CN109281759A - A kind of system and method using pressure sensor diagnosis fuel tank leakage - Google Patents
A kind of system and method using pressure sensor diagnosis fuel tank leakage Download PDFInfo
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- CN109281759A CN109281759A CN201811026654.6A CN201811026654A CN109281759A CN 109281759 A CN109281759 A CN 109281759A CN 201811026654 A CN201811026654 A CN 201811026654A CN 109281759 A CN109281759 A CN 109281759A
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- 239000002828 fuel tank Substances 0.000 title claims abstract description 242
- 238000000034 method Methods 0.000 title claims abstract description 71
- 238000003745 diagnosis Methods 0.000 title claims abstract description 69
- 238000005259 measurement Methods 0.000 claims abstract description 54
- 230000008020 evaporation Effects 0.000 claims description 59
- 238000001704 evaporation Methods 0.000 claims description 59
- 238000003795 desorption Methods 0.000 claims description 48
- 238000009423 ventilation Methods 0.000 claims description 47
- 239000000446 fuel Substances 0.000 claims description 40
- 230000008569 process Effects 0.000 claims description 35
- 238000012937 correction Methods 0.000 claims description 7
- 238000001514 detection method Methods 0.000 abstract description 15
- 230000006870 function Effects 0.000 description 9
- 239000003921 oil Substances 0.000 description 9
- 230000033228 biological regulation Effects 0.000 description 5
- 239000000295 fuel oil Substances 0.000 description 5
- 230000002401 inhibitory effect Effects 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000002405 diagnostic procedure Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 201000010099 disease Diseases 0.000 description 2
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 2
- 230000008450 motivation Effects 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B77/00—Component parts, details or accessories, not otherwise provided for
- F02B77/08—Safety, indicating, or supervising devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
- F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
- F02M25/0809—Judging failure of purge control system
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Supplying Secondary Fuel Or The Like To Fuel, Air Or Fuel-Air Mixtures (AREA)
- Testing Of Engines (AREA)
Abstract
The present invention provides a kind of system and method using pressure sensor diagnosis fuel tank leakage, belong to detection technique field.It solves how to be effectively reduced the method using pressure sensor diagnosis fuel tank leakage the drawbacks of applying on start-stop vehicle.This includes that vacuum degree establishes module, vacuum degree keeps module, waits module, attenuation gradient measurement module and judgment module using the system of pressure sensor diagnosis fuel tank leakage.This method carries out closed-loop control by establishing target vacuum, to fuel tank target vacuum, keeps fuel tank target vacuum；Keep target vacuum that speed is waited to enter start-stop state lower than speed threshold value or engine；Measurement fuel tank vacuum decay gradient simultaneously judges to leak result.This system is split according to the influence degree of tank pressure wave noise during fuel tank leak diagnostics and to the particular requirement of engine operating condition, so that fuel tank leak diagnostics can be carried out in the case where not intervening start-stop function in start-stop function vehicle by realizing.
Description
Technical field
The invention belongs to detection technique fields, are related to a kind of system and side that fuel tank leakage is diagnosed using pressure sensor
Method.
Background technique
A kind of mode of Optimum cost is to use to be mounted on fuel tank or pipe in currently existing vapo(u)rization system leak diagnostics scheme
The diagnostic method of the tank pressure sensing device diagnosis fuel tank leakage of road, the method leaked using pressure sensor diagnosis fuel tank
Assess leakage rate especially by the variation of monitoring tank pressure, can diagnose vapo(u)rization system with the presence or absence of 0.5mm or 0.1mm with
On leakage.As shown in fig. 6, passing through canister between inlet manifold and canister on available engine is desorbed valve piping connection, carbon
Tank and fuel tank piping connection, and tank pressure sensing device is set on fuel tank, connected between canister and air filter by canister ventilation valve pipeline
It connects, valve is desorbed in canister, canister ventilation valve connects engine management system with tank pressure sensing device electric signal, real on existing structure
The pressure signal that diagnostic method depends on pressure sensor to measure, and it is more demanding to the noise level of pressure signal, because
All basic demand vehicles remain static when this diagnosis；In addition, using certain schemes of pressure sensor also to engine
Operating condition requires.Therefore, certain vehicles, such as start-stop vehicle can not be ideally suitable for using the method for pressure sensor,
Mixed motor-car etc., needs to sacrifice some conditions if mandatory use, these conditions, which may be that comparison is difficult in certain vehicles, to be connect
It receives, for example sacrifices to diagnose the start-stop number of start-stop vehicle or force start mixes the engine of motor-car, this will affect
Fuel economy can also reduce experience etc. of driving of terminal user.The existing method using pressure sensor diagnosis fuel tank leakage
Have the function of that disadvantages mentioned above makes in its not applicable start-stop vehicle.
Chinese patent literature discloses a kind of combustion for diagnosing in a motor vehicle application No. is 201610953369.3
The fuel tank leakage device of hopper, fuel tank are connected via ventilation pipe with the gas handling system of internal combustion engine, and internal combustion engine can be by means of increasing
Depressor is pressurized, and fuel tank can be loaded by means of pressure generated in booster with compressed air, in ventilation Guan Zhongbu
It is equipped with valve, fuel tank can be loaded via it with compressed air, and valve can be closed after pressure-loaded, so that ventilation pipe is cut
Only, fuel tank is loaded the leakage that fuel tank is inferred to compressed air and by pressure decline in such a device.Although should
Make cost reduction using the method for positive pressure diagnosis fuel tank leakage and structure is simple, but there is phases in the prior art for this method
Same problem, is not particularly suited for using in start-stop vehicle.
Summary of the invention
The present invention in view of the above-mentioned problems existing in the prior art, proposes a kind of using pressure sensor diagnosis fuel tank leakage
System and method.This method solve how to be effectively reduced playing parking using the method for pressure sensor diagnosis fuel tank leakage
On the drawbacks of application.
The present invention is realized by following technical proposal: a kind of system using pressure sensor diagnosis fuel tank leakage,
It is characterized in that, including
Vacuum degree establishes module, makes tank pressure be restored to atmospheric pressure for closing canister desorption valve, is then shut off carbon
Tank ventilation valve opens canister desorption valve and establishes fuel tank target vacuum using air-distributor vacuum；
Vacuum degree keeps module, for reopening canister desorption valve when fuel tank vacuum degree becomes smaller and is less than setting value,
It is so recycled until then closing canister desorption valve close to target vacuum, for keeping fuel tank target vacuum；
Module is waited, for keeping target vacuum that speed is waited to enter start-stop state lower than speed threshold value or engine；
Attenuation gradient measurement module, current vehicle speed close canister desorption when entering start-stop state lower than threshold value or engine
Valve, tank pressure sensing device measure fuel tank vacuum decay gradient；
Judgment module judges whether fuel tank leaks by fuel tank vacuum decay gradient.
This system includes that vacuum degree establishes module, vacuum degree keeps module, waits module, attenuation gradient measurement module and sentence
Disconnected module establishes module closing canister desorption valve by vacuum degree and tank pressure is made to be restored to atmospheric pressure, it is logical to be then shut off canister
Air-valve opens canister desorption valve and establishes fuel tank target vacuum using air-distributor vacuum, by vacuum after establishing target vacuum
The open state of pressure data and canister desorption valve that degree keeps module to detect using tank pressure sensing device carries out closed-loop control,
Keep fuel tank target vacuum.It keeps waiting module to judge the current vehicle speed of vehicle lower than threshold value during fuel tank target vacuum
Or engine enters start-stop state, persistently waits setting time, within the set time when vehicle current vehicle speed is lower than threshold value or hair
Motivation enters start-stop state, and then attenuation gradient measurement module closes canister desorption valve, and it is true to measure fuel tank by tank pressure sensing device
Empty attenuation gradient.Judgment module according to the fuel tank vacuum decay gradient detected compared with setting gradient value, when fuel tank vacuum declines
Subtract gradient and then judges that fuel tank leaks greater than setting gradient value.Fuel tank vacuum decay gradient is less than or equal to setting gradient value and then judges oil
Case does not leak.This system is by establishing oil using the vacuum of inlet manifold to the regulation that valve is desorbed using canister ventilation valve and canister
Vacuum degree inside case, after entering start-stop state into low speed or engine under continuing for some time holding target vacuum
The fuel tank vacuum decay gradient measured is used to judge the leakage situation of vehicle fuel tank.It establishes and keeps under subnormal ambient in vehicle
Speed enters after start-stop state the measurement for carrying out fuel tank vacuum decay gradient at once, this system lower than setting vehicle speed value or engine
It is carried out according to the influence degree of tank pressure wave noise during fuel tank leak diagnostics and to the particular requirement of engine operating condition
It splits, is divided into two parts and carries out: vacuum establishment stage that is insensitive to pressure noise but having particular requirement to engine operating condition
It is completed in early period, keeps rapidly entering second part under fuel tank target vacuum, second part is quick to pressure noise
Sense but the detection of the vacuum decay gradient to engine operating condition no requirement (NR), to realize can be under inhibiting start-stop operating condition
Fuel tank leak diagnostics are carried out in start-stop function vehicle.
In the above-mentioned system using pressure sensor diagnosis fuel tank leakage, this system further includes evaporation rate measurement mould
Block opens canister ventilation valve after attenuation gradient measurement module carries out fuel tank vacuum decay gradiometry, waits tank pressure extensive
Canister ventilation valve is closed when arriving standard atmospheric pressure again, the data of tank pressure sensing device measurement at this time are fuel evaporation speed.For
Influence of the assessment because of fuel evaporation to leak diagnostics result, evaporation rate measurement module are surveyed with the evaporation rate to fuel oil
Amount, and the detection reduces other factors to vacuum decay gradiometry at the end of the end close to vacuum decay gradiometry
The influence of fuel evaporation speed in the process, make the fuel evaporation speed measured substantially with the measurement process phase of vacuum decay gradient
Together, the reliability of leak diagnostics result is improved.
In the above-mentioned system using pressure sensor diagnosis fuel tank leakage, this system further includes correction module, with true
Empty attenuation gradient subtracts attenuation gradient after fuel evaporation speed is corrected；Judgment module is bigger using attenuation gradient after amendment
Fuel tank leakage is determined when setting gradient value.Vacuum decay gradient, which is corrected, by fuel evaporation speed makes the data of judgement more
Accurately, and the measurement of evaporation rate and the measurement of attenuation gradient are close to can be effectively reduced other factors to fuel evaporation speed
It influences, it is relatively reliable that fuel tank leaks judging result.
In the above-mentioned system using pressure sensor diagnosis fuel tank leakage, this system further includes components diagnosis mould
Block carries out components diagnosis during target vacuum for establishing, and closes in canister desorption valve so that tank pressure is restored to
Judge that canister ventilation valve is normally closed if the tank pressure that tank pressure sensing device measures can not be restored to atmospheric pressure when atmospheric pressure
Failure, when canister ventilation valve closing so that tank pressure slippage is more than that pressure threshold then judges that the normally opened failure of valve is desorbed in canister,
Canister being opened when tank pressure slippage is no more than pressure threshold, valve being desorbed, fuel tank vacuum cannot be established, and judge that canister is desorbed
The normally closed failure of valve, fuel tank vacuum-energy, which is established but cannot reach target vacuum, is then judged as gross leak failure.The diagnosis of components
Process and fuel tank vacuum establishment process are insensitive to pressure noise but have particular requirement to engine operating condition, therefore components
Diagnosis process is placed in the establishment process of fuel tank target vacuum, is not only shortened Diagnostic Time but also be ensure that fuel tank target is true
The foundation of reciprocal of duty cycle will not enter the judgement of last fuel tank attenuation gradient when there is other component failures, exit fuel tank ahead of time
Leak diagnostics.And make component failure diagnosis.
In the above-mentioned system using pressure sensor diagnosis fuel tank leakage, this system further includes exiting diagnostic module,
In target vacuum establishment process, any components diagnose faulty or gross leak and then exit fuel tank leak diagnostics, and
Keep target vacuum that speed is waited to enter start-stop state for time then more than setting time threshold value lower than speed threshold value or engine
Exit fuel tank leak diagnostics.When components diagnosis is out of order or the target vacuum waiting time is too long can to exit in time fuel tank and let out
It fails to pinpoint a disease in diagnosis disconnected, makes fuel tank leak diagnostics while will not influence engine start/stop operating condition in time.
A method of using pressure sensor diagnosis fuel tank leakage, which is characterized in that
It establishes target vacuum: closing canister desorption valve and tank pressure is made to be restored to atmospheric pressure, it is logical to be then shut off canister
Air-valve opens canister desorption valve and establishes fuel tank target vacuum using air-distributor vacuum；
Closed-loop control is carried out to fuel tank target vacuum: then reopening canister less than setting value when fuel tank vacuum degree becomes smaller
Desorption valve is so recycled until then closing canister desorption valve close to target vacuum, keeps fuel tank target vacuum；Keep target
Vacuum degree waits speed to enter start-stop state lower than speed threshold value or engine；
Measurement fuel tank vacuum decay gradient simultaneously judges to leak result: current vehicle speed enters start-stop shape lower than threshold value or engine
Canister being closed when state, valve being desorbed, tank pressure sensing device measures fuel tank vacuum decay gradient, sentenced by fuel tank vacuum decay gradient
Whether oil-break case leaks.
This method makes tank pressure be restored to atmospheric pressure by closing canister desorption valve, is then shut off canister ventilation valve and beats
It opens canister desorption valve and establishes fuel tank target vacuum using air-distributor vacuum, tank pressure is utilized after establishing target vacuum
The pressure data of sensor detection and the open state of canister desorption valve carry out closed-loop control, keep fuel tank target vacuum.It protects
Holding fuel tank target vacuum in the process ought judge that the current vehicle speed of vehicle enters start-stop state lower than threshold value or engine, then closes
Valve is desorbed in canister, measures fuel tank vacuum decay gradient by tank pressure sensing device.According to the fuel tank vacuum decay ladder detected
Degree then judges that fuel tank leaks compared with setting gradient value, when fuel tank vacuum decay gradient is greater than setting gradient value.Fuel tank vacuum declines
Subtract gradient and then judges that fuel tank does not leak less than or equal to setting gradient value.The present invention to using canister ventilation valve and canister by being desorbed
The vacuum degree of fuel tank internal is established in the regulation of valve using the vacuum of inlet manifold, in the case where continuing for some time holding target vacuum
Enter the fuel tank vacuum decay gradient measured after start-stop state into low speed or engine for judging letting out for vehicle fuel tank
Leak situation.It establishes and keeps entering after start-stop state at once in vehicle speed lower than setting vehicle speed value or engine under subnormal ambient
The measurement of fuel tank vacuum decay gradient is carried out, this method is according to the influence of tank pressure wave noise during fuel tank leak diagnostics
Degree and the particular requirement of engine operating condition is split, be divided into two parts and carry out: is insensitive to pressure noise but to hair
Motivation operating condition has the vacuum establishment stage of particular requirement to complete in early period, keeps rapidly entering under fuel tank target vacuum
Second part, second part are the detections of vacuum decay gradient sensitive to pressure noise but to engine operating condition no requirement (NR), from
And fuel tank leak diagnostics can carried out under inhibiting start-stop operating condition in start-stop function vehicle by realizing.
In the above-mentioned method using pressure sensor diagnosis fuel tank leakage, vaccum fuel tank vacuum decay gradient is measured
Afterwards, canister ventilation valve is opened, tank pressure is waited to close canister ventilation valve, measurement fuel evaporation speed when being restored to standard atmospheric pressure
Degree, vacuum decay gradient subtract attenuation gradient after fuel evaporation speed is corrected, and attenuation gradient is greater than setting gradient after amendment
Fuel tank leakage is determined when value.In order to assess the influence because of fuel evaporation to leak diagnostics result, evaporation rate measurement module use pair
The evaporation rate of fuel oil measures, and the detection is at the end of the end close to vacuum decay gradiometry, reduce other because
Influence of the element to fuel evaporation speed during vacuum decay gradiometry, makes the fuel evaporation speed measured decline substantially with vacuum
The measurement process for subtracting gradient is identical, improves the reliability of leak diagnostics result.Vacuum decay ladder is corrected by fuel evaporation speed
Degree is so that the data of judgement are more accurate, and the measurement of evaporation rate and the measurement of attenuation gradient are close to can be effectively reduced it
He influences fuel evaporation speed factor, and it is relatively reliable that fuel tank leaks judging result.
In the above-mentioned method using pressure sensor diagnosis fuel tank leakage, progress zero during target vacuum is established
Ponent design, if closing the fuel tank that tank pressure sensing device measures when canister desorption valve makes tank pressure be restored to atmospheric pressure
Pressure can not be restored to atmospheric pressure and then judge the normally closed failure of canister ventilation valve.The diagnosis process and fuel tank vacuum of components were established
Journey is insensitive to pressure noise but has particular requirement to engine operating condition, therefore the diagnosis process of components is placed on fuel tank target
It in the establishment process of vacuum degree, not only shortens Diagnostic Time but also ensure that the foundation of fuel tank target vacuum, when there is other
The judgement that last fuel tank attenuation gradient will not be entered when component failure, exits fuel tank leak diagnostics ahead of time.And make zero
Part fault diagnosis.
In the above-mentioned method using pressure sensor diagnosis fuel tank leakage, closes canister ventilation valve and make tank pressure
Slippage is more than that pressure threshold then judges that the normally opened failure of valve is desorbed in canister, is beaten when tank pressure slippage is no more than pressure threshold
Canister desorption valve is opened, fuel tank vacuum cannot be established, and judge that the normally closed failure of valve is desorbed in canister, fuel tank vacuum-energy is established but cannot be arrived
Then it is judged as gross leak failure up to target vacuum.The diagnosis process and fuel tank vacuum establishment process of components to pressure noise not
It is sensitive but have particular requirement to engine operating condition, therefore the diagnosis process of components is placed on the foundation of fuel tank target vacuum
Cheng Zhong not only shortens the time of diagnosis but also ensure that the foundation of fuel tank target vacuum, when there is other component failures
The judgement of last fuel tank attenuation gradient will not be entered.Last fuel tank decaying ladder will not be entered when there are other component failures
The judgement of degree.Fuel tank leak diagnostics are exited ahead of time.And make component failure diagnosis.
In the above-mentioned method using pressure sensor diagnosis fuel tank leakage, in target vacuum establishment process, appoint
Components of anticipating diagnose faulty or gross leak and then exit fuel tank leak diagnostics.When components diagnosis is out of order and can be moved back in time
Fuel tank leak diagnostics out make fuel tank leak diagnostics in time.
In the above-mentioned method using pressure sensor diagnosis fuel tank leakage, keep target vacuum that speed is waited to be lower than
Speed threshold value or engine enter start-stop state for time and then exit fuel tank leak diagnostics more than setting time threshold value.Work as target vacuum
Waiting time is too long can to exit fuel tank leak diagnostics in time, avoid impacting other function.
Compared with prior art, this is diagnosed using pressure sensor in the system and method for fuel tank leakage.With following excellent
Point:
1, the present invention is in components tank pressure sensing device, the canister ventilation valve, canister for not changing original start-stop vehicle
It is desorbed on the basis of valve, is realized by improving control strategy using fuel tank of the tank pressure sensing device on start-stop utility vehicles
Leak diagnostics application.
2, the present invention is by the influence degree of tank pressure wave noise during fuel tank leak diagnostics and to engine work
The particular requirement of condition is split, and is divided into two parts and is carried out: is insensitive to pressure noise but have specific want to engine operating condition
The vacuum establishment stage asked is completed in early period, keeps rapidly entering second part under fuel tank target vacuum, second
Point it is the detection of vacuum decay gradient sensitive to pressure noise but to engine operating condition no requirement (NR), is not inhibiting to realize
Fuel tank leak diagnostics can be carried out under start-stop operating condition in start-stop function vehicle.
3, the present invention makes the data of judgement more accurate by fuel evaporation speed amendment vacuum decay gradient, and evaporates
The measurement of speed and the measurement of attenuation gradient are close to other factors, which can be effectively reduced, influences fuel evaporation speed, and fuel tank is let out
It is relatively reliable to leak judging result.
Detailed description of the invention
Fig. 1 is system block diagram of the invention.
Fig. 2 is overall flow figure of the invention.
Fig. 3 is the diagnosis of first stage components and vacuum degree Establishing process figure.
Fig. 4 is that second stage keeps target vacuum, waits stationary vehicle flow chart.
Fig. 5 is phase III leakage outcome measurement decision flow chart.
Fig. 6 is vapo(u)rization system pipeline schematic diagram on start-stop utility vehicles.
In figure, 1, vacuum degree establish module；2, vacuum degree keeps module；3, module is waited；4, attenuation gradient measurement module；
5, judgment module；6, evaporation rate measurement module；7, correction module；8, components diagnostic module；9, diagnostic module is exited.
Specific embodiment
The following is specific embodiments of the present invention, and technical scheme of the present invention will be further described in conjunction with attached drawing,
However, the present invention is not limited to these examples.
As shown in figures 1 to 6, it is set in engine management system, is wrapped using the system of pressure sensor diagnosis fuel tank leakage
It includes vacuum degree and establishes module 1, make tank pressure be restored to atmospheric pressure for closing canister desorption valve, be then shut off canister ventilation
Valve opens canister desorption valve and establishes fuel tank target vacuum using air-distributor vacuum；Vacuum degree keeps module 2, for working as fuel tank
Vacuum degree becomes smaller and reopens canister desorption valve when being less than setting value, until then closing canister desorption valve close to target vacuum
So circulation, for keeping fuel tank target vacuum；Module 3 is waited, for keeping target vacuum to wait speed lower than speed
Threshold value or engine enter start-stop state；Attenuation gradient measurement module 4, current vehicle speed enter start-stop shape lower than threshold value or engine
Canister being closed when state, valve being desorbed, tank pressure sensing device measures fuel tank vacuum decay gradient；Judgment module 5 passes through fuel tank vacuum
Attenuation gradient judges whether fuel tank leaks.
This system further includes evaporation rate measurement module 6 and correction module 7, and evaporation rate measurement module 6 is in attenuation gradient
After measurement module 4 carries out fuel tank vacuum decay gradiometry, canister ventilation valve is opened, tank pressure is waited to be restored to normal atmosphere
Canister ventilation valve is closed when pressure, the data of tank pressure sensing device measurement at this time are fuel evaporation speed.And for a period of time later
The data of interior tank pressure sensing device measurement are fuel evaporation speed.Correction module 7 subtracts fuel evaporation with vacuum decay gradient
Attenuation gradient after speed is corrected；Judgment module 5 is compared using attenuation gradient after amendment determines oil when being greater than setting gradient value
Case leakage.In order to assess the influence because of fuel evaporation to leak diagnostics result, evaporation of the evaporation rate measurement module 6 to fuel oil
Speed measures, and the detection reduces other factors and decline to vacuum at the end of the end close to vacuum decay gradiometry
The influence for subtracting fuel evaporation speed during gradiometry, makes survey of the fuel evaporation speed measured substantially with vacuum decay gradient
Amount process is identical, improves the reliability of leak diagnostics result.Vacuum decay gradient is corrected by fuel evaporation speed simultaneously to make
The data of judgement are more accurate, and the measurement of evaporation rate and the measurement of attenuation gradient are close to can be effectively reduced other factors
Fuel evaporation speed is influenced, it is relatively reliable that fuel tank leaks judging result.Condition is enabled during leak diagnostics to be unsatisfactory for
Shi Ze exits fuel tank leak diagnostics.
This system further includes components diagnostic module 8 and exits diagnostic module 9, and components diagnostic module 8 is for establishing mesh
It marks vacuum degree and carries out components diagnosis in the process, if closed in canister desorption valve so that oily when tank pressure is restored to atmospheric pressure
The tank pressure that case pressure sensor measures can not be restored to atmospheric pressure and then judge the normally closed failure of canister ventilation valve, when canister is divulged information
Valve is closed so that tank pressure slippage is more than that pressure threshold then judges that the normally opened failure of valve is desorbed in canister, in tank pressure slippage
Canister being opened when no more than pressure threshold, valve being desorbed, fuel tank vacuum cannot be established, and judge that the normally closed failure of valve, fuel tank is desorbed in canister
Vacuum-energy, which is established but cannot reach target vacuum, is then judged as gross leak failure.In target vacuum establishment process, arbitrarily
Components diagnose faulty or gross leak and then exit fuel tank leak diagnostics, and keep target vacuum that speed is waited to be lower than vehicle
Fast threshold value or engine enter start-stop state for time and then exit fuel tank leak diagnostics more than setting time threshold value.The diagnosis of components
Process and fuel tank vacuum establishment process are insensitive to pressure noise but have particular requirement to engine operating condition, therefore components
Diagnosis process is placed in the establishment process of fuel tank target vacuum, is not only shortened the time of diagnosis but also be ensure that fuel tank target
The foundation of vacuum degree will not enter the judgement of last fuel tank attenuation gradient when there is other component failures.Oil is exited ahead of time
Case leak diagnostics.And make component failure diagnosis.Components diagnosis be out of order or the target vacuum waiting time it is too long can
Fuel tank leak diagnostics are exited in time, make fuel tank leak diagnostics while will not influence engine start/stop operating condition in time.
Valve piping connection, carbon are desorbed by canister between inlet manifold and canister on existing start-stop function vehicle motor
Tank and fuel tank piping connection, and tank pressure sensing device is set on fuel tank or pipeline, pass through canister between canister and inlet manifold
Ventilation valve piping connection, canister desorption valve, canister ventilation valve connect engine management system with tank pressure sensing device electric signal.
This is set to engine management system using the system of pressure sensor diagnosis fuel tank leakage, is answering in engine management system
Use programming system.This system includes that vacuum degree establishes module 1, vacuum degree keeps module 2, waits module 3, attenuation gradient measurement mould
Block 4, judgment module 5, evaporation rate measurement module 6, correction module 7, components diagnostic module 8 and exit diagnostic module 9.Vacuum
Degree establishes the closing canister desorption valve of module 1 and tank pressure is made to be restored to atmospheric pressure, is then shut off canister ventilation valve and opens canister
Valve is desorbed and establishes fuel tank target vacuum using air-distributor vacuum, establishes components in 1 course of work of module in vacuum degree and examines
Disconnected module 8 also works, and the opening and closing of valve are desorbed by canister ventilation valve in fuel tank vacuum degree establishment process and canister
It controls the tank pressure situation analysis reached and judges whether canister ventilation valve and canister desorption valve and fuel tank the feelings such as gross leak occur
Condition.Keep module 2 using the pressure data and canister of the detection of tank pressure sensing device by vacuum degree after establishing target vacuum
The open state that valve is desorbed carries out closed-loop control, keeps fuel tank target vacuum.It keeps waiting during fuel tank target vacuum
Module 3 judges that the current vehicle speed of vehicle enters start-stop state lower than threshold value or engine, setting time is persistently waited, in setting
In when vehicle current vehicle speed lower than threshold value or engine enters start-stop state, then attenuation gradient measurement module 4 closes canister desorption
Valve measures fuel tank vacuum decay gradient by tank pressure sensing device.Fuel tank vacuum decay is carried out in attenuation gradient measurement module 4
After gradiometry, canister ventilation valve is opened in the control of evaporation rate measurement module 6, when tank pressure being waited to be restored to standard atmospheric pressure
Canister ventilation valve is closed, the data of tank pressure sensing device measurement at this time are fuel evaporation speed.And it is oily in a period of time later
The data of case pressure sensor measurement are fuel evaporation speed.Then vacuum decay gradient is subtracted fuel evaporation by correction module 7
Attenuation gradient after speed is corrected, judgment module 5 is compared using attenuation gradient after amendment determines oil when being greater than setting gradient value
Case leakage.Attenuation gradient then judges that fuel tank does not leak less than or equal to setting gradient value after amendment.This system by utilize canister
The vacuum degree of fuel tank internal is established in the regulation of ventilation valve and canister desorption valve using the vacuum of inlet manifold, is being continued for some time
It keeps entering low speed under target vacuum or engine enters the fuel tank vacuum decay gradient measured after start-stop state and uses
In the leakage situation for judging vehicle fuel tank.Establish and keep under subnormal ambient vehicle speed lower than setting vehicle speed value or engine into
Enter to carry out after start-stop state the measurement of fuel tank vacuum decay gradient at once, this system is according to fuel tank pressure during fuel tank leak diagnostics
The influence degree of Reeb moving noise and the particular requirement of engine operating condition is split, is divided into two parts and carries out: to pressure
Insensitive for noise but to engine operating condition have the vacuum establishment stage of particular requirement early period complete, keep fuel tank target vacuum
Under can rapidly enter second part, second part is sensitive to pressure noise but declines to the vacuum of engine operating condition no requirement (NR)
Subtract the detection of gradient, thus realize can be carried out in start-stop function vehicle under inhibiting start-stop operating condition fuel tank leakage examine
It is disconnected.
This establishes target vacuum using the method for pressure sensor diagnosis fuel tank leakage: closing canister desorption valve and makes
Tank pressure is restored to atmospheric pressure, is then shut off canister ventilation valve opening canister desorption valve using air-distributor vacuum and establishes fuel tank
Target vacuum；Closed-loop control is carried out to fuel tank target vacuum: then being reopened when fuel tank vacuum degree becomes smaller less than setting value
Canister is desorbed valve and so recycles until then closing canister desorption valve close to target vacuum, keeps fuel tank target vacuum；It keeps
Target vacuum waits speed to enter start-stop state lower than speed threshold value or engine；Measurement fuel tank vacuum decay gradient simultaneously judges
Leakage result: current vehicle speed closes canister desorption valve, tank pressure sensing device when entering start-stop state lower than threshold value or engine
Fuel tank vacuum decay gradient is measured, judges whether fuel tank leaks by fuel tank vacuum decay gradient.Measurement vaccum fuel tank vacuum declines
After subtracting gradient, canister ventilation valve is opened, tank pressure is waited to close canister ventilation valve when being restored to standard atmospheric pressure, measures fuel oil
Evaporation rate, vacuum decay gradient subtract attenuation gradient after fuel evaporation speed is corrected, and attenuation gradient is greater than and sets after amendment
Determine to determine fuel tank leakage when gradient value.In order to assess the influence because of fuel evaporation to leak diagnostics result, evaporation rate measures mould
Block 6 is measured with the evaporation rate to fuel oil, and the detection reduces at the end of the end close to vacuum decay gradiometry
Influence of the other factors to fuel evaporation speed during vacuum decay gradiometry, make the fuel evaporation speed measured substantially with
The measurement process of vacuum decay gradient is identical, improves the reliability of leak diagnostics result.Vacuum is corrected by fuel evaporation speed
Attenuation gradient makes the data of judgement more accurate, and the measurement of evaporation rate and the measurement of attenuation gradient are close to can be effective
Reducing other factors influences fuel evaporation speed, and it is relatively reliable that fuel tank leaks judging result.
It establishes target vacuum and carries out components diagnosis in the process, close canister desorption valve and tank pressure is restored to greatly
Canister ventilation valve normally closed event is judged when air pressure if the tank pressure that tank pressure sensing device measures can not be restored to atmospheric pressure
Barrier.Closing canister ventilation valve makes tank pressure slippage be more than that pressure threshold then judges that the normally opened failure of valve is desorbed in canister, in oil
Case pressure slippage opens canister when being no more than pressure threshold and valve is desorbed, and fuel tank vacuum cannot be established, and judges that canister desorption valve is normal
Failure is closed, fuel tank vacuum-energy, which is established but cannot reach target vacuum, is then judged as gross leak failure.The diagnosis process of components
It is insensitive to pressure noise with fuel tank vacuum establishment process but have particular requirement to engine operating condition, therefore the diagnosis of components
Process is placed in the establishment process of fuel tank target vacuum, is not only shortened the time of diagnosis but also be ensure that fuel tank target vacuum
The foundation of degree will not enter the judgement of last fuel tank attenuation gradient when there is other component failures.It is proposed that fuel tank is let out ahead of time
It fails to pinpoint a disease in diagnosis disconnected.And make component failure diagnosis.It can preferably realize fuel tank leak detection.
In target vacuum establishment process, any components diagnose faulty or gross leak and then exit fuel tank leakage
Diagnosis.Fuel tank leak diagnostics can be exited in time by being out of order when components diagnosis, make fuel tank leak diagnostics in time.Keep target
Vacuum degree waits speed to enter start-stop state for time lower than speed threshold value or engine and then exits fuel tank more than setting time threshold value
Leak diagnostics.Fuel tank leak diagnostics can be exited in time when the target vacuum waiting time is too long, will not inhibit engine start/stop work
Condition, makes that it is suitable in start-stop function vehicle.
This method makes tank pressure be restored to atmospheric pressure by closing canister desorption valve, is then shut off canister ventilation valve and beats
It opens canister desorption valve and establishes fuel tank target vacuum using air-distributor vacuum, tank pressure is utilized after establishing target vacuum
The pressure data of sensor detection and the open state of canister desorption valve carry out closed-loop control, keep fuel tank target vacuum.It protects
Holding fuel tank target vacuum in the process ought judge that the current vehicle speed of vehicle enters start-stop state lower than threshold value or engine, then closes
Valve is desorbed in canister, measures fuel tank vacuum decay gradient by tank pressure sensing device.According to the fuel tank vacuum decay ladder detected
Degree then judges that fuel tank leaks compared with setting gradient value, when fuel tank vacuum decay gradient is greater than setting gradient value.Fuel tank vacuum declines
Subtract gradient and then judges that fuel tank does not leak less than or equal to setting gradient value.The present invention to using canister ventilation valve and canister by being desorbed
The vacuum degree of fuel tank internal is established in the regulation of valve using the vacuum of inlet manifold, in the case where continuing for some time holding target vacuum
Enter the fuel tank vacuum decay gradient measured after start-stop state into low speed or engine for judging letting out for vehicle fuel tank
Leak situation.Normal atmosphere pressure is established after measuring fuel tank vacuum decay gradient and carries out the measurement of oil tank fuel evaporation rate, oil
Case vacuum decay gradient subtracts attenuation gradient after fuel evaporation speed is corrected.Pass through attenuation gradient after amendment and setting gradient
Value, which is compared, judges fuel tank leakage situation, is determined as that fuel tank leaks when attenuation gradient is greater than setting gradient value after amendment, when
Attenuation gradient is less than or equal to be determined as that fuel tank does not leak when setting gradient value after amendment.
It establishes and keeps entering horse after start-stop state lower than setting vehicle speed value or engine in vehicle speed under subnormal ambient
The upper measurement for carrying out fuel tank vacuum decay gradient, this method is according to the shadow of tank pressure wave noise during fuel tank leak diagnostics
It rings and degree and the particular requirement of engine operating condition is split, be divided into two parts and carry out: is insensitive to pressure noise but right
Engine operating condition have the vacuum establishment stage of particular requirement early period complete, keep fuel tank target vacuum under can rapidly into
Entering second part, second part is the detection of vacuum decay gradient sensitive to pressure noise but to engine operating condition no requirement (NR),
Fuel tank leak diagnostics can be being carried out in start-stop function vehicle under inhibiting start-stop operating condition to realize.
The present invention solves the method using pressure sensor diagnosis fuel tank leakage the drawbacks of applying on start-stop vehicle, makes oil
The method of case pressure sensor can sacrifice less, acceptable terms and be just able to satisfy regulation when applying on start-stop vehicle to be wanted
It asks, reduces vehicle cost.System and method can equally be well applied on other conventional non-start-stop vehicles, but on start-stop vehicle more
Its advantage can be embodied.
Specific embodiment described herein is only an example for the spirit of the invention.The neck of technology belonging to the present invention
The technical staff in domain can make various modifications or additions to the described embodiments or replace by a similar method
In generation, however, it does not deviate from the spirit of the invention or beyond the scope of the appended claims.
Claims (10)
1. a kind of system using pressure sensor diagnosis fuel tank leakage, which is characterized in that including
Vacuum degree establishes module (1), makes tank pressure be restored to atmospheric pressure for closing canister desorption valve, is then shut off canister
Ventilation valve opens canister desorption valve and establishes fuel tank target vacuum using air-distributor vacuum；
Vacuum degree keeps module (2), for reopening canister desorption valve when fuel tank vacuum degree becomes smaller and is less than setting value, directly
It is so recycled to canister desorption valve is then closed close to target vacuum, for keeping fuel tank target vacuum；
It waits module (3), for keeping target vacuum that speed is waited to enter start-stop state lower than speed threshold value or engine；
Attenuation gradient measurement module (4), current vehicle speed close canister desorption valve when entering start-stop state lower than threshold value or engine,
Tank pressure sensing device measures fuel tank vacuum decay gradient；
Judgment module (5) judges whether fuel tank leaks by fuel tank vacuum decay gradient.
2. the system according to claim 1 using pressure sensor diagnosis fuel tank leakage, which is characterized in that this system is also
Including evaporation rate measurement module (6), after attenuation gradient measurement module (4) carry out fuel tank vacuum decay gradiometry, open
Canister ventilation valve waits tank pressure to close canister ventilation valve when being restored to standard atmospheric pressure, and tank pressure sensing device is surveyed at this time
The data of amount are fuel evaporation speed.
3. the system according to claim 2 using pressure sensor diagnosis fuel tank leakage, which is characterized in that this system is also
Including correction module (7), attenuation gradient after fuel evaporation speed is corrected is subtracted with vacuum decay gradient；Judgment module (5)
Compared using attenuation gradient after amendment and determines that fuel tank leaks when being greater than setting gradient value.
4. the system according to claim 1 or 2 or 3 using pressure sensor diagnosis fuel tank leakage, which is characterized in that this
System further includes components diagnostic module (8), carries out components diagnosis during target vacuum for establishing, is desorbed in canister
If valve is closed so that the tank pressure that tank pressure sensing device measures when tank pressure is restored to atmospheric pressure can not be restored to greatly
Air pressure then judges the normally closed failure of canister ventilation valve, when canister ventilation valve close so that tank pressure slippage be more than pressure threshold then
Judge that the normally opened failure of valve is desorbed in canister, canister is opened when tank pressure slippage is no more than pressure threshold, valve is desorbed, fuel tank is true
Sky cannot be established, and judge that the normally closed failure of valve is desorbed in canister, fuel tank vacuum-energy, which is established but cannot reach target vacuum, to be then judged as
Gross leak failure.
5. the system according to claim 4 using pressure sensor diagnosis fuel tank leakage, which is characterized in that this system is also
Including exiting diagnostic module (9), in target vacuum establishment process, any components diagnose faulty or gross leak then
Fuel tank leak diagnostics are exited, and keep target vacuum that speed is waited to enter start-stop state for time lower than speed threshold value or engine
Fuel tank leak diagnostics are then exited more than setting time threshold value.
6. a kind of method using pressure sensor diagnosis fuel tank leakage, which is characterized in that
It establishes target vacuum: closing canister desorption valve and tank pressure is made to be restored to atmospheric pressure, be then shut off canister ventilation valve
It opens canister desorption valve and establishes fuel tank target vacuum using air-distributor vacuum；
Closed-loop control is carried out to fuel tank target vacuum: then reopening canister desorption less than setting value when fuel tank vacuum degree becomes smaller
Valve is so recycled until then closing canister desorption valve close to target vacuum, keeps fuel tank target vacuum；Keep target vacuum
Degree waits speed to enter start-stop state lower than speed threshold value or engine；
Measurement fuel tank vacuum decay gradient simultaneously judges to leak result: when current vehicle speed enters start-stop state lower than threshold value or engine
It closes canister and valve is desorbed, tank pressure sensing device measures fuel tank vacuum decay gradient, judges oil by fuel tank vacuum decay gradient
Whether case leaks.
7. the method according to claim 6 using pressure sensor diagnosis fuel tank leakage, which is characterized in that measurement vacuum
After fuel tank vacuum decay gradient, canister ventilation valve is opened, canister ventilation is closed when tank pressure being waited to be restored to standard atmospheric pressure
Valve, measures fuel evaporation speed, and vacuum decay gradient subtracts attenuation gradient after fuel evaporation speed is corrected, decays after amendment
Fuel tank leakage is determined when gradient is greater than the set value.
8. the method according to claim 6 or 7 using pressure sensor diagnosis fuel tank leakage, which is characterized in that establish
Components diagnosis is carried out during target vacuum, if closing oil when canister desorption valve makes tank pressure be restored to atmospheric pressure
The tank pressure that case pressure sensor measures can not be restored to atmospheric pressure and then judge the normally closed failure of canister ventilation valve.
9. the method according to claim 8 using pressure sensor diagnosis fuel tank leakage, which is characterized in that close canister
Ventilation valve makes tank pressure slippage be more than that pressure threshold then judges that the normally opened failure of valve is desorbed in canister, in tank pressure slippage
Canister being opened when no more than pressure threshold, valve being desorbed, fuel tank vacuum cannot be established, and judge that the normally closed failure of valve, fuel tank is desorbed in canister
Vacuum-energy, which is established but cannot reach target vacuum, is then judged as gross leak failure.
10. the method according to claim 9 using pressure sensor diagnosis fuel tank leakage, which is characterized in that in target
In vacuum degree establishment process, any components diagnose faulty or gross leak and then exit fuel tank leak diagnostics；Keep target
Vacuum degree waits speed to enter start-stop state for time lower than speed threshold value or engine and then exits fuel tank more than setting time threshold value
Leak diagnostics.
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| CN112031946A (en) * | 2020-09-08 | 2020-12-04 | 广州汽车集团股份有限公司 | Fault diagnosis method for fuel evaporation system |
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