CN209431100U - Universal vehicle-mounted fuel systems leak detecting device - Google Patents

Abstract

The utility model 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 described in the utility model is simple, using safe, verification and measurement ratio is high, cost performance is high.

Description

Universal vehicle-mounted fuel systems leak detecting device

Technical field

The utility model belongs to fuel evaporation control system field, and in particular to universal vehicle-mounted fuel systems leak detection Device.

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.

Utility model content

The purpose of the utility model is to overcome problems of the prior art, provide a kind of universal vehicle-mounted Fuel System It unites leak detecting device, it is structurally reasonable, cost is relatively low, it can both be used in regular fuel vehicle or in PHEV vehicle Upper use.

It includes the diaphragm equipped with active diaphragm that the utility model, which provides universal vehicle-mounted fuel systems leak detecting device, Pump, two-way air vent valve, and be 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.

The utility model has the beneficial effects that

Universal vehicle-mounted fuel systems leak detecting device described in the utility model includes diaphragm pump, two-way air vent valve and pressure Force snesor, after the present apparatus is connected to ECU detection instruction, diaphragm pump, which is powered, starts to work, and positive pressure is distributed by two-way air vent valve It is transmitted to driven diaphragm area, fuel system is closed, then negative pressure extracts air out of fuel system, and pressure sensor will fire Pressure signal in oil system feeds back to ECU, and whether ECU, which compares it and reach, presets pressure, presets pressure if reaching Power-off signal is then issued, diaphragm pump is automatically ineffective.Pass through the pressure change in monitoring pressure inductor, it can be determined that fuel oil Whether system has leakage.

Universal vehicle-mounted fuel systems leak detecting device described in the utility model can be incited somebody to action by the isolation of rubber diaphragm Electric 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 described in the utility model is a miniature film Piece pump, detection device is integrated pressure sensor, and structure is simple, manufacturing cost is cheap.

Detection device described in the utility model can be used for substituting pressure sensor and CVS valve on regular fuel vehicle, it is also possible to In substitution DMTL and ELCM system function on PHEV vehicle.It is mutually freely replaced between different automobile types, does not need to adjust OBD mark repeatedly Determine program and strategy, the development cycle of new model can be greatly reduced.

Detailed description of the invention

Fig. 1 is the axis side schematic diagram of universal vehicle-mounted fuel systems leak detecting device described in the utility model；

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 described in the utility model；

The structural schematic diagram of the position Fig. 5 lid described in the utility model, axis and the first relief hole；

Fig. 6 is the cooperation figure of lid described in the utility model and dust cover；

Fig. 7 is the enlarged drawing in Fig. 3 at C；

Fig. 8 is that the gas of universal vehicle-mounted fuel systems leak detecting device described in the utility model under normal conditions flows signal Figure；

Fig. 9 is that gas when universal vehicle-mounted fuel systems leak detecting device described in the utility model detects flows signal One of figure；

Figure 10 is that gas flowing when universal vehicle-mounted fuel systems leak detecting device described in the utility model detects is shown The two of intention；

In figure: diaphragm pump 100；Active diaphragm 110；Micromotor 121；Micromotor PIN needle a 122；Micromotor PIN needle b123；Reduction gearing 130；Cam pack 140；Cam wheel 141；Cam 142；Idler wheel 151；Rolling wheel support 152；Pin Axis 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；Porous dustproof cover 224, the first relief hole 225；Second relief hole 226；Scale 227；Pointer 228；Filter sponge 229；Driven diaphragm 230；Partition 240；First spring 241；Second spring 242；Third venthole 243；First check valve 250；Second one-way valve 260；Sealing ring 270；Canister 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

The performance of the utility model is described in detail below in conjunction with attached drawing, but they do not constitute the limit to the utility model It is fixed, it is only for example.The utility model is described in further detail by specific embodiment 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 b122 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 When, micromotor 120 rotates, and coaxial reduction gearing 130 is engaged with the coaxial cam wheel 141 of cam pack 140 to be turned Dynamic, rotary force is converted to up and down motion by the cam 142 of cam pack 140.When cam 142 runs lofty perch, pushing rolling wheels 151 It moves upwards, stretches active diaphragm 110 into two-way air vent valve 200, it is related to active diaphragm 110 in two-way air vent valve 200 Chamber forms 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, two-way ventilation at this time Negative pressure is formed with 110 involving chamber of active diaphragm in valve 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 this embodiment party In formula, active diaphragm 110 and driven diaphragm 230 are made of rubber outer ring and the plastic sheet being fixed in circle, outside the rubber Circle is sulfided with plastic sheet, and the thickness of rubber outer ring is between 0.2mm-0.8mm, and design has U-typed fold can It realizes that the free extension of rubber film, the outer edge design of rubber film have " ∞ " type seal line, can be used for two adjacent only Vertical chamber.In order to preferably provide elastic pressure for plastic sheet, first 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 membrane The connection of piece 230, the other end and partition 240 connect, and the driven diaphragm 230 corresponds to the place open at one end of the first air flue 203 and is equipped with Driven fenestra, corresponding first air flue, 203 other end opening of the partition 240 are equipped with first through hole.Second air flue 204 The other end in the middle part in fuel system channel, second air flue 204 is connect with partition 240, and the partition 240 corresponds to the Two air flues, 204 other end opening 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 Save the second relief hole 226 of gas output.Rotate dust cover 223, adjustable first relief hole 225 and the second relief hole 226 it Between overlap the exhaust hole area of formation, to control the response time that driven diaphragm 230 opens and closes fuel system.For side Just 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 quarter The pointer 228 of degree 227, turns to different angle and represents different area.To avoid dust from entering, also set in the dust cover 223 There is filtering 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 described in the utility model is unimpeded, the Two air flues 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 Between room 205 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 just 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 membrane Piece 230 overcomes the elastic force of second spring 142 to move down, until the other end that driven diaphragm 230 compresses the second air flue 204 is opened Mouthful, to increase air-tightness, another mountable sealing ring 270 of end opening, the airflow channel between canister and ash filter is completely disconnected at this time It opens.

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 (223), 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.