CN109538945B - Universal type vehicle-mounted fuel system leakage detection device - Google Patents
Universal type vehicle-mounted fuel system leakage detection device Download PDFInfo
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- CN109538945B CN109538945B CN201811544868.2A CN201811544868A CN109538945B CN 109538945 B CN109538945 B CN 109538945B CN 201811544868 A CN201811544868 A CN 201811544868A CN 109538945 B CN109538945 B CN 109538945B
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- 239000000446 fuel Substances 0.000 title claims abstract description 65
- 238000001514 detection method Methods 0.000 title claims abstract description 33
- 238000005192 partition Methods 0.000 claims description 34
- 239000000428 dust Substances 0.000 claims description 25
- 239000012528 membrane Substances 0.000 claims description 20
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 18
- 229910052799 carbon Inorganic materials 0.000 claims description 18
- 238000009423 ventilation Methods 0.000 claims description 9
- 230000009467 reduction Effects 0.000 claims description 8
- 239000002985 plastic film Substances 0.000 claims description 7
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 239000002828 fuel tank Substances 0.000 description 7
- 238000001704 evaporation Methods 0.000 description 6
- 230000008020 evaporation Effects 0.000 description 6
- 230000008859 change Effects 0.000 description 5
- 241000156302 Porcine hemagglutinating encephalomyelitis virus Species 0.000 description 4
- 230000006870 function Effects 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000003796 beauty Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- 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
- F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
- F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
- F02M25/0809—Judging failure of purge control system
- F02M25/0818—Judging failure of purge control system having means for pressurising the evaporative emission space
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/02—Preventing, monitoring, or locating loss
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
- F16K11/10—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with two or more closure members not moving as a unit
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
- F16K31/126—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a diaphragm, bellows, or the like
- F16K31/1262—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a diaphragm, bellows, or the like one side of the diaphragm being spring loaded
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
- F16K31/126—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a diaphragm, bellows, or the like
- F16K31/1266—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a diaphragm, bellows, or the like one side of the diaphragm being acted upon by the circulating fluid
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Supplying Secondary Fuel Or The Like To Fuel, Air Or Fuel-Air Mixtures (AREA)
- Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
Abstract
The invention relates to a universal vehicle-mounted fuel system leakage detection device which comprises a diaphragm pump provided with an active diaphragm, a two-way vent valve and a pressure sensor arranged in the two-way vent valve and used for measuring the pressure of a fuel system. The universal vehicle-mounted fuel system leakage detection device has the advantages of simple structure, safe use, high detection rate and high cost performance.
Description
Technical Field
The invention belongs to the field of fuel evaporation control systems, and particularly relates to a universal vehicle-mounted fuel system leakage detection device.
Background
The fuel evaporation control system is generally composed of a fuel tank assembly, a carbon tank assembly, an ash filter, a carbon tank desorption control valve and connecting pipelines thereof, wherein the carbon tank can be used for absorbing fuel vapor volatilized from the fuel tank assembly and enabling the fuel vapor to participate in engine combustion when an automobile is started. If the fuel evaporation control system has pipeline breakage or assembly leakage, fuel vapor can volatilize into the atmosphere from the system, thereby causing environmental pollution and resource waste.
Accordingly, many countries, including the middle and beauty, have regulations requiring the provision of an on-board diagnostic system (OBD) to identify possible leaks and signal the same, and to provide corresponding data to on-board memory for use by the factory to perform off-line diagnostics.
In the prior art, chinese patent application No. 200610009060.5 discloses a leak detection system for a vehicle fuel tank, which can diagnose whether a fuel system leaks or not by using a pressure signal change caused by natural vacuum in the fuel tank when an engine is turned off. Although the system is low in detection cost, the system can be basically used on common fuel vehicles, and for PHEV vehicles in which a fuel tank isolation valve is adopted to separate a fuel tank assembly from a fuel evaporation control system, the system cannot be used because natural vacuum in the fuel tank cannot be utilized. The device for detecting the tightness of the fuel system of the motor vehicle disclosed in the German patent application with the application number of 10131162.1 can be used on common fuel vehicles and PHEV vehicles at the same time. The device comprises a vane pump, a reversing valve and other structures, and whether the fuel system leaks or not is judged by comparing the voltage and current characteristics of the vane pump penetrating through the fuel system and the reference pore plate. The device has a complex structure and high cost, so the application range is small; and because the vane pump is in direct contact with fuel vapor, the combustion risk is easy to occur under the condition of the clamping stagnation or the electrical short circuit of the vane pump.
Disclosure of Invention
The invention aims to overcome the problems in the prior art and provide a universal vehicle-mounted fuel system leakage detection device which is reasonable in structure and low in cost, and can be used on common fuel vehicle types and PHEV vehicle types.
The invention provides a universal vehicle-mounted fuel system leakage detection device which comprises a diaphragm pump provided with an active diaphragm, a two-way vent valve and a pressure sensor arranged in the two-way vent valve and used for measuring the pressure of a fuel system;
the two-way ventilation valve comprises a valve body, an exhaust valve cover and a driven diaphragm arranged between the valve body and the exhaust valve cover; the valve body is internally provided with a baffle plate, the baffle plate and the driven diaphragm are arranged in parallel with the driving diaphragm, a first cavity is formed between the driving diaphragm and the baffle plate, a second cavity is formed between the driven diaphragm and the exhaust valve cover, and a fuel system channel is formed between the driven diaphragm and the baffle plate;
the fuel system channel consists of a first air channel, a second air channel communicated with the carbon tank and a third chamber communicated with the ash filter; the two ends of the third chamber are respectively connected with the driven membrane and the partition plate, the second air passage is positioned in the third chamber, one end of the second air passage is kept at an elastic distance from the driven membrane, the other end of the second air passage is communicated with the first chamber, the two ends of the first air passage are respectively communicated with the first chamber and the second chamber, the first air passage is provided with a first one-way valve which can lead gas to pass from the first chamber to the second chamber, and the second air passage is provided with a second one-way valve which can lead gas to pass from the carbon tank to the first chamber.
Further, the first air passage is arranged on one side of the fuel system channel, one end of the first air passage is connected with the driven membrane, the other end of the first air passage is connected with the partition plate, a driven membrane hole is formed in the opening of one end of the driven membrane corresponding to the first air passage, and a first through hole is formed in the opening of the other end of the partition plate corresponding to the first air passage.
Further, the second air passage is arranged in the middle of the fuel system channel, the other end of the second air passage is connected with the partition plate, and a second through hole is formed in the opening of the other end of the partition plate corresponding to the second air passage.
Further, the first one-way valve is a duckbill valve, and the duckbill valve is inserted into the first air passage through the first through hole; the second one-way valve is an umbrella valve, the handle of the umbrella valve penetrates through the second through hole and is inserted into the second air passage, and a plurality of third air holes are formed in the position, corresponding to the umbrella face of the umbrella valve, of the partition plate.
Further, the two-way vent valve further comprises a carbon canister interface and an ash filter interface; the two ends of the carbon tank interface are respectively connected with the carbon tank atmospheric port and the side wall of the second air passage, the two ends of the ash filter interface are respectively connected with the ash filter and the side wall of the third chamber, and the pressure taking hole of the pressure sensor is arranged in the carbon tank interface.
Further, the exhaust valve cover comprises a cover body, a shaft arranged at the top of the cover body, a dust cover sleeved on the shaft and capable of rotating around the shaft, and a porous dust cover arranged at the top of the dust cover; the top of the cover body is provided with a first pressure relief hole close to the shaft, and the dust cover is provided with a second pressure relief hole matched with the first pressure relief hole to adjust the air outlet quantity.
Further, the cover body is provided with scales corresponding to the periphery of the dust cover, and the dust cover is provided with a pointer which can be used for indicating the scales.
Further, the diaphragm pump comprises a micro motor, a reduction gear coaxially rotating with the micro motor, a cam component meshed with the reduction gear, and a roller wheel arranged between the cam component and the driving diaphragm; the roller is driven by the cam component to make the active diaphragm reciprocate.
Further, the driving diaphragm and the driven diaphragm are both composed of a rubber outer ring and plastic sheets fixed in the ring, and elastic pieces are respectively arranged between the two plastic sheets and the partition plate for supporting.
Further, the pressure sensor and the two-way vent valve are injection molded into one body.
The invention has the beneficial effects that:
the invention relates to a universal vehicle-mounted fuel system leakage detection device which comprises a diaphragm pump, a two-way ventilation valve and a pressure sensor, wherein after the device is connected with an ECU detection instruction, the diaphragm pump is electrified to start working, positive pressure is distributed and transmitted to a driven diaphragm area through the two-way ventilation valve to close a fuel system, then negative pressure is used for pumping air from the fuel system, the pressure sensor feeds back a pressure signal in the fuel system to the ECU, the ECU compares whether the pressure signal reaches a preset pressure or not, if the pressure reaches the preset pressure, a power-off signal is sent, and the diaphragm pump automatically loses function. By monitoring the pressure change in the pressure sensor, it is possible to determine whether the fuel system has a leak.
The leakage detection device of the universal vehicle-mounted fuel system can completely separate the electric part from the fuel steam part through the isolation of the rubber diaphragm, and is safer and more reliable.
The pressure generating source of the universal vehicle-mounted fuel system leakage detection device is a miniature diaphragm pump, and the detection device is an integrated pressure sensor, so that the structure is simple, and the manufacturing cost is low.
The detection device can be used for replacing a pressure sensor and a CVS valve on a common fuel vehicle, and can also be used for replacing functions of a DMTL and an ELCM system on a PHEV vehicle. The different vehicle types are freely replaced, the OBD calibration program and strategy do not need to be repeatedly adjusted, and the development period of a new vehicle type can be greatly reduced.
Drawings
FIG. 1 is an isometric view of a leak detection apparatus for a generic vehicle-mounted fuel system according to the present invention;
FIG. 2 is a schematic view of FIG. 1 taken along the line A-A;
FIG. 3 is a schematic view of the section B-B of FIG. 1;
FIG. 4 is a cross-sectional view of a diaphragm pump according to the present invention;
FIG. 5 is a schematic view of the structure of the cover, shaft and first pressure relief vent of the present invention;
FIG. 6 is a mating view of the cover and dust cap of the present invention;
FIG. 7 is an enlarged view at C in FIG. 3;
FIG. 8 is a schematic diagram of the gas flow of the leak detection apparatus for a vehicle-mounted fuel system in the normal state according to the present invention;
FIG. 9 is a schematic diagram of the gas flow when the leakage detection device of the general-purpose vehicle-mounted fuel system according to the present invention;
FIG. 10 is a second schematic diagram of the gas flow when the leakage detection device of the general-purpose vehicle-mounted fuel system according to the present invention;
in the figure: a diaphragm pump 100; an active diaphragm 110; a micro motor 120; micromotor PIN a 122; micro motor PIN b 123; a reduction gear 130; a cam assembly 140; a cam gear 141; a cam 142; a roller 151; a roller bracket 152; a pin 153; a motor interface 160;
a two-way vent valve 200; a first chamber 201; a second chamber 202; a first air duct 203; a second airway 204; a third chamber 205; a valve body 210; an exhaust valve cover 220; a cover 221; a shaft 222, a dust cover 223; a dust cover 223; a porous dust cap 224, a first pressure relief aperture 225; a second pressure relief vent 226; a scale 227; a pointer 228; filtering the sponge 229; a driven diaphragm 230; a partition 240; a first spring 241; a second spring 242; a third vent 243; a first check valve 250; a second check valve 260; a seal ring 270; a canister interface 280; an ash filter interface 290;
a pressure sensor 300; a pressure chip 310; pressure chip PIN a 321; pressure chip PIN b 322; a pressure chip PIN c 323; a pressure taking hole 330; sensor interface 340.
Detailed Description
The following detailed description of the invention is, therefore, not to be taken in a limiting sense, but is made merely by way of example. While the invention will be described in further detail by means of specific examples.
The universal vehicle fuel system leak detection apparatus shown in fig. 1-9 includes a diaphragm pump 100, a two-way vent valve 200, and a pressure sensor 300.
As shown in fig. 1 to 4, the diaphragm pump 100 has a driving diaphragm 110 on an upper end surface thereof, and a micro motor 120, a reduction gear 130 coaxially rotated with the micro motor 120, a cam assembly 140, and a roller 151 are assembled therein. The micro motor 120 is provided with a PIN needle a121 and a micro motor PIN needle b122, and the micro motor PIN needle a121 and the micro motor PIN needle b122 are electrically connected with the motor interface 160. The cam assembly 140 includes a cam gear 141 and a cam 142, and the cam gear 141 is engaged with the reduction gear 130 and drives the cam 142 to rotate by a cam shaft. The roller 151 is disposed between the cam 142 and the active diaphragm 110, and may be fixed to a roller bracket 152 connected to the active diaphragm 110 through a pin 153.
The diaphragm pump has the main function of generating positive and negative pressure states in the device, when the ECU gives a leakage detection instruction, the micro motor 120 rotates, the coaxial reduction gear 130 of the micro motor rotates in meshed with the coaxial cam gear 141 of the cam assembly 140, and the cam 142 of the cam assembly 140 converts the rotation force into up-and-down motion. When the cam 142 runs to a high point, the roller 151 is pushed to move upwards, so that the active diaphragm 110 stretches into the two-way ventilation valve 200, and positive pressure is formed in the two-way ventilation valve 200 and a chamber related to the active diaphragm 110; when the cam 142 moves to a low point, the roller 151 falls, the active membrane 110 is restored, and at this time, a negative pressure is formed in the bi-directional vent valve 200 in a chamber associated with the active membrane 110.
As shown in fig. 1-3, the bi-directional vent valve 200 includes a valve body 210, a vent valve cap 220, a driven diaphragm 230 disposed between the valve body 210 and the vent valve cap 220, an oppositely disposed canister interface 280, and an ash filter interface 290.
The valve body 210 is internally provided with a partition 240, the partition 240 and the driven diaphragm 230 are arranged in parallel with the driving diaphragm 110, a first chamber 201 is formed between the driving diaphragm 110 and the partition 240, a second chamber 202 is formed between the driven diaphragm 230 and the exhaust valve cover 220, and a fuel system channel is formed between the driven diaphragm 230 and the partition 240. In this embodiment, the driving diaphragm 110 and the driven diaphragm 230 are both composed of a rubber outer ring and a plastic sheet fixed in the ring, the rubber outer ring and the plastic sheet are vulcanized together, the thickness of the rubber outer ring is between 0.2mm and 0.8mm, the U-shaped folds are designed to realize free expansion and contraction of the rubber film, and the outer edge of the rubber film is designed with an infinity sealing line which can be used for two adjacent independent chambers. In order to better provide elastic pressure for the plastic sheet, a first spring 241 is assembled between the driving diaphragm 110 and the partition 240, and a second spring 242 is assembled between the driven diaphragm 230 and the partition 240.
As shown in fig. 2 and 3, the fuel system passage is composed of a first air passage 203, a second air passage 204, and a third chamber 205. Both ends of the third chamber 205 are respectively connected with the driven diaphragm 230 and the partition 240, and the sidewall of the third chamber 205 is communicated with the ash filter interface 290. The second air passage 204 is located in the third chamber 205, and the second air passage 204 is a three-way air passage, one end of the second air passage is kept at an elastic distance from the driven membrane 230, the other end of the second air passage is communicated with the first chamber 201, and an opening on the side wall of the second air passage is communicated with the carbon canister interface 280. And the first air passage 203 is two air passages, and two ends of the first air passage are respectively communicated with the first chamber 201 and the second chamber 202.
The first air channel 203 is located at one side of the fuel system channel, one end of the first air channel 203 is connected with the driven membrane 230, the other end is connected with the partition 240, a driven membrane hole is formed at an opening of the driven membrane 230 corresponding to one end of the first air channel 203, and a first through hole is formed at an opening of the partition 240 corresponding to the other end of the first air channel 203. The second air passage 204 is located in the middle of the fuel system channel, the other end of the second air passage 204 is connected with a partition 240, and a second through hole is formed in the partition 240 corresponding to the opening at the other end of the second air passage 204.
The first gas passage 203 is provided with a first vent valve 250 for allowing gas to pass from the first chamber 201 into the second chamber 202, and the second gas passage 204 is provided with a second vent valve 260 for allowing gas to pass from the canister into the first chamber 201. In this embodiment, the first ventilation valve 250 is a duckbill valve, which may be vulcanized from rubber such as NBR, nbr+pvc, or FKM, and is inserted into the first air duct 203 through the first through hole. When the diaphragm pump generates positive pressure, the duckbill valve opens and gas enters the first gas channel 203 from the first chamber 201 and passes further to the second chamber 202; in the negative pressure state, two rubber sheets of the duckbilled are tightly attached, and gas cannot pass through. In this embodiment, the second ventilation valve 260 is an umbrella valve, and may also be formed by vulcanizing rubber such as NBR, nbr+pvc or FKM, wherein the handle of the umbrella valve is inserted into the second air passage 204 through the second through hole, the edge of the umbrella surface is a sealing surface, and the position of the partition 240 corresponding to the umbrella surface is provided with a plurality of third ventilation holes 243. When the first chamber is at positive pressure, the edge of the umbrella surface is attached to the surface of the partition plate 260, and the air flow cannot pass through the first chamber; when the first chamber is at negative pressure, air flow is transmitted to the first chamber from the second air passage through the umbrella valve.
As shown in fig. 5, the exhaust valve cover 220 includes a cover body 221, a shaft 222 provided at the top of the cover body 221, a dust cover 223 rotatably coupled to the shaft 222 around the shaft 222, and a porous dust cover 224 mounted at the top of the dust cover 223; the top of the cover 221 is provided with a first pressure relief hole 225 near the shaft 222, and the dust cover 223 is provided with a second pressure relief hole 226 which is matched with the first pressure relief hole 225 to adjust the air outlet quantity. The dust cover 223 is rotated to adjust the area of the vent hole formed by overlapping the first pressure relief hole 225 and the second pressure relief hole 226, so as to control the response time of the driven diaphragm 230 for opening and closing the fuel system. For convenient adjustment, the cover 221 is provided with a scale 227 corresponding to the periphery of the dust cover 223, the dust cover 222 is provided with a pointer 228 for indicating the scale 227, and the rotation to different angles represents different areas. In order to avoid dust, a filter sponge 229 is further provided in the dust cover 223.
As shown in fig. 4 and 7, the pressure sensor 300 is directly injection molded with the valve body 210 without additional connection, and includes a sensing chip 310 and PIN PINs directly soldered with corresponding contacts of the sensing chip, and the outer ends are connected with a sensor interface 340. In this embodiment, the pressure sensor 300 is integrated on the lower side of the partition 240, and the pressure taking hole 330 is provided in the canister interface 280, specifically, at a position of the partition 240 corresponding to the canister interface 280.
The main function of the pressure sensor in the device is to convert the pressure in the fuel evaporation control system into an electric signal and transmit the electric signal to the ECU, the ECU can compare the curvature or trend of the signal change with a reference curve, and if the trend is the same or close, the system is judged to be free from leakage, otherwise, the leakage is judged.
The working method comprises the following steps:
normally, as shown in fig. 8, the leak detection device for the general vehicle-mounted fuel system according to the present invention is smooth, the second air passage 204 is separated from the driven diaphragm 230, and the air between the canister and the ash filter normally passes through and exchanges between the second air passage 204 and the third chamber 205.
When the ECU system gives a detection instruction, the diaphragm pump 100 works, the positive pressure generated by the diaphragm pump makes the driving diaphragm 110 move upwards against the elastic force of the first spring 241, the positive pressure is formed in the first chamber 201, when the opening pressure of the duckbill valve 250 is exceeded, the positive pressure in the first chamber 201 is transferred into the second chamber 202 through the first air channel 203, as the driven diaphragm 230 is continuously enhanced by the positive pressure, a small amount of air escapes from the exhaust valve cover 220, and the pressure of most of the air can cause the driven diaphragm 230 to move downwards against the elastic force of the second spring 142 until the driven diaphragm 230 presses against the other end opening of the second air channel 204, so that the air tightness is increased, the sealing ring 270 can be installed at the other end opening, and the air flow channel between the carbon tank and the ash filter is completely disconnected.
When the diaphragm pump is operated to negative pressure, a negative pressure is formed in the first chamber 201, when the opening pressure of the umbrella valve 260 is exceeded, as shown in fig. 7, the device extracts gas from the fuel evaporation control system through the carbon canister, the pressure sensor feeds back a pressure signal in the fuel system to the ECU, when the pressure signal reaches a preset pressure, the ECU sends a power-off signal, the diaphragm pump automatically stops working, the driven diaphragm 230 cannot obtain continuous positive pressure, the air pressure can be continuously released through the exhaust valve cover 220, when the air pressure and the atmospheric pressure in the second chamber 202 are gradually balanced, the driven diaphragm 230 is separated from the sealing ring 270 by the elasticity of the second spring 142, deformation is recovered, and the carbon canister is completely communicated with the ash filter. The pressure change in the pressure sensor is monitored in the whole detection process, and whether the fuel system has leakage can be judged by comparing the pressure change with a standard pressure curve.
What is not described in detail in this specification is prior art known to those skilled in the art.
Claims (8)
1. General on-vehicle fuel system leak detection device, its characterized in that: comprises a diaphragm pump (100) provided with an active diaphragm (110), a two-way vent valve (200) and a pressure sensor (300) arranged in the two-way vent valve (200) and used for measuring the pressure of the fuel system; the bi-directional vent valve (200) comprises a valve body (210), an exhaust valve cover (220), and a driven diaphragm (230) arranged between the valve body (210) and the exhaust valve cover (220); a partition plate (240) is arranged in the valve body (210), the partition plate (240) and the driven membrane (230) are arranged in parallel with the driving membrane (110), a first chamber (201) is formed between the driving membrane (110) and the partition plate (240), a second chamber (202) is formed between the driven membrane (230) and the exhaust valve cover (220), and a fuel system channel is formed between the driven membrane (230) and the partition plate (240); the fuel system channel consists of a first air channel (203), a second air channel (204) communicated with the carbon tank and a third chamber (205) communicated with the ash filter; the two ends of the third chamber (205) are respectively connected with the driven diaphragm (230) and the partition plate (240), the second air passage (204) is positioned in the third chamber (205) and one end of the second air passage (204) is kept at an elastic distance from the driven diaphragm (230), the other end of the second air passage (204) is communicated with the first chamber (201), the two ends of the first air passage (203) are respectively communicated with the first chamber (201) and the second chamber (202), the first air passage (203) is provided with a first one-way valve (250) which can enable gas to pass from the first chamber (201) to the second chamber (202), and the second air passage (204) is provided with a second one-way valve (260) which can enable gas to pass from the carbon tank to the first chamber (201);
the bi-directional vent valve (200) further includes a canister interface (280) and an ash filter interface (290); two ends of the carbon tank interface (280) are respectively connected with a carbon tank atmospheric port and the side wall of the second air channel (204), two ends of the ash filter interface (290) are respectively connected with an ash filter and the side wall of the third chamber (205), and a pressure taking hole (330) of the pressure sensor (300) is arranged in the carbon tank interface (280);
the diaphragm pump (100) comprises a micro motor (120), a reduction gear (130) coaxially rotating with the micro motor (120), a cam assembly (140) meshed with the reduction gear (130), and a roller (151) arranged between the cam assembly (140) and the driving diaphragm (110); the roller (151) makes the driving membrane (110) reciprocate under the drive of the cam component (140);
the driving diaphragm (110) and the driven diaphragm (230) are both composed of a rubber outer ring and a plastic sheet fixed in the ring.
2. The universal vehicle fuel system leak detection apparatus as defined in claim 1, wherein: the first air passage (203) is arranged on one side of a fuel system channel, one end of the first air passage (203) is connected with the driven membrane (230), the other end of the first air passage is connected with the partition plate (240), a driven membrane hole is formed in the position, corresponding to the opening of one end of the first air passage (203), of the driven membrane (230), and a first through hole is formed in the position, corresponding to the opening of the other end of the first air passage (203), of the partition plate (240).
3. The universal vehicle fuel system leak detection apparatus as defined in claim 2, wherein: the second air passage (204) is arranged in the middle of the fuel system channel, the other end of the second air passage (204) is connected with the partition plate (240), and a second through hole is formed in the opening of the other end of the partition plate (240) corresponding to the second air passage (204).
4. A universal vehicle fuel system leak detection apparatus as defined in claim 3, wherein: the first one-way valve (250) is a duckbill valve, and the duckbill valve is inserted into the first air passage (203) through the first through hole; the second one-way valve (260) is an umbrella valve, the handle of the umbrella valve passes through the second through hole and is inserted into the second air passage (204), and a plurality of third air holes (243) are formed in the position of the partition plate (240) corresponding to the umbrella surface of the umbrella valve.
5. The universal vehicle fuel system leak detection apparatus as defined in claim 1, wherein: the exhaust valve cover (220) comprises a cover body (221), a shaft (222) arranged at the top of the cover body (221), a dust cover (223) sleeved on the shaft (222) and capable of rotating around the shaft (222), and a porous dust cover (224) arranged at the top of the dust cover (223); the top of the cover body (221) is provided with a first pressure relief hole (225) close to the shaft (222), and the dust cover (223) is provided with a second pressure relief hole (226) which is matched with the first pressure relief hole (225) to adjust the air outlet quantity.
6. The universal vehicle fuel system leak detection apparatus as defined in claim 5, wherein: the cover body (221) is provided with a scale (227) corresponding to the periphery of the dust cover (223), and the dust cover (222) is provided with a pointer (228) used for indicating the scale (227).
7. The universal vehicle fuel system leak detection apparatus as defined in claim 1, wherein: elastic pieces are supported between the two plastic sheets and the partition plate (240).
8. The universal vehicle fuel system leak detection apparatus as defined in claim 7, wherein: the pressure sensor (300) and the two-way ventilation valve (200) are integrally injection molded.
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| CN110397748B (en) * | 2019-08-09 | 2024-08-27 | 东风富士汤姆森调温器有限公司 | Magnetic valve for ventilation of carbon tank |
| CN111997770B (en) * | 2020-08-28 | 2021-12-17 | 东风汽车集团有限公司 | Vehicle-mounted leakage diagnosis device and fuel evaporation control system |
| CN112267958B (en) * | 2020-11-14 | 2024-07-05 | 德安福(天津)汽车技术有限公司 | Fuel tank isolation valve and use method thereof |
| CN113685291B (en) * | 2021-08-03 | 2022-12-23 | 东风富士汤姆森调温器有限公司 | Oil tank isolating valve |
| DE102022110336A1 (en) * | 2022-04-28 | 2023-11-02 | Thomas Magnete Gmbh | Leakage diagnostic method and leakage diagnostic system for a tank of a vehicle |
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