A method, device and vehicle-mounted terminal for detecting abnormal pump current of a DMTL pump

Abstract

The present application discloses a method, device and vehicle-mounted terminal for detecting abnormal pump current of a DMTL pump. Through the technical solution provided in the embodiments of the present application, in the process of leak diagnosis, the first pump current difference of the DMTL pump of the target vehicle is obtained, and the first pump current difference is the difference between the highest pump current and the lowest pump current of the DMTL pump in the first time period. In the case where the first pump current difference is greater than the first pump current difference threshold, the second pump current difference of the DMTL pump of the target vehicle is obtained, and the second pump current difference is the difference between the highest pump current and the lowest pump current of the DMTL pump in the second time period. In the case where the second pump current difference is less than or equal to the second pump current difference threshold, it is determined that there is no abnormality in the pump current fluctuation of the DMTL pump, and leak diagnosis can continue, avoiding the influence of excessive pump current fluctuation on the reliability of leak diagnosis.

Description

Technical Field

[0001] The present application belongs to the field of vehicle technology, and in particular relates to a method, device and vehicle-mounted terminal for detecting abnormal pump current of a DMTL pump. Background Art

[0002] In order to improve the environmental friendliness of vehicles and prevent fuel vapor from leaking into the atmosphere, it is necessary to perform leakage diagnosis on the vehicle. DMTL (Diagnostic Module Tank Leakage) is one of the methods for leak diagnosis. It is performed after the vehicle is powered off and is mainly diagnosed based on the corresponding relationship between the current of the air pump and the fuel tank pressure.

[0003] When the DMTL is used in a vehicle, water vapor may condense on the pump, which will cause changes in mechanical friction and thus cause fluctuations in the pump current. Excessive fluctuations in the pump current will have a significant impact on the reliability of leak diagnosis. Summary of the invention

[0004] The present application discloses a method, a device and a vehicle-mounted terminal for detecting abnormal pump current of a DMTL pump, which can improve the reliability of leakage diagnosis.

[0005] On the one hand, an embodiment of the present application provides a method for detecting abnormal pump current of a DMTL pump, the method comprising:

[0006] In a process of performing leakage diagnosis on a target vehicle, obtaining a first pump current difference value of a DMTL pump of the target vehicle, wherein the first pump current difference value is a difference between a highest pump current and a lowest pump current of the DMTL pump in a first time period;

[0007] When the first pump current difference is greater than a first pump current difference threshold, obtaining a second pump current difference of the DMTL pump of the target vehicle, wherein the second pump current difference is a difference between a highest pump current and a lowest pump current of the DMTL pump in a second time period, and the second time period is separated from the first time period by a first preset time length;

[0008] When the second pump current difference is less than or equal to a second pump current difference threshold, it is determined that the pump current fluctuation of the DMTL pump is normal.

[0009] In a possible implementation manner, in the process of performing leakage diagnosis on the target vehicle, obtaining a first pump current difference of a DMTL pump of the target vehicle includes:

[0010] During the leak diagnosis of the target vehicle, the solenoid valve is controlled to close and the DMTL pump is started to pump air into the reference hole of the DMTL pump;

[0011] When the reference pump current of the DMTL pump is obtained, a first pump current difference of the DMTL pump of the target vehicle is obtained.

[0012] In a possible implementation manner, when a reference pump current of the DMTL pump is obtained, obtaining a first pump current difference of the DMTL pump of the target vehicle, wherein the reference pump current is a stable pump current, includes:

[0013] When the reference pump current of the DMTL pump is obtained, starting to continuously obtain the pump current of the DMTL pump in the first time period after a second preset time interval;

[0014] The first pump current difference is obtained by subtracting the highest pump current and the lowest pump current of the DMTL pump in the first time period.

[0015] In a possible implementation manner, in the process of performing leakage diagnosis on the target vehicle, obtaining a first pump current difference of a DMTL pump of the target vehicle includes:

[0016] During the process of leak diagnosis on the target vehicle, determining whether the target vehicle meets the diagnosis condition;

[0017] In a case where the target vehicle satisfies the diagnostic condition, a first pump current difference of a DMTL pump of the target vehicle is acquired.

[0018] In a possible implementation manner, when the first pump current difference is greater than a first pump current difference threshold, acquiring a second pump current difference of the DMTL pump of the target vehicle includes:

[0019] When the first pump current difference is greater than a first pump current difference threshold, starting to continuously acquire the pump current of the DMTL pump in the second time period after the first preset time interval;

[0020] The highest pump current and the lowest pump current of the DMTL pump in the second time period are subtracted from each other to obtain the second pump current difference.

[0021] In a possible implementation manner, after obtaining the second pump current difference of the DMTL pump of the target vehicle when the first pump current difference is greater than the first pump current difference threshold, the method further includes:

[0022] When the second pump current difference is greater than a second pump current difference threshold, it is determined that there is an abnormality in the pump current fluctuation of the DMTL pump.

[0023] In a possible implementation manner, when the second pump current difference is greater than a second pump current difference threshold, after determining that the pump current fluctuation of the DMTL pump is abnormal, the method further includes:

[0024] The leak diagnosis process for the target vehicle is terminated.

[0025] In a possible implementation manner, during the process of performing leakage diagnosis on the target vehicle, after obtaining the first pump current difference of the DMTL pump of the target vehicle, the method further includes:

[0026] When the first pump current difference is less than or equal to the first pump current difference threshold, it is determined that the pump current fluctuation of the DMTL pump is normal.

[0027] On the one hand, an embodiment of the present application provides a device for detecting abnormal pump current of a DMTL pump, the device comprising:

[0028] A first pump current difference acquisition module, used for acquiring a first pump current difference of a DMTL pump of the target vehicle during leakage diagnosis of the target vehicle, wherein the first pump current difference is a difference between a maximum pump current and a minimum pump current of the DMTL pump in a first time period;

[0029] A second pump current difference acquisition module, configured to acquire a second pump current difference of the DMTL pump of the target vehicle when the first pump current difference is greater than a first pump current difference threshold, wherein the second pump current difference is a difference between a maximum pump current and a minimum pump current of the DMTL pump in a second time period, and the second time period is separated from the first time period by a first preset time length;

[0030] The abnormality determination module is used to determine that the pump current fluctuation of the DMTL pump is normal when the second pump current difference is less than or equal to a second pump current difference threshold.

[0031] In a possible implementation, the first pump current difference acquisition module is used to control the solenoid valve to close and start the DMTL pump to pump air into the reference hole of the DMTL pump during leakage diagnosis of the target vehicle; and to acquire the first pump current difference of the DMTL pump of the target vehicle when the reference pump current of the DMTL pump is acquired.

[0032] In one possible implementation, the first pump current difference acquisition module is used to, when a reference pump current of the DMTL pump is acquired, start continuously acquiring the pump current of the DMTL pump within the first time period after an interval of a second preset time period; and subtract the highest pump current and the lowest pump current of the pump current of the DMTL pump within the first time period to obtain the first pump current difference.

[0033] In a possible implementation manner, the first pump current difference acquisition module is used to determine whether the target vehicle meets the diagnostic conditions during leakage diagnosis of the target vehicle; if the target vehicle meets the diagnostic conditions, obtain the first pump current difference of the DMTL pump of the target vehicle.

[0034] In one possible implementation, the second pump current difference acquisition module is used to, when the first pump current difference is greater than the first pump current difference threshold, start continuously acquiring the pump current of the DMTL pump in the second time period after the first preset time interval; and subtract the highest pump current and the lowest pump current of the pump current of the DMTL pump in the second time period to obtain the second pump current difference.

[0035] In a possible implementation manner, the abnormality determination module is further configured to determine that there is an abnormality in the pump current fluctuation of the DMTL pump when the second pump current difference is greater than a second pump current difference threshold.

[0036] In a possible implementation, the device further includes:

[0037] The termination module is used to terminate the leakage diagnosis process of the target vehicle.

[0038] In a possible implementation manner, the abnormality determination module is further configured to determine that the pump current fluctuation of the DMTL pump is normal when the first pump current difference is less than or equal to the first pump current difference threshold.

[0039] In one aspect, a vehicle-mounted terminal is provided, the vehicle-mounted terminal comprising:

[0040] At least one processor and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the aforementioned method for detecting pump current anomalies of the DMTL pump.

[0041] On the one hand, a non-transitory computer-readable storage medium stores computer instructions for causing the computer to execute the aforementioned method for detecting pump current abnormality of a DMTL pump.

[0042] On the one hand, an embodiment of the present application also provides a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium, and the computer program includes program instructions. When the program instructions are executed by a vehicle-mounted terminal, the vehicle-mounted terminal executes the aforementioned method for detecting pump current abnormality of the DMTL pump.

[0043] Through the technical solution provided by the embodiment of the present application, during the process of leakage diagnosis, the first pump current difference of the DMTL pump of the target vehicle is obtained, and the first pump current difference is the difference between the highest pump current and the lowest pump current of the DMTL pump in the first time period. In the case where the first pump current difference is greater than the first pump current difference threshold, the second pump current difference of the DMTL pump of the target vehicle is obtained, and the second pump current difference is the difference between the highest pump current and the lowest pump current of the DMTL pump in the second time period. In the case where the second pump current difference is less than or equal to the second pump current difference threshold, it is determined that there is no abnormality in the pump current fluctuation of the DMTL pump, and leakage diagnosis can continue, avoiding the influence of excessive pump current fluctuation on the reliability of leakage diagnosis. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solution of the present application and facilitate further understanding of the technical effects, technical features and purposes of the present application, the present application is described in detail below in conjunction with the accompanying drawings. The accompanying drawings constitute an essential part of the specification and are used together with the embodiments of the present application to illustrate the technical solution of the present application, but do not constitute a limitation to the present application.

[0045] Figure 1 A schematic diagram of an implementation environment provided for an embodiment of the present application;

[0046] Figure 2 A schematic diagram of different stages of leakage diagnosis provided by an embodiment of the present application;

[0047] Figure 3 A flow chart of a method for detecting abnormal pump current of a DMTL pump provided in an embodiment of the present application;

[0048] Figure 4 A flow chart of another method for detecting abnormal pump current of a DMTL pump provided in an embodiment of the present application;

[0049] Figure 5 A flowchart of another method for detecting abnormal pump current of a DMTL pump provided in an embodiment of the present application;

[0050] Figure 6 A schematic diagram of pump current recording provided in an embodiment of the present application;

[0051] Figure 7 A schematic diagram of the structure of a device for detecting abnormal pump current of a DMTL pump provided in an embodiment of the present application;

[0052] Figure 8 A schematic diagram of the structure of a vehicle-mounted terminal provided in an embodiment of the present application. DETAILED DESCRIPTION

[0053] The following describes the implementation methods of the present application through specific specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific implementation methods, and the various details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, in the absence of conflict, the features in the following embodiments and embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by ordinary staff in the field without making creative work belong to the scope of protection of the present application.

[0054] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on the present application, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects set forth herein can be used to implement an apparatus and / or practice a method.

[0055] It should also be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present application in a schematic manner. The drawings only show the components related to the present application rather than being drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0056] Additionally, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the described aspects may be practiced without these specific details.

[0057] Intake manifold: For carbureted or throttle body gasoline injection engines, the intake manifold refers to the intake pipe from the carburetors or throttle bodies to the cylinder head intake ducts. Its function is to distribute the air and fuel mixture from the carburetors or throttle bodies to the intake ducts of each cylinder. For port fuel injection engines or diesel engines, the intake manifold only distributes clean air to the intake ducts of each cylinder. The intake manifold must distribute the air, fuel mixture or clean air to each cylinder as evenly as possible, so the length of the gas flow channel in the intake manifold should be as equal as possible. In order to reduce the gas flow resistance and improve the intake capacity, the inner wall of the intake manifold should be smooth.

[0058] EMS (Engine Management System): EMS uses various sensors to convert the engine's intake air volume, cooling water temperature, engine speed, acceleration and deceleration into electrical signals and send them to the controller. The controller compares this information with the stored information, and outputs the control signal after accurate calculation. EMS can not only accurately control the fuel supply to replace the traditional carburetor, but also control the ignition advance angle and idle air flow, etc., greatly improving the engine performance.

[0059] CAN (Controller Area Network): CAN is designed as a microcontroller communication in the vehicle environment, exchanging information between various electronic control devices ECU on board to form a vehicle electronic control network. For example: CAN control devices are embedded in the engine management system, transmission controller, instrument equipment, and electronic backbone system. In theory, countless nodes can be connected to a single network composed of a CAN bus. In practical applications, the number of nodes is limited by the electrical characteristics of the network hardware. For example, when Philips P82C250 is used as a CAN transceiver, 110 nodes are allowed to be connected to the same network. CAN can provide a data transmission rate of up to 1Mbit / s, which makes real-time control very easy. In addition, the hardware error detection feature also enhances CAN's ability to resist electromagnetic interference.

[0060] Leak Diagnosis: Diagnose whether the vehicle has a fuel leak.

[0061] DMTL: Diagnostic Module Tank Leakage, fuel tank leakage diagnostic module. When the diagnosis is started, DMTL will first perform a comparative measurement. During the comparative measurement process, a current reference value equivalent to the pressure change when there is a 0.5mm leak hole in the system will be established. After that, formal leakage diagnosis will be performed. When the current value measured by DMTL is greater than the reference value, it indicates that there is no leakage in the system; when the current value measured by DMTL is close to the reference value, it indicates that there is a small leakage in the system; when the current value measured by DMTL is less than the reference value, it indicates that there is a large leakage in the system.

[0062] Carbon canister: Carbon canister is usually installed between the gasoline tank and the engine. Since gasoline is a volatile liquid, the fuel tank is often filled with vapor at room temperature. The role of the fuel evaporative emission control system is to introduce vapor into combustion and prevent it from volatilizing into the atmosphere. The activated carbon canister storage device plays an important role in this process.

[0063] Figure 1 Schematic diagram of the implementation environment of the method for detecting abnormal pump current of a DMTL pump provided in an embodiment of the present application, see Figure 1 The implementation environment includes a vehicle terminal 110 and a DMTL 140.

[0064] The vehicle terminal 110 is used to control the target vehicle. In the embodiment of the present application, the vehicle terminal 110 is also called a vehicle control unit (VCU), an engine control unit (EMS) or a transmission control unit (TCU), etc., which is not limited in the embodiment of the present application.

[0065] DMTL140 is used to perform leak diagnosis on vehicles.

[0066] The vehicle terminal 110 and the DMTL 140 are connected via wire or wirelessly.

[0067] After introducing the implementation environment of the embodiments of the present application, the application scenarios of the embodiments of the present application are described below.

[0068] The method for detecting pump current abnormality of a DMTL pump provided in the embodiment of the present application can be applied to any vehicle that includes a DMTL pump. By adopting the technical solution provided in the embodiment of the present application, the reliability of the leakage diagnosis result can be judged when the vehicle is leak diagnosed using the DMTL pump. Specifically, the reliability is judged by the pump current of the DMTL pump. The judgment process does not require the addition of new hardware and can be implemented on the basis of the existing hardware structure. The implementation cost is low.

[0069] See also Figure 2 ,Leakage diagnosis includes three stages: A, B and C. Stage A is the reference stage, stage B is the idle current measurement stage, and stage C is the diagnosis stage.

[0070] against Figure 2 The three stages of leak diagnosis A, B and C are explained:

[0071] Phase A: Measuring the reference pump current

[0072] Before the leak diagnosis begins, the canister valve has been closed for a while. The gas in the fuel tank system can communicate with the atmosphere through the canister and DMTL components, so the initial pressure in the fuel tank system is atmospheric pressure. After the diagnostic conditions are met, the DMTL pump starts to operate and pumps air into the 0.5mm reference hole. After a period of time, the power of the pump and the resistance of the air pumping into the reference hole are balanced, and the pump current is stable. This stable pump current is the reference pump current, and the system calculates the reference pump current frequency.

[0073] Phase B: Measuring the idle pump current

[0074] After the reference pump current measurement is completed, the solenoid valve in the DMTL component is closed, and air is no longer pumped into the reference hole, but into the tank system. Since the initial pressure of the tank system is atmospheric pressure, the pump is in an idling state for a short period of time after the solenoid valve is closed, and the pump current drops rapidly; as more and more air is pumped into the tank, the tank pressure gradually increases, that is, the pump air resistance increases, and the pump current also gradually increases. The minimum pump current after the solenoid valve is closed is called the idle pump current.

[0075] Stage C: 1mm diagnostic stage

[0076] If there is no gross leakage fault, the tank pressure will reach the set target pressure value and the C stage will end. When the DMTL pump is pumping gas into the tank, the system calculates the relative pressure of the tank and determines whether there is a 1mm leak based on the pressure. If the relative pressure of the tank is higher than the diagnostic threshold, it is determined that there is no leakage and the diagnosis is exited; if the relative pressure of the tank is always lower than the diagnostic threshold within the calibration time, the P0442 fault is reported.

[0077] In phases A and C, the pump current fluctuation out-of-range diagnosis will be performed. The diagnosis principle is:

[0078] When DMTL is used on a vehicle, water vapor may condense on the pump, which will cause changes in mechanical friction and thus cause fluctuations in the pump current. Excessive fluctuations in the pump current will have a significant impact on the reliability of leak diagnosis. When this happens, leak diagnosis needs to be suppressed. There are two types of detection of pump current fluctuations beyond the range: one is the reference pump current stage, and the other is the diagnosis stage. The method for the reference pump current stage is described as follows:

[0079] After the vehicle enters and runs, the diagnostic conditions are met, the DMTL valve will close, and the DMTL pump will start to operate, pumping air into the 0.5mm reference hole. After a period of time, the power of the pump and the resistance of the air pumping into the reference hole are balanced, and the pump current is stable. This stable pump current is the reference pump current. When the pump is running, it will be delayed for a certain period of time to ensure that the pump current signal and its filter value have reached a stable state. The maximum and minimum values ​​of the pump current in the reference stage will be calculated. When the difference between the maximum and minimum values ​​exceeds the threshold, it is considered that there may be water vapor condensation on the pump. When this situation is detected, the DMTL pump current fluctuation exceeds the range fault and the leakage detection is interrupted.

[0080] After introducing the implementation environment and application scenarios of the embodiments of the present application, the following describes the method for determining the environmental pressure provided by the embodiments of the present application. Figure 3 , taking the execution subject as a vehicle-mounted terminal as an example, the method includes:

[0081] 301. During leakage diagnosis of a target vehicle, the vehicle-mounted terminal obtains a first pump current difference of a DMTL pump of the target vehicle, where the first pump current difference is a difference between a maximum pump current and a minimum pump current of the DMTL pump in a first time period.

[0082] Wherein, the target vehicle is a vehicle for leak diagnosis, and the leak diagnosis can be any of the above-mentioned stages A and C. The DMTL pump is a pump used for leak diagnosis of the target vehicle, and the DMTL pump belongs to an evaporative leak diagnostic system, which is arranged between the air filter and the carbon canister of the target vehicle for leak diagnosis. The evaporative leak diagnostic system also includes a solenoid valve, which is used to control the flow direction of the gas. In the reference mode, the solenoid valve is closed and the gas passes through the 0.5mm reference hole. In the diagnostic mode, the solenoid valve is opened and the gas flows into the fuel tank through the carbon canister. The length of the first time period is set by the technician according to the actual situation, and the embodiment of the present application does not limit this. The pump current of the DMTL pump will fluctuate, and the fluctuation of the pump current is equivalent to the fluctuation of the output power of the DMTL pump. The highest pump current and the lowest pump current of the DMTL pump in the first time period are also the two extreme values ​​of the pump current fluctuation of the DMTL pump in the first time period.

[0083] 302. When the first pump current difference is greater than the first pump current difference threshold, the vehicle-mounted terminal obtains the second pump current difference of the DMTL pump of the target vehicle, and the second pump current difference is the difference between the highest pump current and the lowest pump current of the DMTL pump in a second time period, and the second time period is separated from the first time period by a first preset time length.

[0084] Among them, the first pump current difference is greater than the first pump current difference threshold, which indicates that the fluctuation amplitude of the pump current of the DMTL pump in the first time period is large, and the reliability of leakage diagnosis may be reduced. In order to prevent misjudgment and improve the efficiency of leakage diagnosis, the second pump current difference of the DMTL pump is obtained, and the second pump current difference can indicate the fluctuation of the pump current of the DMTL pump in the second time period. The second time period is separated from the first time period by a first preset time length, and the first preset time length is set by the technician according to the actual situation, and the embodiment of the present application does not limit this.

[0085] 303. When the second pump current difference is less than or equal to the second pump current difference threshold, the vehicle-mounted terminal determines that the pump current fluctuation of the DMTL pump is normal.

[0086] Among them, the second pump current difference is less than or equal to the second pump current difference threshold, which means that the fluctuation amplitude of the pump current of the DMTL pump in the second time period is small, the pump current fluctuation is normal, leakage diagnosis can be performed normally, and the reliability of leakage diagnosis is high.

[0087] Through the technical solution provided by the embodiment of the present application, during the process of leakage diagnosis, the first pump current difference of the DMTL pump of the target vehicle is obtained, and the first pump current difference is the difference between the highest pump current and the lowest pump current of the DMTL pump in the first time period. In the case where the first pump current difference is greater than the first pump current difference threshold, the second pump current difference of the DMTL pump of the target vehicle is obtained, and the second pump current difference is the difference between the highest pump current and the lowest pump current of the DMTL pump in the second time period. In the case where the second pump current difference is less than or equal to the second pump current difference threshold, it is determined that there is no abnormality in the pump current fluctuation of the DMTL pump, and leakage diagnosis can continue, avoiding the influence of excessive pump current fluctuation on the reliability of leakage diagnosis.

[0088] The above steps 301-303 are a brief description of the method for detecting abnormal pump current of the DMTL pump provided in the embodiment of the present application. The following will describe in detail the method for detecting abnormal pump current of the DMTL pump provided in the embodiment of the present application in combination with some examples. Figure 4 , methods include:

[0089] 401. During leakage diagnosis of a target vehicle, the vehicle-mounted terminal obtains a first pump current difference of a DMTL pump of the target vehicle, where the first pump current difference is a difference between a maximum pump current and a minimum pump current of the DMTL pump in a first time period.

[0090] Wherein, the target vehicle is a vehicle for leak diagnosis, and the leak diagnosis can be any of the above-mentioned stages A and C. The DMTL pump is a pump used for leak diagnosis of the target vehicle, and the DMTL pump belongs to an evaporative leak diagnostic system, which is arranged between the air filter and the carbon canister of the target vehicle for leak diagnosis. The evaporative leak diagnostic system also includes a solenoid valve, which is used to control the flow direction of the gas. In the reference mode, the solenoid valve is closed and the gas passes through the 0.5mm reference hole. In the diagnostic mode, the solenoid valve is opened and the gas flows into the fuel tank through the carbon canister. The length of the first time period is set by the technician according to the actual situation, and the embodiment of the present application does not limit this. The pump current of the DMTL pump will fluctuate, and the fluctuation of the pump current is equivalent to the fluctuation of the output power of the DMTL pump. The highest pump current and the lowest pump current of the DMTL pump in the first time period are also the two extreme values ​​of the pump current fluctuation of the DMTL pump in the first time period.

[0091] In a possible implementation, during the process of leak diagnosis of the target vehicle, the vehicle terminal controls the solenoid valve to close and starts the DMTL pump to pump air into the reference hole of the DMTL pump. When the reference pump current of the DMTL pump is obtained, the vehicle terminal obtains the first pump current difference of the DMTL pump of the target vehicle.

[0092] Wherein, the solenoid valve is a solenoid valve in an evaporative leak diagnostic system, used to control the flow direction of gas. Controlling the solenoid valve to close is to control entering a reference mode, which corresponds to the above-mentioned stage A, so as to calculate a reference current. The reference hole is a 0.5 mm reference hole in the evaporative leak diagnostic system. The reference pump current is the pump current measured under the reference mode. In some embodiments, the duration of the reference mode is the duration of the first time period, such as 10 seconds.

[0093] In this embodiment, during the leakage diagnosis process, the solenoid valve can be controlled to close and the DMTL pump can be started, and the stability of the pump current of the DMTL pump can be evaluated in the reference mode.

[0094] For example, during the process of leak diagnosis of the target vehicle, the vehicle terminal controls the solenoid valve to close and start the DMTL pump to pump air into the reference hole of the DMTL pump. When the reference pump current of the DMTL pump is obtained, the vehicle terminal starts to continuously obtain the pump current of the DMTL pump in the first time period after a second preset time interval. The vehicle terminal subtracts the highest pump current and the lowest pump current of the DMTL pump in the first time period to obtain the first pump current difference.

[0095] In a possible implementation, during the process of leak diagnosis on the target vehicle, the vehicle terminal determines whether the target vehicle meets the diagnosis condition. If the target vehicle meets the diagnosis condition, the vehicle terminal obtains the first pump current difference of the DMTL pump of the target vehicle.

[0096] Among them, the diagnostic conditions are set by technicians according to actual conditions, and the embodiments of the present application do not limit this.

[0097] In this implementation, before obtaining the first pump current difference, it is first determined whether the target vehicle meets the diagnostic condition. If the target vehicle meets the diagnostic condition, the first pump current difference is obtained to avoid wasting computing resources.

[0098] For example, in the process of leak diagnosis of the target vehicle, the vehicle terminal determines whether the target vehicle meets the diagnostic condition. If the target vehicle meets the diagnostic condition, the vehicle terminal starts to continuously obtain the pump current of the DMTL pump in the first time period after a second preset time interval. The vehicle terminal subtracts the highest pump current and the lowest pump current of the pump current of the DMTL pump in the first time period to obtain the first pump current difference.

[0099] The following is an explanation of the process by which the vehicle-mounted terminal determines whether the target vehicle meets the diagnostic conditions.

[0100] In a possible implementation, the vehicle terminal obtains a vehicle parameter of the target vehicle, where the vehicle parameter is a parameter related to leakage diagnosis, and determines whether the target vehicle meets the diagnosis condition based on the vehicle parameter.

[0101] In order to explain the above implementation more clearly, the above implementation will be explained through two examples below.

[0102] Example 1: The vehicle terminal obtains the vehicle parameters of the target vehicle, which are parameters related to leakage diagnosis. The vehicle terminal compares the vehicle parameters with multiple sub-diagnostic conditions under the diagnostic condition. If the vehicle parameters match the multiple sub-diagnostic conditions, the vehicle terminal determines that the target vehicle meets the diagnostic condition. If the vehicle parameters do not match any of the multiple sub-diagnostic conditions, the vehicle terminal determines that the target vehicle meets the diagnostic condition.

[0103] Example 2: The vehicle terminal obtains the vehicle parameters of the target vehicle, which are parameters related to leakage diagnosis. The vehicle terminal inputs the vehicle parameters into the diagnostic condition discrimination model, processes the vehicle parameters through the diagnostic condition discrimination model, and obtains the diagnostic condition matching value of the vehicle parameters. When the diagnostic condition matching value is greater than or equal to the matching value threshold, the vehicle terminal determines that the target vehicle meets the diagnostic condition. When the diagnostic condition matching value is less than the matching value threshold, the vehicle terminal determines that the target vehicle does not meet the diagnostic condition. Among them, the matching value threshold is set by the technician according to the actual situation, and the embodiment of the present application does not limit this.

[0104] 402. When the first pump current difference is greater than the first pump current difference threshold, the vehicle-mounted terminal obtains the second pump current difference of the DMTL pump of the target vehicle, and the second pump current difference is the difference between the highest pump current and the lowest pump current of the DMTL pump in a second time period, and the second time period is separated from the first time period by a first preset time length.

[0105] Among them, the first pump current difference is greater than the first pump current difference threshold, which means that the fluctuation amplitude of the pump current of the DMTL pump in the first time period is large, and there may be a decrease in the reliability of leakage diagnosis, that is, there is a suspected fault. In order to prevent misjudgment and improve the efficiency of leakage diagnosis, the second pump current difference of the DMTL pump is obtained, and the second pump current difference can represent the fluctuation of the pump current of the DMTL pump in the second time period. The second time period is separated from the first time period by a first preset time length, and the first preset time length is set by the technician according to the actual situation, and the embodiment of the present application does not limit this.

[0106] In a possible implementation, when the first pump current difference is greater than the first pump current difference threshold, the vehicle terminal starts to continuously obtain the pump current of the DMTL pump in the second time period after the first preset time period. The vehicle terminal subtracts the highest pump current and the lowest pump current of the pump current of the DMTL pump in the second time period to obtain the second pump current difference.

[0107] The second pump current difference is obtained after the first preset time interval in order to avoid false alarms and to allow the DMTL pump to eliminate some interferences by itself when rotating.

[0108] Under this implementation, when it is determined that the first pump current difference is greater than the first pump current difference threshold, the pump current of the DMTL pump in the second time period can be continuously obtained after a first preset time interval, and the second pump current difference can be determined based on the pump current in the second time period.

[0109] For example, when the first pump current difference is greater than the first pump current difference threshold, the vehicle terminal adjusts the first pump current difference to 0. The vehicle terminal starts to continuously obtain the pump current of the DMTL pump in the second time period after the first preset time period. The vehicle terminal subtracts the highest pump current and the lowest pump current of the pump current of the DMTL pump in the second time period to obtain the second pump current difference.

[0110] After the above step 401, the vehicle terminal can perform the following steps in addition to the above step 402.

[0111] In a possible implementation manner, when the first pump current difference is less than or equal to the first pump current difference threshold, the vehicle-mounted terminal determines that the pump current fluctuation of the DMTL pump is normal.

[0112] Among them, the first pump current difference is less than or equal to the first pump current difference threshold, which means that the fluctuation amplitude of the pump current of the DMTL pump in the first time period is small, the pump current fluctuation is normal, leakage diagnosis can be performed normally, and the reliability of leakage diagnosis is high.

[0113] 403. When the second pump current difference is less than or equal to the second pump current difference threshold, the vehicle terminal determines that the pump current fluctuation of the DMTL pump is normal.

[0114] Among them, the second pump current difference is less than or equal to the second pump current difference threshold, which means that the fluctuation amplitude of the pump current of the DMTL pump in the second time period is small, the pump current fluctuation is normal, leakage diagnosis can be performed normally, and the reliability of leakage diagnosis is high.

[0115] After the above step 402, the vehicle terminal can perform the following steps in addition to the above step 403.

[0116] In a possible implementation manner, when the second pump current difference is greater than a second pump current difference threshold, the vehicle-mounted terminal determines that there is an abnormality in the pump current fluctuation of the DMTL pump.

[0117] In some embodiments, when the pump current fluctuation of the DMTL pump is abnormal, the vehicle terminal triggers an alarm prompt, and the alarm prompt is used to prompt that the pump current fluctuation of the DMTL pump is abnormal. For example, the vehicle terminal displays a prompt text corresponding to the alarm prompt, or the vehicle terminal plays a prompt audio corresponding to the alarm prompt.

[0118] In some embodiments, when there is an abnormality in the pump current fluctuation of the DMTL pump, the vehicle terminal terminates the leakage diagnosis process for the target vehicle.

[0119] Under this implementation, when there is an abnormal pump current fluctuation of the DMTL pump, the leakage diagnosis process can be terminated directly, thereby avoiding obtaining a leakage diagnosis result with low reliability, and prompting the user to perform leakage diagnosis after eliminating the fault of the DMTL pump, thereby obtaining a leakage diagnosis result with high reliability.

[0120] The following will be combined Figure 5 The technical solution provided in the embodiments of the present application is described.

[0121] See also Figure 5 , when the diagnostic conditions are met, the vehicle enters the post-operation phase. In the post-operation phase, the DMTL pump starts to run, the solenoid valve is closed, and the reference pump current is calculated. After the delay time t1, a quick diagnosis of the DMTL pump current fluctuation exceeding the range will be performed in the first time period. After the time t2, if the difference between the maximum and minimum pump currents deltaI is less than or equal to the first pump current difference threshold, the diagnosis is completed and it is determined to be fault-free. The leakage diagnosis of the evaporative leakage diagnosis system will continue in the future. When deltaI is greater than the first pump current difference threshold, it is a suspected fault. After the suspected fault is detected, deltaI is restored to 0, and after a delay time, the reference phase lasts for t3 (second time period), t3 = 130s-t1-t2-t4. During the reference phase lasting t3, the pump current is determined again, and deltaI is updated within the calibration amount t4. When it is less than or equal to the second pump current difference threshold, the diagnosis is completed without fault; otherwise, a fault is reported.

[0122] See also Figure 6 , the vehicle terminal detects that the DMTL current fluctuation is too large within the time t2, and will continue for t3 to make the pump current relatively stable. After stabilization, the pump current fluctuation rationality fault detection will be performed again in the t4 time period. If the pump current fluctuation is detected within the first pump current difference threshold value in the t2 time period, the DMTL pump current fluctuation out-of-range diagnosis is completed, and the reference stage will be exited to continue the subsequent leakage diagnosis.

[0123] Through the technical solution provided by the embodiment of the present application, during the process of leakage diagnosis, the first pump current difference of the DMTL pump of the target vehicle is obtained, and the first pump current difference is the difference between the highest pump current and the lowest pump current of the DMTL pump in the first time period. In the case where the first pump current difference is greater than the first pump current difference threshold, the second pump current difference of the DMTL pump of the target vehicle is obtained, and the second pump current difference is the difference between the highest pump current and the lowest pump current of the DMTL pump in the second time period. In the case where the second pump current difference is less than or equal to the second pump current difference threshold, it is determined that there is no abnormality in the pump current fluctuation of the DMTL pump, and leakage diagnosis can continue, avoiding the influence of excessive pump current fluctuation on the reliability of leakage diagnosis.

[0124] Corresponding to the above method embodiment, see Figure 7 The embodiment of the present application further provides a pump current abnormality detection device 700 of a DMTL pump, comprising: a first pump current difference acquisition module 701 , a second pump current difference acquisition module 702 and an abnormality determination module 703 .

[0125] The first pump current difference acquisition module 701 is used to acquire a first pump current difference of a DMTL pump of the target vehicle during leakage diagnosis of the target vehicle. The first pump current difference is the difference between the highest pump current and the lowest pump current of the DMTL pump in a first time period.

[0126] The second pump current difference acquisition module 702 is used to obtain the second pump current difference of the DMTL pump of the target vehicle when the first pump current difference is greater than the first pump current difference threshold. The second pump current difference is the difference between the highest pump current and the lowest pump current of the DMTL pump in a second time period. The second time period is separated from the first time period by a first preset time length.

[0127] The abnormality determination module 703 is configured to determine that the pump current fluctuation of the DMTL pump is normal when the second pump current difference is less than or equal to a second pump current difference threshold.

[0128] In a possible implementation, the first pump current difference acquisition module 701 is used to control the solenoid valve to close and start the DMTL pump to pump air into the reference hole of the DMTL pump during the process of leak diagnosis of the target vehicle. When the reference pump current of the DMTL pump is obtained, the first pump current difference of the DMTL pump of the target vehicle is obtained.

[0129] In a possible implementation, the first pump current difference acquisition module 701 is used to, when the reference pump current of the DMTL pump is acquired, start to continuously acquire the pump current of the DMTL pump in the first time period after a second preset time interval, and subtract the highest pump current and the lowest pump current of the pump current of the DMTL pump in the first time period to obtain the first pump current difference.

[0130] In a possible implementation, the first pump current difference acquisition module 701 is used to determine whether the target vehicle meets the diagnosis condition during the process of leak diagnosis of the target vehicle. If the target vehicle meets the diagnosis condition, the first pump current difference of the DMTL pump of the target vehicle is acquired.

[0131] In a possible implementation, the second pump current difference acquisition module 702 is used to, when the first pump current difference is greater than the first pump current difference threshold, start to continuously acquire the pump current of the DMTL pump in the second time period after the first preset time period. The highest pump current and the lowest pump current of the pump current of the DMTL pump in the second time period are subtracted to obtain the second pump current difference.

[0132] In a possible implementation manner, the abnormality determination module 703 is further configured to determine that there is an abnormality in the pump current fluctuation of the DMTL pump when the second pump current difference is greater than a second pump current difference threshold.

[0133] In a possible implementation, the device further includes:

[0134] The termination module is used to terminate the leakage diagnosis process of the target vehicle.

[0135] In a possible implementation manner, the abnormality determination module 703 is further configured to determine that the pump current fluctuation of the DMTL pump is normal when the first pump current difference is less than or equal to the first pump current difference threshold.

[0136] Through the technical solution provided by the embodiment of the present application, during the process of leakage diagnosis, the first pump current difference of the DMTL pump of the target vehicle is obtained, and the first pump current difference is the difference between the highest pump current and the lowest pump current of the DMTL pump in the first time period. In the case where the first pump current difference is greater than the first pump current difference threshold, the second pump current difference of the DMTL pump of the target vehicle is obtained, and the second pump current difference is the difference between the highest pump current and the lowest pump current of the DMTL pump in the second time period. In the case where the second pump current difference is less than or equal to the second pump current difference threshold, it is determined that there is no abnormality in the pump current fluctuation of the DMTL pump, and leakage diagnosis can continue, avoiding the influence of excessive pump current fluctuation on the reliability of leakage diagnosis.

[0137] See also Figure 8 The embodiment of the present application further provides a vehicle-mounted terminal 800, which includes:

[0138] at least one processor; and,

[0139] a memory communicatively connected to the at least one processor; wherein,

[0140] The memory stores instructions that may be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the method for detecting pump current abnormality of the DMTL pump in the aforementioned method embodiment.

[0141] An embodiment of the present application further provides a non-transitory computer-readable storage medium, which stores computer instructions, and the computer instructions are used to enable the computer to execute the method for detecting pump current abnormality of the DMTL pump in the aforementioned method embodiment.

[0142] An embodiment of the present application also provides a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium, and the computer program includes program instructions. When the program instructions are executed by a computer, the computer executes the method for detecting pump current abnormality of the DMTL pump in the aforementioned method embodiment.

[0143] Reference below Figure 8 , which shows a schematic diagram of the structure of a vehicle-mounted terminal 800 suitable for implementing the embodiment of the present application. The vehicle-mounted terminal 800 in the embodiment of the present application may include but is not limited to mobile vehicle-mounted terminals such as notebook computers, digital broadcast receivers, PDAs (personal digital assistants), PADs (tablet computers), PMPs (portable multimedia players), etc., and fixed vehicle-mounted terminals such as digital TVs, desktop computers, etc. Figure 8 The vehicle-mounted terminal 800 shown is merely an example and should not bring any limitation to the functions and scope of application of the embodiments of the present application.

[0144] like Figure 8 As shown, the vehicle terminal 800 may include a processing device (e.g., a central processing unit, a graphics processing unit, etc.) 801, which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 802 or a program loaded from a storage device 808 to a random access memory (RAM) 803. In the RAM 803, various programs and data required for the operation of the vehicle terminal 800 are also stored. The processing device 801, the ROM 802, and the RAM 803 are connected to each other via a bus 804. An input / output (I / O) interface 805 is also connected to the bus 804.

[0145] Typically, the following devices may be connected to the I / O interface 805: input devices 806 including, for example, a touch screen, a touchpad, a keyboard, a mouse, an image sensor, a microphone, an accelerometer, a gyroscope, etc.; output devices 807 including, for example, a liquid crystal display (LCD), a speaker, a vibrator, etc.; storage devices 808 including, for example, a magnetic tape, a hard disk, etc.; and communication devices 809. The communication device 809 may allow the vehicle-mounted terminal 800 to communicate with other devices wirelessly or by wire to exchange data. Although the vehicle-mounted terminal 800 having various devices is shown in the figure, it should be understood that it is not required to implement or have all the devices shown. More or fewer devices may be implemented or have alternatively.

[0146] In particular, according to an embodiment of the present disclosure, the process described above with reference to the flowchart can be implemented as a computer software program. For example, an embodiment of the present disclosure includes a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program includes a program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network through a communication device 809, or installed from a storage device 808, or installed from a ROM 802. When the computer program is executed by the processing device 801, the above-mentioned functions defined in the method of the embodiment of the present application are executed.

[0147] It should be noted that the computer-readable medium mentioned above in the present disclosure may be a computer-readable signal medium or a computer-readable storage medium or any combination of the above two. The computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared or semiconductor system, device or device, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present disclosure, a computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in combination with an instruction execution system, device or device. In the present disclosure, a computer-readable signal medium may include a data signal propagated in a baseband or as part of a carrier wave, which carries a computer-readable program code. This propagated data signal may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. The computer readable signal medium may also be any computer readable medium other than a computer readable storage medium, which may send, propagate or transmit a program for use by or in conjunction with an instruction execution system, apparatus or device. The program code contained on the computer readable medium may be transmitted using any suitable medium, including but not limited to: wires, optical cables, RF (radio frequency), etc., or any suitable combination of the above.

[0148] The computer-readable medium may be included in the vehicle-mounted terminal; or may exist independently without being installed in the vehicle-mounted terminal.

[0149] The above-mentioned computer-readable medium carries one or more programs. When the above-mentioned one or more programs are executed by the vehicle-mounted terminal, the vehicle-mounted terminal: obtains at least two Internet Protocol addresses; sends a node evaluation request including the at least two Internet Protocol addresses to a node evaluation device, wherein the node evaluation device selects an Internet Protocol address from the at least two Internet Protocol addresses and returns it; receives the Internet Protocol address returned by the node evaluation device; wherein the obtained Internet Protocol address indicates an edge node in a content distribution network.

[0150] Alternatively, the computer-readable medium carries one or more programs, and when the one or more programs are executed by the vehicle-mounted terminal, the vehicle-mounted terminal: receives a node evaluation request including at least two Internet Protocol addresses; selects an Internet Protocol address from the at least two Internet Protocol addresses; and returns the selected Internet Protocol address; wherein the received Internet Protocol address indicates an edge node in a content distribution network.

[0151] Computer program code for performing the operations of the present disclosure may be written in one or more programming languages, or a combination thereof, including object-oriented programming languages, such as Java, Smalltalk, C++, and conventional procedural programming languages, such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., through the Internet using an Internet service provider).

[0152] The flowcharts and block diagrams in the accompanying drawings illustrate the possible architecture, functions and operations of the systems, methods and computer program products according to various embodiments of the present disclosure. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of a code, and the module, the program segment or a part of the code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order than the order marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or the flowchart, and the combination of boxes in the block diagram and / or the flowchart, can be implemented with a dedicated hardware-based system that performs the specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0153] The units involved in the embodiments described in the present application may be implemented by software or hardware. The name of the unit does not limit the unit itself in some cases. For example, the first acquisition unit may also be described as a "unit for acquiring at least two Internet Protocol addresses".

Claims

1. A method for detecting abnormal pump current of a DMTL pump, characterized in that: include: In a process of performing leakage diagnosis on a target vehicle, obtaining a first pump current difference value of a DMTL pump of the target vehicle, wherein the first pump current difference value is a difference between a highest pump current and a lowest pump current of the DMTL pump in a first time period; When the first pump current difference is greater than a first pump current difference threshold, obtaining a second pump current difference of the DMTL pump of the target vehicle, wherein the second pump current difference is a difference between a highest pump current and a lowest pump current of the DMTL pump in a second time period, and the second time period is separated from the first time period by a first preset time length; When the second pump current difference is less than or equal to a second pump current difference threshold, it is determined that the pump current fluctuation of the DMTL pump is normal.

2. The method for detecting abnormal pump current of a DMTL pump according to claim 1, characterized in that: In the process of performing leakage diagnosis on the target vehicle, obtaining the first pump current difference of the DMTL pump of the target vehicle includes: During the leak diagnosis of the target vehicle, the solenoid valve is controlled to close and the DMTL pump is started to pump air into the reference hole of the DMTL pump; When the reference pump current of the DMTL pump is obtained, a first pump current difference of the DMTL pump of the target vehicle is obtained.

3. The method for detecting abnormal pump current of a DMTL pump according to claim 2, characterized in that: The step of obtaining a first pump current difference of the DMTL pump of the target vehicle when a reference pump current of the DMTL pump is obtained, wherein the reference pump current is a stable pump current, comprises: When the reference pump current of the DMTL pump is obtained, starting to continuously obtain the pump current of the DMTL pump in the first time period after a second preset time interval; The first pump current difference is obtained by subtracting the highest pump current and the lowest pump current of the DMTL pump in the first time period.

4. The method for detecting abnormal pump current of a DMTL pump according to claim 1, characterized in that: In the process of performing leakage diagnosis on the target vehicle, obtaining the first pump current difference of the DMTL pump of the target vehicle includes: During the process of leak diagnosis on the target vehicle, determining whether the target vehicle meets the diagnosis condition; In a case where the target vehicle satisfies the diagnostic condition, a first pump current difference of a DMTL pump of the target vehicle is acquired.

5. The method for detecting abnormal pump current of a DMTL pump according to claim 1, characterized in that: When the first pump current difference is greater than a first pump current difference threshold, obtaining a second pump current difference of the DMTL pump of the target vehicle includes: When the first pump current difference is greater than a first pump current difference threshold, starting to continuously acquire the pump current of the DMTL pump in the second time period after the first preset time interval; The highest pump current and the lowest pump current of the DMTL pump in the second time period are subtracted from each other to obtain the second pump current difference.

6. The method for detecting abnormal pump current of a DMTL pump according to claim 1, characterized in that: After acquiring the second pump current difference of the DMTL pump of the target vehicle when the first pump current difference is greater than the first pump current difference threshold, the method further includes: When the second pump current difference is greater than a second pump current difference threshold, it is determined that there is an abnormality in the pump current fluctuation of the DMTL pump.

7. The method for detecting abnormal pump current of a DMTL pump according to claim 6, characterized in that: After determining that the pump current fluctuation of the DMTL pump is abnormal when the second pump current difference is greater than a second pump current difference threshold, the method further includes: The leak diagnosis process for the target vehicle is terminated.

8. The method for detecting abnormal pump current of a DMTL pump according to claim 1, characterized in that: In the process of performing leakage diagnosis on the target vehicle, after obtaining the first pump current difference of the DMTL pump of the target vehicle, the method further includes: When the first pump current difference is less than or equal to the first pump current difference threshold, it is determined that the pump current fluctuation of the DMTL pump is normal.

9. A device for detecting abnormal pump current of a DMTL pump, characterized in that: include: A first pump current difference acquisition module, used for acquiring a first pump current difference of a DMTL pump of the target vehicle during leakage diagnosis of the target vehicle, wherein the first pump current difference is a difference between a maximum pump current and a minimum pump current of the DMTL pump in a first time period; A second pump current difference acquisition module, configured to acquire a second pump current difference of the DMTL pump of the target vehicle when the first pump current difference is greater than a first pump current difference threshold, wherein the second pump current difference is a difference between a maximum pump current and a minimum pump current of the DMTL pump in a second time period, and the second time period is separated from the first time period by a first preset time length; The abnormality determination module is used to determine that the pump current fluctuation of the DMTL pump is normal when the second pump current difference is less than or equal to a second pump current difference threshold.

10. A vehicle-mounted terminal, characterized in that: The vehicle-mounted terminal comprises: at least one processor; and, a memory communicatively connected to the at least one processor; wherein, The memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can perform the method for detecting pump current abnormality of a DMTL pump according to any one of claims 1 to 8.

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