CN112610367B - Fault diagnosis method for carbon canister electromagnetic valve - Google Patents
Fault diagnosis method for carbon canister electromagnetic valve Download PDFInfo
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- CN112610367B CN112610367B CN202011508779.XA CN202011508779A CN112610367B CN 112610367 B CN112610367 B CN 112610367B CN 202011508779 A CN202011508779 A CN 202011508779A CN 112610367 B CN112610367 B CN 112610367B
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- Prior art keywords
- electromagnetic valve
- canister
- carbon
- carbon tank
- flushing pump
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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
- F02M25/0809—Judging failure of purge control system
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/003—Adding fuel vapours, e.g. drawn from engine fuel reservoir
- F02D41/0042—Controlling the combustible mixture as a function of the canister purging, e.g. control of injected fuel to compensate for deviation of air fuel ratio when purging
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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
- F02M25/089—Layout of the fuel vapour installation
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- 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
Abstract
The invention relates to a fault diagnosis method for a carbon tank electromagnetic valve, which is characterized in that the pressure of a desorption pipeline is measured through a pressure sensor on a carbon tank flushing pump, and when a vehicle is in an idling working condition and the carbon tank flushing pump and the carbon tank electromagnetic valve are closed, the pressure P of the desorption pipeline is measured 0 (ii) a And (4) judging the fault of the carbon tank electromagnetic valve by utilizing the pressure change of the desorption pipeline after the carbon tank flushing pump and the carbon tank electromagnetic valve are opened. According to the diagnosis method for the desorption pipeline of the carbon tank, disclosed by the invention, the fault diagnosis of the normally open or normally closed carbon tank electromagnetic valve is realized through the pressure sensor of the carbon tank flushing pump, the fault diagnosis of the carbon tank electromagnetic valve can be realized without adding an additional sensor, meanwhile, the wiring harness arrangement matched with the sensor is simplified, and the system structure is simplified.
Description
Technical Field
The invention relates to a fault diagnosis method for vehicle hardware, in particular to a fault diagnosis method for a carbon canister electromagnetic valve, and belongs to the technical field of vehicle control testing.
Background
With the implementation of the emission regulation of the sixth stage in China, the requirements on the evaporation system of the gasoline engine are stricter, and the regulation requirements mainly comprise the following 4 points: 1) Newly adding a leakage diagnosis requirement on an evaporation system; 2) Newly adding a control requirement on emissions in the refueling process; 3) Newly adding a diagnosis requirement on whether a desorption pipeline of the carbon tank has desorption flow; 4) More stringent evaporative emission control requirements.
Aiming at the newly increased diagnosis requirement on the desorption flow of the carbon tank on the desorption pipeline of the carbon tank by the national six regulations, the engine controller needs to diagnose whether the electromagnetic valve of the carbon tank has a fault or not: whether the canister solenoid valve can be normally opened or closed. Currently, a pressure sensor may be installed on the oil tank to determine whether the solenoid valve has a fault by measuring the pressure of the evaporation system (oil tank, canister). Although the diagnostic scheme is reliable, a pressure sensor needs to be arranged on the oil tank, and the additional oil tank pressure sensor also involves the problems of interference, sealing, safety and the like of a sensor wiring harness, and further increases the cost of the whole vehicle.
Disclosure of Invention
The invention aims to provide a fault diagnosis method for a carbon canister electromagnetic valve, which is characterized in that the existing sensor and actuator on a carbon canister are utilized to complete the diagnosis of the carbon canister electromagnetic valve, a pressure sensor is not required to be arranged on an oil tank, the cost is reduced, meanwhile, the wiring harness arrangement of the sensor is simplified, the vehicle system structure is simplified, and the light weight requirement of a compact vehicle type is further met.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a fault diagnosis method for a carbon canister electromagnetic valve is used for judging the fault of the carbon canister electromagnetic valve by utilizing the pressure change of a desorption pipeline after a carbon canister flushing pump and the carbon canister electromagnetic valve are opened. The method comprises the following steps:
s1, starting a vehicle, and simultaneously closing a carbon tank electromagnetic valve and closing a carbon tank flushing pump when the water temperature of an engine is higher than 80 ℃ and the engine is in an idling working condition;
s2, reading pressure data P measured by a pressure sensor of the carbon tank flushing pump 0 ；
S3, opening the carbon tank flushing pump, and simultaneously keeping the carbon tank electromagnetic valve closed;
s4, waiting time t 1 Then, reading pressure data Pmax measured by a pressure sensor of the canister flushing pump, and because the canister flushing pump flushes the oil vapor adsorbed by the canister into the engine, different influences are generated on the Pmax when the canister electromagnetic valve is in an open state or a closed state;
when P is 0 Pmax > P threshold 1 When the fault occurs, the carbon canister electromagnetic valve is judged, and the carbon canister electromagnetic valve is clamped at a normally open position;
when Pmax-P 0 Greater than P threshold 2 When the carbon canister electromagnetic valve is closed, judging that the carbon canister electromagnetic valve can be normally closed and is not clamped at a normally open position;
after determining that the canister solenoid valve can be normally closed, it is further diagnosed whether the canister solenoid valve is stuck normally closed.
S5, opening a carbon tank electromagnetic valve, and simultaneously keeping a carbon tank flushing pump open;
s6, waiting time t 2 Reading pressure data P measured by a pressure sensor of the canister flushing pump 1 ；
When P is 1 Pmax > P threshold 3 When the fault occurs, the carbon canister electromagnetic valve is judged, and the carbon canister electromagnetic valve is clamped at a normally closed position;
when Pmax-P 1 Greater than P threshold 4 And when the carbon canister electromagnetic valve is not blocked at the normally closed position, the carbon canister electromagnetic valve is judged to be normally opened.
In the above-described steps S1 to S6, the vehicle is started to keep the vehicle in the idling state.
The invention has the beneficial effects that: the invention utilizes the existing sensor and actuator to complete the diagnosis of the carbon canister electromagnetic valve, and does not need to install a pressure sensor on the oil tank, thereby not only reducing the cost, but also simplifying the wiring harness arrangement of the sensor, simplifying the vehicle system structure and further meeting the light weight requirement of compact vehicle types.
Drawings
Fig. 1 is a vehicle layout diagram of a canister solenoid valve malfunction diagnosis system in the present invention.
FIG. 2 is a logic diagram of a method for diagnosing a canister solenoid valve fault according to the present invention.
Description of the drawings: 1-oil tank, 2-canister, 3-canister flushing pump, 4-pressure sensor, 5-canister electromagnetic valve, 6-air flow meter, 7-supercharger, 8-supercharging intercooler, and 9-engine.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1 and fig. 2, a method for diagnosing a failure of a canister solenoid valve comprises the following steps:
s1, starting a vehicle, and simultaneously closing a carbon tank electromagnetic valve 5 and closing a carbon tank flushing pump 3 when the water temperature of an engine is higher than 80 ℃ and the engine is in an idling working condition;
s2, reading pressure data P measured by a pressure sensor 4 of the carbon tank flushing pump 0 ；
S3, opening the carbon tank flushing pump 3, and simultaneously keeping the carbon tank electromagnetic valve 5 closed;
s4, waiting time t 1 Reading pressure data Pmax measured by a pressure sensor 4 of the canister flushing pump, wherein the canister flushing pump flushes oil vapor adsorbed by the canister 2 into the engine 9, so that the Pmax is affected differently when the canister electromagnetic valve 5 is in an open state or a closed state;
when P is 0 Pmax > P threshold 1 When the fault occurs, the carbon canister electromagnetic valve 5 is judged, and the carbon canister electromagnetic valve is clamped at a normally open position;
when Pmax-P 0 > P threshold 2 When the carbon canister electromagnetic valve 5 is normally closed, the carbon canister electromagnetic valve is not clamped at a normally open position;
after determining that the canister solenoid valve 5 can be normally closed, it is further diagnosed whether the canister solenoid valve 5 is stuck in the normally closed position.
S5, opening the carbon tank electromagnetic valve 5, and simultaneously keeping the carbon tank flushing pump 3 open;
s6, waiting time t 2 Reading pressure data P measured by a pressure sensor 4 of the canister flushing pump 1 ；
When P is 1 Pmax > P threshold 3 When the fault occurs, the fault of the carbon canister electromagnetic valve 5 is judged, and the carbon canister electromagnetic valve is clamped at a normally closed position;
when Pmax-P 1 > P threshold 4 When the valve is opened, the canister solenoid valve 5 is normally opened, and the canister solenoid valve is not stuck at a normally closed position.
In the above-described steps S1 to S6, the vehicle is started to keep the vehicle in the idling state.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the present invention.
Claims (4)
1. A fault diagnosis method for a carbon canister electromagnetic valve is characterized by comprising the following steps: carrying out fault judgment on the carbon tank electromagnetic valve by utilizing the pressure change of the desorption pipeline after the carbon tank flushing pump and the carbon tank electromagnetic valve are opened; the method comprises the following steps:
s1, starting a vehicle, and closing a carbon canister electromagnetic valve (5) and a carbon canister flushing pump (3) when the water temperature of an engine is higher than 80 ℃ and the engine is in an idling working condition;
s2, reading pressure data P measured by a pressure sensor (4) of the carbon tank washing pump 0 ；
S3, opening the carbon tank flushing pump (3) and keeping the carbon tank electromagnetic valve (5) closed at the same time;
s4, firstly, judging whether the carbon canister electromagnetic valve is clamped at a normally open position, and if the carbon canister electromagnetic valve is clamped at the normally open position, finishing diagnosis; waiting time t 1 And reading the pressure data Pmax measured by the pressure sensor (4) of the canister flushing pump again, wherein the canister flushing pump flushes the oil vapor adsorbed by the canister (2) into the engine, so that the opening or closing state of the canister electromagnetic valve (5) has different influences on the Pmax: when the carbon canister electromagnetic valve is in a closed state, because the carbon canister flushing pump runs, oil vapor can enter the desorption pipeline from the carbon canister (2), and Pmax is higher than P 0 (ii) a When the canister electromagnetic valve is in an open state, oil vapor can enter the engine (9) from the canister electromagnetic valve (5) after passing through the desorption pipeline from the canister (2), so that Pmax is not higher than P 0 ；
When P is 0 Pmax > P threshold 1 When the electromagnetic valve is in failure, the electromagnetic valve (5) of the carbon canister is judged to be normally closed, the electromagnetic valve of the carbon canister is in failure, the electromagnetic valve is in a normally open position, and the valve P is in a valve opening state 1 The working performance of the carbon tank flushing pump is related;
when Pmax-P 0 Greater than P threshold 2 When the pressure sensor detects that the carbon canister electromagnetic valve (5) can be normally closed, the carbon canister electromagnetic valve is not clamped at a normally open position, and the P threshold 2 The pressure of a pipeline between the air flow meter (6) and the supercharger (7) is related to the pressure of the pipeline when the engine is in an idling working condition;
after the carbon canister electromagnetic valve (5) can be normally closed, further diagnosing whether the carbon canister electromagnetic valve (5) is normally closed or not;
s5, opening the carbon tank electromagnetic valve (5) and simultaneously keeping the carbon tank flushing pump (3) open;
s6, waiting time t 2 And pressure data P1 measured by a pressure sensor (4) of the carbon tank flushing pump is read, and oil vapor in a desorption pipeline can enter into the carbon tank flushing pump after a carbon tank electromagnetic valve (5) is openedThe engine (9) therefore, when P1 is lower than Pmax, it gradually approaches P 0 (ii) a When the canister electromagnetic valve (5) cannot be normally opened, the canister flushing pump (3) is in an open state, so that P1 is higher than Pmax;
when P1-Pmax > P threshold 3 When the valve is in use, the failure of the canister electromagnetic valve (5) caused by the failure of the canister electromagnetic valve is judged, the canister electromagnetic valve is clamped at a normally closed position, and the P threshold is set 3 The working performance of the carbon tank flushing pump is related;
when Pmax-P1 > P threshold 4 When the valve is opened, the solenoid valve (5) is normally opened, the solenoid valve is not blocked at the normally closed position, and the valve P is determined 4 And P 0 It is related.
2. The canister solenoid valve fault diagnosis method according to claim 1, characterized by: the fault diagnosis of the carbon tank electromagnetic valve is realized by utilizing the pressure sensor of the existing carbon tank flushing pump.
3. The canister solenoid valve malfunction diagnosis method according to claim 2, characterized in that: the diagnosis is activated only after the engine water temperature is higher than 80 ℃.
4. The canister solenoid valve fault diagnosis method according to claim 1, characterized in that: in the steps S1 to S6, the vehicle is maintained in the idling state.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011508779.XA CN112610367B (en) | 2020-12-18 | 2020-12-18 | Fault diagnosis method for carbon canister electromagnetic valve |
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| CN202011508779.XA CN112610367B (en) | 2020-12-18 | 2020-12-18 | Fault diagnosis method for carbon canister electromagnetic valve |
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| CN112610367A CN112610367A (en) | 2021-04-06 |
| CN112610367B true CN112610367B (en) | 2022-10-04 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1992017698A1 (en) * | 1991-03-28 | 1992-10-15 | Siemens Aktiengesellschaft | Diagnostic system for canister purge system |
| JP2003035216A (en) * | 2001-07-19 | 2003-02-07 | Nissan Motor Co Ltd | Failure diagnosing device for fuel vaporized gas treating device |
| CN102678396A (en) * | 2012-05-08 | 2012-09-19 | 联合汽车电子有限公司 | Diagnostic method for carbon canister flow |
| CN110031160A (en) * | 2019-05-24 | 2019-07-19 | 安徽江淮汽车集团股份有限公司 | Fuel evaporation leak detection system and method |
| DE102018216013A1 (en) * | 2018-05-15 | 2019-11-21 | Hyundai Motor Company | Canister purge control method for a vehicle |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20190131947A (en) * | 2018-05-18 | 2019-11-27 | 현대자동차주식회사 | Diagnostic apparatus and method for diagnising active canister purge systme |
-
2020
- 2020-12-18 CN CN202011508779.XA patent/CN112610367B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1992017698A1 (en) * | 1991-03-28 | 1992-10-15 | Siemens Aktiengesellschaft | Diagnostic system for canister purge system |
| JP2003035216A (en) * | 2001-07-19 | 2003-02-07 | Nissan Motor Co Ltd | Failure diagnosing device for fuel vaporized gas treating device |
| CN102678396A (en) * | 2012-05-08 | 2012-09-19 | 联合汽车电子有限公司 | Diagnostic method for carbon canister flow |
| DE102018216013A1 (en) * | 2018-05-15 | 2019-11-21 | Hyundai Motor Company | Canister purge control method for a vehicle |
| CN110031160A (en) * | 2019-05-24 | 2019-07-19 | 安徽江淮汽车集团股份有限公司 | Fuel evaporation leak detection system and method |
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| CN112610367A (en) | 2021-04-06 |
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