CN110671222A - Fuel leakage diagnosis method, device and computer readable storage medium - Google Patents
Fuel leakage diagnosis method, device and computer readable storage medium Download PDFInfo
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- CN110671222A CN110671222A CN201911057764.3A CN201911057764A CN110671222A CN 110671222 A CN110671222 A CN 110671222A CN 201911057764 A CN201911057764 A CN 201911057764A CN 110671222 A CN110671222 A CN 110671222A
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- 238000003745 diagnosis Methods 0.000 title claims abstract description 209
- 239000000446 fuel Substances 0.000 title claims abstract description 118
- 238000000034 method Methods 0.000 title claims abstract description 52
- 238000012544 monitoring process Methods 0.000 claims abstract description 26
- 239000003921 oil Substances 0.000 claims description 94
- 230000007613 environmental effect Effects 0.000 claims description 20
- 239000002828 fuel tank Substances 0.000 claims description 20
- 238000005086 pumping Methods 0.000 claims description 17
- 230000002401 inhibitory effect Effects 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 9
- 229910052799 carbon Inorganic materials 0.000 claims description 7
- 239000000295 fuel oil Substances 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 5
- 238000002405 diagnostic procedure Methods 0.000 claims description 3
- 230000003213 activating effect Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 4
- 238000001514 detection method Methods 0.000 description 15
- 230000008020 evaporation Effects 0.000 description 7
- 238000001704 evaporation Methods 0.000 description 7
- 238000004891 communication Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 239000002737 fuel gas Substances 0.000 description 2
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
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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
- 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)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention discloses a fuel leakage diagnosis method, which comprises the following steps: after the vehicle reaches the preset time in the post-operation stage, monitoring the state information of the vehicle through the engine control unit ECU, and judging whether the current vehicle meets the preset diagnosis enabling condition or not according to the state information; if the current vehicle meets the preset diagnosis enabling conditions, controlling the electromagnetic valve to be opened through an Engine Control Unit (ECU), and starting the air pump to pump the oil tank system; and acquiring a pressure change value in the oil tank system, and determining whether the oil tank system has leakage according to the pressure change value. The invention also discloses a fuel leakage diagnosis device and a computer readable storage medium. The method can execute the fuel leakage diagnosis without the need of the engine to operate for a period of time to produce a natural vacuum effect or having strict requirements on the idling working condition of the engine, and simultaneously ensures higher diagnosis robustness and actual diagnosis rate.
Description
Technical Field
The invention relates to the technical field of automobile control, in particular to a fuel leakage diagnosis method and device and a computer readable storage medium.
Background
In the face of increasingly severe environmental pressure, in order to reduce the pollution of fuel vapor as much as possible, GB18352-2016, "light vehicle pollutant emission limit and measurement method (sixth phase of china)" (hereinafter, referred to as "national six regulations") makes more strict restrictions on fuel evaporation, and at the same time introduces requirements on leakage diagnosis of a fuel evaporation system, which requires on-board diagnosis to accurately detect fuel leakage of a fuel evaporation system of 1mm or more, which is a great challenge for enterprises producing national six cars.
The current industry diagnosis scheme for the leakage of the vehicle fuel system mainly comprises diagnosis schemes such as EONV and DTESK. The working principle of the EONV scheme is that through the rising-falling process of the temperature of the oil tank before and after the operation of an engine, the oil gas pressure in the oil tank in a closed state can be increased along with the rising of the temperature and reduced along with the falling of the temperature, the change amplitude has a direct relation with the leakage size of the oil gas pressure, and whether the equivalent leakage area of the current evaporation system reaches the fault standard or not can be judged based on the principle. The working principle of the DTESK scheme is that when an engine is communicated with vacuum areas such as an air inlet manifold and the like through a carbon tank flushing valve under an idling working condition, an evaporation system generates an underpressure, the actual leakage size of the evaporation system is judged by observing the underpressure recovery capacity of the evaporation system in a closed environment, the scheme requires that a carbon tank closing valve is additionally arranged at an air inlet of the carbon tank, and the condition that the valve is closed to manufacture closed vacuum when necessary is ensured. Therefore, the above-mentioned solutions, which require the engine to run for a certain period of time to create the natural vacuum effect, have strict requirements on the idle condition of the engine, and both of the above-mentioned solutions are challenging when used in a hybrid vehicle, resulting in the problems of poor applicability, low diagnostic robustness and low actual diagnostic rate (IUPR) of the above-mentioned solutions.
Disclosure of Invention
The invention mainly aims to provide a fuel leakage diagnosis method, a fuel leakage diagnosis device and a computer readable storage medium, and aims to solve the technical problems of poor applicability, low diagnosis robustness and low diagnosis rate of the existing fuel leakage diagnosis scheme.
In order to achieve the above object, the present invention provides a fuel leakage diagnosis method, which is applied to a fuel diagnosis system, the fuel diagnosis system includes a fuel tank system, a fuel leakage diagnosis device, and an engine control unit ECU, the fuel leakage diagnosis device includes an electromagnetic valve and an air pump, the electromagnetic valve and the air pump are respectively electrically connected to the engine control unit ECU, the air pump, the electromagnetic valve, and the fuel tank system are sequentially connected by a pipeline, the fuel leakage diagnosis method includes:
monitoring the state information of the vehicle through the ECU after the vehicle reaches the preset time in the post-operation stage;
judging whether the current vehicle meets a preset diagnosis enabling condition or not according to the state information;
if the current vehicle meets the preset diagnosis enabling conditions, controlling the electromagnetic valve to be opened through an Engine Control Unit (ECU), and starting the air pump to pump the oil tank system;
and acquiring a pressure change value in the oil tank system, and determining whether the oil tank system has leakage according to the pressure change value.
Preferably, the step of acquiring a pressure variation value in the tank system and determining whether there is a leak in the tank system according to the pressure variation value includes:
obtaining a plurality of continuous pump currents of the air pump through the engine control unit ECU, and converting the plurality of continuous pump currents into a plurality of corresponding pressure values;
acquiring a pressure change value in the oil tank system in the pumping process according to the plurality of pressure values;
and comparing the pressure change value with a reference pressure change value, and determining whether the oil tank system has leakage according to the comparison result.
Preferably, the step of comparing the pressure variation value with a reference pressure variation value and determining whether there is a leak in the tank system according to the comparison result includes:
comparing the pressure change value with a reference pressure change value;
if the pressure change value is larger than or equal to the reference pressure change value, the oil tank system has no leakage;
and if the pressure change value is smaller than the reference pressure change value, the oil tank system has leakage.
Preferably, the fuel leakage diagnosis device further includes a standard leakage hole, and before the step of controlling the electromagnetic valve to open through an engine control unit ECU and starting the air pump to pump the oil tank system, the standard leakage hole includes:
the electromagnetic valve is controlled to be closed through an engine control unit ECU, and the air pump is started to pump air to the standard leakage hole;
acquiring a plurality of continuous pump currents of the air pump, converting the plurality of continuous pump currents into a plurality of corresponding reference pressure values, and acquiring a reference pressure change value of the fuel oil leakage diagnosis device according to the plurality of reference pressure values;
judging whether the diagnosis time meets a preset threshold value or not;
if the diagnosis time meets a preset threshold, executing the following steps: and the electromagnetic valve is controlled to be opened through an engine control unit ECU, and the air pump is started to pump the oil tank system.
Preferably, the preset diagnosis enabling conditions include a diagnosis leakage basic condition, a leakage diagnosis environmental condition, a lighting condition, a diagnosis leakage operation condition, and an engine operation state.
Preferably, when the preset diagnosis enabling condition is a basic diagnosis leakage condition, the step of monitoring the state information of the vehicle by the engine control unit ECU and judging whether the current vehicle meets the preset diagnosis enabling condition according to the state information includes:
monitoring, by the engine control unit ECU, status flag bit information of a power status, a leak diagnosis output status, a safety status, an oil level status, a leak request transmission status, and/or an atmospheric pressure status of a vehicle;
and determining whether the current vehicle meets the basic condition of leakage diagnosis according to the state identification bit information.
Preferably, when the preset diagnosis enabling condition is a leakage diagnosis environment condition, the step of monitoring, by the engine control unit ECU, state information of the vehicle, and determining whether the current vehicle satisfies the preset diagnosis enabling condition according to the state information includes:
monitoring the state identification position information of the altitude of a vehicle, the water temperature and/or the environment temperature when an engine is started for the first time through the ECU;
and determining whether the current vehicle meets the leakage diagnosis environmental condition or not according to the state identification bit information.
Preferably, the fuel leakage diagnosis method further includes:
and when the engine control unit ECU monitors a preset diagnosis inhibiting condition, closing the air pump, wherein the preset diagnosis inhibiting condition comprises a leakage diagnosis stop request or a high-load state of a carbon tank.
Further, to achieve the above object, the present invention also provides a fuel leakage diagnosis apparatus including: a solenoid valve, an air pump, a memory, a processor, and a fuel leak diagnostic program stored on the memory and operable on the processor, wherein,
the electromagnetic valve and the air pump are respectively and electrically connected with the engine control unit ECU, and the air pump, the electromagnetic valve and the oil tank system are sequentially connected through pipelines;
the fuel leak diagnosis program implements the steps of the fuel leak diagnosis method according to any one of the above when executed by the processor.
Further, to achieve the above object, the present invention provides a computer-readable storage medium having stored thereon a fuel leakage diagnosis program, which when executed by a processor, implements the steps of the fuel leakage diagnosis method as recited in any one of the above.
After the vehicle reaches the preset time in the post-operation stage, monitoring the state information of the vehicle through the ECU, and judging whether the current vehicle meets the preset diagnosis enabling condition or not according to the state information; if the current vehicle meets the preset diagnosis enabling conditions, controlling the electromagnetic valve to be opened through an Engine Control Unit (ECU), and starting the air pump to pump the oil tank system; and acquiring a pressure change value in the oil tank system, and determining whether the oil tank system has leakage according to the pressure change value. Through the implementation mode, after the current vehicle is determined to meet the preset diagnosis enabling condition, the oil tank system is pumped to generate positive pressure, and whether the oil tank system leaks is determined by comparing the pressure change value with the reference pressure change value, so that fuel leakage diagnosis can be executed without the need of an engine to run for a period of time to produce a natural vacuum effect or having a strict requirement on the idling working condition of the engine, and meanwhile, the diagnosis result is ensured to have higher diagnosis robustness and actual diagnosis rate.
Drawings
Fig. 1 is a schematic structural view of an embodiment of a fuel leakage diagnosis apparatus of the present invention;
FIG. 2 is a schematic flow chart diagram of a first embodiment of the fuel leak diagnostic method of the present invention;
FIG. 3 is a schematic flow chart diagram of a second embodiment of the fuel leak diagnosis method of the present invention;
fig. 4 is a flowchart illustrating a fuel leakage diagnosing method according to a third embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The fuel leakage diagnosis device comprises an electromagnetic valve and an air pump, wherein the electromagnetic valve is electrically connected with the engine control unit ECU and used for controlling the on-off state of the electromagnetic valve through the engine control unit ECU, the air pump is electrically connected with the engine control unit ECU and used for acquiring the pump current of the air pump, and the air pump, the electromagnetic valve and the fuel tank system are sequentially connected through pipelines and used for pumping air to the fuel tank system through the air pump. When a vehicle needs to detect fuel leakage of an oil tank system, an engine control unit ECU controls the opening of an electromagnetic valve in the fuel leakage diagnosis device, after the electromagnetic valve is opened, an air pump starts to pump the oil tank system, if the oil tank system is a closed space and a leakage opening does not exist, the pressure in the oil tank system rises rapidly, and the pump current rises synchronously along with the pressure; if the oil tank system has a leakage opening, the oil tank pressure does not rise or changes slightly when the air pump pumps air, and the pump current slowly rises or does not rise at the moment.
Optionally, the fuel leakage diagnosing apparatus further includes a standard leakage hole for self-checking of the pressure value of the fuel leakage diagnosing apparatus. The reference pressure variation value of the fuel leakage diagnosing apparatus may be obtained in advance before the fuel leakage detection of the fuel tank system. At the moment, the air pump is opened to pump the standard leakage hole in the fuel leakage diagnosis device, when the pressure value reaches the preset pressure value, the air pump is stopped, the electromagnetic valve in the fuel leakage diagnosis device is closed, and the pressure change value when the standard leakage hole exists is detected, namely the reference pressure change value.
It should be noted that the electromagnetic valve in the present invention is an electromagnetic valve in the fuel leakage diagnostic apparatus, and is used for controlling the air flow direction of the air pump in the fuel leakage diagnostic apparatus, rather than a canister control valve on the whole vehicle, and the canister control valve on the whole vehicle is used for controlling the flow rate of the regeneration air flow, introducing the fuel vapor into the intake manifold, and realizing the regeneration of the activated carbon by using the air flow.
As shown in fig. 1, fig. 1 is a schematic structural diagram of an embodiment of a fuel leakage diagnosis device of the present invention.
As shown in fig. 1, the fuel leakage diagnosis apparatus may include: a processor 1001, such as a CPU, a communication bus 1002, a solenoid valve 1003, an air pump 1004, and a memory 1005. Wherein a communication bus 1002 is used to enable connective communication between these components. The memory 1005 may be a high-speed RAM memory or a non-volatile memory (e.g., a magnetic disk memory). The memory 1005 may alternatively be a storage device separate from the processor 1001.
Those skilled in the art will appreciate that the configuration of the device shown in fig. 1 is not intended to be limiting of the device and may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components.
As shown in fig. 1, a memory 1005, which is a kind of computer storage medium, may include therein a vehicle control system and a fuel leakage diagnosis program. The processor 1001 may be configured to invoke a fuel leak diagnostic program stored in the memory 1005 and perform the following operations:
monitoring the state information of the vehicle through the ECU after the vehicle reaches the preset time in the post-operation stage;
judging whether the current vehicle meets a preset diagnosis enabling condition or not according to the state information;
if the current vehicle meets the preset diagnosis enabling conditions, controlling the electromagnetic valve to be opened through an Engine Control Unit (ECU), and starting the air pump to pump the oil tank system;
and acquiring a pressure change value in the oil tank system, and determining whether the oil tank system has leakage according to the pressure change value.
Further, the processor 1001 may call the fuel leakage diagnosis program stored in the memory 1005, and also perform the following operations:
obtaining a plurality of continuous pump currents of the air pump through the engine control unit ECU, and converting the plurality of continuous pump currents into a plurality of corresponding pressure values;
acquiring a pressure change value in the oil tank system in the pumping process according to the plurality of pressure values;
and comparing the pressure change value with a reference pressure change value, and determining whether the oil tank system has leakage according to the comparison result.
Further, the processor 1001 may call the fuel leakage diagnosis program stored in the memory 1005, and also perform the following operations:
comparing the pressure change value with a reference pressure change value;
if the pressure change value is larger than or equal to the reference pressure change value, the oil tank system has no leakage;
and if the pressure change value is smaller than the reference pressure change value, the oil tank system has leakage.
Further, the processor 1001 may call the fuel leakage diagnosis program stored in the memory 1005, and also perform the following operations:
the electromagnetic valve is controlled to be closed through an engine control unit ECU, and the air pump is started to pump air to the standard leakage hole;
acquiring a plurality of continuous pump currents of the air pump, converting the plurality of continuous pump currents into a plurality of corresponding reference pressure values, and acquiring a reference pressure change value of the fuel oil leakage diagnosis device according to the plurality of reference pressure values;
judging whether the diagnosis time meets a preset threshold value or not;
if the diagnosis time meets a preset threshold, executing the following steps: and the electromagnetic valve is controlled to be opened through an engine control unit ECU, and the air pump is started to pump the oil tank system.
Further, the processor 1001 may call the fuel leakage diagnosis program stored in the memory 1005, and also perform the following operations:
the preset diagnosis enabling conditions include a diagnosis leakage basic condition, a leakage diagnosis environmental condition, a lighting condition, a diagnosis leakage operation condition, and an engine operation state.
Further, the processor 1001 may call the fuel leakage diagnosis program stored in the memory 1005, and also perform the following operations:
monitoring, by the engine control unit ECU, status flag bit information of a power status, a leak diagnosis output status, a safety status, an oil level status, a leak request transmission status, and/or an atmospheric pressure status of a vehicle;
and determining whether the current vehicle meets the basic condition of leakage diagnosis according to the state identification bit information.
Further, the processor 1001 may call the fuel leakage diagnosis program stored in the memory 1005, and also perform the following operations:
monitoring the state identification position information of the altitude of a vehicle, the water temperature and/or the environment temperature when an engine is started for the first time through the ECU;
and determining whether the current vehicle meets the leakage diagnosis environmental condition or not according to the state identification bit information.
Further, the processor 1001 may call the fuel leakage diagnosis program stored in the memory 1005, and also perform the following operations:
and when the engine control unit ECU monitors a preset diagnosis inhibiting condition, closing the air pump, wherein the preset diagnosis inhibiting condition comprises a leakage diagnosis stop request or a high-load state of a carbon tank.
The specific embodiment of the fuel leakage diagnosis device of the present invention is basically the same as the following embodiments of the fuel leakage diagnosis method, and will not be described herein again.
Referring to fig. 2, fig. 2 is a schematic flow chart of a first embodiment of a fuel leakage diagnosis method of the present invention, which includes:
and step S10, monitoring the state information of the vehicle through the engine control unit ECU after the vehicle is in the post-operation stage for a preset time.
When the vehicle enters a post-operation stage and reaches a preset time in the post-operation stage, monitoring the state information of the vehicle through an Engine Control Unit (ECU) of the vehicle. Specifically, the rear running phase of the vehicle here is a vehicle power-off flameout phase. The preset time can be specifically set according to actual conditions, for example, 2 hours, 3 hours, etc., and the embodiment of the present invention is preferably 440 s. That is, after the vehicle is electrically turned off for a preset time, the state information of the vehicle is acquired by the engine control unit ECU, wherein the state information includes the vehicle own state information, the environmental state information and the like, such as the engine running time, the oil level, the environmental temperature, the atmospheric pressure, the refueling request, the component failure and the like.
And step S20, judging whether the current vehicle meets the preset diagnosis enabling condition according to the state information.
And after the engine control unit ECU acquires the state information, judging whether the current vehicle meets a preset diagnosis enabling condition according to the acquired state information. The preset diagnosis enabling condition may include a diagnosis leak basic condition, a leak diagnosis environmental condition, a lighting condition, a diagnosis leak operation condition, an engine operation state, and the like. The diagnosis enabling condition is preset by a user and can be adjusted according to actual requirements, and comprises setting of conditions related to vehicle fuel leakage detection and setting of a value range when the diagnosis conditions are met, and if the vehicle fuel leakage detection needs to meet the conditions that the current vehicle oil pressure is 15% -85%, the current environment temperature is 4 ℃ -35 ℃, the current altitude is 2440 m or less, namely the current atmospheric pressure is 72kpa or more, when the conditions are all in an allowable range, the current vehicle can be judged to meet the preset diagnosis enabling condition, and the fuel leakage detection can be carried out; when any one of the conditions is not in the allowable range, the current vehicle can be judged not to meet the preset diagnosis enabling condition, and the judgment and the determination need to be carried out after the next later operation stage. Therefore, if the current vehicle satisfies the preset diagnosis enabling condition, step S30 is executed; and if the current vehicle does not meet the preset diagnosis enabling conditions, waiting for the next post-operation stage and then judging and determining.
And step S30, controlling the electromagnetic valve to be opened through an engine control unit ECU, and starting the air pump to pump the oil tank system.
When the current vehicle meets the preset diagnosis enabling condition, fuel leakage detection is started to be carried out on the oil tank system, at the moment, control instructions are respectively sent to the electromagnetic valve and the air pump through the ECU so as to control the electromagnetic valve to be opened, and meanwhile, the air pump is controlled to be started to start pumping the oil tank system.
And step S40, acquiring a pressure change value in the oil tank system, and determining whether the oil tank system has leakage according to the pressure change value.
In the process of pumping the air by the air pump, the value of the pump current is obtained from a driving circuit in the air pump, and the pressure value of the oil tank system can be calculated through the obtained value of the pump current because the pump current has a positive correlation with the pressure value in the oil tank system, so that the pressure change values at different moments in the process of pumping the air can be obtained, and whether the oil tank system leaks or not can be determined according to the change trend of the pressure change values. For example, as the air pump starts pumping air, the pressure of the oil tank system rises rapidly, and when a certain preset pressure value is reached, the air pump stops pumping air, and the pressure of the oil tank system remains unchanged, which indicates that there is no leakage in the oil tank system. If the pressure of the oil tank system drops after the air pump stops pumping, the oil tank system is indicated to have leakage.
In the embodiment, when the vehicle is in the post-operation stage for the preset time and meets the preset diagnosis enabling condition, the engine control unit ECU starts the air pump to pump air to the oil tank system, so that the oil tank system generates positive pressure, the fuel leakage diagnosis can be executed without the need of the engine operating for a period of time to produce a natural vacuum effect or having a strict requirement on the idling condition of the engine, and meanwhile, higher diagnosis robustness and actual diagnosis rate are ensured.
Further, referring to fig. 3, fig. 3 is a schematic flow chart of a second embodiment of the fuel leakage diagnosis method of the present invention, and based on the embodiment shown in fig. 2, the step of acquiring a pressure variation value in the fuel tank system and determining whether there is a leakage in the fuel tank system according to the pressure variation value includes:
step S401, obtaining, by the ECU, a plurality of continuous pump currents of the air pump, and converting the plurality of continuous pump currents into a plurality of corresponding pressure values.
Since the pump current in the air pump will increase as the pressure in the oil tank system increases during the pumping process of the air pump, the pressure in the oil tank system can be calculated by the pump current on the driving circuit. Therefore, in the air pumping process, the engine control unit ECU acquires a plurality of continuous pump currents of the air pump and converts the plurality of continuous pump currents into a plurality of corresponding pressure values.
And step S402, acquiring a pressure change value in the oil tank system in the pumping process according to the plurality of pressure values.
And S403, comparing the pressure change value with a reference pressure change value, and determining whether the oil tank system has leakage according to the comparison result.
And acquiring the pressure values corresponding to different moments in real time to acquire the pressure change values of the oil tank system at different moments in the pumping process. After the pressure change value is obtained, comparing the obtained pressure change value with a reference pressure change value; if the pressure change value is larger than or equal to the reference pressure change value, the oil tank system is not leaked; if the pressure change value is smaller than the reference pressure change value, the leakage of the oil tank system is indicated.
As another embodiment, since the pump current has a positive correlation with the pressure value of the oil tank system, the continuous pump currents of the air pump acquired by the engine control unit ECU and the continuous reference pump currents of the air pump acquired by the engine control unit ECU may be directly compared, and the pressure values of the two may be directly compared according to the variation value of the pump current and the variation value of the reference pump current.
In the embodiment, the change of the pressure value in the fuel tank system is judged according to the change of the pump current of the air pump, and whether the fuel tank system has leakage or not is judged by comparing the pressure change value with the reference pressure change value, so that the accurate diagnosis of the fuel leakage is realized.
Further, referring to fig. 4, fig. 4 is a schematic flow chart of a third embodiment of the fuel leakage diagnosis method of the present invention, based on the embodiment shown in fig. 2, the fuel leakage diagnosis device further includes a standard leakage hole, and before the step of controlling the electromagnetic valve to open by the ECU and starting the air pump to pump the oil tank system, the method includes:
and step S201, controlling the electromagnetic valve to be closed through an engine control unit ECU, and starting the air pump to pump air to the standard leakage hole.
When the vehicle is in the post-operation stage for a preset time and meets the preset diagnosis enabling conditions, and before the fuel leakage detection is performed on the fuel tank system, a reference pressure change value of the fuel leakage diagnosis device needs to be obtained. Because the fuel leakage diagnosis device also comprises the standard leakage hole, when the fuel leakage diagnosis device carries out pressure value self-checking, the electromagnetic valve can be controlled to be closed through the ECU of the engine control unit, so that a closed space is formed in the fuel leakage diagnosis device, the air pump is started to pump air to the standard leakage hole in the closed space, and therefore the pump current in the air pump in the self-checking process is obtained.
Step S202, obtaining a plurality of continuous pump currents of the air pump, converting the plurality of continuous pump currents into a plurality of corresponding reference pressure values, and obtaining a reference pressure change value of the fuel leakage diagnosis device according to the plurality of reference pressure values.
Because the standard leakage hole is preset in the fuel gas leakage detection device, such as the leakage hole with the size of 0.5mm, a plurality of continuous pump currents of the air pump when the standard leakage hole exists can be detected, and the plurality of continuous pump currents are converted into a plurality of corresponding reference pressure values, so that the reference pressure change value of the fuel gas leakage diagnosis device is obtained according to the plurality of reference pressure values. And when the pressure value in the closed space reaches a preset pressure value, stopping pumping the air and closing the electromagnetic valve. This facilitates the comparison of the acquired pressure variation value with the reference pressure variation value after the pressure variation value is acquired; if the pressure change value is greater than or equal to the reference pressure change value, the leakage port of the oil tank system is less than or equal to the standard leakage port, and the oil tank system is considered to have no leakage; if the pressure change value is smaller than the reference pressure change value, the leakage port of the oil tank system is larger than the standard leakage port, and the oil tank system can be considered to have leakage.
Step S203, determining whether the diagnosis time satisfies a preset threshold.
If the diagnosis time meets the preset threshold, executing step S30: and the electromagnetic valve is controlled to be opened through an engine control unit ECU, and the air pump is started to pump the oil tank system. And if the diagnosis time does not meet the preset threshold value, continuously acquiring the reference pressure change value of the fuel leakage diagnosis device until the diagnosis time reaches the preset duration. The preset time period here can be specifically set according to actual situations, such as 50s, 60s, 70s, and the like, and the embodiment is not particularly limited. Of course, as another embodiment, the pressure value in the fuel tank system may be determined by combining the diagnostic time and the pressure value in the fuel tank system, the pressure value in the fuel tank system is in an ascending state along with the pumping process, and the pressure value is kept constant after the pressure value in the fuel tank system is ascended to a certain extent, so that the time for maintaining the pressure value in the fuel tank system to be constant may be obtained, and when the time reaches the preset time, the self-check of the fuel leakage detection apparatus may be considered to be completed. The preset time duration here may be specifically set according to actual situations, such as 10s, 20s, and the like, and the embodiment is not particularly limited.
In the embodiment, the reference pressure change value of the oil tank system is obtained by inflating the gas leakage detection device, so that a standard reference amount can exist in subsequent actual detection, and the detection accuracy is improved.
Further, based on the embodiment shown in fig. 2 described above, the preset diagnosis enabling conditions include a diagnosis leak basic condition, a leak diagnosis environment condition, a lighting condition, a diagnosis leak operation condition, and an engine operating state. When the preset diagnosis enabling condition is a basic diagnosis leakage condition, the step of monitoring the state information of the vehicle through the engine control unit ECU and judging whether the current vehicle meets the preset diagnosis enabling condition according to the state information comprises the following steps:
step S101, monitoring the state identification bit information of the power supply state, the leakage diagnosis output state, the safety state, the oil level state, the leakage request sending state and/or the atmospheric pressure state of the vehicle through the engine control unit ECU.
And step S102, determining whether the current vehicle meets the basic condition of leakage diagnosis according to the state identification bit information.
In order to ensure the accuracy of detection and the safety of a vehicle body, the power supply state, the leakage diagnosis output state, the safety state, the oil level state, the leakage request transmission state and the atmospheric pressure state are preferably used as conditions for judging whether the basic leakage condition is satisfied.
When the vehicle reaches the preset time in the post-operation stage, monitoring the state identification bit information of the power supply state, the leakage diagnosis output state, the safety state, the oil level state, the leakage request sending state and the atmospheric pressure state of the vehicle respectively through an engine control unit ECU, wherein when the state identification bit of the power supply state is true, the current power supply electric quantity is in accordance with the power supply electric quantity range of fuel leakage diagnosis; when the state identification bit of the leakage diagnosis output state is true, indicating that the leakage diagnosis output exists currently; when the state identification bit of the safety state is true, the fuel oil detection system shows that no component fails; when the state identification bit of the oil level state is true, the current oil level is in accordance with the oil level range of the fuel leakage diagnosis; when the state identification bit of the leakage request sending state is true, indicating that the leakage request exists currently; and when the state identification bit of the atmospheric pressure state is true, indicating that the current atmospheric pressure accords with the atmospheric pressure range of the fuel leakage diagnosis. If the conditions are all met, the current vehicle meets the basic condition for diagnosing leakage; otherwise, the current vehicle does not meet the basic condition for diagnosing the leakage.
Further, when the preset diagnosis enabling condition is a leakage diagnosis environment condition, the step of monitoring the state information of the vehicle through the engine control unit ECU and judging whether the current vehicle meets the preset diagnosis enabling condition according to the state information includes:
and step S103, monitoring the state identification position information of the altitude of the vehicle, the water temperature and/or the environment temperature when the engine is started for the first time through the engine control unit ECU.
And step S104, determining whether the current vehicle meets the leakage diagnosis environmental condition or not according to the state identification bit information.
In order to ensure the detection accuracy and the vehicle body safety, the altitude of the vehicle, the water temperature of the engine when the engine is started for the first time and the environmental temperature are preferably used as the conditions for judging whether the leakage diagnosis environmental condition is met.
When the vehicle reaches a preset time in a post-operation stage, respectively monitoring the altitude of the vehicle, the water temperature when the engine is started for the first time, the ambient temperature and the state identification position information of the oil level through an engine control unit ECU, wherein when the state identification position of the altitude is true, the current altitude accords with the altitude range of fuel leakage diagnosis; when the state identification position of the water temperature when the engine is started for the first time is true, the water temperature when the current engine is started for the first time is in accordance with the water temperature range of fuel oil leakage diagnosis; and when the state identification bit of the ambient temperature is true, indicating that the current ambient temperature accords with the ambient temperature range of the fuel leakage diagnosis. If the conditions are all met, the current vehicle meets the leakage diagnosis environmental conditions; otherwise, the current vehicle is not satisfied with the leakage diagnosis environmental condition.
The preset diagnosis enabling conditions in the present embodiment include a diagnosis leak basic condition, a leak diagnosis environmental condition, a lighting condition, a diagnosis leak operation condition, and an engine operation state. When the diagnosis leakage basic condition, the leakage diagnosis environmental condition, the lighting condition, the diagnosis leakage operation condition and the engine operation state simultaneously satisfy the conditions, it is indicated that the vehicle can perform the fuel leakage diagnosis at present. Otherwise, the fuel leakage diagnosis of the current vehicle is not possible.
It should be noted that, in the process of diagnosing the oil tank system, when the engine control unit ECU monitors a preset diagnosis suppression condition, the air pump is turned off to stop the air pump, so that the diagnostic step being executed is stopped. Wherein the preset diagnosis inhibiting condition includes a leak diagnosis stop request or a canister high load state.
In the embodiment, the enabling condition and the inhibiting condition of the fuel leakage diagnosis are determined, so that the vehicle can execute the fuel leakage diagnosis only under the condition that the enabling condition is met, and the fuel leakage diagnosis is stopped under the condition that the inhibiting condition is generated, thereby ensuring the detection effectiveness.
Furthermore, an embodiment of the present invention further provides a computer-readable storage medium, where a fuel leakage diagnosis program is stored on the computer-readable storage medium, and when executed by a processor, the fuel leakage diagnosis program implements the following operations:
monitoring the state information of the vehicle through the ECU after the vehicle reaches the preset time in the post-operation stage;
judging whether the current vehicle meets a preset diagnosis enabling condition or not according to the state information;
if the current vehicle meets the preset diagnosis enabling conditions, controlling the electromagnetic valve to be opened through an Engine Control Unit (ECU), and starting the air pump to pump the oil tank system;
and acquiring a pressure change value in the oil tank system, and determining whether the oil tank system has leakage according to the pressure change value.
Further, the fuel leakage diagnostic program when executed by the processor further performs the following operations:
obtaining a plurality of continuous pump currents of the air pump through the engine control unit ECU, and converting the plurality of continuous pump currents into a plurality of corresponding pressure values;
acquiring a pressure change value in the oil tank system in the pumping process according to the plurality of pressure values;
and comparing the pressure change value with a reference pressure change value, and determining whether the oil tank system has leakage according to the comparison result.
Further, the fuel leakage diagnostic program when executed by the processor further performs the following operations:
comparing the pressure change value with a reference pressure change value;
if the pressure change value is larger than or equal to the reference pressure change value, the oil tank system has no leakage;
and if the pressure change value is smaller than the reference pressure change value, the oil tank system has leakage.
Further, the fuel leakage diagnostic program when executed by the processor further performs the following operations:
the electromagnetic valve is controlled to be closed through an engine control unit ECU, and the air pump is started to pump air to the standard leakage hole;
acquiring a plurality of continuous pump currents of the air pump, converting the plurality of continuous pump currents into a plurality of corresponding reference pressure values, and acquiring a reference pressure change value of the fuel oil leakage diagnosis device according to the plurality of reference pressure values;
judging whether the diagnosis time meets a preset threshold value or not;
if the diagnosis time meets a preset threshold, executing the following steps: and the electromagnetic valve is controlled to be opened through an engine control unit ECU, and the air pump is started to pump the oil tank system.
Further, the fuel leakage diagnostic program when executed by the processor further performs the following operations:
the preset diagnosis enabling conditions include a diagnosis leakage basic condition, a leakage diagnosis environmental condition, a lighting condition, a diagnosis leakage operation condition, and an engine operation state.
Further, the fuel leakage diagnostic program when executed by the processor further performs the following operations:
monitoring, by the engine control unit ECU, status flag bit information of a power status, a leak diagnosis output status, a safety status, an oil level status, a leak request transmission status, and/or an atmospheric pressure status of a vehicle;
and determining whether the current vehicle meets the basic condition of leakage diagnosis according to the state identification bit information.
Further, the fuel leakage diagnostic program when executed by the processor further performs the following operations:
monitoring the state identification position information of the altitude of a vehicle, the water temperature and/or the environment temperature when an engine is started for the first time through the ECU;
and determining whether the current vehicle meets the leakage diagnosis environmental condition or not according to the state identification bit information.
Further, the fuel leakage diagnostic program when executed by the processor further performs the following operations:
and when the engine control unit ECU monitors a preset diagnosis inhibiting condition, closing the air pump, wherein the preset diagnosis inhibiting condition comprises a leakage diagnosis stop request or a high-load state of a carbon tank.
The specific embodiment of the computer-readable storage medium of the present invention is substantially the same as the embodiments of the fuel leakage diagnosis method described above, and will not be described herein again.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) as described above and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A fuel leakage diagnosis method is characterized by being applied to a fuel diagnosis system, the fuel diagnosis system comprises a fuel tank system, a fuel leakage diagnosis device and an engine control unit ECU, the fuel leakage diagnosis device comprises an electromagnetic valve and an air pump, the electromagnetic valve and the air pump are respectively and electrically connected with the engine control unit ECU, the air pump, the electromagnetic valve and the fuel tank system are sequentially connected through a pipeline, and the fuel leakage diagnosis method comprises the following steps:
monitoring the state information of the vehicle through the ECU after the vehicle reaches the preset time in the post-operation stage;
judging whether the current vehicle meets a preset diagnosis enabling condition or not according to the state information;
if the current vehicle meets the preset diagnosis enabling conditions, controlling the electromagnetic valve to be opened through an Engine Control Unit (ECU), and starting the air pump to pump the oil tank system;
and acquiring a pressure change value in the oil tank system, and determining whether the oil tank system has leakage according to the pressure change value.
2. The fuel leak diagnosis method according to claim 1, wherein the step of acquiring a pressure variation value in the fuel tank system and determining whether there is a leak in the fuel tank system based on the pressure variation value includes:
obtaining a plurality of continuous pump currents of the air pump through the engine control unit ECU, and converting the plurality of continuous pump currents into a plurality of corresponding pressure values;
acquiring a pressure change value in the oil tank system in the pumping process according to the plurality of pressure values;
and comparing the pressure change value with a reference pressure change value, and determining whether the oil tank system has leakage according to the comparison result.
3. The fuel leakage diagnostic method according to claim 2, wherein the step of comparing the pressure variation value with a reference pressure variation value and determining whether there is a leakage from the tank system based on the comparison result includes:
comparing the pressure change value with a reference pressure change value;
if the pressure change value is larger than or equal to the reference pressure change value, the oil tank system has no leakage;
and if the pressure change value is smaller than the reference pressure change value, the oil tank system has leakage.
4. The fuel leakage diagnosis method according to claim 1, wherein the fuel leakage diagnosis device further includes a standard leak hole, and before the step of controlling the solenoid valve to open and activating the air pump to pump the fuel tank system by the engine control unit ECU, the method includes:
the electromagnetic valve is controlled to be closed through an engine control unit ECU, and the air pump is started to pump air to the standard leakage hole;
acquiring a plurality of continuous pump currents of the air pump, converting the plurality of continuous pump currents into a plurality of corresponding reference pressure values, and acquiring a reference pressure change value of the fuel oil leakage diagnosis device according to the plurality of reference pressure values;
judging whether the diagnosis time meets a preset threshold value or not;
if the diagnosis time meets a preset threshold, executing the following steps: and the electromagnetic valve is controlled to be opened through an engine control unit ECU, and the air pump is started to pump the oil tank system.
5. The fuel leak diagnosis method according to claim 1, wherein the preset diagnosis enabling conditions include a diagnosis leak basic condition, a leak diagnosis environmental condition, a lighting condition, a diagnosis leak operation condition, and an engine operation state.
6. The fuel leakage diagnosis method according to claim 5, wherein the step of monitoring, by the engine control unit ECU, the state information of the vehicle when the preset diagnosis enabling condition is the diagnosis leakage base condition, and determining whether the current vehicle satisfies the preset diagnosis enabling condition based on the state information, comprises:
monitoring, by the engine control unit ECU, status flag bit information of a power status, a leak diagnosis output status, a safety status, an oil level status, a leak request transmission status, and/or an atmospheric pressure status of a vehicle;
and determining whether the current vehicle meets the basic condition of leakage diagnosis according to the state identification bit information.
7. The fuel leakage diagnosis method according to claim 5, wherein the step of monitoring, by the engine control unit ECU, the state information of the vehicle when the preset diagnosis enabling condition is the leakage diagnosis environmental condition, and determining whether the current vehicle satisfies the preset diagnosis enabling condition based on the state information, comprises:
monitoring the state identification position information of the altitude of a vehicle, the water temperature and/or the environment temperature when an engine is started for the first time through the ECU;
and determining whether the current vehicle meets the leakage diagnosis environmental condition or not according to the state identification bit information.
8. The fuel leak diagnosis method according to any one of claims 1 to 7, characterized by further comprising:
and when the engine control unit ECU monitors a preset diagnosis inhibiting condition, closing the air pump, wherein the preset diagnosis inhibiting condition comprises a leakage diagnosis stop request or a high-load state of a carbon tank.
9. A fuel leakage diagnostic apparatus characterized by comprising: a solenoid valve, an air pump, a memory, a processor, and a fuel leak diagnostic program stored on the memory and operable on the processor, wherein,
the electromagnetic valve and the air pump are respectively and electrically connected with the engine control unit ECU, and the air pump, the electromagnetic valve and the oil tank system are sequentially connected through pipelines;
the fuel leak diagnosis program, when executed by the processor, implements the steps of the fuel leak diagnosis method according to any one of claims 1 to 8.
10. A computer-readable storage medium having a fuel leakage diagnostic program stored thereon, wherein the fuel leakage diagnostic program, when executed by a processor, implements the steps of the fuel leakage diagnostic method according to any one of claims 1 to 8.
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| CN201911057764.3A CN110671222A (en) | 2019-10-31 | 2019-10-31 | Fuel leakage diagnosis method, device and computer readable storage medium |
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| CN201911057764.3A CN110671222A (en) | 2019-10-31 | 2019-10-31 | Fuel leakage diagnosis method, device and computer readable storage medium |
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