CN109752028A - Gasoline car fuel tank cap opens positive pressure detection method - Google Patents
Gasoline car fuel tank cap opens positive pressure detection method Download PDFInfo
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- CN109752028A CN109752028A CN201811640630.XA CN201811640630A CN109752028A CN 109752028 A CN109752028 A CN 109752028A CN 201811640630 A CN201811640630 A CN 201811640630A CN 109752028 A CN109752028 A CN 109752028A
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- air pump
- fuel tank
- canister
- electric current
- gasoline car
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- Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
Abstract
The present invention relates to a kind of gasoline car fuel tank cap to open positive pressure detection method, it is connect it is characterized by: pipeline is desorbed by steam in the steam port of fuel tank with the desorption mouth of gasoline car canister, the switching signal end of the canister desorption valve of gasoline car canister is connect with on-line monitoring module, air pump is connect with the atmospheric air port of gasoline car canister, the power supply signal end of air pump is connect with on-line monitoring module, and the outlet end of air pump connects air cleaner；Specific detecting step is as follows: 1) closing canister and valve is desorbed；2) air pump is opened；3) air pump electric current is measured；4) filtered air pump electric current is compared with threshold value, if filtered air pump electric current is lower than threshold value, illustrates that fuel tank cap is in the open state.It uses air pump motor electric current low-pass filter value to carry out the judgement of fuel tank cap open state, and algorithm is simple, has very high detection accuracy and detection efficiency.
Description
Technical field
The present invention relates to a kind of gasoline car fuel tank cap to open positive pressure detection method, is applied particularly to gasoline car onboard diagnostics
(OBD) system evaporative pollutants emission control technique field.
Background technique
Onboard diagnostics (OBD) system by using vehicle-mounted computer monitoring vehicle exhaust system in actual use work shape
Condition, and the failure of exhaust system can be monitored.The performance that OBD system passes through monitoring exhaust system, it is ensured that be effectively controlled with starting
The discharge of machine." Light-duty Vehicle pollutant emission limit and measurement method (Chinese 6th stage) " requires OBD system to have evaporation system
The function of system leakage monitoring.If the fuel tank drowning of vehicle is tightened or fuel tank cap missing will cause a large amount of fuel-steam leakage
Environment is polluted into atmosphere, therefore the fuel tank drowning for monitoring vehicle is tightened or fuel tank cap lacks and gives driver and effectively mentions
Pollution of the vehicle EVAP evaporative emission to atmospheric environment can effectively be reduced by waking up.
Patent CN201620549191.1(publication number: CN205661310U, publication date: 2016.10.26) disclose one kind
Can self-sealing energy-efficient fuel loading system.But it is not directed to oil tank system sealing propertytest and the detection of fuel tank cap open state etc.
Function.Patent CN201510503479.5(publication number: CN105041527A, publication date: 2015.11.11) disclose a kind of vehicle
Fuel delivery and vapo(u)rization system, the invention can prevent from continuing fuel up after jumping rifle and can be avoided liquid in fuel tank to fire
Oil stream, which enters canister, leads to that canister is vulnerable, fuel-steam is volatile into atmosphere.The invention does not consider that fuel tank is revealed yet
The problems such as detection and fuel tank cap are opened.Patent CN201510759133.1(notification number: CN105257432A, publication date: 2016-
A kind of vehicle-mounted fuel-oil vaporization controlling device with automatically controlled temperature adjustment function 01-20) is disclosed, sharp again with fuel-steam recycling
With arranging resistance wire in the charcoal canister of function.The invention can prevent the fuel-steam generated in fuel tank in refueling process direct
It is discharged to atmosphere, the same invention is not directed to the function of leak detection and fuel tank cap open detection.Patent
CN201510597607.7(notification number: CN105156210A, publication date: 2015-12-16) pass through ECU control engine, leakage
Detection intelligent object and leak detection air pump module can be realized the leak detection to fuel tank evaporative emissions system, still
The unlatching of oil tank of vehicle lid is not directed to.The present invention is for fuel tank cap open detection techno-absence during evaporation leak detection
The case where, fuel tank cap open state detection method is provided, reduces fuel tank unlatching and causes evaporative pollutants to atmospheric environment
Pollution.
Summary of the invention
The object of the present invention is to provide a kind of gasoline car fuel tank cap to open positive pressure detection method, passes through air pump to fuel tank
Interior pressurization inflation simultaneously acquires the real-time current of air pump simultaneously, and fuel tank internal pressure is reacted in the air pump load of air pump current response
The situation of change of power；Using the variation of vehicle-mounted computer monitoring air pump electric current, and the gradient of air pump curent change is calculated in real time.
The gradient changed by tank pressure is to determine whether there are fuel tank cap unlatchings.The present invention can detect vapour in a short time
Oily vehicle fuel tank cap open state.Accurate prompting can be obtained by driver of the present invention, thus the effective vehicle that reduces evaporates
Pollution of the emission to atmospheric environment.
The technical scheme of the present invention is realized as follows: a kind of gasoline car fuel tank cap opens positive pressure detection method, gasoline car
Case lid opens the hardware components of positive pressure detection, by air cleaner, air pump, gasoline car canister, canister desorption valve, on-line monitoring
Module, fuel tank composition, it is characterised in that: the steam port of fuel tank is connected by the desorption mouth that pipeline and gasoline car canister is desorbed in steam
It connects, the switching signal end of the canister desorption valve of gasoline car canister is connect with on-line monitoring module, air pump and gasoline car canister
The power supply signal end of atmospheric air port connection, air pump is connect with on-line monitoring module, and the outlet end of air pump connects air cleaner；
Specific detecting step is as follows:
1) it closes canister and valve is desorbed, on-line monitoring module controls and closes canister desorption valve, makes entering fuel tank just from air pump
Body of calming the anger will not be desorbed valve from canister and flow into inlet manifold, to form the pipeline liquid injecting device from air pump to fuel tank；
2) open air pump, on-line monitoring module, which opens air pump, makes ambient atmosphere by air cleaner, air pump, canister into
Enter into fuel tank；
3) air pump electric current is measured, monitors the electric current of module real-time measurement air pump on-line, and air pump electric current is filtered,
According to formulay(k+1) = αx(k)+(1-α)y(k) to air pump current filtering, whereinx(k) indicatekThe input of moment filter
Electric current,y(k) representkMoment filter to output current is filter factor,αValue is (0,1), and the specific selection of value needs basis
Fuel system is demarcated；
4) filtered air pump electric current is compared to (air when threshold value is not tightened according to the practical fuel tank cap of acquisition with threshold value
Pump electric current is configured), which is influenced by the structure of the components such as fuel tank, oil filling pipe and oil filler, and actual measurement is needed to demarcate；
If filtered air pump electric current is lower than threshold value, illustrate that fuel tank cap is in the open state.
The positive effect of the present invention is that it uses air pump motor electric current low-pass filter value progress fuel tank cap open state to sentence
Fixed, algorithm is simple, has very high detection accuracy and detection efficiency.
Detailed description of the invention
Fig. 1 show heretofore described fuel tank cap open state detection system structure.1- air cleaner,
2- air pump, 3- gasoline car canister, 4- canister desorption valve, 5- monitor module, 6- fuel tank on-line.
Fig. 2 show gasoline car fuel tank cap and opens positive pressure detection method flow diagram.
Specific embodiment
The present invention is described in detail below with reference to the accompanying drawings and embodiments: as shown in Figs. 1-2, a kind of gasoline car fuel tank
Lid opens positive pressure detection method, and gasoline deck lid opens the hardware components of positive pressure detection, by air cleaner 1, air pump 2, vapour
Oily vehicle canister 3, canister desorption valve 4, on-line monitoring module 5, fuel tank 6 form, it is characterised in that: the steam port of fuel tank 6 passes through steaming
Vapour desorption pipeline connect with the desorption mouth of gasoline car canister 3, the canister of gasoline car canister 3 be desorbed valve 4 switching signal end and
Line monitoring modular 5 connects, and air pump 2 is connect with the atmospheric air port of gasoline car canister 3, the power supply signal end of air pump 2 and online prison
It surveys module 5 to connect, the outlet end of air pump 2 connects air cleaner 1；Specific detecting step is as follows:
1) it closes canister and valve is desorbed, on-line monitoring module 5 controls and closes canister desorption valve 4, makes to enter fuel tank from air pump
Barotropic gas will not be desorbed valve from canister and flow into inlet manifold, to form the pipeline liquid injecting device from air pump to fuel tank；
2) air pump is opened, on-line monitoring module 5, which opens air pump, makes ambient atmosphere pass through air cleaner 1, air pump 2, carbon
Tank 3 enters in fuel tank 6；
3) air pump electric current is measured, monitors the electric current of 5 real-time measurement air pump of module on-line, and air pump electric current is filtered
Wave, according to formulay(k+1) = αx(k)+(1-α)y(k) to air pump current filtering, whereinx(k) indicatekMoment filter is defeated
Enter electric current,y(k) representkMoment filter to output current is filter factor,αValue is (0,1), and the specific selection of value needs root
It is demarcated according to fuel system；
4) filtered air pump electric current is compared to (air when threshold value is not tightened according to the practical fuel tank cap of acquisition with threshold value
Pump electric current is configured), which is influenced by the structure of the components such as fuel tank, oil filling pipe and oil filler, and actual measurement is needed to demarcate；
If filtered air pump electric current is lower than threshold value, illustrate that fuel tank cap is in the open state.
As shown in Figure 1, the present invention utilizes air pump and the detection opened to fuel tank cap.Air pump is driven by motor, and makees
With being to be pumped into air into vapo(u)rization system；The air pump motor electric current of acquisition at this time when carrying out fuel tank cap open detection.
By air pump to gas is pumped in fuel tank, so that tank pressure rises, the size of air pump motor electric current is indirectly anti-
The case where tank pressure rises is mirrored, to assess the airtightness of fuel tank.If fuel tank is closed system, in air pump
Tank pressure rises when work, and air pump electric current quickly increases；If oil tank system has leakage, tank pressure rises
It is relatively fewer, pump the raised amplitude reduction of electric current.If but fuel tank cap unlatching in the detection process, pump electric current can also be kept very
It is small.
Fig. 2 is the implementation process and control flow chart of fuel tank cap open detection.Correlated inputs information, such as battery are obtained first
The electric current of voltage and air pump motor；Judge battery voltage ripple range, evaporation leakage is interrupted if battery voltage ripple is excessive
Detection process calculates pump motor current correction factor according to cell voltage if fluctuation is normal；According to input pump motor current and
Pump motor current after amendment is calculated in correction factor；Low-pass filtering is carried out to electric current after amendment, if electric current exceeds threshold after filtering
Value determines that vehicle is in fuel tank cap unlatching.
Claims (1)
1. a kind of gasoline car fuel tank cap opens positive pressure detection method, gasoline deck lid opens the hardware components of positive pressure detection, by sky
Air cleaner, air pump, gasoline car canister, canister desorption valve, on-line monitoring module, fuel tank composition, it is characterised in that: fuel tank
Steam port is desorbed pipeline by steam and connect with the desorption mouth of gasoline car canister, the switch letter of the canister desorption valve of gasoline car canister
Number end with on-line monitoring module connect, air pump is connect with the atmospheric air port of gasoline car canister, the power supply signal end of air pump and
The outlet end of the connection of line monitoring modular, air pump connects air cleaner；Specific detecting step is as follows:
1) it closes canister and valve is desorbed, on-line monitoring module controls and closes canister desorption valve, makes entering fuel tank just from air pump
Body of calming the anger will not be desorbed valve from canister and flow into inlet manifold, to form the pipeline liquid injecting device from air pump to fuel tank；
2) open air pump, on-line monitoring module, which opens air pump, makes ambient atmosphere by air cleaner, air pump, canister into
Enter into fuel tank；
3) air pump electric current is measured, monitors the electric current of module real-time measurement air pump on-line, and air pump electric current is filtered
Wave, according to formulay(k+1) = αx(k)+(1-α)y(k) to air pump current filtering, whereinx(k) indicatekMoment filter is defeated
Enter electric current,y(k) representkMoment filter to output current is filter factor,αValue is (0,1), and the specific selection of value needs root
It is demarcated according to fuel system；
4) filtered air pump electric current is compared with threshold value, threshold value is according to the sky acquired when practical fuel tank cap is not tightened
Air pump electric current is configured, if filtered air pump electric current is lower than threshold value, illustrates that fuel tank cap is in the open state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811640630.XA CN109752028A (en) | 2018-12-29 | 2018-12-29 | Gasoline car fuel tank cap opens positive pressure detection method |
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| CN201811640630.XA CN109752028A (en) | 2018-12-29 | 2018-12-29 | Gasoline car fuel tank cap opens positive pressure detection method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110774889A (en) * | 2019-10-25 | 2020-02-11 | 吉利汽车研究院（宁波）有限公司 | Method and system for detecting whether fuel tank cover is closed or not and automobile |
| CN113417765A (en) * | 2021-06-22 | 2021-09-21 | 浙江吉利控股集团有限公司 | Positive pressure detection device and method and vehicle comprising positive pressure detection device |
| CN113654576A (en) * | 2021-07-02 | 2021-11-16 | 华人运通(江苏)技术有限公司 | Four-way valve position identification method and system based on water pump current |
| CN113654741A (en) * | 2021-08-27 | 2021-11-16 | 浙江机电职业技术学院 | Automatic monitoring and early warning system and monitoring method for sealing performance of power battery pack |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110774889A (en) * | 2019-10-25 | 2020-02-11 | 吉利汽车研究院（宁波）有限公司 | Method and system for detecting whether fuel tank cover is closed or not and automobile |
| CN113417765A (en) * | 2021-06-22 | 2021-09-21 | 浙江吉利控股集团有限公司 | Positive pressure detection device and method and vehicle comprising positive pressure detection device |
| CN113654576A (en) * | 2021-07-02 | 2021-11-16 | 华人运通(江苏)技术有限公司 | Four-way valve position identification method and system based on water pump current |
| CN113654576B (en) * | 2021-07-02 | 2023-12-19 | 华人运通(江苏)技术有限公司 | Four-way valve position identification method and system based on water pump current |
| CN113654741A (en) * | 2021-08-27 | 2021-11-16 | 浙江机电职业技术学院 | Automatic monitoring and early warning system and monitoring method for sealing performance of power battery pack |
| CN113654741B (en) * | 2021-08-27 | 2024-02-09 | 浙江机电职业技术学院 | Automatic monitoring and early warning system and monitoring method for tightness of power battery pack |
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Application publication date: 20190514 |