CA1104232A - Fluid control valves - Google Patents
Fluid control valvesInfo
- Publication number
- CA1104232A CA1104232A CA284,863A CA284863A CA1104232A CA 1104232 A CA1104232 A CA 1104232A CA 284863 A CA284863 A CA 284863A CA 1104232 A CA1104232 A CA 1104232A
- Authority
- CA
- Canada
- Prior art keywords
- valve member
- seating
- valve
- injector
- abutment
- 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
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
- F02M65/005—Measuring or detecting injection-valve lift, e.g. to determine injection timing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/20—Closing valves mechanically, e.g. arrangements of springs or weights or permanent magnets; Damping of valve lift
- F02M61/205—Means specially adapted for varying the spring tension or assisting the spring force to close the injection-valve, e.g. with damping of valve lift
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/50—Arrangements of springs for valves used in fuel injectors or fuel injection pumps
- F02M2200/507—Adjusting spring tension by screwing spring seats
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/7722—Line condition change responsive valves
- Y10T137/7781—With separate connected fluid reactor surface
- Y10T137/7835—Valve seating in direction of flow
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/8158—With indicator, register, recorder, alarm or inspection means
- Y10T137/8225—Position or extent of motion indicator
- Y10T137/8242—Electrical
Abstract
ABSTRACT OF DISCLOSURE
A fluid control valve, principally for controlling the flow Or fuel to a compression ignition engine, comprises a valve body and a valve member slidable within the body, the valve member co-operating with a seating on the valve body to control the flow of fluid through the valve. A spring urges the valve member into engagement with the seating and in use, the pressure of the fluid entering the valve is arranged to act on the valve member in opposition to the spring so as to lift the valve member off the seating. The valve member and the seating are formed from electrically conductive material and are electrically insulated from each other except when the valve member is engaged with the seating. An electrical terminal extends to the exterior of the valve body and enables the electrical resistance between the valve member and the seating to be measured. The measured electrical resistance provides an indication of movement of the valve member towards and away from the seating.
A fluid control valve, principally for controlling the flow Or fuel to a compression ignition engine, comprises a valve body and a valve member slidable within the body, the valve member co-operating with a seating on the valve body to control the flow of fluid through the valve. A spring urges the valve member into engagement with the seating and in use, the pressure of the fluid entering the valve is arranged to act on the valve member in opposition to the spring so as to lift the valve member off the seating. The valve member and the seating are formed from electrically conductive material and are electrically insulated from each other except when the valve member is engaged with the seating. An electrical terminal extends to the exterior of the valve body and enables the electrical resistance between the valve member and the seating to be measured. The measured electrical resistance provides an indication of movement of the valve member towards and away from the seating.
Description
~1~4~3Z
This invell~ion -rel~;lteS to f`luid control ~a].ves of the type comprising a val~ra body, a fluid pree~3ure actuat2d valv2 member .sliclably supported in 5he bo-ly~ a .s~ating defined i.n thc body, said val~e memher 'oeing shap~d to co-operate with the seating to prevent flo~ of fluid through the valve and resilient means acting to urge the val~e member into contact with the seating, said valve me~nbcr in u5e ~elng urged against the action of the r~silient means hy ~:I.uid under press~re th~rehy t~ permi.t :~low o~ fluid through tho val~e.
OI1e application for auch a ~alve i.s to control the flo~7 o* fuel to a compression ignition engine and in s~ch ~l application it is sometiJnes important to be able to sense th0 actual inYtant at which the ~al~e member moves into a~d out of contact with its seating. This information is use~ul in order to be able to control the engine performance and also as an aid in diagnosing the condition of the ~uel system.
Such valves may also be usad as non~return ~alves to ens1lro that flow o* flu.id occurs in one direction only in many types of hydraulic and pneu~latic co~trols. ~or example~ ~n many forms of hydraulic transmission such ~alves prevcnt fluid flow which would cause reverse rotation o~, ~or example, an output memberO It is sometimes nec0ssary to be able to dstect wllen the ~al~e operates to pre~e~t the fluid f1QWO There are
This invell~ion -rel~;lteS to f`luid control ~a].ves of the type comprising a val~ra body, a fluid pree~3ure actuat2d valv2 member .sliclably supported in 5he bo-ly~ a .s~ating defined i.n thc body, said val~e memher 'oeing shap~d to co-operate with the seating to prevent flo~ of fluid through the valve and resilient means acting to urge the val~e member into contact with the seating, said valve me~nbcr in u5e ~elng urged against the action of the r~silient means hy ~:I.uid under press~re th~rehy t~ permi.t :~low o~ fluid through tho val~e.
OI1e application for auch a ~alve i.s to control the flo~7 o* fuel to a compression ignition engine and in s~ch ~l application it is sometiJnes important to be able to sense th0 actual inYtant at which the ~al~e member moves into a~d out of contact with its seating. This information is use~ul in order to be able to control the engine performance and also as an aid in diagnosing the condition of the ~uel system.
Such valves may also be usad as non~return ~alves to ens1lro that flow o* flu.id occurs in one direction only in many types of hydraulic and pneu~latic co~trols. ~or example~ ~n many forms of hydraulic transmission such ~alves prevcnt fluid flow which would cause reverse rotation o~, ~or example, an output memberO It is sometimes nec0ssary to be able to dstect wllen the ~al~e operates to pre~e~t the fluid f1QWO There are
2~ of course other examples of application ~or such valves and the two described a~rangemen-ts are by way of example on3.y.
T~ere are ways of detec~ing tha mo~qment of the Yalve mel'lber i.nto and out OI col~tact ~ith the seating. I~ one ~ase ,' , "'~
..
i ~1~423Z
there .is connected to tne valve membar or a part movable t~erewith7 an arma-l;ure w~-lich is included in a magnetlc circui-t al30 includ:ing a sensing coi.l. A signnl is generated in the coil when movement of the armahlre talces place. The woight of the armature adds to the inertia of tlle moving parts of th~
valve so t~a~ it adveraely inPluence3 thD opening and clos.ing speeds of the valvo melllber. Whils~ i-t is possible to utili~
an existing part of the valve as the armature thore are physical constralnts oP the valve constr~ction which limlt 1~ the si~e of the electrical compo.nants. It is al~o known to make use of the variation of capacitance o* a capacitor one plate o~ which i~ co.~stituted by moving part of the valve.
Again the problen is the spac~ within the valve The object of the pre~ent inve~tlon is to provide a fluid valve of the kind specified in a form in ~hich sensin~ o* ths movement of th~ valve member towards and awav from -the seating when the valve is i~ use, is facilitated.
According to another aspect of the invention in a valve of tho kind specifl.ed, the valve member and seatin~ are formed from electrically conductive material, the valve further including electrically insulated ter~inal means on said body, means within the body connecting said terminal means to the valve membes, and further means acting to electrically in~ulate the Yalve member from the body except through the ~eating whereby th~ electric~l resistanc~ between the valve m0mber and the body can be monitored whilst the ~alve is in use thereby to provide an indication of when the valYe :nember is lifted from or moves into contact with tha seating.
,_.
,.' . ', , " , ', ~ ' " ' ' ' ' ' ' . ' " ~ , ~ ", ' ' ' " , ' ' ' . .
~1~423Z
One example of a val~e in acoo~dance wit,h tile inv~ntion wlll now be described Wi t}l re~`erence to the accotl1p~n~ing dra~tings as applied to a fuel injector for supp~ying :Liquid f`uol to an int~rnal combustion eng.ine, In the drawings~-.
~igare 1 19 a sectioIlal s:ide elevut:ion o~ th~ inj0ctor;
Figure 2 is an enlarged view of a portion oP th~ injector seen in ~igure 1;
Fig~lre 3 is an oscillogram show:;ng resîstance variation;
1 0 ~TId Figure 4 is all electric~l ^ircui.t diagram, l~eferr:ing to ~ ure 1 of the dra~ings~ the *u~l injector comprises a main bvdy 10 which is o~ generally cylindrica1 form and which has a lateral extension 11 having a threadcd aperturo formQd therein which in use~ recei~res a pipe union 12 which constitute~ the fuel inlat for the injector.
.At one end th~ro is secured to the main body 10, a valve ~-bod~ 139 this being of stepped cylindrical ~orm. The narrower end portion of the val~e body projects~ in u9e 9 through the wall of a co~bustion space of an engine, .lnd the valve body i~ retained relative tv the main body by a cup-shaped retaining m~mber 1~ havlng an aperture in its basc wall through which the narrower portion of the valve body extends~
Formed within tho valve body 13 is a bore 15, The bore 2~ l~ e}~;tends to ad3acent the end of the narrower portion of the body ~ld defines a seating for a valv3 member 16 which is slidahle withi~ the bore~ The valve me~be~ is shaped to co-operate with tha seating to prevent flow oY fuel through ., .,~ ~ . - . . . -- - .
.: . .
-&~
outlet orlf.Lces whj.ch comll:unicatc wi~h tho blind ~nd o~ the bore. ~he valve member 16 is of.` S'G~pp~d form, the narrower portiosl n-f the ~al~e member lying generc.]ly within the portion o~ tha bore 15 which is formed ln the narro~Yer por1;ion of tha valve body. There .is de~ined between the valve rrlember and the bore a clearance which i3 co~ected by co~op~ra~ing passages 17, 18 in the valre body and the main body respectively with the a-~orementi.oned fuel inlet. As i5 we3.1 known, during manufacture9 the valve member arld the bore 15 are .I.apped and a very srnall clearance ax:ist,s b~-ltween the lapped sl~r~acQs of the wall of the bore and the valve member9 this clearc~nc~
being occupied by a ~ilm o~ fuel. Th~ v~lve m0rnber is also lapped with the seatin~ but when the valve member is in the closed po~ition metal-to-metal contact is established between the ~alvc member a~d the val~e body throuph th~ seating.
Formed in the main body 10 is a furthsr axiall~ ex~,ending bore which accommodates a push--rod 19. The push-rod is engaged with an axial projection (not sho~) on the valv~
member 16 ~ld at its other end opens into a.n enlarged chamber 20. The end of the push rod in the chamber is pro~r~ded with an abutment 21 for resilient means in the form of a coiled compression spring 22. The other end of the coiled compression : spring is engaged about a further abutment 23 which -n turn engages a cup-shaped member 24 which i9 in screw-thread engagement with the wall of the chamber 20. The c~p-shaped member 24 ls prevented from rotatiilg in the main body by a locknut and an aperture 29 is pro~rided in the member 2~ to allow *uel t~o leak from the chamber 20.
.
;...
..
, 11~4232 II1 operat:ion9 ~h~n I~lel unc1er presswre i.:3 a~itted to the clearance defined betws*n the valve member and the bore 15, t'ne val~e member is mo~e~l agalnst the ac-tion of the coiled compression spring to pe-rmit ~uel flow through the aforesaid outlets and when the supply of fuel ~nd~r press~re ceases the valve melnber is returned into contact with :it~ seating by the action of` the coiled compression spring. Any ~ el which leak~
past th~ lapp~d sur~aces can flow into the c~amber 20 and the ~uel accumulat:;ng in the chamber 20 can *low throu~h the aperture 2~ to a drain, In order to provide an indication of the moveme1lt o~` the Yalve member towards and away from the seating~ use is made o~ the variation in the electrical resistance which occurs during such movement, betweerl the valve member 16 and the 1~ val~e body 13. The val~e body is o~ course electricall.y conn0cted to the main bo~y 10 and the valve memb~r is connected to terminal means through the push-rod 19, th0 spring 22 and the abutment 23. The push-rod 19 is spaced from the wall of the bore in ~i.ch it is mounted as also is the ab1ltment 21 ~nd Z the spring 22. The abutmer~t 23 as shown in ~igure 2 is insulated from the cup-shaped member 24 by means of an electrically insulating disc 28 so that the only direct electrical connection between the valve member and the valve body occurs when the valvs member is in contact Wit~l ths sea~ing. In this respect it should be noted that the ~ilm of fuel within the small clearance between the valve member and the ~-ral.l o* the bore 15 acts to electrically in~ulate the valYe member from ths valve body. It will o~ course be -- S --.
.
appreciated that the degraa of insul~tion offered by the film of fue:L or other f'ltl:id depen~ls upon 3. number of factors~
e,g. the conductiv:ity of` the *lu-ld~ the thickness of the film and the a:rea of the film. The te t`tn illSUlate used herein is therefore in a sen~e a relative term because whc~ the valv~
member i5 out of contact with the seating there wlll be a resistance value but this will bc much higher than whon metal contact exis1;s betw0en the valve member and the seating.
The abutment 23 has secured thereto an electrical conductor 27 ~-~hich pas es through an lnsulating collar 25 located withi~ an aperture in the base wall of the cup~shaped member and is connected to an electrlcal connector 26.
The electric~l resistance offered by the unit is measured between the electrical terminal 26 and the valve 1S body 10 and ths oscillogram shown in ~igure 3 represe~ts the ,~
var;ation in resistance which is obtained upon movement of ths valve member a~ay from its sea-ting. As will be seen from Figure 3 there is a substantial variation in the resistance when the valve member is moved by the action of fuel under pressure and thi~ variation occurs very quickly. Whilst the val~e member is in the open position the resis-tance remains substantially con~tant and is determined by the resistance of the fuel film between the valve member and the wall of the bore 15. As will be seen from Figure 3 the resistance graduall~ Palls as the valve member moves into contact with the seating as the delivery of fuel from the pump is terminated.
The signal ~ ich can be obtained because of its ini-tial short rise time offers a very precise indication of the opening . y .,.. ~, - , , - ~
.
232:
o~ the val.ve ~lenll02r. Compa-rod w:;tn ~he el~ctric~l c.i.~-,uits ~hich need to lje associateclsJ:ith the arrangen~ents descrlbad earlie:r to enable thi~ signal. to be obta.in?~, the ci~cuit ~/hich i~ used with th~ p.resent ar.rar.gc?ment is simpl)3 in natur~, One circuit is 9eOIl in Fi.gure 4 and it will b~3 seen that the el.ectrical ci.rcu.i-t o~ the injecto.r at 32, is cor~ected in serios with a resistor 30 and a sourcc of ~16ctric suE)ply 31. An ind.ica-tin~ i.ns-tru~lert, for e~atnpl.e an oscillo~cope 33 ls connectecl iIl parallcl with the lnjector9 -t~e re~istor being provi~ed to lin~it the curr?nt ~low w.h.~?ll the valve membs.r i~ in the closed po~-i-tion. It w.ill be ~pp-~ecia-ted that -the electrical circ~it of the .injector i.s the equ:i~alent of a switch.
T~ere are ways of detec~ing tha mo~qment of the Yalve mel'lber i.nto and out OI col~tact ~ith the seating. I~ one ~ase ,' , "'~
..
i ~1~423Z
there .is connected to tne valve membar or a part movable t~erewith7 an arma-l;ure w~-lich is included in a magnetlc circui-t al30 includ:ing a sensing coi.l. A signnl is generated in the coil when movement of the armahlre talces place. The woight of the armature adds to the inertia of tlle moving parts of th~
valve so t~a~ it adveraely inPluence3 thD opening and clos.ing speeds of the valvo melllber. Whils~ i-t is possible to utili~
an existing part of the valve as the armature thore are physical constralnts oP the valve constr~ction which limlt 1~ the si~e of the electrical compo.nants. It is al~o known to make use of the variation of capacitance o* a capacitor one plate o~ which i~ co.~stituted by moving part of the valve.
Again the problen is the spac~ within the valve The object of the pre~ent inve~tlon is to provide a fluid valve of the kind specified in a form in ~hich sensin~ o* ths movement of th~ valve member towards and awav from -the seating when the valve is i~ use, is facilitated.
According to another aspect of the invention in a valve of tho kind specifl.ed, the valve member and seatin~ are formed from electrically conductive material, the valve further including electrically insulated ter~inal means on said body, means within the body connecting said terminal means to the valve membes, and further means acting to electrically in~ulate the Yalve member from the body except through the ~eating whereby th~ electric~l resistanc~ between the valve m0mber and the body can be monitored whilst the ~alve is in use thereby to provide an indication of when the valYe :nember is lifted from or moves into contact with tha seating.
,_.
,.' . ', , " , ', ~ ' " ' ' ' ' ' ' . ' " ~ , ~ ", ' ' ' " , ' ' ' . .
~1~423Z
One example of a val~e in acoo~dance wit,h tile inv~ntion wlll now be described Wi t}l re~`erence to the accotl1p~n~ing dra~tings as applied to a fuel injector for supp~ying :Liquid f`uol to an int~rnal combustion eng.ine, In the drawings~-.
~igare 1 19 a sectioIlal s:ide elevut:ion o~ th~ inj0ctor;
Figure 2 is an enlarged view of a portion oP th~ injector seen in ~igure 1;
Fig~lre 3 is an oscillogram show:;ng resîstance variation;
1 0 ~TId Figure 4 is all electric~l ^ircui.t diagram, l~eferr:ing to ~ ure 1 of the dra~ings~ the *u~l injector comprises a main bvdy 10 which is o~ generally cylindrica1 form and which has a lateral extension 11 having a threadcd aperturo formQd therein which in use~ recei~res a pipe union 12 which constitute~ the fuel inlat for the injector.
.At one end th~ro is secured to the main body 10, a valve ~-bod~ 139 this being of stepped cylindrical ~orm. The narrower end portion of the val~e body projects~ in u9e 9 through the wall of a co~bustion space of an engine, .lnd the valve body i~ retained relative tv the main body by a cup-shaped retaining m~mber 1~ havlng an aperture in its basc wall through which the narrower portion of the valve body extends~
Formed within tho valve body 13 is a bore 15, The bore 2~ l~ e}~;tends to ad3acent the end of the narrower portion of the body ~ld defines a seating for a valv3 member 16 which is slidahle withi~ the bore~ The valve me~be~ is shaped to co-operate with tha seating to prevent flow oY fuel through ., .,~ ~ . - . . . -- - .
.: . .
-&~
outlet orlf.Lces whj.ch comll:unicatc wi~h tho blind ~nd o~ the bore. ~he valve member 16 is of.` S'G~pp~d form, the narrower portiosl n-f the ~al~e member lying generc.]ly within the portion o~ tha bore 15 which is formed ln the narro~Yer por1;ion of tha valve body. There .is de~ined between the valve rrlember and the bore a clearance which i3 co~ected by co~op~ra~ing passages 17, 18 in the valre body and the main body respectively with the a-~orementi.oned fuel inlet. As i5 we3.1 known, during manufacture9 the valve member arld the bore 15 are .I.apped and a very srnall clearance ax:ist,s b~-ltween the lapped sl~r~acQs of the wall of the bore and the valve member9 this clearc~nc~
being occupied by a ~ilm o~ fuel. Th~ v~lve m0rnber is also lapped with the seatin~ but when the valve member is in the closed po~ition metal-to-metal contact is established between the ~alvc member a~d the val~e body throuph th~ seating.
Formed in the main body 10 is a furthsr axiall~ ex~,ending bore which accommodates a push--rod 19. The push-rod is engaged with an axial projection (not sho~) on the valv~
member 16 ~ld at its other end opens into a.n enlarged chamber 20. The end of the push rod in the chamber is pro~r~ded with an abutment 21 for resilient means in the form of a coiled compression spring 22. The other end of the coiled compression : spring is engaged about a further abutment 23 which -n turn engages a cup-shaped member 24 which i9 in screw-thread engagement with the wall of the chamber 20. The c~p-shaped member 24 ls prevented from rotatiilg in the main body by a locknut and an aperture 29 is pro~rided in the member 2~ to allow *uel t~o leak from the chamber 20.
.
;...
..
, 11~4232 II1 operat:ion9 ~h~n I~lel unc1er presswre i.:3 a~itted to the clearance defined betws*n the valve member and the bore 15, t'ne val~e member is mo~e~l agalnst the ac-tion of the coiled compression spring to pe-rmit ~uel flow through the aforesaid outlets and when the supply of fuel ~nd~r press~re ceases the valve melnber is returned into contact with :it~ seating by the action of` the coiled compression spring. Any ~ el which leak~
past th~ lapp~d sur~aces can flow into the c~amber 20 and the ~uel accumulat:;ng in the chamber 20 can *low throu~h the aperture 2~ to a drain, In order to provide an indication of the moveme1lt o~` the Yalve member towards and away from the seating~ use is made o~ the variation in the electrical resistance which occurs during such movement, betweerl the valve member 16 and the 1~ val~e body 13. The val~e body is o~ course electricall.y conn0cted to the main bo~y 10 and the valve memb~r is connected to terminal means through the push-rod 19, th0 spring 22 and the abutment 23. The push-rod 19 is spaced from the wall of the bore in ~i.ch it is mounted as also is the ab1ltment 21 ~nd Z the spring 22. The abutmer~t 23 as shown in ~igure 2 is insulated from the cup-shaped member 24 by means of an electrically insulating disc 28 so that the only direct electrical connection between the valve member and the valve body occurs when the valvs member is in contact Wit~l ths sea~ing. In this respect it should be noted that the ~ilm of fuel within the small clearance between the valve member and the ~-ral.l o* the bore 15 acts to electrically in~ulate the valYe member from ths valve body. It will o~ course be -- S --.
.
appreciated that the degraa of insul~tion offered by the film of fue:L or other f'ltl:id depen~ls upon 3. number of factors~
e,g. the conductiv:ity of` the *lu-ld~ the thickness of the film and the a:rea of the film. The te t`tn illSUlate used herein is therefore in a sen~e a relative term because whc~ the valv~
member i5 out of contact with the seating there wlll be a resistance value but this will bc much higher than whon metal contact exis1;s betw0en the valve member and the seating.
The abutment 23 has secured thereto an electrical conductor 27 ~-~hich pas es through an lnsulating collar 25 located withi~ an aperture in the base wall of the cup~shaped member and is connected to an electrlcal connector 26.
The electric~l resistance offered by the unit is measured between the electrical terminal 26 and the valve 1S body 10 and ths oscillogram shown in ~igure 3 represe~ts the ,~
var;ation in resistance which is obtained upon movement of ths valve member a~ay from its sea-ting. As will be seen from Figure 3 there is a substantial variation in the resistance when the valve member is moved by the action of fuel under pressure and thi~ variation occurs very quickly. Whilst the val~e member is in the open position the resis-tance remains substantially con~tant and is determined by the resistance of the fuel film between the valve member and the wall of the bore 15. As will be seen from Figure 3 the resistance graduall~ Palls as the valve member moves into contact with the seating as the delivery of fuel from the pump is terminated.
The signal ~ ich can be obtained because of its ini-tial short rise time offers a very precise indication of the opening . y .,.. ~, - , , - ~
.
232:
o~ the val.ve ~lenll02r. Compa-rod w:;tn ~he el~ctric~l c.i.~-,uits ~hich need to lje associateclsJ:ith the arrangen~ents descrlbad earlie:r to enable thi~ signal. to be obta.in?~, the ci~cuit ~/hich i~ used with th~ p.resent ar.rar.gc?ment is simpl)3 in natur~, One circuit is 9eOIl in Fi.gure 4 and it will b~3 seen that the el.ectrical ci.rcu.i-t o~ the injecto.r at 32, is cor~ected in serios with a resistor 30 and a sourcc of ~16ctric suE)ply 31. An ind.ica-tin~ i.ns-tru~lert, for e~atnpl.e an oscillo~cope 33 ls connectecl iIl parallcl with the lnjector9 -t~e re~istor being provi~ed to lin~it the curr?nt ~low w.h.~?ll the valve membs.r i~ in the closed po~-i-tion. It w.ill be ~pp-~ecia-ted that -the electrical circ~it of the .injector i.s the equ:i~alent of a switch.
Claims (9)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A fuel injector comprising an injector body with a bore defined by a wall of said body, a fluid pressure actuated valve member slidably supported in the bore by said wall, a seating defined in the body, said valve member being shaped to co-operate with the seating to prevent flow of fluid through the injector, the valve member and seating being formed from electrically conductive material, resilient means acting to urge the valve member into contact with the seating, said valve member in use, being lifted from said seating against the action of the resilient means by fluid under pressure to permit flow of fluid through the injector, electrically insulated terminal means on said body, means within the body connecting said terminal means to the valve member, and a film of the fluid in the injector being the sole means for electrically insulating the valve member from the wall of the bore and from the body when said valve member is lifted from the seating, whereby the electrical resistance between the valve member and the body can be monitored whilst the injector is in use thereby to provide an indication of when the valve member is lifted from or moved into contact with the seating.
2. An injector according to claim 1, in which the means within the body connecting the terminal means to the valve member includes a coiled spring which forms said resilient means.
3. An injector according to claim 2, including an abutment engaging one end of said spring, and an electrically insulating washer, disposed between said abutment and a body part, said abutment being electrically connected to said terminal means.
4. An injector according to claim 3, including a further spring abutment engaging the other end of said spring and a rod mechanically and electrically coupling said further abutment to the valve member.
5. An injector according to claim 1, said injector body including a main body and a valve body retained relative to the main body, a bore in said main body opening into a chamber which accommodates a coiled spring forming said resilient means, a rod connecting said spring to the valve member, said rod being insulated from the main body, an end closure for the chamber, said end closure mounting said terminal means, a spring abutment interposed between the spring and said end closure, a washer acting to insulate said abutment from the end closure, and connecting means connecting said abutment with said terminal means, said rod, spring, abutment and connecting means acting as the means for connecting the valve member to the terminal means.
6. An injector according to claim 5, including passage means in said valve body and main body through which fluid under pressure can flow to act on the valve member to lift the valve member from the seating.
7. An injector according to claim 6, including an outlet for fluid, said outlet being brought into communication with said passage means when the valve member is moved away from the seating.
8. An injector according to claim 7, in which said passage means communicates with a liquid fuel inlet in the main body, said liquid fuel forming a film between the valve member and the wall of a bore in which the valve member is mounted to insulate the valve member from the wall of the bore.
9. An injector according to claim 8, including an aperture opening into said chamber to allow liquid fuel to escape therefrom.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB26010/77A GB1586254A (en) | 1977-06-22 | 1977-06-22 | Fuel injection nozzle unit for supplying fuel to an internal combustion engine |
| GB26010/77 | 1977-06-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1104232A true CA1104232A (en) | 1981-06-30 |
Family
ID=10236932
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA284,863A Expired CA1104232A (en) | 1977-06-22 | 1977-08-17 | Fluid control valves |
Country Status (15)
| Country | Link |
|---|---|
| US (1) | US4183467A (en) |
| JP (1) | JPS5417525A (en) |
| AR (1) | AR212727A1 (en) |
| AU (1) | AU513678B2 (en) |
| BR (1) | BR7705793A (en) |
| CA (1) | CA1104232A (en) |
| DD (1) | DD132145A5 (en) |
| DE (1) | DE2739628A1 (en) |
| ES (1) | ES462130A1 (en) |
| FR (1) | FR2395440A1 (en) |
| GB (1) | GB1586254A (en) |
| IN (1) | IN147413B (en) |
| IT (1) | IT1086139B (en) |
| PL (1) | PL119131B1 (en) |
| ZA (1) | ZA774951B (en) |
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| GB2051230B (en) * | 1979-06-15 | 1983-03-23 | Texaco Development Corp | Ignition system for an internal combustion engine employing fuel injection |
| DE2925187A1 (en) * | 1979-06-22 | 1981-01-08 | Bosch Gmbh Robert | FUEL INJECTION NOZZLE FOR INTERNAL COMBUSTION ENGINES |
| JPS56113044A (en) * | 1980-02-13 | 1981-09-05 | Nissan Motor Co Ltd | Injection timing sensor |
| US4341241A (en) * | 1980-10-20 | 1982-07-27 | Brunswick Corporation | Position indicating valve means |
| US4993456A (en) * | 1982-03-02 | 1991-02-19 | Akos Sule | Pinch valve assembly |
| FR2526483A1 (en) * | 1982-05-06 | 1983-11-10 | Gurtner Sa | Oil injection monitor for separately lubricated two-stroke engine - uses sprung ball contact in supply line to passivate timing circuit in gate of semiconductor switch |
| GB2125894B (en) * | 1982-08-26 | 1986-09-17 | Lucas Ind Plc | I.c. engine fuel injection nozzle |
| US4662564A (en) * | 1984-05-15 | 1987-05-05 | Diesel Kiki Co., Ltd. | Fuel injection nozzle with timing sensor |
| DE3443393A1 (en) * | 1984-11-28 | 1986-05-28 | Voest-Alpine Friedmann GmbH, Linz | Valve, especially for exhaust gas recirculation etc. in internal- combustion engines |
| US4821769A (en) * | 1986-11-12 | 1989-04-18 | Cd Medical Inc. | Valve monitor and method |
| EP0387179A3 (en) * | 1989-03-07 | 1991-01-02 | Karl Holm | An atomizing nozzle device and an inhaler |
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| DE19649812A1 (en) * | 1996-12-02 | 1998-06-04 | Bosch Gmbh Robert | Fuel injection valve for internal combustion engines |
| DE19650781A1 (en) * | 1996-12-06 | 1998-06-10 | Itw Oberflaechentechnik Gmbh | Spray coating device |
| DE19652719A1 (en) * | 1996-12-18 | 1998-06-25 | Daimler Benz Ag | Device for determining the opening and closing times of a valve |
| US5895844A (en) * | 1997-05-29 | 1999-04-20 | Outboard Marine Corporation | Precise fuel flow measurement with modified fluid control valve |
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| US10179696B2 (en) | 2015-01-27 | 2019-01-15 | Novatec, Inc. | Variable opening slide gate for regulating material flow into airstream |
| US10138076B2 (en) | 2015-02-25 | 2018-11-27 | Stephen B. Maguire | Method for resin delivery including metering introduction of external air to maintain desired vacuum level |
| GB2554916B (en) * | 2016-10-14 | 2020-01-29 | Delphi Automotive Systems Lux | Method and apparatus to detect impedance of contact between injector valve moving parts |
| GB2565316A (en) * | 2017-08-10 | 2019-02-13 | Delphi Int Operations Luxembourg Sarl | Circuit arrangement for fuel injector switch |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2434151A (en) * | 1941-05-19 | 1948-01-06 | Edwin M Fisk | Fuel injection nozzle |
| GB729431A (en) * | 1951-09-25 | 1955-05-04 | Leslie Hartridge | Apparatus and devices for testing fuel injection pumps and nozzles for internal combustion compression ignition engines |
| US2960973A (en) * | 1958-04-07 | 1960-11-22 | Texaco Inc | Fuel ignition system |
| US3124305A (en) * | 1961-06-12 | 1964-03-10 | Fuel injection nozzle units | |
| SU182356A1 (en) * | 1964-06-11 | 1966-07-13 | М. Г. Сандомирский | METHOD FOR DETERMINING THE BEGINNING OF OPENING A VALVE |
| DE2305114A1 (en) * | 1973-02-02 | 1974-08-08 | Bosch Gmbh Robert | FUEL INJECTION NOZZLE FOR COMBUSTION MACHINES |
| GB1449563A (en) * | 1974-02-28 | 1976-09-15 | Clarke Chapman Ltd | Atomisers |
| US3890995A (en) * | 1974-05-01 | 1975-06-24 | Deere & Co | Flow-sensing switch for backup steering system |
| US4066059A (en) * | 1976-01-02 | 1978-01-03 | Texaco Inc. | Fuel injection nozzle valve and ignition system |
-
1977
- 1977-06-22 GB GB26010/77A patent/GB1586254A/en not_active Expired
- 1977-08-16 ZA ZA00774951A patent/ZA774951B/en unknown
- 1977-08-17 CA CA284,863A patent/CA1104232A/en not_active Expired
- 1977-08-17 US US05/825,417 patent/US4183467A/en not_active Expired - Lifetime
- 1977-08-20 IN IN1301/CAL/77A patent/IN147413B/en unknown
- 1977-08-23 AU AU28137/77A patent/AU513678B2/en not_active Expired
- 1977-08-29 IT IT27043/77A patent/IT1086139B/en active
- 1977-08-31 BR BR7705793A patent/BR7705793A/en unknown
- 1977-09-02 DE DE19772739628 patent/DE2739628A1/en not_active Withdrawn
- 1977-09-05 ES ES462130A patent/ES462130A1/en not_active Expired
- 1977-09-05 DD DD7700200894A patent/DD132145A5/en unknown
- 1977-09-05 AR AR269103A patent/AR212727A1/en active
- 1977-09-26 PL PL1977201048A patent/PL119131B1/en unknown
- 1977-10-14 JP JP12341777A patent/JPS5417525A/en active Pending
- 1977-11-09 FR FR7733731A patent/FR2395440A1/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| PL119131B1 (en) | 1981-11-30 |
| ES462130A1 (en) | 1978-06-01 |
| AU2813777A (en) | 1979-03-01 |
| PL201048A1 (en) | 1979-03-26 |
| BR7705793A (en) | 1979-03-27 |
| JPS5417525A (en) | 1979-02-08 |
| DE2739628A1 (en) | 1979-01-11 |
| AU513678B2 (en) | 1980-12-18 |
| ZA774951B (en) | 1978-09-27 |
| IT1086139B (en) | 1985-05-28 |
| DD132145A5 (en) | 1978-08-30 |
| AR212727A1 (en) | 1978-09-15 |
| US4183467A (en) | 1980-01-15 |
| FR2395440A1 (en) | 1979-01-19 |
| FR2395440B1 (en) | 1980-08-22 |
| IN147413B (en) | 1980-02-23 |
| GB1586254A (en) | 1981-03-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |