CN109538945A - Universal vehicle-mounted fuel systems leak detecting device - Google Patents
Universal vehicle-mounted fuel systems leak detecting device Download PDFInfo
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- CN109538945A CN109538945A CN201811544868.2A CN201811544868A CN109538945A CN 109538945 A CN109538945 A CN 109538945A CN 201811544868 A CN201811544868 A CN 201811544868A CN 109538945 A CN109538945 A CN 109538945A
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- air flue
- valve
- chamber
- diaphragm
- detecting device
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- 239000000446 fuel Substances 0.000 title claims abstract description 61
- 238000005192 partition Methods 0.000 claims description 35
- 239000000428 dust Substances 0.000 claims description 20
- 229920001971 elastomer Polymers 0.000 claims description 11
- 239000005060 rubber Substances 0.000 claims description 11
- 239000002985 plastic film Substances 0.000 claims description 7
- 230000009467 reduction Effects 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 4
- 238000001746 injection moulding Methods 0.000 claims description 3
- 239000012528 membrane Substances 0.000 claims 1
- 238000005259 measurement Methods 0.000 abstract 1
- 238000012795 verification Methods 0.000 abstract 1
- 238000001514 detection method Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 7
- 239000002828 fuel tank Substances 0.000 description 7
- 238000001704 evaporation Methods 0.000 description 6
- 230000008020 evaporation Effects 0.000 description 6
- 238000007789 sealing Methods 0.000 description 5
- 241000156302 Porcine hemagglutinating encephalomyelitis virus Species 0.000 description 4
- 230000006870 function Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 238000004073 vulcanization Methods 0.000 description 2
- 241000269799 Perca fluviatilis Species 0.000 description 1
- 230000003796 beauty Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
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- 238000013268 sustained release Methods 0.000 description 1
- 239000012730 sustained-release form Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
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
- 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
-
- 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
-
- 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
Abstract
The present invention relates to universal vehicle-mounted fuel systems leak detecting devices, including diaphragm pump, two-way air vent valve equipped with active diaphragm, and are located in two-way air vent valve for measuring the pressure sensor of fuel system pressure.Universal vehicle-mounted fuel systems leak detecting device structure of the present invention is simple, using safe, verification and measurement ratio is high, cost performance is high.
Description
Technical field
The invention belongs to fuel evaporation control system fields, and in particular to universal vehicle-mounted fuel systems leak detection dress
It sets.
Background technique
Fuel evaporation control system is usually by fuel tank assembly, canister assembly, grey filter, canister removal control valve and its connection
Pipeline is constituted, wherein canister can be used for adsorbing the fuel-steam evaporated from fuel tank assembly, and make it in automobile starting
Participate in engine combustion.If there are the damaged or total members of pipeline to leak in fuel evaporation control system, fuel-steam
It can be evaporate into atmosphere from system, cause environmental pollution and the wasting of resources.
Therefore, many countries in, including beauty have all put into effect regulation, it is desirable that it is equipped with onboard diagnostic system (OBD), with
It identifies possible leakage and issues signal, and then corresponding data are supplied to vehicle-mounted memory and are used to factory and execute examine offline
It is disconnected.
In the prior art, application No. is 200610009060.5 Chinese patent applications to disclose a kind of vehicle fuel tank institute
Leak detection system can cause pressure signal variation to diagnose combustion in tail-off using natural vacuum in fuel tank
Whether oil system has leakage.Although the system detection is at low cost, can only substantially be used on regular fuel vehicle, for adopting
The PHEV vehicle for being separated fuel tank assembly and fuel evaporation control system with fuel tank isolation valve, due to that can not utilize in fuel tank
Natural vacuum, therefore the unusable system.And for motor-driven disclosed in the German patent application application No. is 10131162.1
The device of vehicle fuel system sealing propertytest can then use on regular fuel vehicle and PHEV vehicle simultaneously.The device is by leaf
The structure compositions such as piece pump and reversal valve, pass through fuel system by comparison vane pump and pass through the voltage and current feature with reference to orifice plate
To judge whether fuel system leaks.Since the apparatus structure is complicated, higher cost, the scope of application is small；Again because of it
Vane pump is directly contacted with fuel-steam, is also easy to occur burning risk in the case where blade pump seizure or electric short circuit.
Summary of the invention
It is an object of the invention to overcome problems of the prior art, a kind of universal vehicle-mounted fuel systems are provided and are let out
Device for detecting leakage, it is structurally reasonable, cost is relatively low, it both can be in regular fuel vehicle using or making in PHEV vehicle
With.
Universal vehicle-mounted fuel systems leak detecting device provided by the present invention includes the diaphragm pump, double equipped with active diaphragm
To breather valve, and it is located in two-way air vent valve for measuring the pressure sensor of fuel system pressure；
The two-way air vent valve includes valve body, exhaust valve cap, and the driven diaphragm between valve body and exhaust valve cap；
Partition, the partition and driven diaphragm is equipped in the valve body to be arranged in parallel with active diaphragm, the active diaphragm and partition it
Between form first chamber, second chamber is formed between the driven diaphragm and exhaust valve cap, between the driven diaphragm and partition
Then form fuel system channel；
The fuel system channel is by the first air flue, the second air flue being connected to canister and the third chamber being connected to grey filter
Room composition；The both ends of the third chamber are connect with driven diaphragm and partition respectively, and second air flue is located in third chamber
And one end and driven diaphragm keep elastic distance, the other end of second air flue is connected to first chamber, and described first
The both ends of air flue are then connected to first chamber and second chamber respectively, and first air flue is equipped with and gas can be made from first chamber
The first check valve in second chamber is reached, second air flue is equipped with that gas can be made to be reached in first chamber from canister
Two check valves.
Further, first air flue is located at the side in fuel system channel, one end of first air flue with it is driven
Diaphragm connection, the other end and partition connect, and the corresponding first air flue place open at one end of driven diaphragm is equipped with driven fenestra, described
Partition corresponds to the first air flue other end opening and is equipped with first through hole.
Further, second air flue is located at the middle part in fuel system channel, the other end of second air flue with every
Plate connection, the partition correspond to the second air flue other end opening and are equipped with the second through-hole.
Further, first check valve is duckbill valve, and the duckbill valve passes through first through hole and is inserted into the first air flue
It is interior；The second one-way valve is umbrella valve, and the bright portion of the umbrella valve passes through the second through-hole and is inserted into the second air flue, the partition pair
It answers and offers multiple third ventholes at the umbrella cover position of umbrella valve.
Further, the two-way air vent valve further includes canister interface and grey filter interface；The both ends of the canister interface
Connect respectively with canister atmospheric air port and the second air flue side wall, and the both ends of the grey filter interface then respectively with grey filter and third
The pressure port of chamber sidewall connection, the pressure sensor is set in canister interface.
Further, the exhaust valve cap includes lid, the axis being located at the top of lid, is socketed on axis and can be pivoted
Dust cover, and it is mounted on the porous dustproof cover at the top of dust cover；The first relief hole, institute are equipped with by paraxial place at the top of the lid
It states dust cover and is equipped with the second relief hole for cooperating with the first relief hole and adjusting gas output.
Further, the lid, which corresponds to, is equipped with scale at dust cover periphery, the dust cover is equipped with and may be used to indicate
The pointer of scale.
Further, the diaphragm pump includes micromotor, the reduction gearing rotated coaxially with micromotor and reducing gear
Take turns the cam pack of engagement, and the idler wheel between cam pack and active diaphragm；Drive of the idler wheel in cam pack
Move back and forth active diaphragm under dynamic.
Further, the active diaphragm and driven diaphragm are made of rubber outer ring and the plastic sheet being fixed in circle,
Flexible part support between two plastic sheets and partition.
Further, the pressure sensor is integrated with two-way air vent valve injection molding.
Beneficial effects of the present invention:
Universal vehicle-mounted fuel systems leak detecting device of the present invention includes that diaphragm pump, two-way air vent valve and pressure pass
Sensor, after the present apparatus is connected to ECU detection instruction, diaphragm pump, which is powered, starts to work, and positive pressure passes through two-way air vent valve distribution and transmission
To driven diaphragm area, fuel system is closed, then negative pressure extracts air out of fuel system, and pressure sensor is by Fuel System
Pressure signal in system feeds back to ECU, and whether ECU, which compares it and reach, presets pressure, if reach preset pressure if send out
Power-off signal out, diaphragm pump are automatically ineffective.Pass through the pressure change in monitoring pressure inductor, it can be determined that fuel system
Whether leakage is had.
Universal vehicle-mounted fuel systems leak detecting device of the present invention, can will be electrical by the isolation of rubber diaphragm
Part and fuel-steam part are kept completely separate, and the device is safer reliable.
The pressure generating source of universal vehicle-mounted fuel systems leak detecting device of the present invention is a diaphragm micropump pump,
Detection device is integrated pressure sensor, and structure is simple, manufacturing cost is cheap.
Detection device of the present invention can be used for substituting pressure sensor and CVS valve on regular fuel vehicle, it can also be used to
DMTL and ELCM system function is substituted on PHEV vehicle.It is mutually freely replaced between different automobile types, does not need to adjust OBD calibration repeatedly
Program and strategy can greatly reduce the development cycle of new model.
Detailed description of the invention
Fig. 1 is the axis side schematic diagram of universal vehicle-mounted fuel systems leak detecting device of the present invention；
Fig. 2 is the schematic diagram in Fig. 1 along A-A section；
Fig. 3 is the schematic diagram in Fig. 1 along B-B section；
Fig. 4 is the cross-sectional view of diaphragm pump of the present invention；
The structural schematic diagram of the position Fig. 5 lid of the present invention, axis and the first relief hole；
Fig. 6 is the cooperation figure of lid of the present invention and dust cover；
Fig. 7 is the enlarged drawing in Fig. 3 at C；
Fig. 8 is the gas flow schematic diagram of universal vehicle-mounted fuel systems leak detecting device of the present invention under normal conditions；
Fig. 9 be universal vehicle-mounted fuel systems leak detecting device of the present invention detect when gas flow schematic diagram it
One；
Figure 10 is gas flow schematic diagram when universal vehicle-mounted fuel systems leak detecting device of the present invention detects
Two；
In figure: diaphragm pump 100；Active diaphragm 110；Micromotor 121；Micromotor PIN needle a 122；Micromotor PIN
Needle b 123；Reduction gearing 130；Cam pack 140；Cam wheel 141；Cam 142；Idler wheel 151；Rolling wheel support 152；Pin shaft
153；Motor interface 160；
Two-way air vent valve 200；First chamber 201；Second chamber 202；First air flue 203；Second air flue 204；Third chamber
Room 205；Valve body 210；Exhaust valve cap 220；Lid 221；Axis 222, dust cover 223；Dustproof cover 223；Porous dustproof cover 224,
One relief hole 225；Second relief hole 226；Scale 227；Pointer 228；Filter sponge 229；Driven diaphragm 230；Partition 240；The
One spring 241；Second spring 242；Third venthole 243；First check valve 250；Second one-way valve 260；Sealing ring 270；Charcoal
Tank interface 280；Grey filter interface 290；
Pressure sensor 300；Pressure chip 310；Pressure chip PIN needle a 321；Pressure chip PIN needle b 322；Pressure
Chip PIN needle c 323；Pressure port 330；Sensor interface 340.
Specific embodiment
Below in conjunction with the attached drawing performance that the present invention will be described in detail, but they are not constituted a limitation of the invention, and are only made
Citing.By specific embodiment, the present invention is described in further detail simultaneously.
Universal vehicle-mounted fuel systems leak detecting device as shown in figs 1-9 includes diaphragm pump 100, two-way air vent valve
200 and pressure sensor 300.
As shown in Figs 1-4, the upper surface of the diaphragm pump 100 is equipped with active diaphragm 110, and assembled inside has micromotor
120, reduction gearing 130, cam pack 140 and the idler wheel 151 rotated coaxially with micromotor 120.On the micromotor 120
It is equipped with PIN needle a121 and micromotor PIN needle b122, micromotor PIN needle a 121 and micromotor PIN needle b 122 and electricity
Machine interface 160 is electrically connected.The cam pack 140 includes cam wheel 141 and cam 142, the cam wheel 141 and deceleration
Gear 130 engages, and is rotated by camshaft band moving cam 142.The idler wheel 151 be set to cam 142 and active diaphragm 110 it
Between, it can be fixed on the rolling wheel support 152 being connect with active diaphragm 110 by pin shaft 153.
Diaphragm pump major function in the present apparatus is to generate positive and negative pressure condition, when ECU gives leak detection instruction,
Micromotor 120 rotates, and 141 engagement rotation of coaxial cam wheel of coaxial reduction gearing 130 and cam pack 140 is convex
Rotary force is converted to up and down motion by the cam 142 of wheel assembly 140.When cam 142 runs lofty perch, pushing rolling wheels 151 are upward
Movement, stretches active diaphragm 110 into two-way air vent valve 200, in two-way air vent valve 200 with 110 involving chamber of active diaphragm
Form positive pressure；When the operation of cam 142 to low spot, idler wheel 151 is fallen, and active diaphragm 110 restores to the original state, at this time two-way air vent valve
Negative pressure is formed with 110 involving chamber of active diaphragm in 200.
As shown in Figure 1-3, the two-way air vent valve 200 includes valve body 210, exhaust valve cap 220, is set to valve body 210 and row
Driven diaphragm 230 between air valve cap 220, the canister interface 280 being oppositely arranged and grey filter interface 290.
It is equipped with partition 240 in the valve body 210, the partition 240 and driven diaphragm 230 is parallel with active diaphragm 110 sets
Set, form first chamber 201 between the active diaphragm 110 and partition 240, the driven diaphragm 230 and exhaust valve cap 220 it
Between formed second chamber 202, then form fuel system channel between the driven diaphragm 230 and partition 240.In present embodiment
In, active diaphragm 110 and driven diaphragm 230 are made of rubber outer ring and the plastic sheet being fixed in circle, the rubber outer ring
It is sulfided with plastic sheet, the thickness of rubber outer ring is between 0.2mm-0.8mm, and design has U-typed fold real
The outer edge design of the free extension of existing rubber film, rubber film has " ∞ " type seal line, can be used for two adjacent independences
Chamber.In order to preferably provide elastic pressure for plastic sheet, the first bullet is assembled between the active diaphragm 110 and partition 240
Spring 241 is assembled with second spring 242 between the driven diaphragm 230 and partition 240.
As shown in Figures 2 and 3, the fuel system channel is by the first air flue 203, the second air flue 204 and third chamber 205
Composition.The both ends of the third chamber 205 are connect with driven diaphragm 230 and partition 240 respectively, the side of the third chamber 205
Wall is then connected to grey filter interface 290.Second air flue 204 is located in third chamber 205, and second air flue 204 is three
Air passage, one end and driven diaphragm 230 keep elastic distance, the other end to be connected to first chamber 201, the opening on side wall then with
Canister interface 280 is connected to.And first air flue 203 be two air passages, both ends respectively with first chamber 201 and second chamber
202 connections.
First air flue 203 is located at the side in fuel system channel, one end of first air flue 203 and driven diaphragm
230 connections, the other end and partition 240 connect, the driven diaphragm 230 correspond to the place open at one end of the first air flue 203 be equipped with from
Dynamic fenestra, corresponding first air flue, 203 other end opening of the partition 240 are equipped with first through hole.Second air flue 204 is located at
The other end at the middle part in fuel system channel, second air flue 204 is connect with partition 240, and the partition 240 corresponds to second
204 other end opening of air flue is equipped with the second through-hole.
First air flue 203 is equipped with the first ventilation that gas can be made to be reached in second chamber 202 from first chamber 201
Valve 250, second air flue 204 are equipped with the second breather valve 260 that gas can be made to be reached in first chamber 201 from canister.?
In the present embodiment, first breather valve 250 is duckbill valve, can be formed by vulcanizations of rubber such as NBR, NBR+PVC or FKM, institute
Duckbill valve is stated to be inserted into the first air flue 203 across first through hole.When diaphragm pump generates positive pressure, duckbill valve is opened, and gas is from the
One chamber 201 enters the first air flue 203 and further reaches second chamber 202；When negative pressure state, two pieces of sheet rubbers of duckbilled are tight
Closely connected conjunction, gas can not pass through.In the present embodiment, second breather valve 260 is umbrella valve, also can be by NBR, NBR+PVC
Or the vulcanizations of rubber such as FKM form, the bright portion of the umbrella valve passes through the second through-hole and is inserted into the second air flue 204, and umbrella cover edge is
Sealing surface, the partition 240 correspond to umbrella cover position at opened up multiple third ventholes 243.When being positive in first chamber
When pressure, umbrella cover edge fits in 260 surface of partition, and air-flow can not pass through；When in first chamber being negative pressure, air-flow is from the second gas
Road reaches first chamber by umbrella valve.
As shown in figure 5, the exhaust valve cap 220 includes lid 221, the axis 222 for being located at 221 top of lid, is socketed in axis
The dust cover 223 that can be rotated around axis 222 on 222, and it is mounted on the porous dustproof cover 224 at 223 top of dust cover；The lid
221 tops are equipped with the first relief hole 225 at paraxial 222, and the dust cover 223 is equipped with to cooperate with the first relief hole 225 and adjust
Second relief hole 226 of gas output.Dust cover 223 is rotated, between adjustable first relief hole 225 and the second relief hole 226
The exhaust hole area formed is overlapped, to control the response time that driven diaphragm 230 opens and closes fuel system.For convenience
It adjusts, lid 221, which corresponds at 223 periphery of dust cover, is equipped with scale 227, and the dust cover 222, which is equipped with, may be used to indicate scale
227 pointer 228, turns to different angle and represents different area.To avoid dust from entering, it is additionally provided in the dust cover 223
Filter sponge 229.
As shown in figs. 3 and 6, pressure sensor 300 is directly integrated with the injection molding of valve body 210, does not need in addition to connect, and is wrapped
Induction chip 310 and PIN needle foot are included, the PIN needle foot is directly welded with induction chip corresponding contacts together, outer end and sensor
Interface 340 connects.In the present embodiment, in the downside of partition 240, pressure port 330 is set to for 300 integration of pressure sensor
In canister interface 280, specifically, it is located at partition 240 and corresponds at the position of canister interface 280.
Major function of the pressure sensor in the present apparatus is that pressure in fuel evaporation control system is converted to electricity
Signal is transferred in ECU, and ECU can compare signal intensity curvature or trend and datum curve, when trend is identical or close
Then judge system No leakage, it is on the contrary then judge to leak.
Working method:
Under normality, as shown in fig. 7, universal vehicle-mounted fuel systems leak detecting device of the present invention is unimpeded, the second gas
Road 204 and the separated state of driven diaphragm 230, the gas between canister and grey filter is in the second air flue 204 and third chamber 205
Between normal through and exchange.
After ECU system provides detection instruction, diaphragm pump 100 works, and the positive pressure that diaphragm pump generates makes 110 grams of active diaphragm
The elastic force for taking the first spring 141 moves up, and first chamber 201 forms positive pressure, when being more than the cracking pressure of duckbill valve 250,
Positive pressure in first chamber 201 is transferred in second chamber 202 by the first air flue 203, as driven diaphragm 230 is by positive pressure
Constantly enhancing, a small amount of gas are escaped from exhaust valve cap 220, the pressure of most of gas, as shown in figure 8, can promote driven diaphragm
230 overcome the elastic force of second spring 142 to move down, until driven diaphragm 230 compresses another end opening of the second air flue 204,
To increase air-tightness, another mountable sealing ring 270 of end opening, the airflow channel between canister and ash filter is fully disconnected at this time.
When diaphragm pump is operated to negative pressure, negative pressure is formed in first chamber 201, when being more than the cracking pressure of umbrella valve 260,
As shown in fig. 7, the present apparatus extracts gas by canister out of fuel evaporation control system, pressure sensor will be in fuel system
Pressure signal feeds back to ECU, and when pressure signal, which reaches, presets pressure, ECU issues power-off signal diaphragm pump and is automatically stopped
Work, driven diaphragm 230 are unable to get lasting positive pressure, and air pressure can work as second chamber by 220 sustained release of exhaust valve cap
When air pressure and atmospheric pressure gradually balance in 202, the elastic force of second spring 142 makes driven diaphragm 230 be detached from sealing ring 270, restores
Deformation, canister are connected to completely with ash filter.In entire detection process monitor pressure sensor in pressure change, by with standard
The comparison of pressure curve may determine that whether fuel system has leakage.
The content that this specification is not described in detail belongs to the prior art well known to professional and technical personnel in the field.
Claims (10)
1. universal vehicle-mounted fuel systems leak detecting device, it is characterised in that: the diaphragm pump including being equipped with active diaphragm (110)
(100), two-way air vent valve (200), and be located in two-way air vent valve (200) for measuring the pressure sensing of fuel system pressure
Device (300)；
The two-way air vent valve (200) includes valve body (210), exhaust valve cap (220), and is set to valve body (210) and exhaust valve
Cover the driven diaphragm (230) between (220)；Partition (240), the partition (240) and driven membrane are equipped in the valve body (210)
Piece (230) is arranged in parallel with active diaphragm (110), forms first chamber between the active diaphragm (110) and partition (240)
(201), second chamber (202) are formed between the driven diaphragm (230) and exhaust valve cap (220), the driven diaphragm (230)
Fuel system channel is then formed between partition (240)；
The fuel system channel is connected to by the first air flue (203), the second air flue (204) being connected to canister and with grey filter
Third chamber (205) composition；The both ends of the third chamber (205) are connect with driven diaphragm (230) and partition (240) respectively,
Second air flue (204) is located in third chamber (205) and one end and driven diaphragm (230) keep elastic distance, described
The other end of second air flue (204) is connected to first chamber (201), and the both ends of first air flue (203) are then respectively with
One chamber (201) is connected to second chamber (202), and first air flue (203), which is equipped with, can make gas from first chamber (201)
The first check valve (250) in second chamber (202) is reached, second air flue (204), which is equipped with, can be such that gas passes from canister
Second one-way valve (260) in first chamber (201).
2. universal vehicle-mounted fuel systems leak detecting device according to claim 1, it is characterised in that: first gas
Road (203) is located at the side in fuel system channel, and one end of first air flue (203) connect with driven diaphragm (230), is another
End is connect with partition (240), and corresponding first air flue (203) place open at one end of driven diaphragm (230) is equipped with driven fenestra, institute
It states partition (240) and is equipped with first through hole corresponding to the first air flue (203) other end opening.
3. universal vehicle-mounted fuel systems leak detecting device according to claim 2, it is characterised in that: second gas
Road (204) is located at the middle part in fuel system channel, and the other end of second air flue (204) is connect with partition (240), it is described every
Plate (240) corresponds to the second air flue (204) other end opening and is equipped with the second through-hole.
4. universal vehicle-mounted fuel systems leak detecting device according to claim 3, it is characterised in that: described first is single
It is duckbill valve to valve (250), the duckbill valve passes through first through hole and is inserted into the first air flue (203)；The second one-way valve
It (260) is umbrella valve, the bright portion of the umbrella valve passes through the second through-hole and is inserted into the second air flue (204), and the partition (240) is corresponding
Multiple third ventholes (243) are offered at the umbrella cover position of umbrella valve.
5. universal vehicle-mounted fuel systems leak detecting device described in any one of -4 according to claim 1, it is characterised in that:
The two-way air vent valve (200) further includes canister interface (280) and grey filter interface (290)；The two of the canister interface (280)
End connect respectively with canister atmospheric air port and the second air flue (204) side wall, and it is described ash filter interface (290) both ends then respectively with
Grey filter is connected with third chamber (205) side wall, and the pressure port (330) of the pressure sensor (300) is set to canister interface
(280) in.
6. universal vehicle-mounted fuel systems leak detecting device according to claim 5, it is characterised in that: the exhaust valve
Lid (220) includes lid (221), the axis (222) being located at the top of lid (221), is socketed on axis (222) and can revolve around axis (222)
The dust cover (223) turned, and it is mounted on the porous dustproof cover (224) at the top of dust cover (223)；At the top of the lid (221)
The first relief hole (225) are equipped at paraxial (222), the dust cover (223) is equipped with to cooperate with the first relief hole (225) and adjust
The second relief hole (226) of gas output.
7. universal vehicle-mounted fuel systems leak detecting device according to claim 6, it is characterised in that: the lid
(221) correspond at dust cover (223) periphery and be equipped with scale (227), the dust cover (222), which is equipped with, may be used to indicate scale
(227) pointer (228).
8. universal vehicle-mounted fuel systems leak detecting device according to claim 6 or 7, it is characterised in that: the film
Piece pump (100) includes micromotor (120) and reduction gearing (130) and reduction gearing that micromotor (120) rotate coaxially
(130) cam pack (140) engaged, and the idler wheel (151) being set between cam pack (140) and active diaphragm (110)；
The idler wheel (151) moves back and forth active diaphragm (110) under the driving of cam pack (140).
9. universal vehicle-mounted fuel systems leak detecting device according to claim 8, it is characterised in that: the active film
Piece (110) and driven diaphragm (230) be made ofs rubber outer ring and the plastic sheet being fixed in circle, two plastic sheets and every
Flexible part support between plate (240).
10. universal vehicle-mounted fuel systems leak detecting device according to claim 9, it is characterised in that: the pressure
Sensor (300) is integrated with two-way air vent valve (200) injection molding.
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| CN201811544868.2A CN109538945B (en) | 2018-12-17 | 2018-12-17 | Universal type vehicle-mounted fuel system leakage detection device |
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| CN201811544868.2A CN109538945B (en) | 2018-12-17 | 2018-12-17 | Universal type vehicle-mounted fuel system leakage detection device |
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| CN109538945B CN109538945B (en) | 2023-10-27 |
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| CN113685291A (en) * | 2021-08-03 | 2021-11-23 | 东风富士汤姆森调温器有限公司 | Oil tank isolating valve |
| WO2023208796A1 (en) * | 2022-04-28 | 2023-11-02 | Thomas Magnete Gmbh | Leakage diagnosis method and leakage diagnosis system for a tank of a vehicle |
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| CN109538945B (en) | 2023-10-27 |
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