CN112610367A - Fault diagnosis method for carbon canister electromagnetic valve - Google Patents
Fault diagnosis method for carbon canister electromagnetic valve Download PDFInfo
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- CN112610367A CN112610367A CN202011508779.XA CN202011508779A CN112610367A CN 112610367 A CN112610367 A CN 112610367A CN 202011508779 A CN202011508779 A CN 202011508779A CN 112610367 A CN112610367 A CN 112610367A
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- Prior art keywords
- canister
- electromagnetic valve
- carbon
- carbon tank
- valve
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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 measured0(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 the desorption pipeline of the carbon tank has desorption flow; 4) more stringent evaporative emissions 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 closing a carbon tank electromagnetic valve and 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 washing pump0；
S3, opening the carbon tank flushing pump and simultaneously keeping the carbon tank electromagnetic valve closed;
s4, waiting time t1Reading pressure data Pmax measured by a pressure sensor (IV) of the carbon tank flushing pump, and flushing oil vapor adsorbed by the carbon tank (I) into the engine by the carbon tank flushing pump, so that the Pmax is affected differently when a carbon tank electromagnetic valve (five) is in an open state or a closed state;
when P is present0Pmax > P threshold1Judging that the carbon canister electromagnetic valve is in failure, and clamping the carbon canister electromagnetic valve at a normally open position;
when Pmax-P0> P threshold2When the carbon canister electromagnetic valve is in the normally open position, the carbon canister electromagnetic valve is judged to be normally closed;
after determining that the canister solenoid valve may be normally closed, it is further diagnosed whether the canister solenoid valve is stuck normally.
S5, opening the carbon tank electromagnetic valve, and simultaneously keeping the carbon tank flushing pump opened;
s6, waiting time t2Reading pressure data P measured by pressure sensor of carbon tank flushing pump1；
When P is present1Pmax > P threshold3Judging that the carbon canister electromagnetic valve is in failure, and clamping the carbon canister electromagnetic valve at a normally closed position;
when Pmax-P1> P threshold4When the electronic control device is used, the carbon canister electromagnetic valve can be normally opened, and the carbon canister electromagnetic valve is not clamped at a normally closed position.
In the above-described steps S1 to S6, the vehicle is launched so that the vehicle is kept in an 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 of a canister solenoid valve fault diagnostic system of the present invention.
FIG. 2 is a logic diagram of a method for diagnosing a canister solenoid valve fault according to the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1 and 2, a method for diagnosing a failure of a canister solenoid valve comprises the following steps:
s1, starting a vehicle, and closing a carbon tank electromagnetic valve and 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 washing pump0；
S3, opening the carbon tank flushing pump and simultaneously keeping the carbon tank electromagnetic valve closed;
s4, waiting time t1Reading pressure data Pmax measured by a pressure sensor (IV) of the carbon tank flushing pump, and flushing oil vapor adsorbed by the carbon tank (I) into the engine by the carbon tank flushing pump, so that the Pmax is affected differently when a carbon tank electromagnetic valve (five) is in an open state or a closed state;
when P is present0Pmax > P threshold1Judging that the carbon canister electromagnetic valve is in failure, and clamping the carbon canister electromagnetic valve at a normally open position;
when Pmax-P0> P threshold2When the carbon canister electromagnetic valve is in the normally open position, the carbon canister electromagnetic valve is judged to be normally closed;
after determining that the canister solenoid valve may be normally closed, it is further diagnosed whether the canister solenoid valve is stuck normally.
S5, opening the carbon tank electromagnetic valve, and simultaneously keeping the carbon tank flushing pump opened;
s6, waiting time t2Reading pressure data P measured by pressure sensor of carbon tank flushing pump1；
When P is present1Pmax > P threshold3Judging that the carbon canister electromagnetic valve is in failure, and clamping the carbon canister electromagnetic valve at a normally closed position;
when Pmax-P1> P threshold4When the electronic control device is used, the carbon canister electromagnetic valve can be normally opened, and the carbon canister electromagnetic valve is not clamped at a normally closed position.
In the above-described steps S1 to S6, the vehicle is launched so that the vehicle is kept in an 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 claims of the present invention.
Claims (5)
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 flushing pump0；
S3, opening the carbon tank flushing pump (3) and keeping the carbon tank electromagnetic valve (5) closed at the same time;
s4, waiting time t1Reading pressure data Pmax measured by the pressure sensor (4) of the canister flushing pump again, and because the canister flushing pump flushes the oil vapor adsorbed by the canister (2) into the engine, the canister electromagnetic valve (5) is in an open state or a closed state to have different influences on the Pmax; when the canister solenoid valve is in a closed state, oil vapor can enter the desorption pipeline (10) from the canister (2) due to the operation of the canister flush pump, so that Pmax is higher than P0(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 (10) from the canister (2), so that Pmax is not higher than P0；
When P is present0Pmax > P threshold1When 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 state1The working performance of the carbon tank flushing pump is related;
when Pmax-P0> P threshold2When the valve is closed, the solenoid valve (5) of the canister can be normally closed,the canister solenoid valve is not stuck in the normally open position, P threshold2The 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 idle 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 t2Reading pressure data P1 measured by a pressure sensor (4) of the canister flushing pump, and entering oil vapor in a desorption pipeline (10) into an engine (9) after a canister electromagnetic valve (5) is opened, so that when P1 is lower than Pmax, the pressure gradually approaches P10(ii) a When the canister electromagnetic valve (5) cannot be normally opened, P1 is higher than Pmax because the canister flushing pump (3) is in an open state;
when P1-Pmax > P threshold3When 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 set3The working performance of the carbon tank flushing pump is related;
when Pmax-P1 > P threshold4When 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 determined4And P0It 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 fault 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.
5. The canister solenoid valve fault diagnosis method according to claim 4, characterized in that: in step S4, it is first determined whether the canister solenoid valve is stuck in the normally open position, and if it is determined that the solenoid valve is stuck in the normally open position, the diagnosis is ended.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011508779.XA CN112610367B (en) | 2020-12-18 | 2020-12-18 | Fault diagnosis method for carbon canister electromagnetic valve |
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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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| CN112610367A true CN112610367A (en) | 2021-04-06 |
| CN112610367B CN112610367B (en) | 2022-10-04 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1992017698A1 (en) * | 1991-03-28 | 1992-10-15 | Siemens Aktiengesellschaft | Diagnostic system for canister purge system |
| US20030015179A1 (en) * | 2001-07-19 | 2003-01-23 | Nissan Motor Co., Ltd. | Fuel vapor treatment system with failure diagnosis apparatus |
| 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 |
| US20190353119A1 (en) * | 2018-05-18 | 2019-11-21 | Hyundai Motor Company | Active canister purge system and diagnostic method thereof |
-
2020
- 2020-12-18 CN CN202011508779.XA patent/CN112610367B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1992017698A1 (en) * | 1991-03-28 | 1992-10-15 | Siemens Aktiengesellschaft | Diagnostic system for canister purge system |
| US20030015179A1 (en) * | 2001-07-19 | 2003-01-23 | Nissan Motor Co., Ltd. | Fuel vapor treatment system with failure diagnosis apparatus |
| 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 |
| US20190353119A1 (en) * | 2018-05-18 | 2019-11-21 | Hyundai Motor Company | Active canister purge system and diagnostic method thereof |
| 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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| CN112610367B (en) | 2022-10-04 |
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