WO2001051214A1 - Filter-fan product including a circuit for monitoring the filter thereof - Google Patents
Filter-fan product including a circuit for monitoring the filter thereof Download PDFInfo
- Publication number
- WO2001051214A1 WO2001051214A1 PCT/US2001/001269 US0101269W WO0151214A1 WO 2001051214 A1 WO2001051214 A1 WO 2001051214A1 US 0101269 W US0101269 W US 0101269W WO 0151214 A1 WO0151214 A1 WO 0151214A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- fan
- filter
- microprocessor
- counter value
- circuit
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/0084—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours provided with safety means
- B01D46/0086—Filter condition indicators
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/10—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/42—Auxiliary equipment or operation thereof
- B01D46/44—Auxiliary equipment or operation thereof controlling filtration
- B01D46/46—Auxiliary equipment or operation thereof controlling filtration automatic
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/56—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition
- B01D46/58—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition connected in parallel
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/56—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition
- B01D46/62—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition connected in series
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/70—Suction grids; Strainers; Dust separation; Cleaning
- F04D29/701—Suction grids; Strainers; Dust separation; Cleaning especially adapted for elastic fluid pumps
- F04D29/703—Suction grids; Strainers; Dust separation; Cleaning especially adapted for elastic fluid pumps specially for fans, e.g. fan guards
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2273/00—Operation of filters specially adapted for separating dispersed particles from gases or vapours
- B01D2273/30—Means for generating a circulation of a fluid in a filtration system, e.g. using a pump or a fan
Definitions
- FILTER-FAN PRODUCT INCLUDING A CIRCUIT FOR MONITORING THE FILTER THEREOF
- the present invention relates generally to filter-fan products including a filter monitoring system and more particularly relates to a filter monitoring system using a counter that works in conjunction with the fan motor speed.
- the system will provide a display for remaining filter life for filter-fan products.
- Filter- fan products such as some types of portable fans, air purifiers, humidifiers and dehumidifiers include filters for removing airborne particles from the homes or offices in which they operate.
- filters include fine particle high efficiency particulate air (HEP A) filters, filters for trapping relatively large particles and carbon filters to remove odors.
- HEP A fine particle high efficiency particulate air
- a fan is positioned adjacent a removable filter to force air through the filter thereby trapping airborne particles therein.
- the ability to easily determine when the filter is spent is important.
- the filter is typically replaced only when a visual inspection reveals a spent filter.
- this requires periodic inspection and by the time a filter shows signs of needing replacement, its efficiency has already been drastically reduced.
- Another option for maintaining the efficiency of the filter- fan product is to follow the manufacturer ' s filter replacement schedule. However, this requires the user to somehow keep track of the filter-fan product's use. Neither of these options are particularly convenient for the user of the filter-fan product.
- the present invention is a method and circuit for monitoring the useful life of a filter for a filter-fan product.
- the method according to the present invention generally includes the steps of detecting use of a fan of the filter- fan product with a microprocessor, counting from a predetermined initial counter value a duration of usage of the fan with a counter of the microprocessor to determine a present counter value, calculating by the microprocessor a percentage of filter life remaining based on the present counter value, sending a signal representing the percentage of filter life remaining from the microprocessor to a display and displaying the remaining useful life of the filter based on the signal received from the micro processor.
- use of the fan is detected by detecting a position of a fan speed switch such that the microprocessor detects the speed of the fan and adjusts the rate of counting by the counter based on the detected speed of the fan.
- the method further preferably includes the steps of storing the present counter value in a memory device upon termination of fan use, retrieving the stored present counter value from the memory device upon reactivation of the fan and resetting the present counter value to the predetermined initial counter value upon replacement of the filter.
- the remaining useful life of the filter is preferably displayed by illuminating one of a plurality of light emitting devices, each light emitting device representing a level of remaining useful life of the filter.
- the circuit according to the present invention generally includes a microprocessor electrically connected to a power circuit for a fan assembly of the filter-fan product for detecting use of the fan and a display electrically connected to the microprocessor for displaying the remaining useful life of the filter.
- the microprocessor includes a counter, having a predetermined initial counter value, and an algorithm. The counter counts from the predetermined initial counter value a duration of usage of the fan to determine a present counter value and the algorithm calculates a percentage of filter life remaining based on the present counter value.
- the microprocessor sends a signal representing the percentage of filter life remaining to the display which uses the signal to display the remaining useful life of the filter.
- the microprocessor is electrically connected to a fan speed selection switch so that the microprocessor detects a selected fan speed and adjusts the rate of counting by the counter based on the detected fan speed.
- the fan speed selection switch is positionable to one of a plurality of positions, each position being electrically connected to an input of the microprocessor, wherein the microprocessor detects the selected fan speed by sampling each microprocessor input.
- the display preferably comprises a plurality of light emitting devices, one of the light emitting devices being illuminated to display a level of remaining useful life of the filter.
- the circuit further preferably includes a memory device for storing the present counter value upon termination of fan use and for retrieving the present counter value by the microprocessor upon reactivation of the fan. Additionally, the circuit preferably includes a reset switch for resetting the present counter value to the predetermined initial counter value upon replacement of the filter.
- Figure 1 is a cross-sectional view of a filter-fan product having a filter monitoring system in accordance with the present invention.
- FIG. 2 is a simplified circuit diagram showing a preferred embodiment of the filter monitoring system in accordance with the present invention.
- Figure 3 is a simplified circuit diagram showing an alternate embodiment of the filter monitoring system in accordance with the present invention.
- Figure 4 is a simplified circuit diagram showing another alternate embodiment of the filter monitoring system in accordance with the present invention.
- FIG. 5 is a block circuit diagram of the preferred embodiment of the filter monitoring system in accordance with the present invention.
- FIG. 6 is a detailed schematic diagram of the preferred embodiment of the filter monitoring system in accordance with the present invention.
- Figure 7 is a schematic diagram of a printed circuit board of the present invention.
- FIG 1 illustrates a cross-section through an air purifier 10 having the present invention incorporated therein.
- the air purifier 10 shown in Figure 1, generally includes a housing 11, a fan 12, a fan motor 13, one or more filter assemblies 14 and electronic power circuitry 15 for operating the air purifier.
- the housing 11 may include a door 16, to facilitate replacement of the filter assemblies 14, and a perforated intake grille 17 and a perforated outlet grille 18, to allow the flow of air through the air purifier 10.
- the electronic power circuitry 15 which will be discussed in further detail below, generally includes a fan motor switch 19, for selecting the speed of the fan motor 13, a display 20 and a microprocessor 21.
- the rotation of the fan 12 causes air to be drawn through the intake grille 17 and into the filter assemblies 14 where the airborne particles are removed before the air exits through the outlet grille 18.
- This exemplifies the basic operation of a typical filter-fan device that uses replaceable filter assemblies.
- the present invention includes unique electronic circuitry 15 to monitor and "count” the use of the fan motor 13.
- each position of the fan switch 19 is connected to an input of the microprocessor 21 which "counts" usage of the fan motor based on fan motor speed.
- the fan switch 19 discussed hereinafter includes positions for “off', “low”, “medium”, “high” and “sleep” (intermittent), however, switches having fewer or more positions may be utilized with the present invention.
- Figures 2 - 4 are simplified circuit diagrams illustrating alternate approaches for detecting present fan speed.
- each position of the fan switch 19 is wired to an input of the microprocessor 21 through a similar circuit including diodes 22 and an RC network.
- the microprocessor 21 is programmed to determine which inputs are active and, from the lack of activity at one input, determines which position the fan speed switch 19 is in.
- the diodes 22 are used to clamp the voltage at the microprocessor input (i.e., to prevent the input from exceeding the power supply voltage or becoming more negative than ground).
- each position of the fan switch 19 is wired to an input of the microprocessor 21 through a similar circuit.
- AC voltage present at the fan switch positions is detected by a series diode and R/C network. This detector creates a dc voltage at the microprocessor input.
- the inactive inputs of the microprocessor 21 will have voltage, and the input corresponding to the selected speed will not.
- the additional diode is used to clamp the voltage at the microprocessor input (i.e., to prevent the input from exceeding the power supply voltage).
- the same circuit topology (with somewhat different values) is used. Unlike Figures 2 and 3 however, only one circuit is required to be connected to one of the fan switch positions. In this circuit, the capacitor is increased in value so that it requires many milliseconds for it to charge from the filter switch input. The additional resistor between the microprocessor input and the capacitor allows the microprocessor to change its input to output mode. In output mode, the microprocessor can discharge the capacitor. Then, if the microprocessor switches back to input mode, and by measuring the time that is required for the input to reach a logic ' 1 ' level, a measurement of the voltage at the fan switch position may be ascertained.
- the fan switch 19 allows for manual selection of the speed of the fan motor 13.
- the positions are designated “LI” for off, “L” for low, “M” for medium, “H” for high and “S” for sleep in Figure 5.
- each position of the fan switch 19 is connected to an input of the microprocessor 21 designated J2, J3, J4, J5 and J6, respectively, in Figure 5.
- Figure 5 also shows microprocessor inputs Jl and J2 connected to an optional door switch 23 to terminate power to the motor 13 when the device's filter door 16 is ajar.
- the microprocessor 21 includes a counter 24 which "counts" usage of the fan motor based on the selected fan motor speed.
- FIG. 6 is a detailed schematic diagram showing the electronic circuitry 15 in accordance with the preferred embodiment of the present invention as shown in Figures 2 and 5.
- the circuitry 15 generally includes the fan motor switch 19, the display 20, the microprocessor 21, a power supply 25, a filter time reset switch 26 and a non- volatile memory storage (NOVRAM) 27.
- the circuitry 15 is preferably incorporated into a PCB 28 as shown in Figure 6.
- the PCB 28 is preferably a single-sided design (i.e. tracks on etch side only, no plated-through holes), with the components mounted to the board using through-hole technology. This board design will allow for panelization.
- the power supply 25 uses a capacitive dropping design since general experience has shown that the capacitive type of supply is more reliable. This design provides fifteen milliamperes of current required to operate the microprocessor 21, the memory 27 and the display 20.
- the power supply 25 has an operating voltage of 115 VAC, 60 hertz and 230 VAC, 50 Hertz. (At the required current level, a resistive dropping design would have required the dissipation of multiple watts of power in the 230 VAC model.)
- the non-volatile memory storage 27 preferably has the capability for running up to
- a suitable memory device is Part No. 24C00 (available in 8 pin DIP) manufactured by Microchip and other sources. This device uses an I 2 C interface, requiring only clock and data lines from the microprocessor 21. The device is specified for 1,000,000 write cycles. As described below, the present program writes the device every 770 seconds. Thus, at this frequency, the memory will be written 410,000 times in ten years.
- the preferred microprocessor is the Microchip PIC16CR54C device.
- This device allows for minimal external support componentry while providing adequate RAM and Program Memory for the filter check application.
- the Microchip device includes internal diodes for clamping the voltage at the microprocessor input (diodes 22 shown in Figure 2).
- the Microchip microprocessor provides an external RC oscillator and external reset circuitry components. Development for the microprocessor 21 is performed using OTP parts in the Microchip MPLAB environment using assembly and/or C Language.
- the display 20 comprises six LEDs D3, D4, D5, D6, D7 and D8.
- the display 20 comprises six LEDs D3, D4, D5, D6, D7 and D8.
- the LEDs D3, D4, D5, D6, D7 and D8 Preferably, the
- LEDs are six discrete TP ⁇ LEDs including four green, one amber, one red only one of which are illuminated at one time.
- the LEDs are controlled by the microprocessor to indicate "Filter Life Remaining" in a vertical bar. Initially this display is lit at a 100% level. As the fan is run, the lit level drops over time until the 0% LED is lit.
- Table 2 defines which LED is lit as a function of percentage of "Filter Life Remaining”: Table 2
- the percentage of filter life remaining is determined by a program in the microprocessor 21 that is based on a straight-line linear relationship between total time of fan use and filter life remaining.
- Predetermined values for total filter life relative to fan speed are programmed into the microprocessor 21 and are used as baseline variables by the microprocessor program to determine filter life remaining. For example, it may be known that a particular filter has a life of 8,760 hours with a fan running at full speed. Inputting this value into the microprocessor's program will result in the microprocessor illuminating the red LCD D8, indicating 0%, after the fan has run at full speed for 8,760 hours. Accordingly, values for total filter life relative to other fan speeds can be calculated based on this value. Table 3 below shows exemplary predetermined baseline variables for programming the microprocessor.
- the microprocessor 21 then "counts" down based on these starting values and on actual fan use at the detected fan speed. In operation, the microprocessor functions in the following manner.
- the microprocessor 21 includes a RC clock that runs the microprocessor at 800 kHz.
- the processor divides this rate by four to achieve a 200 kHz nominal instruction speed (5 ⁇ sec per instruction). This frequency may be as low as 180 kHz or as high as 220 kHz depending on component tolerances and regulated voltage.
- Fan speed detection is implemented in the microprocessor firmware by continuously sampling the four fan speed switch inputs for transitions. Transitions are counted for each input using individual 8 bit counters. When the largest count is greater than the selected line frequency, then the sampling counters are serviced. Any counter that is less than ⁇ the value of the largest counter is set to be zero. The counters are reviewed in order, from the counter associated with the highest speed input to that associated with the slowest. The first zero counter detected establishes the present fan speed. If no zero counter is detected, the fan is assumed to be off. If the fan is detected as off twice in succession (for two seconds), the unit blanks the display. If the display is blanked, and a fan position is detected, the unit proceeds to the power-up test and display.
- the input counters are then decremented by 60 or 50 (the selected line frequency). Counters are zeroed if their value is less than line frequency. At this point, fan speed has been detected, and one second of filter life has been measured. From this point the filter life calculation proceeds.
- a prescaler is decremented.
- the amount the prescaler is decremented depends on the detected fan speed. At the fastest fan speed, the prescaler reaches zero every five seconds (12.5 seconds at the slowest speed). When this prescaler rolls, another following prescaler is decremented. This following prescaler reaches zero every 770 seconds at the fastest fan speed.
- the following prescaler decrements the filter life counter. This counter is a two byte value. Whenever this counter is decremented, it is re-written in triplicate to NOVRAM 27. The top three bits of this counter are displayed on the LED bar-graph. This counter is initially loaded to a predetermined initial counter value.
- Table 4 illustrates exemplary predetermined counter values for a given filter. Table 4
- the value 57,343 will light the 6 th LED (top green LED).
- the life counter will decrement to 49,151 after 73.01 days of fan use at the highest speed.
- the 6 th LED will turn off, and the 5 th LED will light.
- the LEDs are lit as indicated in Table 4.
- the filter life display 20 may be reset by depressing the filter life reset switch 26.
- the reset switch 26 is located below the LED display, as shown in Figure 6, and is accessible through a small hole (1/8" diameter) in the housing 11 of the air purifier 10. To achieve reset, the user must depress and hold the switch for several seconds. When the user depresses this switch, the time remaining display shall return to 100% (i.e. the top green LED will light) and the filter life counter is reset to 57343.
- R4, R9 Resistor, CF, 100K ohms, 1/4W, 5%
- Rl 1 Resistor, CF, 3.3K ohms, 1/4W, 5%
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA002366649A CA2366649A1 (en) | 2000-01-14 | 2001-01-12 | Filter-fan product including a circuit for monitoring the filter thereof |
EP01942331A EP1161303A1 (en) | 2000-01-14 | 2001-01-12 | Filter-fan product including a circuit for monitoring the filter thereof |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US17635500P | 2000-01-14 | 2000-01-14 | |
US60/176,355 | 2000-01-14 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001051214A1 true WO2001051214A1 (en) | 2001-07-19 |
Family
ID=22644013
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2001/001269 WO2001051214A1 (en) | 2000-01-14 | 2001-01-12 | Filter-fan product including a circuit for monitoring the filter thereof |
Country Status (4)
Country | Link |
---|---|
US (1) | US20010045159A1 (en) |
EP (1) | EP1161303A1 (en) |
CA (1) | CA2366649A1 (en) |
WO (1) | WO2001051214A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006120004A2 (en) * | 2005-05-11 | 2006-11-16 | Behr Gmbh & Co. Kg | Device for monitoring a motor vehicle component |
US7309387B2 (en) | 2004-08-20 | 2007-12-18 | The Dial Corporation | Methods and apparatus for a low-profile air purifier |
WO2014075348A1 (en) * | 2012-11-15 | 2014-05-22 | 创天昱科技(深圳)有限公司 | Method and apparatus for integrating effective use time of filtering net in air purifier |
CN104001559A (en) * | 2013-02-27 | 2014-08-27 | 海尔集团公司 | Biosafety cabinet able to remind filter's life |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7643959B2 (en) * | 2004-01-09 | 2010-01-05 | American Megatrends, Inc. | Methods, systems, and computer readable media that provide programming for a sensor monitoring system using a softprocessor |
US7334424B2 (en) * | 2004-10-22 | 2008-02-26 | Winiamando Inc. | Air conditioner having independent cooling and purifying paths |
US7757340B2 (en) | 2005-03-25 | 2010-07-20 | S.C. Johnson & Son, Inc. | Soft-surface remediation device and method of using same |
US8021469B2 (en) | 2005-07-14 | 2011-09-20 | Access Business Group International Llc | Control methods for an air treatment system |
US20070221061A1 (en) * | 2006-03-10 | 2007-09-27 | Hamilton Beach/Proctor-Silex, Inc. | Air purifier |
ITTV20080165A1 (en) * | 2008-12-23 | 2010-06-24 | Dama Service Srl | FILTERING DEVICE FOR PRESS SMOKES WITH AUTOMATIC SUCTION SPEED ADJUSTMENT. |
US8097067B2 (en) * | 2009-05-06 | 2012-01-17 | 3M Innovative Properties Company | Runtime sensor for small forced air handling units |
WO2016089688A1 (en) | 2014-12-01 | 2016-06-09 | 3M Innovative Properties Company | Systems and methods for predicting hvac filter change |
CN105929775B (en) * | 2016-05-19 | 2018-10-30 | 惠树龙 | Air purifier strainer life control method |
WO2019082040A1 (en) * | 2017-10-24 | 2019-05-02 | 3M Innovative Properties Company | Systems and methods for predicting hvac filter change using temperature measurements |
US20210239345A1 (en) * | 2018-04-20 | 2021-08-05 | Emerson Climate Technologies, Inc. | Hvac filter usage analysis system |
US10518206B1 (en) * | 2018-06-08 | 2019-12-31 | Lennox Industries Inc. | Systems and methods of predicting life of a filter in an HVAC system |
Citations (4)
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JPS63137718A (en) * | 1986-11-28 | 1988-06-09 | Matsushita Electric Ind Co Ltd | Air cleaner |
JPH03169358A (en) * | 1989-11-28 | 1991-07-23 | Matsushita Refrig Co Ltd | Air purifying apparatus |
JPH04203731A (en) * | 1990-11-30 | 1992-07-24 | Hitachi Ltd | Air conditioner |
US6036757A (en) * | 1998-07-10 | 2000-03-14 | Honeywell Inc. | Portable room air purifier |
-
2001
- 2001-01-12 CA CA002366649A patent/CA2366649A1/en not_active Abandoned
- 2001-01-12 WO PCT/US2001/001269 patent/WO2001051214A1/en not_active Application Discontinuation
- 2001-01-12 EP EP01942331A patent/EP1161303A1/en not_active Withdrawn
- 2001-01-12 US US09/761,168 patent/US20010045159A1/en not_active Abandoned
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63137718A (en) * | 1986-11-28 | 1988-06-09 | Matsushita Electric Ind Co Ltd | Air cleaner |
JPH03169358A (en) * | 1989-11-28 | 1991-07-23 | Matsushita Refrig Co Ltd | Air purifying apparatus |
JPH04203731A (en) * | 1990-11-30 | 1992-07-24 | Hitachi Ltd | Air conditioner |
US6036757A (en) * | 1998-07-10 | 2000-03-14 | Honeywell Inc. | Portable room air purifier |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7309387B2 (en) | 2004-08-20 | 2007-12-18 | The Dial Corporation | Methods and apparatus for a low-profile air purifier |
WO2006120004A2 (en) * | 2005-05-11 | 2006-11-16 | Behr Gmbh & Co. Kg | Device for monitoring a motor vehicle component |
WO2006120004A3 (en) * | 2005-05-11 | 2006-12-28 | Behr Gmbh & Co Kg | Device for monitoring a motor vehicle component |
WO2014075348A1 (en) * | 2012-11-15 | 2014-05-22 | 创天昱科技(深圳)有限公司 | Method and apparatus for integrating effective use time of filtering net in air purifier |
CN104001559A (en) * | 2013-02-27 | 2014-08-27 | 海尔集团公司 | Biosafety cabinet able to remind filter's life |
Also Published As
Publication number | Publication date |
---|---|
EP1161303A1 (en) | 2001-12-12 |
CA2366649A1 (en) | 2001-07-19 |
US20010045159A1 (en) | 2001-11-29 |
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