CN106500933B - Diagnosis method of high pressure fuel tank leakage - Google Patents

Diagnosis method of high pressure fuel tank leakage Download PDF

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Publication number
CN106500933B
CN106500933B CN201611223301.6A CN201611223301A CN106500933B CN 106500933 B CN106500933 B CN 106500933B CN 201611223301 A CN201611223301 A CN 201611223301A CN 106500933 B CN106500933 B CN 106500933B
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pressure
fuel tank
threshold
air pump
leakage
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CN106500933A (en
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毛俊培
朱建伟
殷佳元
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SAIC Motor Corp Ltd
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SAIC Motor Corp Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
    • G01M3/32—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators
    • G01M3/3236—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators by monitoring the interior space of the containers
    • G01M3/3272—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators by monitoring the interior space of the containers for verifying the internal pressure of closed containers

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Supplying Secondary Fuel Or The Like To Fuel, Air Or Fuel-Air Mixtures (AREA)

Abstract

The present invention relates to vehicle performance test field more particularly to a kind of high pressure resistant fuel tank leakage diagnosing methods.A kind of high pressure resistant fuel tank leakage diagnosing method, determines the pressure measured value of tank pressure sensing device, when hypertonia, diagnostic mode is closed using closing, otherwise using open diagnostic mode；The open closing diagnostic mode includes opening the internal circulation inflatable of air pump progress to obtain with reference to stabling current；It opens air pump high pressure resistant fuel tank is inflated to obtain actual measurement stabling current, the high pressure resistant fuel tank of multilevel iudge has leakage；The open diagnostic method of the closing is to record tank pressure-time graph by tank pressure sensing device, judges that high pressure resistant fuel tank has leakage by rate of pressure change.The high pressure resistant fuel tank leakage diagnosing method of the present invention uses most suitable diagnostic method according to the actual pressure state selection in high pressure resistant fuel tank, substantially reduce fuel steam discharge during diagnosis, pollution is reduced, the requirement of discharge vaporization and refueling process discharge is met.

Description

High pressure resistant fuel tank leakage diagnosing method
Technical field
The present invention relates to vehicle performance test field more particularly to a kind of high pressure resistant fuel tank leakage diagnosing methods.
Background technique
As emission regulation upgrades from five-way state, state six, the technical requirements of vapo(u)rization system are increasingly improved, it is required that main It is following some:
1) diagnosis of fuel system leakage is increased newly
2) plus tight discharge vaporization requires
3) requirement of oiling process discharge is increased newly
Currently, on conventional gasoline engin vehicle, for technical requirements 1), a kind of diagnosis air pump can be used to fuel oil System (fuel tank, canister) inflation, to judge fuel system, especially fuel tank with the presence or absence of leakage.
But as oil consumption requirement is higher and higher, conventional gasoline engin is gradually unable to satisfy oil consumption requirement, therefore uses The hybrid vehicle that engine and motor drive jointly becomes increasingly popular.At present generally using a kind of resistance on hybrid electric vehicle The fuel-steam of elevated pressures can be enclosed in fuel tank by pressure-oil tank.In order to realize the purpose, in fuel tank and canister phase A controllable fuel tank isolation valve is also added on the pipeline of connection, to help the fuel-steam of high pressure being enclosed in high pressure resistant oil In case.
Due to the presence of high pressure resistant fuel tank and fuel tank isolation valve, when fuel tank isolation valve is closed, it is originally used for test fuel oil The air pump of system leak can not be inflated directly to fuel tank, and in order to diagnose fuel tank leakage purpose, in fuel tank, there are still high-pressure situations Under let out with regard to opening fuel tank isolation valve rashly and recycle air pump to be diagnosed after oil removal box pressure, then can during the pressure relief process by More fuel-steams are discharged into atmosphere, are caused centainly to pollute to environment, are unable to satisfy discharge vaporization and refueling process emission request.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of high pressure resistant fuel tank leakage diagnosing methods according to high pressure resistant oil Actual pressure state selection in case uses most suitable diagnostic method, substantially reduces fuel-steam during diagnosis and arranges It puts, reduces pollution, meet the requirement of discharge vaporization and refueling process discharge.
The present invention is implemented as follows: a kind of high pressure resistant fuel tank leakage diagnosing method, the high pressure resistant fuel tank are built-in with fuel tank Pressure sensor sets pressure threshold condition, is sentenced with pressure measured value of the pressure threshold condition to tank pressure sensing device It is fixed, when excessively high with pressure threshold condition criterion pressure measured value, using closing diagnostic mode；When with pressure threshold condition criterion When pressure measured value is normal, using open diagnostic mode；
The open diagnostic mode is after setting diagnosis current threshold, comprising the following steps:
S1. canister vent valve and fuel tank isolation valve are closed；
S2. it adjusts air pump control valve and air pump is accessed into internal circulation；
S3. it opens air pump and carries out internal circulation inflatable, record the current value as reference after the electric current of air pump is stablized Stabling current closes air pump after the completion；
S4. fuel tank isolation valve is opened；
S5. air pump control valve is adjusted to access air pump to high pressure resistant fuel tank inflated condition；
S6. it opens air pump to be inflated high pressure resistant fuel tank, records the current value conduct after the electric current of air pump is stablized Stabling current is surveyed, closes air pump after the completion；
S7. it will be compared with reference to stabling current with actual measurement stabling current, such as with reference to stabling current and actual measurement stabling current Difference be greater than diagnosis current threshold, then judge that high pressure resistant fuel tank has leakage；
The closing diagnostic method is, first setting diagnosis pressure change threshold value, then make canister vent valve and fuel tank every From valve keep in off position, by tank pressure sensing device record tank pressure-time graph, when according to tank pressure-when When the pressure change that half interval contour obtains is more than diagnosis pressure change threshold value, then judge that high pressure resistant fuel tank has leakage.
Further include that record air pump reference current is stablized the time in the step S3, further includes record air pump measured current in S6 The step of stablizing the time；It sets air pump electric current and stablizes time coefficient threshold value, when (the stable time/reference current of measured current is stablized Time) >=air pump electric current when stablizing time coefficient threshold value, then judges that high pressure resistant fuel tank has leakage.
The diagnosis pressure change threshold value is pressure drop rate threshold value or buildup time threshold value, when tank pressure- When pressure drop rate in time graph is more than pressure drop rate threshold value or tank pressure drops to used in ambient atmosphere pressure Time when being less than buildup time threshold value, then judge that high pressure resistant fuel tank has leakage.
The pressure threshold condition includes that pressure threshold and benchmark compare air pressure, when (pressure measured value-benchmark compares gas Pressure) >=pressure threshold when, determine pressure measured value it is excessively high；When (pressure measured value-benchmark compares air pressure) < pressure threshold, sentence Constant-pressure measured value is normal.
It is a standard atmospheric pressure or external ambient air pressure that the benchmark, which compares air pressure,.
The pressure threshold condition includes that pressure threshold coefficient and benchmark compare air pressure, when (pressure measured value/benchmark compares Air pressure) >=pressure threshold coefficient when, determine pressure measured value it is excessively high；When (pressure measured value/benchmark compares air pressure) < pressure threshold When value coefficient, determine that pressure measured value is normal.
It is a standard atmospheric pressure or external ambient air pressure that the benchmark, which compares air pressure,.
The high pressure resistant fuel tank leakage diagnosing method of the present invention is according to the actual pressure state selection in high pressure resistant fuel tank using most Suitable diagnostic method substantially reduces fuel steam discharge during diagnosis, reduces pollution, meet discharge vaporization and The requirement of refueling process discharge.
Detailed description of the invention
Fig. 1 is leakage diagnostic system connection figure of the present invention；
Fig. 2 is the flow diagram of the high pressure resistant fuel tank leakage diagnosing method of the present invention；
Fig. 3 is gas circuit flow schematic diagram when detecting reference value in the present invention in open diagnosis；
Fig. 4 is gas circuit flow schematic diagram when detecting measured value in the present invention in open diagnosis；
Fig. 5 is closing diagnosis gas circuit flow schematic diagram in the present invention.
In figure: 1 high pressure resistant fuel tank, 2 tank pressure sensing devices, 3 air pump control valves, 4 canister vent valves, 5 fuel tank isolation valves, 6 canisters, 7 engine controllers, 8 air pumps, 9 air filters, 10 engines.
Specific embodiment
Present invention will be further explained below with reference to specific examples.It should be understood that these embodiments are merely to illustrate the present invention Rather than it limits the scope of the invention.In addition, it should also be understood that, after having read the content of the invention stated, those skilled in the art Member can make various changes or modifications the present invention, and such equivalent forms equally fall within the application the appended claims and limited Range.
Embodiment 1
As shown in Figure 1, the leakage diagnostic system arrangement that the existing vehicle using high pressure resistant fuel tank 1 is furnished with is placed as, Tank pressure sensing device 2 is set in high pressure resistant fuel tank 1, canister 6 is in series with by pipeline between high pressure resistant fuel tank 1 and engine, Fuel tank isolation valve 5, being provided between the engine 10 and canister 6 are provided between the high pressure resistant fuel tank 1 and canister 6 Canister vent valve 4, the air pump 8 are connected in parallel in canister 6 by air pump control valve 3, are also parallel with air filter on the air inlet of air pump 8 Device 9 is to provide fresh air, and in order to meet the demand in diagnosis to the control of 8 access way of air pump, the air pump control valve 3 is logical Frequently with two position four-way solenoid valves；Above each motor unit includes tank pressure sensing device 2, air pump control valve 3, canister control Valve 4, fuel tank isolation valve 5 and air pump 8 are all controlled by the engine controller of vehicle self-carrying 7；
Such as Fig. 2, a kind of high pressure resistant fuel tank leakage diagnosing method, which is built-in with tank pressure sensing device 2, Pressure threshold condition is set, is determined with pressure measured value of the pressure threshold condition to tank pressure sensing device 2, when with pressure When threshold condition determines that pressure measured value is excessively high, using closing diagnostic mode；When with pressure threshold condition criterion pressure measured value When normal, using open diagnostic mode；
The open diagnostic mode is after setting diagnosis current threshold, comprising the following steps:
S1. canister vent valve 4 and fuel tank isolation valve 5 are closed；
S2. it adjusts air pump control valve 3 and air pump 8 is accessed into internal circulation；
S3. as shown in figure 3, opening air pump 8 carries out internal circulation inflatable, the electricity is recorded after the electric current of air pump 8 is stablized Flow valuve, which is used as, refers to stabling current, closes air pump 8 after the completion；
S4. fuel tank isolation valve 5 is opened；
S5. air pump 8 is accessed to high pressure resistant 1 inflated condition of fuel tank as shown in figure 4, adjusting air pump control valve 3, it is ensured that gas Stream can flow into high pressure resistant fuel tank 1 via air pump 8- > canister 6；
S6. it opens air pump 8 to be inflated high pressure resistant fuel tank 1, records the current value after the electric current of air pump 8 is stablized As actual measurement stabling current, air pump 8 is closed after the completion；
S7. it will be compared with reference to stabling current with actual measurement stabling current, such as with reference to stabling current and actual measurement stabling current Difference be greater than diagnosis current threshold, then judge that high pressure resistant fuel tank 1 has leakage；
The diagnosis current threshold is empirical parameter, the essence of leakage diagnostic sensitivity and each equipment according to actual needs Density sets acquirement by rule of thumb；
As shown in figure 5, the closing diagnostic method is, setting first diagnoses pressure change threshold value, then makes canister control Valve 4 and fuel tank isolation valve 5 are kept in off position, are recorded tank pressure-time graph by tank pressure sensing device 2, are worked as root When being more than diagnosis pressure change threshold value according to the pressure change that tank pressure-time graph obtains, then judge that high pressure resistant fuel tank 1 exists Leakage；The diagnosis pressure change threshold value is empirical parameter, is taken according to environment temperature, vehicle, fuel tank shape, the setting of fuel tank size ?.
It in the present invention, can be under open diagnostic mode other than the stabling current using air pump is as judgment criteria Determined using air pump from the time required for electric current is stablized is opened to, spend the time longer, illustrates that high pressure resistant fuel tank 1 is opposite It is bigger in the volume of original gas flow loop；At this point, further include the reference current stable time for recording air pump 8 in the step S3, Further include the steps that the measured current for recording air pump stablizes the time in S6；It sets air pump electric current and stablizes time coefficient threshold value, when (real Survey electric current and stablize time/reference current and stablize the time) >=air pump electric current when stablizing time coefficient threshold value, then judges high pressure resistant fuel tank 1 has leakage；The air pump electric current stablizes time coefficient threshold value according to the pipe-line system, fuel tank shape and fuel tank size of the vehicle It is configured by rule of thumb, is empirical parameter；The measured current stablizes the time, reference current stablizes the time to arrive after air pump opening Electric current required time when stablizing.
In the present embodiment, the diagnosis pressure change threshold value is determined with two ways:
One, determined by pressure drop rate threshold value；There is leakage in the too fast high pressure resistant fuel tank 1 of explanation of pressure decline. Therefore, when the pressure drop rate in tank pressure-time graph is more than pressure drop rate threshold value, then judge high pressure resistant oil There is leakage in case 1；
Two, determined by buildup time threshold value；In high pressure resistant fuel tank 1 and fixed pipe-line system itself, root One normal buildup time can be obtained by experiment according to inside and outside differential pressure；Therefore, when to drop to environment big for tank pressure When time used in air pressure is less than buildup time threshold value, then judge that high pressure resistant fuel tank 1 has leakage.
In the present invention, according to the situation of vehicle equipment of itself can using two different benchmark compare air pressure for than Whether belong to that pressure value is excessively high compared with the pressure judged in high pressure resistant fuel tank 1, and difference ratio is used according to the requirement of accuracy selection Compare compared with or using ratio；
Difference comparsion mode: the pressure threshold condition includes that pressure threshold and benchmark compare air pressure, when (pressure actual measurement Value-benchmark compares air pressure) >=pressure threshold when, determine pressure measured value it is excessively high；As (pressure measured value-benchmark compares air pressure) < When pressure threshold, determine that pressure measured value is normal.
Ratio manner of comparison: the pressure threshold condition includes that pressure threshold coefficient and benchmark compare air pressure, when (pressure is real Measured value/benchmark compares air pressure) >=pressure threshold coefficient when, determine pressure measured value it is excessively high；When (pressure measured value/benchmark compares Air pressure) < pressure threshold coefficient when, determine pressure measured value it is normal.
When being not provided with ambient pressure sensor in the vehicle or ambient pressure sensor can not work normally, one is selected A standard atmospheric pressure compares air pressure as benchmark；When being provided with ambient pressure sensor in the vehicle and can work normally, institute Stating benchmark to compare air pressure is external ambient air pressure.

Claims (7)

1.一种耐高压油箱泄漏诊断方法，该耐高压油箱(1)内置有油箱压力传感器(2)，其特征是，设定压力阈值条件，用压力阈值条件对油箱压力传感器(2)的压力实测值进行判定，当用压力阈值条件判定压力实测值过高时，采用封闭诊断方式；当用压力阈值条件判定压力实测值正常时，采用开放诊断方式；1. A method for diagnosing leakage of a high-pressure resistant fuel tank, the high-pressure resistant fuel tank (1) has a built-in fuel tank pressure sensor (2), and is characterized in that a pressure threshold condition is set, and the pressure threshold condition is used to measure the pressure of the fuel tank pressure sensor (2). The actual measured value is used to judge. When the pressure threshold condition is used to judge that the pressure measured value is too high, the closed diagnosis method is used; when the pressure threshold condition is used to judge that the pressure measured value is normal, the open diagnosis method is used; 所述开放诊断方式在设定了诊断电流阈值后，包括以下步骤：After the diagnostic current threshold is set, the open diagnostic method includes the following steps: S1.关闭炭罐控制阀(4)和油箱隔离阀(5)；S1. Close the canister control valve (4) and the fuel tank isolation valve (5); S2.调节气泵控制阀(3)将气泵(8)接入内部循环；S2. Adjust the air pump control valve (3) to connect the air pump (8) to the internal circulation; S3.打开气泵(8)进行内部循环充气，直到气泵(8)的电流稳定后记录该电流值作为参考稳定电流，完成后关闭气泵(8)；S3. Open the air pump (8) to carry out internal circulation inflation, until the current of the air pump (8) is stabilized, record the current value as a reference stable current, and close the air pump (8) after completion; S4. 打开油箱隔离阀(5)；S4. Open the fuel tank isolation valve (5); S5. 调节气泵控制阀(3)将气泵(8) 接入对耐高压油箱(1)充气状态；S5. Adjust the air pump control valve (3) to connect the air pump (8) to the high pressure resistant fuel tank (1) inflated state; S6. 打开气泵(8)对耐高压油箱(1)进行充气，直到气泵(8)的电流稳定后记录该电流值作为实测稳定电流，完成后关闭气泵(8)；S6. Turn on the air pump (8) to inflate the high-pressure fuel tank (1), until the current of the air pump (8) is stable, record the current value as the measured stable current, and close the air pump (8) after completion; S7. 将参考稳定电流与实测稳定电流进行比较，如参考稳定电流与实测稳定电流之差大于诊断电流阈值，则判断耐高压油箱(1)存在泄漏；S7. Compare the reference stable current with the measured stable current. If the difference between the reference stable current and the measured stable current is greater than the diagnostic current threshold, it is judged that there is leakage in the high-voltage resistant fuel tank (1); 所述封闭诊断方法为，首先设定诊断压力变化阈值，然后使炭罐控制阀(4)和油箱隔离阀(5)保持在关闭状态，通过油箱压力传感器(2)记录油箱压力-时间曲线，当根据油箱压力-时间曲线得到的压力变化超过诊断压力变化阈值时，则判断耐高压油箱(1)存在泄漏。The closed diagnostic method is as follows: firstly, a diagnostic pressure change threshold is set, then the carbon canister control valve (4) and the fuel tank isolation valve (5) are kept in a closed state, and the fuel tank pressure-time curve is recorded by the fuel tank pressure sensor (2), When the pressure change obtained according to the oil tank pressure-time curve exceeds the diagnostic pressure change threshold, it is determined that there is leakage in the high pressure resistant oil tank (1). 2.如权利要求1所述的耐高压油箱泄漏诊断方法，其特征是：所述步骤S3中还包括记录气泵参考电流稳定时间，S6中还包括记录气泵实测电流稳定时间的步骤；设定气泵电流稳定时间系数阈值，当(实测电流稳定时间/参考电流稳定时间)≥气泵电流稳定时间系数阈值时，则判断耐高压油箱存在泄漏。2. The method for diagnosing high-pressure fuel tank leakage as claimed in claim 1, wherein the step S3 also includes recording the reference current stabilization time of the air pump, and in S6, also includes the step of recording the air pump measured current stabilization time; setting the air pump Current stabilization time coefficient threshold, when (measured current stabilization time/reference current stabilization time) ≥ air pump current stabilization time coefficient threshold, it is judged that there is leakage in the high-pressure fuel tank. 3.如权利要求1所述的耐高压油箱泄漏诊断方法，其特征是：所述诊断压力变化阈值为压力下降速率阈值或压力恢复时间阈值，当油箱压力-时间曲线中的压力下降速率超过压力下降速率阈值时或油箱压力下降到环境大气压所用的时间小于压力恢复时间阈值时，则判断耐高压油箱(1)存在泄漏。3. The method for diagnosing leakage of a high-pressure resistant fuel tank according to claim 1, wherein the diagnostic pressure change threshold is a pressure drop rate threshold or a pressure recovery time threshold, and when the pressure drop rate in the fuel tank pressure-time curve exceeds the pressure When the rate of descent is the threshold value or the time taken for the fuel tank pressure to drop to the ambient atmospheric pressure is less than the pressure recovery time threshold value, it is determined that there is a leak in the high pressure resistant fuel tank (1). 4.如权利要求1～3中任意一权利要求所述的耐高压油箱泄漏诊断方法，其特征是：所述压力阈值条件包括压力阈值和基准比较气压，当(压力实测值-基准比较气压)≥压力阈值时，判定压力实测值过高；当(压力实测值-基准比较气压)＜压力阈值时，判定压力实测值正常。4. The method for diagnosing leakage of a high-pressure fuel tank according to any one of claims 1 to 3, wherein the pressure threshold condition includes a pressure threshold and a reference comparative air pressure, when (measured pressure value-reference comparative air pressure) When ≥ the pressure threshold, it is judged that the measured pressure value is too high; when (the measured pressure value - the reference air pressure) < the pressure threshold, it is judged that the measured pressure value is normal. 5.如权利要求4所述的耐高压油箱泄漏诊断方法，其特征是：所述基准比较气压为一个标准大气压或外部环境气压。5 . The method for diagnosing leakage of a high-pressure fuel tank according to claim 4 , wherein the reference comparative air pressure is a standard atmospheric pressure or an external ambient air pressure. 6 . 6.如权利要求1～3中任意一权利要求所述的耐高压油箱泄漏诊断方法，其特征是：所述压力阈值条件包括压力阈值系数和基准比较气压，当(压力实测值/基准比较气压)≥压力阈值系数时，判定压力实测值过高；当(压力实测值/基准比较气压)＜压力阈值系数时，判定压力实测值正常。6. The method for diagnosing leakage of a high-pressure fuel tank according to any one of claims 1 to 3, wherein the pressure threshold condition includes a pressure threshold coefficient and a reference comparative air pressure, when (measured pressure value/reference comparative air pressure) ) ≥ pressure threshold coefficient, it is judged that the measured pressure value is too high; when (measured pressure value/reference comparison air pressure) < pressure threshold coefficient, it is judged that the measured pressure value is normal. 7.如权利要求6所述的耐高压油箱泄漏诊断方法，其特征是：所述基准比较气压为一个标准大气压或外部环境气压。7 . The method for diagnosing leakage of a high-pressure fuel tank according to claim 6 , wherein the reference comparative air pressure is a standard atmospheric pressure or an external ambient air pressure. 8 .
CN201611223301.6A 2016-12-27 2016-12-27 Diagnosis method of high pressure fuel tank leakage Expired - Fee Related CN106500933B (en)

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