Carbon canister solenoid valve fault detection method, device, electronic device and storage medium

Abstract

An embodiment of the present invention discloses a method, device, equipment and storage medium for detecting a failure of a canister solenoid valve. The method includes: identifying whether the failure detection type of the canister solenoid valve is a first failure type according to the vehicle state information; if the failure detection type of the canister solenoid valve is the first failure type, determining the self-check current of the canister diagnostic assembly and the idle current of the canister diagnostic assembly; determining the diagnostic current of the canister diagnostic assembly according to the self-check current of the canister diagnostic assembly and the idle current of the canister diagnostic assembly; determining that the canister solenoid valve has a first failure according to the diagnostic current of the canister diagnostic assembly and the reference current of the canister diagnostic assembly; wherein, the reference current of the canister diagnostic assembly is determined by the self-check current of the canister diagnostic assembly and the idle current of the canister diagnostic assembly in the parked state. This solution improves the accuracy of the first failure detection of the canister solenoid valve and greatly reduces the detection cost.

Description

Technical Field

[0001] The present invention relates to an automobile gasoline adsorption technology, and in particular to a method, device, electronic device and storage medium for detecting a carbon canister solenoid valve failure. Background Art

[0002] The carbon canister solenoid valve is applied to the fuel evaporation desorption system. When the engine is running, the engine control unit ECU controls the carbon canister solenoid valve to open, and through the vacuum degree generated in the desorption pipeline during the operation of the engine, the oil vapor adsorbed in the desorption carbon canister is sucked into the engine combustion chamber for combustion, thereby achieving the purpose of reducing air pollution caused by fuel evaporation and improving fuel efficiency at the same time.

[0003] In the prior art, the carbon canister solenoid valve failure is diagnosed through the fuel system vacuum degree, and the monitored pressure point is located between the carbon canister solenoid valve and the desorption carbon canister. The detection accuracy of this detection method is relatively low. At the same time, this method requires an additional pressure sensor, resulting in a relatively high detection cost. Summary of the Invention

[0004] The present invention provides a method, device, electronic device and storage medium for detecting a carbon canister solenoid valve failure, so as to improve the accuracy of the first failure detection of the carbon canister solenoid valve and greatly reduce the detection cost.

[0005] In a first aspect, an embodiment of the present invention provides a method for detecting a carbon canister solenoid valve failure, the method including:

[0006] Identifying whether the carbon canister solenoid valve failure detection type is a first failure type according to the vehicle state information and the carbon canister solenoid valve state information;

[0007] If the carbon canister solenoid valve failure detection type is the first failure type, determining the self-check current of the carbon canister diagnostic assembly and the idle current of the carbon canister diagnostic assembly;

[0008] Determining the diagnostic current of the carbon canister diagnostic assembly according to the self-check current of the carbon canister diagnostic assembly and the idle current of the carbon canister diagnostic assembly;

[0009] Determining that the carbon canister solenoid valve has a first failure according to the diagnostic current of the carbon canister diagnostic assembly and the reference current of the carbon canister diagnostic assembly;

[0010] Wherein, the reference current of the carbon canister diagnostic assembly is determined by the self-check current of the carbon canister diagnostic assembly and the idle current of the carbon canister diagnostic assembly in the parked state.

[0011] Optionally, after determining that the carbon canister solenoid valve has a first failure according to the diagnostic current of the carbon canister diagnostic assembly and the reference current of the carbon canister diagnostic assembly, further including:

[0012] Identify whether the fault detection type of the canister purge solenoid valve is the second fault type according to the maximum operating current of the canister diagnostic assembly and the status information of the canister purge solenoid valve;

[0013] If the fault detection type of the canister purge solenoid valve is the second fault type, obtain the variable operating current of the canister diagnostic assembly;

[0014] Determine that the canister purge solenoid valve has a second fault according to the variable operating current of the canister diagnostic assembly.

[0015] Optionally, the vehicle status information includes desorption pipeline pressure information and engine vehicle speed information.

[0016] Optionally, determine that the canister purge solenoid valve has a first fault according to the diagnostic current of the canister diagnostic assembly and the reference current of the canister diagnostic assembly, specifically:

[0017] Determine the calibrated current of the canister diagnostic assembly according to the reference current of the canister diagnostic assembly and the calibration parameters;

[0018] When the diagnostic current of the canister diagnostic assembly is greater than the calibrated current of the canister diagnostic assembly, determine that the canister purge solenoid valve has a first fault.

[0019] Optionally, determining that the canister purge solenoid valve has a second fault according to the maximum operating current of the canister diagnostic assembly includes:

[0020] When the variable operating current of the canister diagnostic assembly is less than the preset variable operating current, determine that the canister purge solenoid valve has a second fault.

[0021] In a second aspect, an embodiment of the present invention further provides a canister purge solenoid valve fault detection device, and the device includes:

[0022] A fault detection module, configured to determine whether the fault detection type of the canister purge solenoid valve is the first fault type according to vehicle status information;

[0023] A first current determination module, configured to determine the self-check current of the canister diagnostic assembly and the idle current of the canister diagnostic assembly when the fault detection type of the canister purge solenoid valve is the first fault type;

[0024] A second current determination module, determining the diagnostic current of the canister diagnostic assembly according to the self-check current of the canister diagnostic assembly and the idle current of the canister diagnostic assembly;

[0025] A fault determination module, configured to determine that the canister purge solenoid valve has a first fault according to the diagnostic current of the canister diagnostic assembly and the reference current of the canister diagnostic assembly;

[0026] Wherein, the reference current of the canister diagnostic assembly is determined by the self-check current of the canister diagnostic assembly and the idle current of the canister diagnostic assembly in the parked state.

[0027] In a third aspect, an embodiment of the present invention further provides an electronic device, which includes:

[0028] at least one processor; and

[0029] a memory communicatively connected to the at least one processor; wherein,

[0030] the memory stores a computer program executable by the at least one processor, and when the computer program is executed by the at least one processor, the at least one processor is enabled to execute the carbon canister solenoid valve fault detection method in the first aspect above.

[0031] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, which stores computer instructions for enabling a processor to implement the carbon canister solenoid valve fault detection method described in the first aspect above when executed.

[0032] In the embodiment of the present invention, the carbon canister solenoid valve fault is detected according to the vehicle state information; it is identified whether the carbon canister solenoid valve fault detection type is the first fault type; if the carbon canister solenoid valve fault detection type is the first fault type, the self-check current of the carbon canister diagnostic assembly and the idle current of the carbon canister diagnostic assembly are determined; the diagnostic current of the carbon canister diagnostic assembly is determined according to the self-check current of the carbon canister diagnostic assembly and the idle current of the carbon canister diagnostic assembly; it is determined that the carbon canister solenoid valve has a first fault according to the diagnostic current of the carbon canister diagnostic assembly and the reference current of the carbon canister diagnostic assembly; wherein, the reference current of the carbon canister diagnostic assembly is determined by the self-check current of the carbon canister diagnostic assembly and the idle current of the carbon canister diagnostic assembly in the parked state. In this way, the accuracy of detecting the first fault of the carbon canister solenoid valve is improved, and the detection cost is greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a schematic flowchart of a carbon canister solenoid valve fault detection method provided by an embodiment of the present invention;

[0034] Figure 2 is a schematic structural diagram of a carbon canister solenoid valve fault detection system provided by an embodiment of the present invention;

[0035] Figure 3 is a specific schematic structural diagram of a carbon canister diagnostic assembly DMTL provided by an embodiment of the present invention;

[0036] Figure 4 is a schematic flowchart of another carbon canister solenoid valve fault detection method provided by an embodiment of the present invention;

[0037] Figure 5 is a schematic structural diagram of a carbon canister solenoid valve fault detection device provided by an embodiment of the present invention;

[0038] Figure 6 It is a schematic structural diagram of an electronic device provided by an embodiment of the present invention. Specific implementation manners

[0039] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. In addition, it should be noted that for the convenience of description, only parts related to the present invention are shown in the drawings, rather than all the structures.

[0040] Figure 1 It is a schematic flow diagram of a method for detecting a carbon canister solenoid valve failure provided by an embodiment of the present invention; as Figure 1 shown, this method can be executed by a device for detecting a carbon canister solenoid valve failure, and specifically includes the following steps:

[0041] S110. Identify whether the type of carbon canister solenoid valve failure detection is the first failure type according to the vehicle state information and the carbon canister solenoid valve state information.

[0042] Among them, the embodiments of the present invention are applicable to a carbon canister solenoid valve failure detection system. Figure 2 It is a schematic structural diagram of a carbon canister solenoid valve failure detection system provided by an embodiment of the present invention. As Figure 2 shown, the system includes an engine 10, a carbon canister adsorption system 20, and a fuel tank 30; the engine 10 is connected to the carbon canister adsorption system 20 through a desorption pipeline, and the carbon canister adsorption system 20 is connected to the fuel tank 30 through an adsorption pipeline; the carbon canister adsorption system 20 includes a carbon canister solenoid valve K and a carbon canister 21; the opening and closing of the carbon canister solenoid valve K can control whether the fuel in the fuel tank 30 enters the engine 10; generally, to prevent the fuel in the fuel tank from leaking into the atmosphere, the carbon canister adsorption system 20 can adsorb the evaporated fuel in the fuel tank 30 to the carbon canister; as the fuel in the engine continues to burn, a negative pressure is established in the engine intake manifold. At this time, the carbon canister solenoid valve K is in an open state, and the fuel in the carbon canister can be desorbed into the engine to supplement combustion; when the fuel in the carbon canister 21 reaches a preset value (the preset value is small), when the pressure information of the desorption pipeline between the engine 10 and the carbon canister adsorption system 20 reaches a preset pressure value, the carbon canister solenoid valve K is controlled to be in a closed state;

[0043] During the actual control of the closing process of the canister solenoid valve at this stage, since the canister solenoid valve may become stuck or have other faults, the canister solenoid valve may not be in a fully closed state. The fault detection type of the canister solenoid valve is an open fault type, that is, the first fault type. Specifically, when it is recognized that the desorption pipeline pressure information between the engine 10 and the canister adsorption system 20 reaches a preset pressure value, and after the engine vehicle speed information reaches a preset vehicle speed, and at the same time the canister solenoid valve status information indicates that the canister solenoid valve is in the closed state, the fault detection type of the canister solenoid valve is the first fault type.

[0044] S120. If the fault detection type of the canister solenoid valve is the first fault type, determine the self-check current of the canister diagnostic assembly and the idle current of the canister diagnostic assembly.

[0045] Among them, as Figure 2 shown, the canister adsorption system 20 is also provided with a canister diagnostic assembly DMTL22; Figure 3 is a specific structural schematic diagram of the canister diagnostic assembly DMTL provided by an embodiment of the present invention; as Figure 3 shown, the canister diagnostic assembly DMTL22 includes an air filter 221, an electric vacuum pump 222, a reference hole 223, and a commutation valve 224; when the canister solenoid valve K is closed, the normal operation of the canister diagnostic assembly DMTL is divided into two stages: the first stage is to first determine whether the function of the canister diagnostic assembly DMTL is normal. The measurement process is as follows: the electronic control unit first controls the electric vacuum pump 222 to work at a standard speed (this standard speed corresponds to the self-check current of the canister diagnostic assembly in this embodiment), and the switching valve 223 is not energized. The air flow direction is: air filter 221 → electric vacuum pump 222 → reference hole 223 → commutation valve 224 (right position) → air filter 221;

[0046] The second stage is: control the electric vacuum pump 222 to start working at the minimum speed, the switching valve 223 is energized, and the air flow direction is: air filter 221 → commutation valve 224 (left position) → canister 21 → fuel tank 30. As the air volume in the canister 21 increases, the speed of driving the electric vacuum pump 222 gradually increases. When the speed of driving the electric vacuum pump 222 increases to a preset speed, the canister solenoid valve K opens; in this embodiment, the idle current of the canister diagnostic assembly is the minimum speed of the electric vacuum pump 222 when the canister diagnostic assembly DMTL22 is in the second stage of operation.

[0047] S130. Determine the diagnostic current of the canister diagnostic assembly according to the self-check current of the canister diagnostic assembly and the idle current of the canister diagnostic assembly.

[0048] Among them, in this embodiment, during the actual closing process of the canister purge solenoid valve, the self-check current of the canister diagnostic assembly in the first stage and the idle current of the canister diagnostic assembly in the second stage are collected, and the difference between the self-check current of the canister diagnostic assembly in the first stage and the idle current of the canister diagnostic assembly in the second stage is used to determine the diagnostic current of the canister diagnostic assembly.

[0049] S140. Determine that the canister purge solenoid valve has a first fault according to the diagnostic current of the canister diagnostic assembly and the reference current of the canister diagnostic assembly.

[0050] Among them, the reference current of the canister diagnostic assembly is determined by the difference between the self-check current of the canister diagnostic assembly collected in the first stage and the idle current of the canister diagnostic assembly collected in the second stage in the parked state; further, the calibrated current of the canister diagnostic assembly is determined according to the reference current of the canister diagnostic assembly and the calibration parameters; when the diagnostic current of the canister diagnostic assembly is greater than the calibrated current of the canister diagnostic assembly, it is determined that the canister purge solenoid valve has a first fault; specifically:

[0051] The diagnostic current of the canister diagnostic assembly ≥ a * the reference current of the canister diagnostic assembly; a is a calibration parameter; it can be determined according to different vehicle parameters;

[0052] In addition, it should be noted that in this embodiment, when a normally open fault occurs, a fault code is reported; it is detected again whether a normally open fault occurs. If a normally open fault occurs continuously for two detections, the control response instrument light is turned on. And when a normally open fault does not occur continuously for n (n ≥ 3) times, the control response instrument light is turned off; when a normally open fault does not occur continuously for m (m ≥ 10) times, the fault code can be cleared.

[0053] In this embodiment, the fault detection type of the canister purge solenoid valve is identified according to the vehicle state information; if the fault detection type of the canister purge solenoid valve is the first fault type, the self-check current of the canister diagnostic assembly and the idle current of the canister diagnostic assembly are determined; the diagnostic current of the canister diagnostic assembly is determined according to the self-check current of the canister diagnostic assembly and the idle current of the canister diagnostic assembly; it is determined that the canister purge solenoid valve has a first fault according to the diagnostic current of the canister diagnostic assembly and the reference current of the canister diagnostic assembly; in this way, the accuracy of the first fault detection of the canister purge solenoid valve is improved, and the detection cost is greatly reduced.

[0054] Optionally, on the basis of the above embodiment, another fault of the canister purge solenoid valve is further detected. Figure 4 The flow schematic diagram of another method for detecting the fault of the canister purge solenoid valve provided by the embodiment of the present invention; as Figure 4 shown, this method includes the following steps:

[0055] S210. Identify whether the fault detection type of the canister purge solenoid valve is the first fault type according to the vehicle state information and the canister purge solenoid valve state information.

[0056] Among them, the vehicle status information includes not only the desorption pipeline pressure information between the engine and the carbon canister adsorption system, the engine speed information, and the carbon canister solenoid valve closed state information, but also the engine water temperature status information and the ambient temperature information. The engine water temperature status information is the status information of the water temperature in the engine's internal water cooling cycle, and the ambient temperature information is the ambient temperature status during the carbon canister solenoid valve fault detection.

[0057] S220. If the carbon canister solenoid valve fault detection type is the first fault type, determine the self-check current of the carbon canister diagnostic assembly and the idle current of the carbon canister diagnostic assembly.

[0058] S230. Determine the diagnostic current of the carbon canister diagnostic assembly according to the self-check current of the carbon canister diagnostic assembly and the idle current of the carbon canister diagnostic assembly.

[0059] S240. Determine that the carbon canister solenoid valve has a first fault according to the diagnostic current of the carbon canister diagnostic assembly and the reference current of the carbon canister diagnostic assembly.

[0060] S250. Identify whether the carbon canister solenoid valve fault detection type is the second fault type according to the maximum working current of the carbon canister diagnostic assembly and the carbon canister solenoid valve status information.

[0061] Among them, when the carbon canister diagnostic assembly DMTL is in the second working stage, as the air volume in the carbon canister 21 increases, the speed of driving the electric vacuum pump 222 gradually increases. When the speed of driving the electric vacuum pump 222 increases to the preset speed, the carbon canister solenoid valve K opens, that is, the current of driving the electric vacuum pump 222 gradually increases. When the maximum working current of the carbon canister diagnostic assembly is greater than the preset maximum working current, at this time, control the carbon canister solenoid valve K to open. Since in the actual process of controlling the carbon canister solenoid valve to open in this stage, due to the carbon canister solenoid valve being stuck or having other faults, the carbon canister solenoid valve will not be in a fully open state, and the carbon canister solenoid valve fault detection type is the normally closed fault type, that is, the second fault type. Specifically, when it is recognized that the maximum working current of the carbon canister diagnostic assembly is greater than the preset maximum working current, and at the same time the carbon canister solenoid valve status information is that the carbon canister solenoid valve is in the open state, then the carbon canister solenoid valve fault detection type is the second fault type.

[0062] S260. If the carbon canister solenoid valve fault detection type is the second fault type, obtain the variable working current of the carbon canister diagnostic assembly.

[0063] Among them, such as Figure 4As shown in the figure, when the canister purge solenoid valve is opened, the working mode of the canister diagnostic assembly DMTL is that under the action of the electric vacuum pump 222, fresh air passes through the air filter 221, the switching valve 223 (left position), and the canister 21, taking away the fuel vapor in the canister 21 and entering the engine 30 for combustion, that is, the fuel adsorption process; the air flow direction is: air filter 221 → switching valve 223 → canister 21 → canister purge solenoid valve K → engine 30. Since the pressure in the desorption pipeline decreases when the canister purge solenoid valve is opened, the working current of the driving electric vacuum pump 222 gradually decreases until the canister purge solenoid valve is fully opened, and the working current of the driving electric vacuum pump 222 does not change.

[0064] The changed working current of the canister diagnostic assembly is the current difference between the maximum working current of the canister diagnostic assembly before the canister purge solenoid valve is opened and the minimum working current of the driving electric vacuum pump 222 after the canister purge solenoid valve is opened.

[0065] S270. Determine that the canister purge solenoid valve has a second fault according to the changed working current of the canister diagnostic assembly.

[0066] It can be understood that when the changed working current of the canister diagnostic assembly is less than the preset current difference, the canister purge solenoid valve has a second fault; on the contrary, when the changed working current of the canister diagnostic assembly is equal to the preset current difference, it is determined that the canister purge solenoid valve is in a normal fully open state;

[0067] It should be noted that in this embodiment, when a normally closed fault occurs, a fault code is reported; it is detected again whether a normally closed fault occurs. If a normally closed fault occurs continuously twice, the control response instrument light is turned on. And when a normally closed fault does not occur continuously n (n≥3) times, the control response instrument light is turned off; when a normally closed fault does not occur continuously m (m≥10) times, the fault code can be cleared.

[0068] In the embodiment of the present invention, on the basis of the above embodiment, it is further optimized, further improving the detection accuracy of the second fault of the canister purge solenoid valve, and the detection cost is greatly reduced. In this way, this solution realizes the judgment of different fault types of the canister purge solenoid valve.

[0069] The embodiment of the present invention also provides a canister purge solenoid valve fault detection device. The canister purge solenoid valve fault detection device can execute the canister purge solenoid valve fault detection method provided by any embodiment of the present invention, and has the corresponding function modules and beneficial effects for executing the method. Figure 5 is a structural schematic diagram of the canister purge solenoid valve fault detection device provided by the embodiment of the present invention. As Figure 5 shown, the device includes:

[0070] A fault detection module 100, configured to determine whether the canister purge solenoid valve fault detection type is the first fault type according to the vehicle state information and the canister purge solenoid valve state information;

[0071] The first current determination module 200 is configured to determine the self-check current of the canister diagnostic assembly and the idle current of the canister diagnostic assembly when the failure detection type of the canister solenoid valve is the first failure type;

[0072] The second current determination module 300 determines the diagnostic current of the canister diagnostic assembly according to the self-check current of the canister diagnostic assembly and the idle current of the canister diagnostic assembly;

[0073] The first failure determination module 400 is configured to determine that the canister solenoid valve has a first failure according to the diagnostic current of the canister diagnostic assembly and the reference current of the canister diagnostic assembly;

[0074] Wherein, the reference current of the canister diagnostic assembly is determined by the self-check current of the canister diagnostic assembly and the idle current of the canister diagnostic assembly in the parked state

[0075] Optionally, it further includes:

[0076] The second identification module is configured to identify whether the failure detection type of the canister solenoid valve is the second failure type according to the maximum operating current of the canister diagnostic assembly and the status information of the canister solenoid valve;

[0077] The third current determination module is configured to obtain the variable operating current of the canister diagnostic assembly when the failure detection type of the canister solenoid valve is the second failure type;

[0078] The second failure determination module is configured to determine that the canister solenoid valve has a second failure according to the variable operating current of the canister diagnostic assembly.

[0079] Optionally, the vehicle state information includes desorption pipeline pressure information and engine speed information.

[0080] Optionally, the first failure determination module is specifically configured to:

[0081] Determine the calibrated current of the canister diagnostic assembly according to the reference current of the canister diagnostic assembly and the calibration parameters;

[0082] When the diagnostic current of the canister diagnostic assembly is greater than the calibrated current of the canister diagnostic assembly, it is determined that the canister solenoid valve has a first failure.

[0083] Optionally, the second failure determination module is specifically configured to:

[0084] When the variable operating current of the canister diagnostic assembly is less than the preset variable operating current, it is determined that the canister solenoid valve has a second failure.

[0085] Figure 6 It is a schematic structural diagram of a device provided by an embodiment of the present invention, as Figure 6As shown in the figure, the device includes a processor 70, a memory 71, an input device 72, and an output device 73; the number of processors 70 in the device can be one or more, Figure 6 Taking one processor 70 as an example; the processor 70, memory 71, input device 72, and output device 73 in the device can be connected through a bus or other means, Figure 6 Taking connection through a bus as an example.

[0086] The memory 71, as a computer-readable storage medium, can be used to store software programs, computer-executable programs, and modules, such as the program instructions / modules corresponding to the carbon canister solenoid valve fault detection method in the embodiments of the present invention. The processor 70 executes various functional applications and data processing of the device by running the software programs, instructions, and modules stored in the memory 71, that is, implements the above-mentioned carbon canister solenoid valve fault detection method.

[0087] The memory 71 mainly includes a program storage area and a data storage area. Among them, the program storage area can store an operating system and application programs required for at least one function; the data storage area can store data created according to the use of the terminal, etc. In addition, the memory 71 can include high-speed random access memory, and can also include non-volatile memory, such as at least one magnetic disk storage device, a flash memory device, or other non-volatile solid-state storage devices. In some instances, the memory 71 can further include a memory remotely set relative to the processor 70, and these remote memories can be connected to the device through a network. Examples of the above network include but are not limited to the Internet, an enterprise intranet, a local area network, a mobile communication network, and combinations thereof.

[0088] The input device 72 can be used to receive input digital or character information, and generate key signal inputs related to the user settings and function control of the device. The output device 73 can include a display device such as a display screen.

[0089] The embodiments of the present invention also provide a storage medium containing computer-executable instructions, and the computer-executable instructions are used to execute a carbon canister solenoid valve fault detection method when executed by a computer processor. The method includes:

[0090] Identifying whether the carbon canister solenoid valve fault detection type is the first fault type according to the vehicle state information and the carbon canister solenoid valve state information;

[0091] If the carbon canister solenoid valve fault detection type is the first fault type, determining the self-check current of the carbon canister diagnostic assembly and the idle current of the carbon canister diagnostic assembly;

[0092] Determining the diagnostic current of the carbon canister diagnostic assembly according to the self-check current of the carbon canister diagnostic assembly and the idle current of the carbon canister diagnostic assembly;

[0093] Determine that a first fault has occurred in the canister solenoid valve based on the diagnostic current of the canister diagnostic assembly and the reference current of the canister diagnostic assembly;

[0094] Among them, the reference current of the canister diagnostic assembly is determined by the self-check current of the canister diagnostic assembly and the idle current of the canister diagnostic assembly in the parked state.

[0095] Of course, a storage medium containing computer-executable instructions provided by an embodiment of the present invention, the computer-executable instructions are not limited to the method operations described above, and can also execute relevant operations in the canister solenoid valve fault detection method provided by any embodiment of the present invention.

[0096] From the above description of the embodiments, those skilled in the art can clearly understand that the present invention can be implemented by means of software and necessary general-purpose hardware. Of course, it can also be implemented by hardware, but in many cases the former is a better implementation. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. The computer software product can be stored in a computer-readable storage medium, such as a floppy disk, read-only memory (ROM), random access memory (RAM), flash memory (FLASH), hard disk or optical disc of a computer, etc., including several instructions to enable a computer device (which can be a personal computer, server, or network device, etc.) to execute the methods described in various embodiments of the present invention.

[0097] It should be noted that in the embodiments of the above search device, the various units and modules included are only divided according to functional logic, but are not limited to the above division, as long as the corresponding functions can be realized; in addition, the specific names of the functional units are only for the convenience of mutual distinction and do not limit the protection scope of the present invention.

[0098] Note that the above is only a preferred embodiment of the present invention and the technical principles applied. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the concept of the present invention, more other equivalent embodiments can be included, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A method for detecting a failure of a carbon canister solenoid valve, characterized in that, Including: Identifying whether the fault detection type of the canister purge solenoid valve is the first fault type according to the vehicle state information and the canister purge solenoid valve state information; If the fault detection type of the canister purge solenoid valve is the first fault type, determining the self-check current of the canister diagnostic assembly and the idle current of the canister diagnostic assembly; wherein, the idle current of the canister diagnostic assembly is the current corresponding to the minimum speed of the electric vacuum pump in the canister diagnostic assembly when the canister diagnostic assembly is in the second stage of operation; the second stage is that the air flow passes through the air filter in the canister diagnostic assembly, the switching valve in the canister diagnostic assembly, the canister in the canister diagnostic assembly, and the fuel tank in sequence; Determining the diagnostic current of the canister diagnostic assembly according to the self-check current of the canister diagnostic assembly and the idle current of the canister diagnostic assembly; Determining that the canister purge solenoid valve has a first fault according to the diagnostic current of the canister diagnostic assembly and the reference current of the canister diagnostic assembly; Wherein, the reference current of the canister diagnostic assembly is determined by the self-check current of the canister diagnostic assembly and the idle current of the canister diagnostic assembly in the parked state.

2. The method for detecting a failure of a canister solenoid valve according to claim 1, wherein After determining that the canister purge solenoid valve has a first fault according to the diagnostic current of the canister diagnostic assembly and the reference current of the canister diagnostic assembly, further including: Identifying whether the fault detection type of the canister purge solenoid valve is the second fault type according to the maximum operating current of the canister diagnostic assembly and the canister purge solenoid valve state information; If the fault detection type of the canister purge solenoid valve is the second fault type, obtaining the variable operating current of the canister diagnostic assembly; wherein, the variable operating current of the canister diagnostic assembly is the current difference between the maximum operating current of the canister diagnostic assembly before the canister purge solenoid valve is opened and the minimum operating current for driving the electric vacuum pump after the canister purge solenoid valve is opened; Determining that the canister purge solenoid valve has a second fault according to the variable operating current of the canister diagnostic assembly.

3. The method for detecting the failure of the carbon canister solenoid valve according to claim 1, wherein, The vehicle state information includes desorption pipeline pressure information and driving speed information.

4. The method for detecting a failure of a canister solenoid valve according to claim 1, wherein Determining that the canister purge solenoid valve has a first fault according to the diagnostic current of the canister diagnostic assembly and the reference current of the canister diagnostic assembly, specifically: Determining the calibrated current of the canister diagnostic assembly according to the reference current of the canister diagnostic assembly and the calibration parameters; When the diagnostic current of the canister diagnostic assembly is greater than the calibrated current of the canister diagnostic assembly, it is determined that the canister purge solenoid valve has a first fault.

5. The method for detecting the failure of the canister solenoid valve according to claim 2, wherein, Determining that the canister purge solenoid valve has a second fault according to the variable operating current of the canister diagnostic assembly, including: When the variable operating current of the canister diagnostic assembly is less than the preset variable operating current, it is determined that the canister purge solenoid valve has a second fault.

6. A carbon canister solenoid valve fault detection device, characterized in that Including: A fault detection module, configured to identify whether the fault detection type of the canister purge solenoid valve is the first fault type according to the vehicle state information and the canister purge solenoid valve state information; A first current determination module, configured to determine a self-check current of a canister diagnostic assembly and an idle current of the canister diagnostic assembly when the failure detection type of the canister solenoid valve is the first failure type; wherein, the idle current of the canister diagnostic assembly is the current corresponding to the minimum speed of an electric vacuum pump in the canister diagnostic assembly when the canister diagnostic assembly is in the second stage of operation; the second stage is that the air flow sequentially passes through an air filter in the canister diagnostic assembly, a switching valve in the canister diagnostic assembly, a canister in the canister diagnostic assembly, and a fuel tank. A second current determination module, configured to determine a diagnostic current of the canister diagnostic assembly according to the self-check current of the canister diagnostic assembly and the idle current of the canister diagnostic assembly. A failure determination module, configured to determine that the canister solenoid valve has a first failure according to the diagnostic current of the canister diagnostic assembly and a reference current of the canister diagnostic assembly. Wherein, the reference current of the canister diagnostic assembly is determined by the self-check current of the canister diagnostic assembly and the idle current of the canister diagnostic assembly in the parked state.

7. An electronic device, characterized in that, The electronic device includes: At least one processor; and A memory communicatively connected to the at least one processor; wherein, The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the canister solenoid valve failure detection method according to any one of claims 1-5.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions, and the computer instructions are used to implement the canister solenoid valve failure detection method according to any one of claims 1-5 when executed by a processor.

Images