CN110031160A - Fuel evaporation leak detection system and method - Google Patents
Fuel evaporation leak detection system and method Download PDFInfo
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- CN110031160A CN110031160A CN201910444941.7A CN201910444941A CN110031160A CN 110031160 A CN110031160 A CN 110031160A CN 201910444941 A CN201910444941 A CN 201910444941A CN 110031160 A CN110031160 A CN 110031160A
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- Prior art keywords
- control unit
- electronic control
- air pump
- pressure
- value
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Classifications
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B51/00—Testing machines, pumps, or pumping installations
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
Abstract
It includes: electronic control unit, air pump, fuel tank, canister, Valve EGR and pressure sensor that the present invention, which discloses a kind of fuel evaporation leak detection system and method, the system,；Electronic control unit closes Valve EGR when detecting that engine is in idling mode, it obtains the current pressure values of pressure sensor acquisition and is compared it with preset calibrations value, reliability detection and the acquisition system pressure when testing result meets preset condition are carried out to air pump if being less than, when system pressure is less than preset reference pressure, determine that there are fuel evaporation leakages.The present invention does not need to vacuumize fuel passage, reduce leak detection difficulty, simultaneously because whether first close Valve EGR detection solenoid valve faulty, if fault-free carries out fault detection to air pump again, then the system pressure for passing through acquisition again in air pump fault-free judges whether there is fuel evaporation leakage, so as to realize the accurate positionin to trouble unit, the accuracy of leak detection is also improved.
Description
Technical field
The present invention relates to automobile technical field more particularly to a kind of fuel evaporation leak detection system and methods.
Background technique
In the whole part of automobile, fuel system is a very important component part.Due to the vapour in fuel tank
Oil have volatile characteristic, be normally filled with gasoline vapor in fuel tank at normal temperature, in order to control the air pressure in fuel tank,
Gasoline vapor is evaporate into atmosphere when gasoline vapor being introduced into engine combustion and reducing oiling to the greatest extent, generallys use vehicle-mounted add
Oily device for recovering oil and gas (Onboard Refueling Vapor Recovery, ORVR), i.e., between the engine and the fuel tank
Canister is set, is provided with active carbon in canister, the active carbon can absorbing gasoline steam, fuel tank and canister are in communicating shape
State, gasoline vapor can enter canister by pipeline, and canister is also communicated with the atmosphere with blow vent.
In view of the above situation, six onboard diagnostic system of state (On-Board Diagnostics, OBD) regulation is to vehicle exhaust
Emission limit has made more harsh definition.Simultaneously fuel pipe is also made more to be distinctly claimed: to the fuel evaporation in automobile
Leakage is monitored, and fuel-steam is avoided to be leaked in atmosphere.
At present there are two types of fuel evaporation leak detection schemes, one is the vacuum degree decaying using EVAP Evaporative System to sentence
For disconnected system out with the presence or absence of leakage, another kind is to judge whether system deposits using the pressure rise curve of EVAP Evaporative System
It is revealing.The defect of the first scheme is to need to vacuumize fuel passage, higher for detection environmental requirement, second of side
The defect of case is not accounting for other influence factors in addition to pressure, and the accuracy of testing result is not relatively high.
Above content is only used to facilitate the understanding of the technical scheme, and is not represented and is recognized that above content is existing skill
Art.
Summary of the invention
The main purpose of the present invention is to provide a kind of fuel evaporation leak detection system and methods, it is intended to solve existing
Technology high to detection environmental requirement, accuracy deficiency technical problem in detection fuel evaporation leakage process.
To achieve the above object, the present invention provides a kind of fuel evaporation leak detection system, the system comprises: electronics
Control unit, air pump, fuel tank, canister, Valve EGR and pressure sensor；
Wherein, the canister respectively with the fuel tank, the air pump and the Valve EGR piping connection, the pressure
Force snesor is set between air inlet pipeline and the Valve EGR, the electronic control unit respectively with the canister electromagnetism
Valve, the pressure sensor and air pump electrical connection；
The electronic control unit, for closing the Valve EGR when detecting that engine is in idling mode,
And obtain the current pressure values of the pressure sensor acquisition；
The electronic control unit is also used to for the current pressure values being compared with preset calibrations value, and described
When current pressure values are less than the preset calibrations value, reliability detection is carried out to the air pump and obtains testing result；
The electronic control unit is also used to obtain the pressure sensing when the testing result meets preset condition
The system pressure of device acquisition, and the system pressure is compared with preset reference pressure；
The electronic control unit is also used to determine exist when the system pressure is less than the preset reference pressure
Fuel evaporation leakage.
Preferably, the electronic control unit is also used to compare the current pressure values and the preset calibrations value
Compared with, and the air pump is controlled to the fuel tank gas transmission when the current pressure values are less than the preset calibrations value；
It is corresponding to the air pump during the fuel tank gas transmission to be also used to obtain the air pump for the electronic control unit
Current value；
The electronic control unit, is also used to detect whether the current value belongs to predetermined current range, obtains if belonging to
Take the power frequency of the air pump present period；
The electronic control unit, is also used to detect whether the power frequency belongs to predeterminated frequency range, and obtains inspection
Survey result.
Preferably, the electronic control unit is also used to detecting that the current value is not belonging to the predetermined current model
When enclosing, determine that there are failures for the air pump.
Preferably, the electronic control unit is also used to detecting that the power frequency is not belonging to the predeterminated frequency
When range, determine that there are failures for the air pump.
Preferably, the electronic control unit is also used to compare the current pressure values and the preset calibrations value
Compared with, and when the current pressure values are greater than the preset calibrations value, determine that the Valve EGR has leakage.
In addition, to achieve the above object, the present invention also proposes that a kind of fuel oil of above-mentioned fuel evaporation leak detection system steams
Send out leakage detection method, which comprises
The electronic control unit closes the Valve EGR, and obtain when detecting that engine is in idling mode
Take the current pressure values of the pressure sensor acquisition；
The current pressure values are compared by the electronic control unit with preset calibrations value, and in the current pressure
When value is less than the preset calibrations value, reliability detection is carried out to the air pump and obtains testing result；
The electronic control unit obtains the pressure sensor acquisition when the testing result meets preset condition
System pressure, and the system pressure is compared with preset reference pressure；
The electronic control unit determines that there are fuel evaporation when the system pressure is less than the preset reference pressure
Leakage.
Preferably, the current pressure values are compared by the electronic control unit with preset calibrations value, and described
When current pressure values are less than the preset calibrations value, the step of carrying out reliability detection to the air pump and obtain testing result,
Include:
The current pressure values are compared by the electronic control unit with the preset calibrations value, and described current
Pressure value controls the air pump to the fuel tank gas transmission when being less than the preset calibrations value；
The electronic control unit obtains the air pump to the corresponding current value of the air pump described during the fuel tank gas transmission；
The electronic control unit detects whether the current value belongs to predetermined current range, and the gas is obtained if belonging to
Pump the power frequency of present period；
The electronic control unit detects whether the power frequency belongs to predeterminated frequency range, and obtains testing result.
Preferably, it is corresponding to the air pump during the fuel tank gas transmission to obtain the air pump for the electronic control unit
After the step of current value, the method also includes:
The electronic control unit determines the gas when detecting that the current value is not belonging to the predetermined current range
There are failures for pump.
Preferably, the electronic control unit detects whether the power frequency belongs to predeterminated frequency range, and obtains inspection
After the step of surveying result, the method also includes:
The electronic control unit is when detecting that the power frequency is not belonging to the predeterminated frequency range, described in judgement
There are failures for air pump.
Preferably, the electronic control unit closes the canister electromagnetism when detecting that engine is in idling mode
Valve, and after the step of obtaining the current pressure values of the pressure sensor acquisition, the method also includes:
The current pressure values are compared by the electronic control unit with the preset calibrations value, and described current
When pressure value is greater than the preset calibrations value, determine that the Valve EGR has leakage.
Electronic control unit of the present invention closes Valve EGR when detecting that engine is in idling mode, and obtains
The current pressure values of pressure sensor acquisition；Current pressure values are compared with preset calibrations value, and small in current pressure values
When the preset calibrations value, reliability detection is carried out to air pump and obtains testing result；Meet preset condition in testing result
When, the system pressure of pressure sensor acquisition is obtained, and system pressure is compared with preset reference pressure；In system pressure
When less than preset reference pressure, determine that there are fuel evaporation leakages.Detection system of the present invention does not need to vacuumize fuel passage,
Reduce leak detection difficulty, simultaneously because the present invention be first close Valve EGR it is whether faulty to detect solenoid valve, if
Fault-free carries out fault detection to air pump again, and the system pressure for then passing through acquisition again in air pump fault-free judges whether there is
Fuel evaporation leakage, so as to realize the accurate positionin to trouble unit, also improves the accuracy of leak detection.
Detailed description of the invention
Fig. 1 is the fuel evaporation leak detection system structural representation for the hardware running environment that the embodiment of the present invention is related to
Figure；
Fig. 2 is the flow diagram of fuel evaporation leakage detection method first embodiment of the present invention；
Fig. 3 is the flow diagram of fuel evaporation leakage detection method second embodiment of the present invention.
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific embodiment
It should be appreciated that described herein, specific examples are only used to explain the present invention, is not intended to limit the present invention.
Referring to Fig.1, Fig. 1 is the fuel evaporation leak detection system for the hardware running environment that the embodiment of the present invention is related to
Structural schematic diagram.
As shown in Figure 1, the fuel evaporation leak detection system may include: fuel tank 1001, air pump 1002, canister 1003,
Valve EGR 1004, electronic control unit 1005 and pressure sensor 1006.
It will be understood by those skilled in the art that structure shown in Fig. 1 is not constituted to fuel evaporation leak detection system
Restriction, may include perhaps combining certain components or different component layouts than illustrating more or fewer components.
The embodiment of the invention provides a kind of fuel evaporation leak detection systems, and referring to Fig.1, Fig. 1 is fuel oil of the present invention steaming
Give vent to the structural block diagram of leak detection.
In the present embodiment, the fuel evaporation leak detection system, comprising: fuel tank 1001, air pump 1002, canister 1003,
Valve EGR 1004, electronic control unit 1005 and pressure sensor 1006.
Wherein, the canister 1003 respectively with the fuel tank 1001, the air pump 1002 and the Valve EGR
1004 piping connections, the pressure sensor 1006 are set to air inlet pipeline (also referred to as inlet manifold) and the Valve EGR
Between 1004, the electronic control unit 1005 respectively with the Valve EGR 1004, the pressure sensor 1006 and
The air pump 1002 is electrically connected.
In the present embodiment, the electronic control unit 1005, for closing when detecting that engine is in idling mode
The Valve EGR 1004, and obtain the current pressure values that the pressure sensor 1006 acquires；
Should be understood that electronic control unit (Electronic Control Unit, ECU), also known as " car running computer ",
" vehicle-mounted computer ", ECU generally has fault self-diagnosis and defencive function, and when system generates failure, it can also deposited at random
Fault code is automatically recorded in access to memory (Random Access Memory, RAM) and uses safeguard measure from intrinsic program
It is middle to read alternative program to maintain the operating of engine.So-called idling refers to that a kind of working condition of automobile, automobile engine are empty
Referred to as idling when turning, i.e., automobile gears are neutral gear at this time.Valve EGR is then one and is mounted on automobile for reducing because of combustion
Oily discharge vaporization causes air pollution and increases the device of fuel efficiency simultaneously.
It will be appreciated that pressure sensor 1006 described in the present embodiment be used for monitor where pipeline pressure value (or press
Force signal).Under normal circumstances, it when Valve EGR 1004 is closed, should belong between Valve EGR 1004 and air inlet pipeline
The stable sealing room of one pressure, if the collected pressure value of pressure sensor 1006 is greater than a preset calibration value at this time,
Then illustrate that Valve EGR 1004 has leakage or failure.That is, the electronic control unit 1005 in the present embodiment,
It is also used to for the current pressure values being compared with the preset calibrations value, and is greater than described preset in the current pressure values
When calibration value, determine that the Valve EGR 1004 has leakage.
Certainly, if collected pressure value is less than calibration value, illustrate also to need further to detect other positions or component
With the presence or absence of failure or leakage.
In the concrete realization, electronic control unit 1005 first closes carbon when automotive ignition engine is in idling mode
Then tank solenoid valve 1004 obtains the current collected pressure value of the pressure sensor 1006.
The electronic control unit 1005 is also used to for the current pressure values being compared with preset calibrations value, and
When the current pressure values are less than the preset calibrations value, reliability detection is carried out to the air pump 1002 and obtains detection knot
Fruit；
It is set it should be noted that the preset calibrations value can be according to the idling mode of automobile transmitter under normal circumstances
A fixed reference pressure value between Valve EGR and air inlet pipeline.It certainly, should in order to improve the accuracy of leak detection
Preset calibrations value is also possible to a numberical range.The reliability detection can be electronic control unit 1005 and control air pump
Valve work of 1002 and its inside, then carries out reasonability judgement to the electric current and power frequency for flowing through air pump 1002, so-called
Reasonability judgement, that is, judge whether electric current and power frequency belong to corresponding reasonable value range, the reasonable value model
Enclose to set based on practical experience, and the present embodiment is without restriction to this.
In the concrete realization, electronic control unit 1005, can be by the current pressure after getting the current pressure values
Force value is compared with preset calibration value, if the current pressure values are less than the preset calibrations value, shows canister
Solenoid valve 1004 needs further to carry out reliability detection to air pump 1002, then further according to detection there is no leakage or failure
As a result the further detection of fuel evaporation leakage is carried out.
The electronic control unit 1005 is also used to obtain the pressure when the testing result meets preset condition
The system pressure that sensor 1006 acquires, and the system pressure is compared with preset reference pressure；
It should be noted that the testing result meets preset condition, i.e., the above-mentioned electric current for flowing through air pump 1002 and the electricity
It flows corresponding power frequency and belongs to reasonable value range.The system pressure, i.e. air pump 1002 entire pipe-line system when working
(being made of in the present embodiment fuel tank 1001, pump gas 1002, canister 1003, Valve EGR 1004 and pressure sensor 1006)
System pressure value.
It should be understood that the preset reference pressure be it is preset for judge pipe-line system with the presence or absence of leakage or
The reference pressure of failure, specific value the present embodiment is with no restriction.
In the concrete realization, electronic control unit 1005 is obtained when detecting that the testing result meets preset condition
The system pressure that the pressure sensor 1006 acquires, and the system pressure is compared with preset reference pressure, then
Leakage or failure are determined whether there is according to comparison result.
The electronic control unit 1005 is also used to determine when the system pressure is less than the preset reference pressure
There are fuel evaporation leakages.
In the concrete realization, electronic control unit 1005 is detecting the system pressure less than the preset reference pressure
When, determine that there are fuel evaporation leakages；Conversely, determining that there is no combustions if the system pressure is greater than the preset reference pressure
Oil evaporation leakage.
The present embodiment electronic control unit closes Valve EGR when detecting that engine is in idling mode, and obtains
The current pressure values of pressure force snesor acquisition；Current pressure values are compared with preset calibrations value, and in current pressure values
When less than the preset calibrations value, reliability detection is carried out to air pump and obtains testing result；Meet default item in testing result
When part, the system pressure of pressure sensor acquisition is obtained, and system pressure is compared with preset reference pressure；In system pressure
When power is less than preset reference pressure, determine that there are fuel evaporation leakages.The present embodiment detection system does not need to take out fuel passage
Vacuum reduces leak detection difficulty, simultaneously because the present embodiment is first to close Valve EGR to detect whether solenoid valve has
Then failure passes through the system pressure judgement of acquisition if fault-free carries out fault detection to air pump again again in air pump fault-free
It is leaked with the presence or absence of fuel evaporation, so as to realize the accurate positionin to trouble unit, also improves the accurate of leak detection
Property.
Based on above-mentioned first embodiment, the second embodiment of fuel evaporation leak detection system of the present invention is proposed.
In the present embodiment, the electronic control unit 1005 is also used to the current pressure values and the pre- bidding
Definite value is compared, and controls the air pump 1002 to the fuel tank when the current pressure values are less than the preset calibrations value
1001 gas transmissions；
It should be understood that showing carbon if electronic control unit 1005 detects that current pressure values are less than preset calibrations value
Tank solenoid valve 1004 needs further to carry out reliability detection to air pump 1002 there is no leakage or failure.
Specifically, electronic control unit 1005 can start the air pump 1002, and the air pump 1002 is controlled to the oil
1001 gas transmission of case, so that the air pressure in the fuel tank increases.
The electronic control unit 1005 is also used to obtain the air pump 1002 to institute during 1001 gas transmission of fuel tank
State the corresponding current value of air pump 1002；
In the concrete realization, it after electronic control unit 1005 is by dragging down corresponding PIN foot booster air pump 1002, will also adopt
Collect air pump 1002 to the corresponding current value of air pump 1002 during 1001 gas transmission of fuel tank, then detect the current value whether belong to it is pre-
If current range, if being not belonging to, it can directly determine that there are failures for the air pump 1002.
The electronic control unit 1005, is also used to detect whether the current value belongs to predetermined current range, if belonging to
Then obtain the power frequency of 1002 present period of air pump；
In the concrete realization, if electronic control unit 1005 is detecting that the current value belongs to predetermined current range, also
It needs to obtain the power frequency of 1002 present period of air pump, and whether just to detect power frequency when air pump 1002 works
Often, to determine whether air pump 1002 is reliable.
The electronic control unit 1005, is also used to detect whether the power frequency belongs to predeterminated frequency range, and obtains
Take testing result.
In the concrete realization, electronic control unit 1005 also will test electric current frequency after getting above-mentioned power frequency
Whether rate belongs to predeterminated frequency range, illustrate if belonging to (i.e. testing result meets preset condition) air pump 1002 be it is reliable,
It can carry out the test and comparison of pipe-line system pressure.
Further, if electronic control unit 1005 detects that the power frequency is not belonging to the predeterminated frequency range,
It can directly determine that there are failures for the air pump, need not just carry out system pressure detection again at this time, guarantee that testing result is accurate
While property, testing process is reduced.
Current pressure values are compared by the present embodiment electronic control unit with preset calibrations value, and small in current pressure values
Air pump is controlled when preset calibrations value to fuel tank gas transmission；Air pump is obtained to the corresponding current value of air pump during fuel tank gas transmission；Inspection
It surveys whether current value belongs to predetermined current range, the power frequency of air pump present period is obtained if belonging to；Detect power frequency
Whether belong to predeterminated frequency range, and obtain testing result, the present embodiment, to when fuel tank gas transmission, detects the electricity of air pump by air pump
Whether flow valuve and power frequency are in reasonable numberical range, then can determine whether air pump with the presence or absence of event according to testing result
Barrier can accurately diagnose the position for generation of being out of order, improve the accuracy of leak detection when system leaks.
Based on above-mentioned fuel evaporation leak detection system, the present invention also provides a kind of fuel evaporation leakage detection methods.
With reference to Fig. 2, Fig. 2 is the flow diagram of fuel evaporation leakage detection method first embodiment of the present invention.
In the present embodiment, the fuel evaporation leakage detection method the following steps are included:
Step S10: the electronic control unit closes the canister electromagnetism when detecting that engine is in idling mode
Valve, and obtain the current pressure values of the pressure sensor acquisition；
Should be understood that electronic control unit (Electronic Control Unit, ECU), also known as " car running computer ",
" vehicle-mounted computer ", ECU generally has fault self-diagnosis and defencive function, and when system generates failure, it can also deposited at random
Fault code is automatically recorded in access to memory (Random Access Memory, RAM) and uses safeguard measure from intrinsic program
It is middle to read alternative program to maintain the operating of engine.So-called idling refers to that a kind of working condition of automobile, automobile engine are empty
Referred to as idling when turning, i.e., automobile gears are neutral gear at this time.Valve EGR is then one and is mounted on automobile for reducing because of combustion
Oily discharge vaporization causes air pollution and increases the device of fuel efficiency simultaneously.
It will be appreciated that pressure sensor described in the present embodiment be used for monitor where pipeline pressure value (or pressure believe
Number).Under normal circumstances, when Valve EGR is closed, it should belong to a pressure between Valve EGR and air inlet pipeline and stablize
Sealing room, if at this time the collected pressure value of pressure sensor be greater than a preset calibration value, illustrate Valve EGR
In the presence of leakage or failure.That is, the electronic control unit in the present embodiment will also be to the current pressure values and institute
It states preset calibrations value to be compared, and when the current pressure values are greater than the preset calibrations value, determines the canister electromagnetism
There is leakage in valve.
Certainly, if collected pressure value is less than calibration value, illustrate also to need further to detect other positions or component
With the presence or absence of failure or leakage.
In the concrete realization, electronic control unit first closes canister electricity when automotive ignition engine is in idling mode
Then magnet valve obtains the pressure sensor currently collected pressure value.
Step S20: the current pressure values are compared by the electronic control unit with preset calibrations value, and described
When current pressure values are less than the preset calibrations value, reliability detection is carried out to the air pump and obtains testing result；
It is set it should be noted that the preset calibrations value can be according to the idling mode of automobile transmitter under normal circumstances
A fixed reference pressure value between Valve EGR and air inlet pipeline.It certainly, should in order to improve the accuracy of leak detection
Preset calibrations value is also possible to a numberical range.The reliability detection can be electronic control unit control air pump and Qi Nei
The valve in portion works, and then carries out reasonability judgement to the electric current and power frequency for flowing through air pump, so-called reasonability judgement is sentenced
Whether power-off stream and power frequency belong to corresponding reasonable value range, which can be based on practical experience
Setting, the present embodiment are without restriction to this.
In the concrete realization, electronic control unit, can be by the current pressure values after getting the current pressure values
It is compared with preset calibration value, if the current pressure values are less than the preset calibrations value, shows canister electromagnetism
Valve is needed further to carry out reliability detection to air pump, then be fired further according to testing result there is no leakage or failure
The further detection of oil evaporation leakage.
Step S30: the electronic control unit obtains the pressure sensing when the testing result meets preset condition
The system pressure of device acquisition, and the system pressure is compared with preset reference pressure；
It should be noted that the testing result meets preset condition, i.e., the above-mentioned electric current for flowing through air pump and the electric current pair
The power frequency answered belongs to reasonable value range.The system pressure, i.e. air pump entire pipe-line system (the present embodiment when working
In be made of fuel tank, pump gas, canister, Valve EGR and pressure sensor) system pressure value.
It should be understood that the preset reference pressure be it is preset for judge pipe-line system with the presence or absence of leakage or
The reference pressure of failure, specific value the present embodiment is with no restriction.
In the concrete realization, electronic control unit is when detecting that the testing result meets preset condition, described in acquisition
The system pressure of pressure sensor acquisition, and the system pressure is compared with preset reference pressure, then according to comparing
As a result leakage or failure are determined whether there is.
Step S40: the electronic control unit determines exist when the system pressure is less than the preset reference pressure
Fuel evaporation leakage.
In the concrete realization, electronic control unit detect the system pressure be less than the preset reference pressure when,
Determine that there are fuel evaporation leakages；Conversely, determining that fuel oil is not present if the system pressure is greater than the preset reference pressure
Evaporation leakage.
The present embodiment electronic control unit closes Valve EGR when detecting that engine is in idling mode, and obtains
The current pressure values of pressure force snesor acquisition；Current pressure values are compared with preset calibrations value, and in current pressure values
When less than the preset calibrations value, reliability detection is carried out to air pump and obtains testing result；Meet default item in testing result
When part, the system pressure of pressure sensor acquisition is obtained, and system pressure is compared with preset reference pressure；In system pressure
When power is less than preset reference pressure, determine that there are fuel evaporation leakages.The present embodiment detection system does not need to take out fuel passage
Vacuum reduces leak detection difficulty, simultaneously because the present embodiment is first to close Valve EGR to detect whether solenoid valve has
Then failure passes through the system pressure judgement of acquisition if fault-free carries out fault detection to air pump again again in air pump fault-free
It is leaked with the presence or absence of fuel evaporation, so as to realize the accurate positionin to trouble unit, also improves the accurate of leak detection
Property.
With reference to Fig. 3, Fig. 3 is the flow diagram of fuel evaporation leakage detection method second embodiment of the present invention.
Based on above-mentioned fuel evaporation leakage detection method first embodiment, step S20 described in the present embodiment includes:
Step S201: the current pressure values are compared by the electronic control unit with the preset calibrations value, and
The air pump is controlled to the fuel tank gas transmission when the current pressure values are less than the preset calibrations value；
It should be understood that showing canister electricity if electronic control unit detects that current pressure values are less than preset calibrations value
Magnet valve needs further to carry out reliability detection to air pump there is no leakage or failure.
Specifically, electronic control unit can start the air pump, and the air pump is controlled to the fuel tank gas transmission, so that institute
The air pressure stated in fuel tank increases.
Step S202: it is corresponding to the air pump during the fuel tank gas transmission that the electronic control unit obtains the air pump
Current value；
In the concrete realization, after electronic control unit is by dragging down corresponding PIN foot booster air pump, will also acquisition air pump to
The corresponding current value of air pump during fuel tank gas transmission, then detects whether the current value belongs to predetermined current range, if being not belonging to,
It then can directly determine that there are failures for the air pump.
Step S203: the electronic control unit detects whether the current value belongs to predetermined current range, if belonging to
Obtain the power frequency of the air pump present period；
In the concrete realization, it if electronic control unit is detecting that the current value belongs to predetermined current range, also needs
The power frequency of the air pump present period is obtained, and whether the power frequency detected when air pump work is normal, to determine air pump
It is whether reliable.
Step S204: the electronic control unit detects whether the power frequency belongs to predeterminated frequency range, and obtains
Testing result.
In the concrete realization, after getting above-mentioned power frequency, also will test the power frequency is electronic control unit
It is no to belong to predeterminated frequency range, illustrate that air pump is reliably, can to carry out if belonging to (i.e. testing result meets preset condition)
The test and comparison of pipe-line system pressure.
It further, can be straight if electronic control unit detects that the power frequency is not belonging to the predeterminated frequency range
Connecing the judgement air pump, there are failures, need not just carry out system pressure detection again at this time, are guaranteeing testing result accuracy
Meanwhile reducing testing process.
Current pressure values are compared by the present embodiment electronic control unit with preset calibrations value, and small in current pressure values
Air pump is controlled when preset calibrations value to fuel tank gas transmission；Air pump is obtained to the corresponding current value of air pump during fuel tank gas transmission；Inspection
It surveys whether current value belongs to predetermined current range, the power frequency of air pump present period is obtained if belonging to；Detect power frequency
Whether belong to predeterminated frequency range, and obtain testing result, the present embodiment, to when fuel tank gas transmission, detects the electricity of air pump by air pump
Whether flow valuve and power frequency are in reasonable numberical range, then can determine whether air pump with the presence or absence of event according to testing result
Barrier can accurately diagnose the position for generation of being out of order, improve the accuracy of leak detection when system leaks.
It should be noted that, in this document, the terms "include", "comprise" or its any other variant are intended to non-row
His property includes, so that the process, method, article or the system that include a series of elements not only include those elements, and
And further include other elements that are not explicitly listed, or further include for this process, method, article or system institute it is intrinsic
Element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including being somebody's turn to do
There is also other identical elements in the process, method of element, article or system.
The serial number of the above embodiments of the invention is only for description, does not represent the advantages or disadvantages of the embodiments.
Through the above description of the embodiments, those skilled in the art can be understood that above-described embodiment side
Method can be realized by means of software and necessary general hardware platform, naturally it is also possible to by hardware, but in many cases
The former is more preferably embodiment.Based on this understanding, technical solution of the present invention substantially in other words does the prior art
The part contributed out can be embodied in the form of software products, which is stored in a storage medium
In (such as read-only memory/random access memory, magnetic disk, CD), including some instructions are used so that a terminal device (can
To be mobile phone, computer, server, air conditioner or the network equipment etc.) execute method described in each embodiment of the present invention.
The above is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalent structure or equivalent flow shift made by bright specification and accompanying drawing content is applied directly or indirectly in other relevant skills
Art field, is included within the scope of the present invention.
Claims (10)
1. a kind of fuel evaporation leak detection system, which is characterized in that the system comprises: electronic control unit, air pump, oil
Case, canister, Valve EGR and pressure sensor；
Wherein, respectively with the fuel tank, the air pump and the Valve EGR piping connection, the pressure passes the canister
Sensor is set between air inlet pipeline and the Valve EGR, the electronic control unit respectively with the Valve EGR,
The pressure sensor and air pump electrical connection；
The electronic control unit, for closing the Valve EGR, and obtain when detecting that engine is in idling mode
Take the current pressure values of the pressure sensor acquisition；
The electronic control unit is also used to for the current pressure values being compared with preset calibrations value, and described current
When pressure value is less than the preset calibrations value, reliability detection is carried out to the air pump and obtains testing result；
The electronic control unit is also used to obtain the pressure sensor when the testing result meets preset condition and adopt
The system pressure of collection, and the system pressure is compared with preset reference pressure；
The electronic control unit is also used to determine that there are fuel oils when the system pressure is less than the preset reference pressure
Evaporation leakage.
2. the system as claimed in claim 1, which is characterized in that the electronic control unit is also used to the current pressure
Value is compared with the preset calibrations value, and controls the air pump when the current pressure values are less than the preset calibrations value
To the fuel tank gas transmission；
The electronic control unit is also used to obtain the air pump to the corresponding electric current of the air pump described during the fuel tank gas transmission
Value；
The electronic control unit, is also used to detect whether the current value belongs to predetermined current range, and institute is obtained if belonging to
State the power frequency of air pump present period；
The electronic control unit, is also used to detect whether the power frequency belongs to predeterminated frequency range, and obtains detection knot
Fruit.
3. system as claimed in claim 2, which is characterized in that the electronic control unit is also used to detecting the electricity
When flow valuve is not belonging to the predetermined current range, determine that there are failures for the air pump.
4. system as claimed in claim 2, which is characterized in that the electronic control unit is also used to detecting the electricity
When stream frequency is not belonging to the predeterminated frequency range, determine that there are failures for the air pump.
5. system as claimed in claim 2, which is characterized in that the electronic control unit is also used to the current pressure
Value is compared with the preset calibrations value, and when the current pressure values are greater than the preset calibrations value, determines the carbon
There is leakage in tank solenoid valve.
6. a kind of fuel evaporation leak detection based on fuel evaporation leak detection system described in any one of claim 1 to 5
Method, which is characterized in that the described method includes:
The electronic control unit closes the Valve EGR when detecting that engine is in idling mode, and obtains institute
State the current pressure values of pressure sensor acquisition；
The current pressure values are compared by the electronic control unit with preset calibrations value, and small in the current pressure values
When the preset calibrations value, reliability detection is carried out to the air pump and obtains testing result；
The electronic control unit obtains the system that the pressure sensor acquires when the testing result meets preset condition
Pressure, and the system pressure is compared with preset reference pressure；
The electronic control unit determines that there are fuel evaporation to let out when the system pressure is less than the preset reference pressure
Leakage.
7. method as claimed in claim 6, which is characterized in that the electronic control unit is by the current pressure values and presets
Calibration value is compared, and when the current pressure values are less than the preset calibrations value, carries out reliability inspection to the air pump
The step of surveying and obtaining testing result, comprising:
The current pressure values are compared by the electronic control unit with the preset calibrations value, and in the current pressure
Value controls the air pump to the fuel tank gas transmission when being less than the preset calibrations value；
The electronic control unit obtains the air pump to the corresponding current value of the air pump described during the fuel tank gas transmission；
The electronic control unit detects whether the current value belongs to predetermined current range, and the air pump is obtained if belonging to and is worked as
The power frequency of preceding period；
The electronic control unit detects whether the power frequency belongs to predeterminated frequency range, and obtains testing result.
8. the method for claim 7, which is characterized in that the electronic control unit obtains the air pump to the fuel tank
During gas transmission the step of the air pump corresponding current value after, the method also includes:
The electronic control unit determines that the air pump is deposited when detecting that the current value is not belonging to the predetermined current range
In failure.
9. the method for claim 7, which is characterized in that the electronic control unit detects whether the power frequency belongs to
In predeterminated frequency range, and after the step of obtaining testing result, the method also includes:
The electronic control unit determines the air pump when detecting that the power frequency is not belonging to the predeterminated frequency range
There are failures.
10. the method for claim 7, which is characterized in that the electronic control unit is detecting engine in idle
When fast state, the Valve EGR is closed, and after the step of obtaining the current pressure values of the pressure sensor acquisition, institute
State method further include:
The current pressure values are compared by the electronic control unit with the preset calibrations value, and in the current pressure
When value is greater than the preset calibrations value, determine that the Valve EGR has leakage.
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| CN201910444941.7A CN110031160B (en) | 2019-05-24 | 2019-05-24 | Fuel evaporation leakage detection system and method |
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| CN201910444941.7A CN110031160B (en) | 2019-05-24 | 2019-05-24 | Fuel evaporation leakage detection system and method |
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| CN111579169A (en) * | 2020-04-28 | 2020-08-25 | 东风汽车集团有限公司 | Carbon tank ventilation electromagnetic valve leakage detection system and detection method thereof |
| CN112610367A (en) * | 2020-12-18 | 2021-04-06 | 上汽大通汽车有限公司 | Fault diagnosis method for carbon canister electromagnetic valve |
| CN113417767A (en) * | 2021-07-30 | 2021-09-21 | 安徽江淮汽车集团股份有限公司 | Positive pressure type desorption pipeline flow diagnosis method based on fuel tank leakage diagnosis module |
| CN113551856A (en) * | 2021-07-21 | 2021-10-26 | 安徽江淮汽车集团股份有限公司 | Off-line detection method for pipeline leakage of fuel vehicle |
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| CN113911997A (en) * | 2020-11-18 | 2022-01-11 | 山东硕达通机械设备有限公司 | Automatic oiling device for high-flexibility engine assembly ignition test |
| CN112610367A (en) * | 2020-12-18 | 2021-04-06 | 上汽大通汽车有限公司 | Fault diagnosis method for carbon canister electromagnetic valve |
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| CN113551856A (en) * | 2021-07-21 | 2021-10-26 | 安徽江淮汽车集团股份有限公司 | Off-line detection method for pipeline leakage of fuel vehicle |
| CN113417767A (en) * | 2021-07-30 | 2021-09-21 | 安徽江淮汽车集团股份有限公司 | Positive pressure type desorption pipeline flow diagnosis method based on fuel tank leakage diagnosis module |
| CN113790895A (en) * | 2021-09-09 | 2021-12-14 | 安徽江淮汽车集团股份有限公司 | Fuel evaporation diagnosis test method and system based on hardware-in-the-loop |
| CN114618058A (en) * | 2022-03-11 | 2022-06-14 | 浙江宜格企业管理集团有限公司 | Gas pressure control method, system and equipment of beauty instrument |
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