CN116906203A - Leakage monitoring method for fuel evaporation system of high-pressure oil tank - Google Patents
Leakage monitoring method for fuel evaporation system of high-pressure oil tank Download PDFInfo
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- CN116906203A CN116906203A CN202311051640.0A CN202311051640A CN116906203A CN 116906203 A CN116906203 A CN 116906203A CN 202311051640 A CN202311051640 A CN 202311051640A CN 116906203 A CN116906203 A CN 116906203A
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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
- F02D41/22—Safety or indicating devices for abnormal conditions
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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
- F02M25/0836—Arrangement of valves controlling the admission of fuel vapour to an engine, e.g. valve being disposed between fuel tank or absorption canister and intake manifold
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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
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D2041/224—Diagnosis of the fuel system
- F02D2041/225—Leakage detection
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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
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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)
Abstract
The invention provides a leakage monitoring method of a fuel evaporation system of a high-pressure oil tank, which comprises the following steps: an oil tank isolation valve is arranged between the carbon tank and the high-pressure oil tank, and an oil tank pressure sensor is arranged in the high-pressure oil tank so as to detect the pressure in the high-pressure oil tank; a connecting pipeline between the carbon tank and the engine is provided with a carbon tank electromagnetic valve and a vacuum degree pressure sensor; in the leakage detection process, when the actual pressure of the oil tank is higher than a set pressure threshold value, keeping the oil tank isolation valve closed, and using the oil tank isolation valve as a boundary to diagnose whether the fuel evaporation system has leakage or not by using a partition mode; and when the actual pressure of the fuel tank is lower than the set pressure threshold value, opening the fuel tank isolation valve, and diagnosing whether the fuel evaporation system has leakage or not by using the integral mode. The invention can reduce the risk of evaporation and emission and improve the convenience and safety of leakage monitoring.
Description
Technical Field
The invention relates to the technical field of leakage monitoring of high-pressure oil tanks, in particular to a leakage monitoring method of a fuel evaporation system of a high-pressure oil tank.
Background
In the state six environmental regulations, emissions requirements and leakage monitoring requirements of fuel vaporization systems are specified at the same time. In order to meet the requirements of evaporation emission regulations, a plug-in type hybrid electric vehicle generally adopts a high-pressure oil tank, an isolation valve is additionally arranged between the oil tank and a carbon tank, and high-pressure fuel vapor is sealed in the high-pressure resistant oil tank. Because of the existence of the oil tank isolation valve, in order to perform leakage diagnosis, the isolation valve needs to be opened firstly for pressure relief, then the diagnosis is performed by using a traditional vacuumizing and pressure maintaining method or an inflating pump pressurizing method, more fuel vapor can be generated in the process, and certain pollution is caused to the environment. Meanwhile, the test for emission of evaporative pollutants requires that the plug-in hybrid electric vehicle needs to be tested in a full-power state, the running time of an engine in a test cycle is short, desorption flow is insufficient for flushing the carbon tank, and the use effect of the carbon tank is affected. Therefore, how to efficiently and conveniently monitor leakage of the high-pressure oil tank evaporation system so as to reduce the evaporation emission risk has important significance.
Disclosure of Invention
The invention provides a leakage monitoring method for a fuel evaporation system of a high-pressure oil tank, which solves the problems that the existing fuel evaporation system of the high-pressure oil tank needs to be subjected to pressure relief for multiple times, is inconvenient and has discharge pollution, can reduce the evaporation discharge risk, and improves the convenience and safety of leakage monitoring.
In order to achieve the above object, the present invention provides the following technical solutions:
a leakage monitoring method for a fuel evaporation system of a high-pressure oil tank comprises the following steps:
an oil tank isolation valve is arranged between the carbon tank and the high-pressure oil tank, and an oil tank pressure sensor is arranged in the high-pressure oil tank so as to detect the pressure in the high-pressure oil tank;
a connecting pipeline between the carbon tank and the engine is provided with a carbon tank electromagnetic valve and a vacuum degree pressure sensor;
in the leakage detection process, when the actual pressure of the oil tank is higher than a set pressure threshold value, keeping the oil tank isolation valve closed, and using the oil tank isolation valve as a boundary to diagnose whether the fuel evaporation system has leakage or not by using a partition mode;
and when the actual pressure of the fuel tank is lower than the set pressure threshold value, opening the fuel tank isolation valve, and diagnosing whether the fuel evaporation system has leakage or not by using the integral mode.
Preferably, the method further comprises:
when the partition mode diagnosis is carried out, judging whether leakage exists in a high-pressure area or not through detecting the pressure change of the high-pressure oil tank by an oil tank pressure sensor;
and after the engine is used for vacuumizing the low-pressure area, judging whether leakage exists in the low-pressure area or not according to the vacuum degree change detected by the vacuum degree pressure sensor.
Preferably, the overall pattern diagnosis process includes:
closing the oil tank isolation valve, acquiring an oil tank pressure sensor signal after the diagnosis condition is met, opening the oil tank isolation valve if the pressure is smaller than a set pressure threshold value, and entering an integral diagnosis mode;
after the oil tank isolation valve is opened, the carbon tank is continuously flushed until the load is lower than a set load threshold value, then a carbon tank ventilation valve arranged on an exhaust pipe of the carbon tank is closed, a carbon tank electromagnetic valve is opened for vacuumizing, when the vacuum degree is lower than the set vacuum degree threshold value after the set time, a large leakage fault is reported, diagnosis is finished, and after the vacuum degree is higher than the set vacuum degree threshold value, the carbon tank electromagnetic valve is closed;
and acquiring a vacuum degree signal measured by a vacuum degree pressure sensor, recording a vacuum degree-time curve after the vehicle is stopped, and judging that the fuel evaporation system is free of leakage when the pressure change rate of the calculated vacuum degree is smaller than a calibrated diagnosis pressure threshold value.
Preferably, the diagnosing whether a leak exists in the fuel vaporization system using the global mode includes;
after the oil tank isolation valve is opened, acquiring the load of the carbon tank, judging whether the load of the carbon tank is lower than a set load threshold, and if not, continuing flushing the carbon tank;
if so, closing a carbon tank ventilation valve arranged on the carbon tank exhaust pipe, opening a carbon tank electromagnetic valve, and vacuumizing the carbon tank by operating an engine;
judging whether the vacuum degree is larger than a set vacuum degree threshold value, if not, judging that a large leakage fault exists;
if so, closing the carbon tank electromagnetic valve, judging whether the pressure change rate of the vacuum degree is smaller than a diagnosis pressure threshold value, if not, judging that the leakage is more than 1mm, and if so, judging that the leakage is not caused.
Preferably, the partition mode diagnosis process includes:
closing an oil tank isolation valve, acquiring an oil tank pressure sensor signal, if the pressure is greater than a set pressure threshold value, keeping the oil tank isolation valve closed, and entering a partition independent diagnosis mode;
acquiring the pressure of the oil tank, recording the pressure-time change curve of the oil tank after the vehicle is stationary, calculating the leakage area according to the small hole leakage model, and judging that no leakage exists when the leakage area is smaller than the set area threshold value;
closing a carbon tank ventilation valve arranged on a carbon tank exhaust pipe, opening a carbon tank electromagnetic valve to vacuumize, wherein the vacuum degree is smaller than a set vacuum degree threshold value, reporting a large leakage fault, and closing the carbon tank electromagnetic valve after diagnosis is finished and the vacuum degree is larger than the set vacuum degree threshold value;
and acquiring a vacuum degree signal measured by a vacuum degree pressure sensor, recording a vacuum degree-time curve after the vehicle is stopped, calculating the leakage area according to the small hole leakage model, and judging that no leakage exists when the leakage area is smaller than a set area threshold value.
Preferably, the diagnosing whether the fuel evaporation system has leakage using the partition mode includes:
after the oil tank isolation valve is closed, acquiring the load of the carbon tank, judging whether the load of the carbon tank is lower than a set load threshold, and if not, continuing flushing the carbon tank;
if so, acquiring the pressure of the oil tank, calculating the leakage area after the vehicle is stationary, and judging whether the leakage area is smaller than a set area threshold value;
if not, entering a whole mode diagnosis to carry out leakage diagnosis;
if yes, acquiring the load of the carbon tank again, judging whether the load of the carbon tank is lower than a set load threshold, and if not, continuing flushing the carbon tank;
if the air inlet valve is closed, a carbon tank ventilation valve arranged on the carbon tank exhaust pipe is closed, a carbon tank electromagnetic valve is opened, and the carbon tank is vacuumized by operating an engine;
judging whether the vacuum degree is larger than a set vacuum degree threshold value, if not, judging that a large leakage fault exists;
if so, closing the carbon tank electromagnetic valve, calculating the leakage area after the vehicle is stationary, judging whether the leakage area is smaller than a set area threshold, if not, entering an integral mode diagnosis for leakage diagnosis, and if so, judging that no leakage exists.
The invention provides a leakage monitoring method of a fuel evaporation system of a high-pressure oil tank, which is characterized in that according to a signal of a pressure sensor in the high-pressure oil tank, when the actual pressure of the oil tank is higher than a set pressure threshold value, an oil tank isolation valve is kept closed, the oil tank isolation valve is used as a boundary, a partition mode is used for diagnosis, and when the actual pressure of the oil tank is lower than the set pressure threshold value, the oil tank isolation valve is opened, and an integral mode is used for diagnosis. The problem of current high pressure fuel tank fuel evaporation system leak monitoring need multiple pressure release, exist inconvenient and emission pollution is solved, evaporation emission risk can be reduced, leak monitoring's convenience and security are improved.
Drawings
In order to more clearly illustrate the specific embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described.
Fig. 1 is a schematic diagram of a leakage monitoring method of a fuel evaporation system of a high-pressure fuel tank.
Fig. 2 is a schematic diagram of an overall mode diagnosis flow provided in an embodiment of the present invention.
FIG. 3 is a schematic diagram of a partition mode diagnosis flow provided by an embodiment of the present invention.
Detailed Description
In order to make the solution of the embodiment of the present invention better understood by those skilled in the art, the embodiment of the present invention is further described in detail below with reference to the accompanying drawings and embodiments.
Aiming at the problems of leakage monitoring of the current high-pressure oil tank fuel evaporation system, the invention provides a method for monitoring leakage of the high-pressure oil tank fuel evaporation system, which solves the problems that the leakage monitoring of the current high-pressure oil tank fuel evaporation system needs to be performed for a plurality of times, is inconvenient and has pollution emission, can reduce the evaporation emission risk, and improves the convenience and safety of the leakage monitoring.
As shown in fig. 1, a method for monitoring leakage of a fuel evaporation system of a high-pressure oil tank includes:
101: an oil tank isolation valve is arranged between the carbon tank and the high-pressure oil tank, and an oil tank pressure sensor is arranged in the high-pressure oil tank to detect the pressure in the high-pressure oil tank.
102: and a connecting pipeline between the carbon tank and the engine is provided with a carbon tank electromagnetic valve and a vacuum degree pressure sensor.
103: and in the leakage detection process, when the actual pressure of the fuel tank is higher than a set pressure threshold value, keeping the fuel tank isolation valve closed, and using the fuel tank isolation valve as a boundary to diagnose whether the fuel evaporation system has leakage or not by using a partition mode.
104: and when the actual pressure of the fuel tank is lower than the set pressure threshold value, opening the fuel tank isolation valve, and diagnosing whether the fuel evaporation system has leakage or not by using the integral mode.
Specifically, an oil tank pressure sensor is arranged in a high-pressure oil tank to collect oil tank pressure signals, when the actual pressure of the oil tank is higher than a set pressure threshold value, an oil tank isolation valve is kept closed, the oil tank isolation valve is used as a boundary, partition mode diagnosis is used, and when the actual pressure of the oil tank is lower than the set pressure threshold value, the oil tank isolation valve is opened, and integral mode diagnosis is used. The method reduces the action times of the oil tank isolation valve, improves the diagnosis efficiency and reduces the risk of evaporating and discharging pollutants by a diagnosis method combining integral diagnosis and partition diagnosis.
The method further comprises the steps of:
when the partition mode diagnosis is performed, whether leakage exists in the high-pressure area is judged by detecting the pressure change of the high-pressure oil tank through the oil tank pressure sensor.
And after the engine is used for vacuumizing the low-pressure area, judging whether leakage exists in the low-pressure area or not according to the vacuum degree change detected by the vacuum degree pressure sensor.
Further, the overall pattern diagnosis process includes:
s1: closing the oil tank isolation valve, acquiring an oil tank pressure sensor signal after the diagnosis condition is met, opening the oil tank isolation valve if the pressure is smaller than a set pressure threshold value, and entering an integral diagnosis mode;
s2, after the oil tank isolation valve is opened, the carbon tank is continuously flushed until the load is lower than a set load threshold, then a carbon tank ventilation valve arranged on an exhaust pipe of the carbon tank is closed, a carbon tank electromagnetic valve is opened for vacuumizing, when the vacuum degree is lower than the set vacuum degree threshold after set time, a large leakage fault is reported, diagnosis is finished, and when the vacuum degree is higher than the set vacuum degree threshold, the carbon tank electromagnetic valve is closed;
s3: and acquiring a vacuum degree signal measured by a vacuum degree pressure sensor, recording a vacuum degree-time curve after the vehicle is stopped, and judging that the fuel evaporation system is free of leakage when the pressure change rate of the calculated vacuum degree is smaller than a calibrated diagnosis pressure threshold value.
Still further, as shown in FIG. 2, the use of the global mode to diagnose whether a leak exists in the fuel vaporization system includes;
after the oil tank isolation valve is opened, acquiring the load of the carbon tank, judging whether the load of the carbon tank is lower than a set load threshold, and if not, continuing flushing the carbon tank;
if so, closing a carbon tank ventilation valve arranged on the carbon tank exhaust pipe, opening a carbon tank electromagnetic valve, and vacuumizing the carbon tank by operating an engine;
judging whether the vacuum degree is larger than a set vacuum degree threshold value, if not, judging that a large leakage fault exists;
if so, closing the carbon tank electromagnetic valve, judging whether the pressure change rate of the vacuum degree is smaller than a diagnosis pressure threshold value, if not, judging that the leakage is more than 1mm, and if so, judging that the leakage is not caused.
Further, the partition mode diagnostic process includes:
s4: and closing the oil tank isolation valve, acquiring an oil tank pressure sensor signal, and if the pressure is greater than a set pressure threshold value, keeping the oil tank isolation valve closed, and entering a partition independent diagnosis mode.
S5: and acquiring the pressure of the oil tank, recording the pressure-time change curve of the oil tank after the vehicle is stationary, calculating the leakage area according to the small hole leakage model, and judging that no leakage exists when the leakage area is smaller than the set area threshold.
S6: closing a carbon tank ventilation valve arranged on a carbon tank exhaust pipe, opening a carbon tank electromagnetic valve for vacuumizing, wherein the vacuum degree is smaller than a set vacuum degree threshold value, reporting a large leakage fault, and closing the carbon tank electromagnetic valve after the diagnosis is finished and the vacuum degree is larger than the set vacuum degree threshold value.
S7: and acquiring a vacuum degree signal measured by a vacuum degree pressure sensor, recording a vacuum degree-time curve after the vehicle is stopped, calculating the leakage area according to the small hole leakage model, and judging that no leakage exists when the leakage area is smaller than a set area threshold value.
S8: if the leakage area calculated in any one of the steps S5 and S7 is larger than the set area threshold, the whole diagnosis mode is entered, and the steps S2-S3 are repeated.
Still further, as shown in FIG. 3, the use of the zone mode to diagnose whether a leak exists in the fuel vaporization system includes:
after the oil tank isolation valve is closed, acquiring the load of the carbon tank, judging whether the load of the carbon tank is lower than a set load threshold, and if not, continuing flushing the carbon tank;
if so, acquiring the pressure of the oil tank, calculating the leakage area after the vehicle is stationary, and judging whether the leakage area is smaller than a set area threshold value;
if not, entering a whole mode diagnosis to carry out leakage diagnosis;
if yes, acquiring the load of the carbon tank again, judging whether the load of the carbon tank is lower than a set load threshold, and if not, continuing flushing the carbon tank;
if the air inlet valve is closed, a carbon tank ventilation valve arranged on the carbon tank exhaust pipe is closed, a carbon tank electromagnetic valve is opened, and the carbon tank is vacuumized by operating an engine;
judging whether the vacuum degree is larger than a set vacuum degree threshold value, if not, judging that a large leakage fault exists;
if so, closing the carbon tank electromagnetic valve, calculating the leakage area after the vehicle is stationary, judging whether the leakage area is smaller than a set area threshold, if not, entering an integral mode diagnosis for leakage diagnosis, and if so, judging that no leakage exists.
According to the leakage monitoring method of the fuel evaporation system of the high-pressure oil tank, when the actual pressure of the oil tank is higher than a set pressure threshold value, the oil tank isolation valve is kept closed, the oil tank isolation valve is used as a boundary, the partition mode diagnosis is used, and when the actual pressure of the oil tank is lower than the set pressure threshold value, the oil tank isolation valve is opened, and the integral mode diagnosis is used. The problem of current high pressure fuel tank fuel evaporation system leak monitoring need multiple pressure release, exist inconvenient and emission pollution is solved, evaporation emission risk can be reduced, leak monitoring's convenience and security are improved.
While the construction, features and effects of the present invention have been described in detail with reference to the embodiments shown in the drawings, the above description is only a preferred embodiment of the present invention, but the present invention is not limited to the embodiments shown in the drawings, and all changes made according to the concepts of the present invention or modifications as equivalent embodiments are within the scope of the present invention without departing from the spirit covered by the specification and drawings.
Claims (6)
1. A method for monitoring leakage of a fuel evaporation system of a high-pressure fuel tank, comprising the steps of:
an oil tank isolation valve is arranged between the carbon tank and the high-pressure oil tank, and an oil tank pressure sensor is arranged in the high-pressure oil tank so as to detect the pressure in the high-pressure oil tank;
a connecting pipeline between the carbon tank and the engine is provided with a carbon tank electromagnetic valve and a vacuum degree pressure sensor;
in the leakage detection process, when the actual pressure of the oil tank is higher than a set pressure threshold value, keeping the oil tank isolation valve closed, and using the oil tank isolation valve as a boundary to diagnose whether the fuel evaporation system has leakage or not by using a partition mode;
and when the actual pressure of the fuel tank is lower than the set pressure threshold value, opening the fuel tank isolation valve, and diagnosing whether the fuel evaporation system has leakage or not by using the integral mode.
2. The method for monitoring leakage of a fuel evaporation system for a high pressure fuel tank according to claim 1, further comprising:
when the partition mode diagnosis is carried out, judging whether leakage exists in a high-pressure area or not through detecting the pressure change of the high-pressure oil tank by an oil tank pressure sensor;
and after the engine is used for vacuumizing the low-pressure area, judging whether leakage exists in the low-pressure area or not according to the vacuum degree change detected by the vacuum degree pressure sensor.
3. The method of claim 2, wherein the overall mode diagnostic process comprises:
closing the oil tank isolation valve, acquiring an oil tank pressure sensor signal after the diagnosis condition is met, opening the oil tank isolation valve if the pressure is smaller than a set pressure threshold value, and entering an integral diagnosis mode;
after the oil tank isolation valve is opened, the carbon tank is continuously flushed until the load is lower than a set load threshold value, then a carbon tank ventilation valve arranged on an exhaust pipe of the carbon tank is closed, a carbon tank electromagnetic valve is opened for vacuumizing, when the vacuum degree is lower than the set vacuum degree threshold value after the set time, a large leakage fault is reported, diagnosis is finished, and after the vacuum degree is higher than the set vacuum degree threshold value, the carbon tank electromagnetic valve is closed;
and acquiring a vacuum degree signal measured by a vacuum degree pressure sensor, recording a vacuum degree-time curve after the vehicle is stopped, and judging that the fuel evaporation system is free of leakage when the pressure change rate of the calculated vacuum degree is smaller than a calibrated diagnosis pressure threshold value.
4. A method of monitoring leakage in a fuel vapor system of a high pressure tank according to claim 3, wherein said using a global pattern to diagnose whether a leak exists in the fuel vapor system comprises;
after the oil tank isolation valve is opened, acquiring the load of the carbon tank, judging whether the load of the carbon tank is lower than a set load threshold, and if not, continuing flushing the carbon tank;
if so, closing a carbon tank ventilation valve arranged on the carbon tank exhaust pipe, opening a carbon tank electromagnetic valve, and vacuumizing the carbon tank by operating an engine;
judging whether the vacuum degree is larger than a set vacuum degree threshold value, if not, judging that a large leakage fault exists;
if so, closing the carbon tank electromagnetic valve, judging whether the pressure change rate of the vacuum degree is smaller than a diagnosis pressure threshold value, if not, judging that the leakage is more than 1mm, and if so, judging that the leakage is not caused.
5. The method for monitoring leakage of fuel vapor system in high pressure fuel tank according to claim 4, wherein said zone mode diagnostic process comprises:
closing an oil tank isolation valve, acquiring an oil tank pressure sensor signal, if the pressure is greater than a set pressure threshold value, keeping the oil tank isolation valve closed, and entering a partition independent diagnosis mode;
acquiring the pressure of the oil tank, recording the pressure-time change curve of the oil tank after the vehicle is stationary, calculating the leakage area according to the small hole leakage model, and judging that no leakage exists when the leakage area is smaller than the set area threshold value;
closing a carbon tank ventilation valve arranged on a carbon tank exhaust pipe, opening a carbon tank electromagnetic valve to vacuumize, wherein the vacuum degree is smaller than a set vacuum degree threshold value, reporting a large leakage fault, and closing the carbon tank electromagnetic valve after diagnosis is finished and the vacuum degree is larger than the set vacuum degree threshold value;
and acquiring a vacuum degree signal measured by a vacuum degree pressure sensor, recording a vacuum degree-time curve after the vehicle is stopped, calculating the leakage area according to the small hole leakage model, and judging that no leakage exists when the leakage area is smaller than a set area threshold value.
6. The method for monitoring leakage of fuel evaporation system for high pressure fuel tank according to claim 5, wherein said diagnosing whether there is leakage in fuel evaporation system using zone mode comprises:
after the oil tank isolation valve is closed, acquiring the load of the carbon tank, judging whether the load of the carbon tank is lower than a set load threshold, and if not, continuing flushing the carbon tank;
if so, acquiring the pressure of the oil tank, calculating the leakage area after the vehicle is stationary, and judging whether the leakage area is smaller than a set area threshold value;
if not, entering a whole mode diagnosis to carry out leakage diagnosis;
if yes, acquiring the load of the carbon tank again, judging whether the load of the carbon tank is lower than a set load threshold, and if not, continuing flushing the carbon tank;
if the air inlet valve is closed, a carbon tank ventilation valve arranged on the carbon tank exhaust pipe is closed, a carbon tank electromagnetic valve is opened, and the carbon tank is vacuumized by operating an engine;
judging whether the vacuum degree is larger than a set vacuum degree threshold value, if not, judging that a large leakage fault exists;
if so, closing the carbon tank electromagnetic valve, calculating the leakage area after the vehicle is stationary, judging whether the leakage area is smaller than a set area threshold, if not, entering an integral mode diagnosis for leakage diagnosis, and if so, judging that no leakage exists.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311051640.0A CN116906203A (en) | 2023-08-18 | 2023-08-18 | Leakage monitoring method for fuel evaporation system of high-pressure oil tank |
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| CN202311051640.0A CN116906203A (en) | 2023-08-18 | 2023-08-18 | Leakage monitoring method for fuel evaporation system of high-pressure oil tank |
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| CN117948219A (en) * | 2024-01-31 | 2024-04-30 | 重庆长安汽车股份有限公司 | Leakage detection method, device, equipment, vehicle and storage medium of evaporation system |
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