en~ this ~rom oc~urri~g. However, ~he concept i~ not limited only to sltuatlonx where the programmed heatlng and cooling temperatuPes are equal.
The con~ept is also applicable when ~h~ programmed h~ating and cooling temperatures are close together, ~or e~cample T~=78F and TH=~7F. Wlth ~ programmed span of 3~, 2~ abov@ the s~tpoint tem-peratur~ and 1 b~ow, the ~OOline system wlll switch on at 80F and s~Nitch ~ at 77F while th~ heating sy~te~ ~rlll sw~t~h o~ at ~9F
and sw~t¢h o~ a~ ~6F.
~ th3s e2~ple, when the cool:lng syst~m swi~h~s o~f at 7?F, the heating system does not switch on immediately. Similarly, when th~ heatlng sy~tem switch~s of ~, th~ c~ling syst~in does n~ switch on immed~ately. Elowever, th~ switching on o~ the hea~ing system at 76 and the turning o~ of the cooling system at 7~bF or the switc~ing on o~ ~h~ coo~ng system at 80F and ~he swi~ching of î o~ th0 heating system at 79 d~ create oscillation with only a very smaU tempera-ture d~creas~ or increase respectlv0ly. By using ~h~ abov~described 1 ~207~9 technlque, rapid osc~ation may be prevented. Th~i, when the heat-ing system switches of I at 79F, the coollng s~tem wlll not swtt~h on until 78+4, or 82F. When the cooling system swltches o~ at 77~, the hea~ ystem wlll not swlt~h oa~ until 7~-~, or ~3~F. Ther~
~ore, rap~d os~ation d~S not ~c~.
The present invention also ~ay ~ e~ten~d to a manu~ ove~
~de mods when the thermostat i~; o~erating in a~ automa~d~ m~.
Override re~ers to a u~er~s ab~lty to ~nore the curFent program tem-perature un~il the sub~equent progr~m tlms. Alte~tlv~y, overrlde may b~ designed to last ~or a sp~ci~ic time period sueh as one hour, two hours, etc. I~ the heating p~ram is o~rer~ to such an extent that the overrlde tempsrature ~ o the eurrent program c~ling temperature, cy~ling between heat~ng and ~ling syssems descri~ed above may occur. Thus, wlth re~erenee to program #l o~
Ta~e 1, i~ between 6:00 A.M. and 11:00 A.M., th2 he~ting s~tpoint is overrldden to 78, which is clQse to sr equal to th~ cooling Se'lpO~lt5 it is ~ely that the cooling s~stem will swltch on as s~n æ, or ~oon a~ter, the h~ating eystem switches ~. Sp~ switchlng ~ descrlbed above ~an o~rer~ome ey~ling or os~silla~ion ~n ~hi~ si~atlon~
~ lthough ~t is p~sible to program heating and ~oo~ng setpo~nts which are ~lose to one another, it is no~ possible 9o program heating setpoints higher than ~ooling setpoints or ~ooling setpoints lower than heating see~ints ~or any given program. Whlle a user is entering a program, i~ the he~ting and coo~n~ points are equ~9 as i~ program #~ o~ Table II, the display preferably warns th~ user by nashing the 1 3207~9 program t~mpera~ur~ its to indlcate that ~t is slot p~lble to cræ~;
the set poin~ limits.
A hardwa~e diagram o~ a ~helmostat embodying the preserlt invention appears ln F~ . The ~hermostat Includes a ~Ingle chlp microcomputer hav~ a read only memorg (~OM) ~or soItware and a random a~ce$s memory ~ or data s~ora~e. Th0 compoQent bloclcs bound~ by th~ broken llne ars contai~ed wlthln ml~rocom-put~r 24~. ThermQ~tat ~45 in~ d~s a real time clock geaerator 253 which genesate~ a real tlmR ~mlng ~gnal in th~ pr~nee ~I ~al tlme clock generating e1emerlt 252. The ~lming signal ~enerated by ~ k generator 253 is c~vi~d repeatedly by divider 254 to generate a one ~econd timine slgn~ ~or real time ClQck base 25S. The real tlme clo~k trac~g o~ clock ba~ 255 is necessasy ~or ~he p~raDIming ~soft-ware) ~eatures o~ th~ thermostat. Real time clock base 2SS ~so pro vide~ a signal to d~splay controller 256 whl~h g~nerat~ the t~me oI
~ay dlsplay Ior LCI) 251. Low bateery level det~tor 257 de~er¢~nes when new b~tterle~ are ne~ ~or the thermo~tat aQd provides a ~
nal ~o c~splay ~ont~ r 256 to ~umina~e or ïl~h a low battery pr~mp~ on LCD 251.
Component bo~ 262 is a program control da~a Input whi~h is preterably ke~s on p~grammable therm~stat 2~5. The program data input to thermo~at 245 ria these l~eys is s~ored is~ mamory 2~1. Each second, mlcro~ompu~r 247 compare~ ~he program times ~tored in memory ~6 with the real time to datermine wh~ther new coolln~ or heating setpoint temperatures are required. When the r~al time matcAes a program nme, the ~ontrol tem~ratures corlesponding ~o 1 3207~
that program time ~come the re~erence temperat~ s agalnst whlch the amb~ent temperature sensed by temp~ratur~ sensor 269 is com-pared by comparator 26~ to dete~rm:lne ~hs oper~ting state oî the heatLng/~ooling sgstem. Once the partl~ular on/o~ ~rlterla is reached, an on/o~i swit~hing signalL 1s se~t to oueput controller 271 to swltch ~he approprlate d~vtce via outpu~ on/oig control cir~ 280 and dev1~ sel~tor 281. Con~ Device a~ may lnclude two heater~
~or heatlng, two compressors ~or cooling aod a ~a~ for ventllation.
A.C. power ~s ~;uppli~d to ~ntrol dçwl~s ~ by ~.C. ~w~r source 28.
The invention has been des~ri~d ifl datail ill conne~tion wlth the preierred emb~ments. These embo~m~nts h~wever are merely for ~ample only and tha inven~io~ is not limi~ed thereto. It w~ be easily undsrst~d by those slcilled in ~he art that othe~ varlatior~s an~
mod~ications caQ a~y be made wlthin the sco~ of this invention a~
deiined by th~ appallded
Claims (34)
1. A programmable thermostat for an air conditioning system having a heating system and a cooling system for controlling the ambient temperature of a predetermined volume of space, said programmable thermostat comprising:
sensor means for sensing the ambient temperature of the predetermined volume of space;
timing means for generating the current time of day;
memory means for storing an operating program including a plurality of program times, a heating and a cooling control temperature corresponding to eachprogram time, a first temperature span associated with the heating control temperatures which first temperature span determines a first temperature for each program time at which said heating system is switched on and a second temperature for each program time at which said heating system is switched off, and a secondtemperature span associated with the cooling control temperatures which second temperature span determines a third temperature for each program time at which said cooling system is switched on and a fourth temperature for each program time at which said cooling system is switched off;
control means for selectively controlling the on/off state of said heating and cooling systems in response to (1) a comparison of the current time of day with the program times stored in said memory means to access the corresponding current heating and cooling control temperatures and their associated first and second temperature spans stored in said memory means and (2) a comparison of the current ambient temperature sensed by said sensor means with the current first, second, third and fourth temperatures to generate a switching control signal for controlling the on/off state of said heating and cooling systems; and adjusting means for adjusting (1) at least the current third temperature prior to switching on said cooling system in response to the switching control signal after said heating system is switched off at the current second temperature or (2) at least the current first temperature prior to switching on said heating system in response to the switching control signal after said cooling system is switched off at the current fourth temperature.
sensor means for sensing the ambient temperature of the predetermined volume of space;
timing means for generating the current time of day;
memory means for storing an operating program including a plurality of program times, a heating and a cooling control temperature corresponding to eachprogram time, a first temperature span associated with the heating control temperatures which first temperature span determines a first temperature for each program time at which said heating system is switched on and a second temperature for each program time at which said heating system is switched off, and a secondtemperature span associated with the cooling control temperatures which second temperature span determines a third temperature for each program time at which said cooling system is switched on and a fourth temperature for each program time at which said cooling system is switched off;
control means for selectively controlling the on/off state of said heating and cooling systems in response to (1) a comparison of the current time of day with the program times stored in said memory means to access the corresponding current heating and cooling control temperatures and their associated first and second temperature spans stored in said memory means and (2) a comparison of the current ambient temperature sensed by said sensor means with the current first, second, third and fourth temperatures to generate a switching control signal for controlling the on/off state of said heating and cooling systems; and adjusting means for adjusting (1) at least the current third temperature prior to switching on said cooling system in response to the switching control signal after said heating system is switched off at the current second temperature or (2) at least the current first temperature prior to switching on said heating system in response to the switching control signal after said cooling system is switched off at the current fourth temperature.
2. The programmable thermostat according to claim 1 wherein said adjusting means adjusts the first temperature at which said heating system is switched on to a first adjusted temperature prior to switching on said heating system after said cooling system is switched off.
3. The programmable thermostat according to claim 1 wherein said adjusting means adjusts the third temperature at which said cooling system is switched on to a third adjusted temperature prior to switching on said cooling system after said heating system is switched off.
4. The programmable thermostat according to claim 1 wherein said adjusting means adjusts the first temperature at which said heating system is switched on to a first adjusted temperature prior to switching on said heating system after said cooling system is switched off and adjusts the third temperature at which said cooling system is switched on to a third adjusted temperature prior to switching on said cooling system after said heating system is switched off.
5. The programmable thermostat according to claim 2 wherein said adjusting means adjusts the first adjusted temperature at which said heating system is switched on to the first temperature if said heating system is switched on at the first adjusted temperature.
6. The programmable thermostat according to claim 3 wherein said adjusting means adjusts the third adjusted temperature at which said cooling system is switched on to the third temperature if said cooling system is switched on at the third adjusted temperature.
7. The programmable thermostat according to claim 4 wherein said adjusting means adjusts the first adjusted temperature at which said heating system is switched on to the first temperature if said heating system is switched on at the first adjusted temperature and adjusts the third adjusted temperature at which said cooling system is switched on to the third temperature if said cooling system is switched on at the third adjusted temperature.
8. The programmable thermostat according to claim 2 wherein the first adjusted temperature is lower than the first temperature.
9. The programmable thermostat according to claim 3 wherein the third adjusted temperature is higher than the third temperature.
10. The programmable thermostat according to claim 4 wherein the first adjustedtemperature is lower than the first temperature and the third adjusted temperature is higher than the third temperature.
11. A method for controlling the operation of an air conditioning system including heating and cooling systems to thereby control the ambient temperature of a predetermined volume of space, the method comprising the steps of:
(a) comparing the current time of day with program times stored in a memory to access corresponding current heating and cooling temperatures stored in said memory, a first temperature span being associated with the heating control temperatures which first temperature span determines a first temperature for each program time at which said heating system is switched on and a second temperature for each program time at which said heating system is switched off and a second temperature span being associated with the cooling control temperatures which second temperature span determines a third temperature for each program time at which said cooling system is switched on and a fourth temperature for each program time at which said cooling system is switched off;
(b) comparing the current ambient temperature in the predetermined volume of space which is sensed by a temperature sensor with the current first, second, third and fourth temperatures;
(c) generating a switching control signal for controlling the on/off state of said heating and cooling systems in response to the comparisons of steps (a) and (b);
and (d) adjusting (1) at least the current third temperature prior to switching on said cooling system in response to the switching control signal after said heating system is switched off at the current second temperature or (2) at least the current first temperature prior to switching on said heating system in response to the switching control signal after said cooling system is switched off at the current fourth temperature.
(a) comparing the current time of day with program times stored in a memory to access corresponding current heating and cooling temperatures stored in said memory, a first temperature span being associated with the heating control temperatures which first temperature span determines a first temperature for each program time at which said heating system is switched on and a second temperature for each program time at which said heating system is switched off and a second temperature span being associated with the cooling control temperatures which second temperature span determines a third temperature for each program time at which said cooling system is switched on and a fourth temperature for each program time at which said cooling system is switched off;
(b) comparing the current ambient temperature in the predetermined volume of space which is sensed by a temperature sensor with the current first, second, third and fourth temperatures;
(c) generating a switching control signal for controlling the on/off state of said heating and cooling systems in response to the comparisons of steps (a) and (b);
and (d) adjusting (1) at least the current third temperature prior to switching on said cooling system in response to the switching control signal after said heating system is switched off at the current second temperature or (2) at least the current first temperature prior to switching on said heating system in response to the switching control signal after said cooling system is switched off at the current fourth temperature.
12. The method according to claim 11 wherein step (d) comprises adjusting the first temperature at which said heating system is switched on to a first adjusted temperature prior to switching on said heating system after said cooling system is switched off.
13. The method according to claim 11 wherein step (d) comprises adjusting the third temperature at which said cooling system is switched on to a third adjusted temperature prior to switching on said cooling system after said heating system is switched off.
14. The method according to claim 11 wherein step (d) comprises adjusting the first temperature at which said heating system is switched on to a first adjusted temperature prior to switching on said heating system after said cooling system is switched off and adjusting the third temperature at which said cooling system is switched on to a third adjusted temperature prior to switching on said cooling system after said heating system is switched off.
15. The method according to claim 12 further comprising the step of:
(e) adjusting the first adjusted temperature at which said heating system is switched on to the first temperature if said heating system is switched on at the first adjusted temperature.
(e) adjusting the first adjusted temperature at which said heating system is switched on to the first temperature if said heating system is switched on at the first adjusted temperature.
16. The method according to claim 13 further comprising the step of:
(e) adjusting the third adjusted temperature at which said cooling system is switched on to the third temperature if said cooling system is switched on at the third adjusted temperature.
(e) adjusting the third adjusted temperature at which said cooling system is switched on to the third temperature if said cooling system is switched on at the third adjusted temperature.
17. The method according to claim 14 further comprising the step of:
(e) adjusting the first adjusted temperature at which said heating system is switched on to the first temperature if said heating system is switched on at the first adjusted temperature; and (f) adjusting the third adjusted temperature at which said cooling system is switched on to the third temperature if said cooling system is switched on at the third adjusted temperature.
(e) adjusting the first adjusted temperature at which said heating system is switched on to the first temperature if said heating system is switched on at the first adjusted temperature; and (f) adjusting the third adjusted temperature at which said cooling system is switched on to the third temperature if said cooling system is switched on at the third adjusted temperature.
18. The method according to claim 12 wherein step (d) comprises adjusting the first temperature at which said heating system is switched on to a first adjusted temperature lower than the first temperature prior to switching on said heating system after said cooling system is switched off.
19. The method according to claim 13 wherein step (d) comprises adjusting the third temperature at which said cooling system is switched on to a third adjusted temperature higher than the third temperature prior to switching on said coolingsystem after said heating system is switched off.
20. The method according to claim 14 wherein step (d) comprises adjusting the first temperature at which said heating system is switched on to a first adjusted temperature lower than the first temperature prior to switching on said heating system after said cooling system is switched off and adjusting the third temperature at which said cooling system is switched on to a third adjusted temperature higher than the third temperature prior to switching on said cooling system after said heating system is switched off.
21. A digital, programmable thermostat for an air conditioning system including a heating system and a cooling system which controls the ambient temperature of a predetermined volume of space, said thermostat comprising:
memory means for storing a heating and a cooling control temperature, a first temperature span associated with the heating control temperature, which first temperature span determines a first temperature at which said heating system is switched on and a second temperature at which said heating system is switched off, and a second temperature span associated with the cooling control temperature, which second temperature span determines a third temperature at which said cooling system is switched on and a fourth temperature at which said cooling system is switched off;
control means for selectively controlling the on/off state of said heating and cooling systems in response to a comparison of the ambient temperature and said first temperature, said second temperature, said third temperature, and said fourth temperature, to generate a switching control signal;
sensor means for sensing the ambient temperature of the predetermined volume of space, and adjusting means for adjusting (1) at least the current third temperature prior to switching on said cooling system in response to the switching control signal after said heating system is switched off at the current second temperature or (2) at least the current first temperature prior to switching on said heating system in response to the switching control signal after said cooling system is switched off at the current fourth temperature.
memory means for storing a heating and a cooling control temperature, a first temperature span associated with the heating control temperature, which first temperature span determines a first temperature at which said heating system is switched on and a second temperature at which said heating system is switched off, and a second temperature span associated with the cooling control temperature, which second temperature span determines a third temperature at which said cooling system is switched on and a fourth temperature at which said cooling system is switched off;
control means for selectively controlling the on/off state of said heating and cooling systems in response to a comparison of the ambient temperature and said first temperature, said second temperature, said third temperature, and said fourth temperature, to generate a switching control signal;
sensor means for sensing the ambient temperature of the predetermined volume of space, and adjusting means for adjusting (1) at least the current third temperature prior to switching on said cooling system in response to the switching control signal after said heating system is switched off at the current second temperature or (2) at least the current first temperature prior to switching on said heating system in response to the switching control signal after said cooling system is switched off at the current fourth temperature.
22. The thermostat according to claim 21 wherein said adjusting means adjusts the first temperature at which said heating system is switched on to a first adjusted temperature prior to switching on said heating system after said cooling system is switched off.
23. The thermostat according to claim 21 wherein said control means adjusts the third temperature at which said cooling system is switched on to a third adjusted temperature prior to switching on said cooling system after said heating system is switched off.
24. The thermostat according to claim 21 wherein said control means adjusts the first temperature at which said heating system is switched on to a first adjusted temperature prior to switching on said heating system after said cooling system is switched off and adjusts the third temperature at which said cooling system is switched on to a third adjusted temperature prior to switching on said cooling system after said heating system is switched off.
25. The programmable thermostat according to claim 22 wherein said control meansadjusts the first adjusted temperature at which said heating system is switched on to the first temperature if said heating system is switched on at the first adjusted temperature.
26. The programmable thermostat according to claim 23 wherein said control meansadjusts the third adjusted temperature at which said cooling system is switched on to the third temperature if said cooling system is switched on at the third adjusted temperature.
27. The programmable thermostat according to claim 24 wherein said control meansadjusts the first adjusted temperature at which said heating system is switched on to the first temperature if said heating system is switched on at the first adjusted temperature and adjusts the third adjusted temperature at which said cooling system is switched on to the third temperature if said cooling system is switched on at the third adjusted temperature.
28. The programmable thermostat according to claim 22 wherein the first adjustedtemperature is lower than the first temperature.
29. The programmable thermostat according to claim 23 wherein the third adjustedtemperature is higher than the third temperature.
30. The programmable thermostat according to claim 24 wherein the first adjustedtemperature is lower than the first temperature and the third adjusted temperature is higher than the third temperature.
31. An air conditioning system for controlling the ambient temperature of a predetermined volume of space and having a heating mode controlled by the on/offswitching of a heating system and a cooling mode controlled by the on/off switching of a cooling system, said air conditioning system comprising:
sensor means for sensing the ambient temperature of the predetermined volume of space;
timing means for generating the current time of day;
memory means for storing an operating program including a plurality of program times, a heating and a cooling control temperature corresponding to eachprogram time, a first temperature span associated with the heating control temperatures which first temperature span determines a first temperature for each program time at which said heating system is switched on and a second temperature for each program time at which said heating system is switched off, and a secondtemperature span associated with the cooling control temperatures which second temperature span determines a third temperature for each program time at which said cooling system is switched on and a fourth temperature for each program time at which said cooling system is switched off;
control means for selectively controlling the on/off state of said heating and cooling systems in response to (1) a comparison of the current time of day with the program times stored in said memory means to access the corresponding current heating and cooling control temperatures stored in said memory means and (2) a comparison of the current ambient temperature sensed by said sensor means with the current first, second, third and fourth temperatures as determined by the current heating and cooling control temperatures and the first and second temperature spans to generate a switching control signal for controlling the on/off state of said heating and cooling systems; and adjusting means for adjusting at least one of the first and second temperature spans in response to the switching control signal prior to an alternation from one of the heating and cooling modes to the other.
sensor means for sensing the ambient temperature of the predetermined volume of space;
timing means for generating the current time of day;
memory means for storing an operating program including a plurality of program times, a heating and a cooling control temperature corresponding to eachprogram time, a first temperature span associated with the heating control temperatures which first temperature span determines a first temperature for each program time at which said heating system is switched on and a second temperature for each program time at which said heating system is switched off, and a secondtemperature span associated with the cooling control temperatures which second temperature span determines a third temperature for each program time at which said cooling system is switched on and a fourth temperature for each program time at which said cooling system is switched off;
control means for selectively controlling the on/off state of said heating and cooling systems in response to (1) a comparison of the current time of day with the program times stored in said memory means to access the corresponding current heating and cooling control temperatures stored in said memory means and (2) a comparison of the current ambient temperature sensed by said sensor means with the current first, second, third and fourth temperatures as determined by the current heating and cooling control temperatures and the first and second temperature spans to generate a switching control signal for controlling the on/off state of said heating and cooling systems; and adjusting means for adjusting at least one of the first and second temperature spans in response to the switching control signal prior to an alternation from one of the heating and cooling modes to the other.
32. The air conditioning system according to claim 31 wherein said alternation control means adjusts the first temperature at which said heating system is switched on to a first adjusted temperature prior to an alternation from the cooling mode to the heating mode.
33. The air conditioning system according to claim 31 wherein said alternation control means adjusts the third temperature at which said cooling system is switched on to a third adjusted temperature prior to an alternation from the heating mode to the cooling mode.
34. The air conditioning system according to claim 31 wherein said alternation control means adjusts the first temperature at which said cooling system is switched on to a first adjusted temperature prior to an alternation from the cooling mode to the heating mode and adjusts the third temperature at which said heating system is switched on to a third adjusted temperature prior to an alternation from the heating mode to the cooling mode.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US256,986 | 1988-10-13 | ||
| US07/256,986 US5038851A (en) | 1988-10-13 | 1988-10-13 | Electronic programmable thermostat for a heating and cooling system with an oscillation control mechanism |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1320749C true CA1320749C (en) | 1993-07-27 |
Family
ID=22974422
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000614940A Expired - Lifetime CA1320749C (en) | 1988-10-13 | 1989-09-29 | Electronic programmable thermostat for a heating and cooling system with an oscillation control mechanism |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US5038851A (en) |
| CA (1) | CA1320749C (en) |
| GB (1) | GB2225654B (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| GB2225654B (en) | 1992-08-12 |
| GB2225654A (en) | 1990-06-06 |
| GB8922262D0 (en) | 1989-11-15 |
| US5038851A (en) | 1991-08-13 |
Similar Documents
| Publication | Publication Date | Title |
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| Date | Code | Title | Description |
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Effective date: 20100727 |