CN106500933B - High pressure resistant fuel tank leakage diagnosing method - Google Patents
High pressure resistant fuel tank leakage diagnosing method Download PDFInfo
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- 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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- 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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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
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. a kind of high pressure resistant fuel tank leakage diagnosing method, which is built-in with tank pressure sensing device (2), special
Sign is to set pressure threshold condition, determined with pressure measured value of the pressure threshold condition to tank pressure sensing device (2),
When excessively high with pressure threshold condition criterion pressure measured value, using closing diagnostic mode；When with pressure threshold condition criterion pressure
When power 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 (4) and fuel tank isolation valve (5) are closed；
S2. air pump control valve (3) are adjusted, air pump (8) is accessed into internal circulation；
S3. air pump (8) are opened and carry out internal circulation inflatable, record the current value as ginseng after the electric current of air pump (8) is stablized
Stabling current is examined, closes air pump (8) after the completion；
S4. fuel tank isolation valve (5) are opened；
S5. air pump control valve (3) are adjusted to access air pump (8) to high pressure resistant fuel tank (1) inflated condition；
S6. air pump (8) are opened to be inflated high pressure resistant fuel tank (1), record the electric current after the electric current of air pump (8) is stablized
Value closes air pump (8) after the completion as actual measurement stabling current；
S7. it will be compared with reference to stabling current with actual measurement stabling current, such as difference with reference to stabling current and actual measurement stabling current
Greater than diagnosis current threshold, then judge that high pressure resistant fuel tank (1) has leakage；
The closing diagnostic method is that setting first diagnoses pressure change threshold value, is then isolated canister vent valve (4) and fuel tank
Valve (5) is kept in off position, tank pressure-time graph is recorded by tank pressure sensing device (2), when according to fuel tank pressure
When the pressure change that force-time curve obtains is more than diagnosis pressure change threshold value, then judge that high pressure resistant fuel tank (1) has leakage.
2. high pressure resistant fuel tank leakage diagnosing method as described in claim 1, it is characterized in that: further including record in the step S3
Air pump reference current is stablized the time, further includes the steps that recording air pump measured current stablizes the time in S6；It is steady to set air pump electric current
It fixes time coefficient threshold, when (measured current stablize the time/reference current stablize the time) >=air pump electric current stablizes time coefficient threshold
When value, then judge that high pressure resistant fuel tank has leakage.
3. high pressure resistant fuel tank leakage diagnosing method as described in claim 1, it is characterized in that: the diagnosis pressure change threshold value is
Pressure drop rate threshold value or buildup time threshold value, when the pressure drop rate in tank pressure-time graph is more than pressure
When power fall off rate threshold value or when tank pressure drops to the time used in ambient atmosphere pressure less than buildup time threshold value, then
Judge that high pressure resistant fuel tank (1) has leakage.
4. the high pressure resistant fuel tank leakage diagnosing method as described in claim any one in claims 1 to 3, it is characterized in that: institute
Stating pressure threshold condition includes that pressure threshold and benchmark compare air pressure, when (pressure measured value-benchmark compares air pressure) >=pressure threshold
When value, determine that pressure measured value is excessively high；When (pressure measured value-benchmark compares air pressure) < pressure threshold, pressure actual measurement is determined
Value is normal.
5. high pressure resistant fuel tank leakage diagnosing method as claimed in claim 4, it is characterized in that: it is one that the benchmark, which compares air pressure,
Standard atmospheric pressure or external ambient air pressure.
6. the high pressure resistant fuel tank leakage diagnosing method as described in claim any one in claims 1 to 3, it is characterized in that: institute
Stating pressure threshold condition includes that pressure threshold coefficient and benchmark compare air pressure, when (pressure measured value/benchmark compares air pressure) >=pressure
When force threshold coefficient, determine that pressure measured value is excessively high；When (pressure measured value/benchmark compares air pressure) < pressure threshold coefficient,
Determine that pressure measured value is normal.
7. high pressure resistant fuel tank leakage diagnosing method as claimed in claim 6, it is characterized in that: it is one that the benchmark, which compares air pressure,
Standard atmospheric pressure or external ambient air pressure.
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| 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 |
| CN115898714A (en) * | 2022-11-25 | 2023-04-04 | 长城汽车股份有限公司 | Decompression valve control method and system, vehicle and medium |
| CN116026532A (en) * | 2023-03-27 | 2023-04-28 | 苏州恩都法汽车系统股份有限公司 | Sectional type leakage diagnosis system, sectional type leakage diagnosis method and vehicle |
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