Vehicle oil pump status diagnosis method, system and storage medium, vehicle

Abstract

The present invention discloses a method, system, storage medium, and vehicle for diagnosing the oil pump state of a vehicle. The method comprises: determining that the initial working mode of the oil pump is the running mode; obtaining the working current of the oil pump and the ambient temperature of the environment in which the oil pump is located; and diagnosing the working state of the oil pump according to the working current and the ambient temperature. The method diagnoses the working state of the oil pump according to the working current of the oil pump and the ambient temperature of the environment in which the oil pump is located, thereby improving the accuracy of the diagnosis of the working state of the oil pump.

Description

Technical Field

[0001] The present invention relates to the technical field of oil pumps, and in particular to a method, system, storage medium, and vehicle for diagnosing the state of an oil pump of a vehicle. Background Art

[0002] As people pay more and more attention to energy security and environmental protection, countries have formulated increasingly stringent emission and energy consumption regulations. In order to meet the emission and energy consumption requirements, major OEMs have formulated a timetable for the delisting of traditional fuel vehicles. As an energy-saving vehicle, hybrid vehicles will have a large growth in the future.

[0003] For hybrid vehicles, especially plug-in hybrid vehicles or extended-range hybrid vehicles, customers may not pay much attention to the remaining fuel in the fuel tank during short-distance driving. When the fuel in the fuel tank is used up in the HEV (Hybrid Electric Vehicle) mode, if the fuel pump does not have a certain control strategy, the fuel pump may run dry (also known as idling), which can easily lead to fuel pump ablation. If the hybrid vehicle has a motor that reverses the engine in the operating mode, the probability of the fuel pump running dry is higher, which requires the hybrid vehicle to effectively monitor the dry running conditions of the fuel pump to avoid fuel pump ablation.

[0004] In the related technology, the commonly used method is to monitor the speed of the oil pump or calculate the speed of the oil pump through some related parameters, and then compare the actual speed with the standard speed to confirm whether the oil pump is in an idling state. If the speed of the oil pump needs to be monitored, hardware such as Hall sensors will be added, and the system cost will increase; if it is calculated through related parameters, the calculation results are prone to misjudgment due to the large fluctuations of parameters under different conditions and the amplified deviation caused by the calculation. Summary of the invention

[0005] The present invention aims to solve one of the technical problems in the related art to at least a certain extent. To this end, one object of the present invention is to provide a method for diagnosing the state of an oil pump of a vehicle, diagnosing the working state of the oil pump according to the working current of the oil pump and the ambient temperature of the environment in which the oil pump is located, and improving the accuracy of the diagnosis of the working state of the oil pump.

[0006] A second object of the present invention is to provide a computer-readable storage medium.

[0007] A third object of the present invention is to provide a vehicle oil pump status diagnostic system.

[0008] A fourth object of the present invention is to provide a vehicle.

[0009] To achieve the above-mentioned purpose, an embodiment of the first aspect of the present invention proposes a method for diagnosing the oil pump status of a vehicle, the method comprising: determining that the initial working mode of the oil pump is the operating mode; obtaining the working current of the oil pump and the ambient temperature of the environment in which the oil pump is located; and diagnosing the working status of the oil pump based on the working current and the ambient temperature.

[0010] According to the vehicle oil pump status diagnosis method of the embodiment of the present invention, the working status of the oil pump is diagnosed according to the working current of the oil pump and the ambient temperature of the environment in which the oil pump is located, thereby improving the accuracy of the diagnosis of the working status of the oil pump.

[0011] In addition, the vehicle oil pump status diagnosis method proposed in the above embodiment of the present invention may also have the following additional technical features:

[0012] According to an embodiment of the present invention, before determining that the initial working mode of the oil pump is the running mode, the method further includes: acquiring an engine state of the vehicle; and selecting the initial working mode of the oil pump according to the engine state.

[0013] According to one embodiment of the present invention, selecting the initial working mode of the oil pump according to the engine state includes: if the engine is in an unstarted state, selecting the initial working mode of the oil pump as a non-operating mode; if the engine is in an operating state, selecting the initial working mode of the oil pump as an operating mode; if the engine is in a non-first start state, selecting the initial working mode of the oil pump as a starting mode; if the engine is in a first start state, selecting the initial working mode of the oil pump as a factory mode.

[0014] According to one embodiment of the present invention, the operating state of the oil pump is diagnosed based on the operating current and the ambient temperature, including: determining a first threshold value and a second threshold value based on the ambient temperature, wherein the first threshold value is less than the second threshold value; comparing the operating current with the first threshold value and the second threshold value, respectively; if the operating current is greater than the second threshold value, determining that the oil pump is in an oil stall state; if the operating current is greater than or equal to the first threshold value and less than or equal to the second threshold value, determining that the oil pump is in an operating state; if the operating current is less than the first threshold value and lasts for a first preset time, obtaining the oil tank level corresponding to the oil pump, and diagnosing the operating state of the oil pump based on the oil tank level.

[0015] According to one embodiment of the present invention, determining the first threshold and the second threshold according to the ambient temperature includes: acquiring the identity information of the oil pump, and determining the durability time of the oil pump according to the identity information; determining a first change interval according to the ambient temperature, and determining a second change interval according to the durability time; taking the maximum value between the first change interval and the second change interval as the second threshold, and taking the minimum value between the first change interval and the second change interval as the first threshold.

[0016] According to one embodiment of the present invention, diagnosing the working state of the oil pump according to the oil tank liquid level includes: comparing the oil tank liquid level with a preset dry-running warning liquid level; if the oil tank liquid level is greater than or equal to the preset dry-running warning liquid level, determining that the oil pump is in a limp state; if the oil tank liquid level is less than the preset dry-running warning liquid level, determining that the oil pump is in a dry-running state.

[0017] According to one embodiment of the present invention, after determining that the initial working mode of the oil pump is the operating mode, the method further includes: obtaining the oil pressure of the oil pump and comparing the oil pressure with a preset oil pressure threshold; if the oil pressure is greater than the preset oil pressure threshold, determining that the oil pump is in a normal operating state; if the oil pressure is less than the preset oil pressure threshold, executing the step of diagnosing the working state of the oil pump based on the working current and the ambient temperature.

[0018] According to one embodiment of the present invention, the method further includes: after selecting the initial working mode of the oil pump as a non-operating mode, stopping diagnosing the working state of the oil pump; after selecting the initial working mode of the oil pump as a starting mode, determining a starting number limit and a first starting judgment time, and controlling the start of the oil pump according to the starting number limit and the first starting judgment time; after selecting the initial working mode of the oil pump as a factory mode, determining a second starting judgment time, and controlling the start of the oil pump according to the second starting judgment time, wherein the first starting judgment time is less than the second starting judgment time.

[0019] According to one embodiment of the present invention, controlling the start of the oil pump according to the start number limit and the first start determination time includes: counting the number of starts of the oil pump when it is started with the first start determination time; comparing the number of starts with the start number limit; if the number of starts reaches the start number limit and the engine still does not start normally, obtaining the oil tank level corresponding to the oil pump; if the oil tank level is less than a preset dry-running warning level, determining that the oil pump is in a dry-running state.

[0020] According to one embodiment of the present invention, after determining that the initial working mode of the oil pump is the operating mode, the method further includes: determining the required voltage of the oil pump according to the operating mode; judging to perform oil pump circuit detection according to the required voltage and the operating current; wherein, when both the required voltage and the operating current are not 0, executing the step of diagnosing the working state of the oil pump.

[0021] According to one embodiment of the present invention, the method further includes: after determining that the oil pump is in an oil jam state, performing oil jam protection on the oil pump; after determining that the oil pump is in a dry running state, performing dry running protection on the oil pump; after determining that the oil pump is in a limp state, controlling the oil pump to enter a limp mode.

[0022] According to one embodiment of the present invention, after determining that the oil pump is in a dry-run protection state, the method further includes: stopping responding to work requirements for the oil pump, and displaying prompt information through an instrument panel of the vehicle to provide a refueling reminder.

[0023] To achieve the above objectives, a second embodiment of the present invention proposes a computer-readable storage medium, and when the computer program is executed by a processor, the vehicle oil pump status diagnosis method proposed in the first embodiment of the present invention is implemented.

[0024] To achieve the above-mentioned purpose, the third aspect of the present invention proposes a vehicle oil pump status diagnostic system, characterized in that the system includes: an oil pump; a temperature sensor for detecting the ambient temperature of the environment in which the oil pump is located; an electronic control unit for forwarding the ambient temperature to a domain controller or an oil pump controller; the domain controller or the oil pump controller is used to detect the working current of the oil pump, and when it is determined that the initial working mode of the oil pump is the operating mode, diagnose the working status of the oil pump according to the working current and the ambient temperature.

[0025] To achieve the above-mentioned purpose, a fourth aspect of the present invention provides a vehicle, characterized in that it includes the vehicle oil pump status diagnostic system as provided in the third aspect of the present invention.

[0026] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a flow chart of a method for diagnosing a fuel pump status of a vehicle according to an embodiment of the present invention;

[0028] Figure 2 is a schematic diagram of the working mode of an oil pump according to a specific embodiment of the present invention;

[0029] Figure 3 is a schematic diagram of the relationship between the engine state and the working mode of the oil pump according to a specific embodiment of the present invention;

[0030] Figure 4 is a flow chart of diagnosing the state of a vehicle's oil pump according to the ambient temperature when the oil pump is in a running mode according to an embodiment of the present invention;

[0031] Figure 5 is a graph showing the relationship between the ambient temperature and the operating current of the oil pump according to a specific embodiment of the present invention;

[0032] Figure 6 is a flow chart of determining a first threshold and a second threshold according to an ambient temperature and a durability time when an oil pump according to an embodiment of the present invention is in a running mode;

[0033] Figure 7 is a graph showing the relationship between the oil pump endurance time and the operating current according to a specific embodiment of the present invention;

[0034] Figure 8 is a flow chart of diagnosing the state of a vehicle's oil pump according to the oil tank liquid level when the oil pump is in an operating mode according to an embodiment of the present invention;

[0035] Fig. 9 is a flow chart of diagnosing the oil pump status of a vehicle according to the oil pressure when the oil pump is in the running mode according to an embodiment of the present invention;

[0036] Fig.10 It is a structural schematic diagram of a vehicle oil pump status diagnosis system according to an embodiment of the present invention;

[0037] Fig.11 It is a structural schematic diagram of a vehicle oil pump status diagnosis system according to a specific embodiment of the present invention;

[0038] Fig.12 is a structural schematic diagram of a vehicle oil pump status diagnosis system according to another specific embodiment of the present invention;

[0039] Fig.13 is a structural schematic diagram of a vehicle oil pump status diagnosis system according to another specific embodiment of the present invention;

[0040] Fig.14 is a diagnostic flow chart of a vehicle oil pump status diagnostic system according to a specific embodiment of the present invention;

[0041] Fig.15 is a diagnostic flow chart of a vehicle oil pump status diagnostic system according to another specific embodiment of the present invention;

[0042] Fig.161 is a schematic structural diagram of a vehicle according to an embodiment of the present invention.

[0043] Description of labels:

[0044] 10. Engine; 20. Electronic control unit; 30. Domain controller or oil pump controller; 40. Oil pump; 50. Oil tank; 60. Temperature sensor; 70. Instrument; 100. Oil pump status diagnostic system of vehicle; 1000. Vehicle. DETAILED DESCRIPTION

[0045] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0046] The following will be combined with the instructions attached Figure 1-15 The specific implementation methods of the vehicle oil pump status diagnosis method, system and storage medium, and vehicle according to the embodiments of the present invention are described in detail.

[0047] Figure 1 FIG. 1 is a flow chart of a method for diagnosing the oil pump status of a vehicle according to an embodiment of the present invention. Figure 1 As shown, the vehicle oil pump status diagnosis method includes:

[0048] S1, determining that the initial working mode of the oil pump is the running mode.

[0049] In an embodiment of the present invention, Figure 2 As shown, the working modes of the oil pump include non-working mode, factory mode, start mode, running mode and limp mode. Among them, the start mode also includes cold start mode and hot start mode.

[0050] It should be noted that the working modes of the oil pump are not limited to the above-mentioned modes, but can be further refined according to the setting status of the oil pump. For example, in an on-demand fuel supply system, the oil pump has different operating conditions under different pressure-flow demand conditions of the engine. These operating conditions can be subdivided into multiple modes according to certain rules.

[0051] In an embodiment of the present invention, Figure 3 As shown, before determining that the initial working mode of the oil pump is the running mode, the vehicle oil pump status diagnosis method may further include: acquiring the engine status of the vehicle; and selecting the initial working mode of the oil pump according to the engine status.

[0052] In an embodiment of the present invention, the engine state of the vehicle includes an unstarted state, a running state, a non-first start state, and a first start state, wherein the first start state also includes a cold start state and a hot start state.

[0053] Specifically, the engine state is an unstarted state, that is, the engine is not working and the speed is zero. The engine state is a running state, that is, the engine is working and the speed is not zero. The engine state is a non-first start state, that is, it is not the first time to start the engine, and the engine has been run before starting. Among them, the engine state is a cold start state, that is, the engine changes from a non-working state to a running state, and the coolant temperature is less than or equal to the cold start setting temperature. The engine state is a hot start state, that is, the engine changes from a non-working state to a running state, and the coolant temperature is greater than or equal to the hot start setting temperature. The engine state is a first start state, that is, the first time the engine is started, such as before the whole vehicle is off the assembly line in the assembly workshop, the engine is started for the first time, and during the after-sales maintenance of the engine assembly, the engine fuel supply system or the fuel supply system, the fuel line or the oil pump needs to be emptied before the engine is started again.

[0054] In an embodiment of the present invention, Figure 3 As shown, according to the engine state, selecting the initial working mode of the oil pump may include: if the engine is in an unstarted state, selecting the initial working mode of the oil pump as a non-operating mode; if the engine is in an operating state, selecting the initial working mode of the oil pump as an operating mode; if the engine is in a non-first start state, selecting the initial working mode of the oil pump as a starting mode; if the engine is in a first start state, selecting the initial working mode of the oil pump as a factory mode.

[0055] Specifically, when the engine is not started and the engine speed is zero, the initial working mode of the oil pump is selected as the non-working mode. When the engine is in operation and the engine has a speed, the initial working mode of the oil pump is selected as the running mode. When the engine is not started for the first time, the initial working mode of the oil pump is selected as the starting mode. Further specifically, if the engine is in a cold start state, the initial working mode of the oil pump is selected as the cold start mode. If the engine is in a hot start state, the initial working mode of the oil pump is selected as the hot start mode. If the oil pump performance deteriorates during the operation of the engine, and the engine fuel supply pressure continues to be lower than the demand requirement, but the engine can still operate, the initial working mode of the oil pump is selected as the limp mode. If the engine is in the first start state, the initial working mode of the oil pump is selected as the factory mode.

[0056] In an embodiment of the present invention, after determining that the initial working mode of the oil pump is the operating mode, the vehicle's oil pump status diagnosis method may also include: determining the required voltage of the oil pump according to the operating mode; judging to perform oil pump circuit detection according to the required voltage and the operating current; wherein, when both the required voltage and the operating current are not 0, executing the step of diagnosing the working status of the oil pump.

[0057] Specifically, the oil pump requires different voltages in different operating modes. After determining the operating mode of the oil pump, the required voltage of the oil pump is determined according to the operating mode of the oil pump to provide the required voltage to the oil pump. When determining the required voltage of the oil pump according to the operating mode, the required voltage of the oil pump can be calculated according to the requirements of the engine and the oil pump. Or, according to the pre-stored operating mode-oil pump required voltage data table, the required voltage of the oil pump can be determined by looking up the table.

[0058] More specifically, in order to prevent the oil pump circuit from being bad and affecting the diagnosis of the working state of the oil pump, it is possible to further detect whether the oil pump circuit is normal. After providing the required voltage (a voltage that is not 0) to the oil pump, the working current of the oil pump is detected. When the working current of the oil pump is not 0, it means that the oil pump circuit is normal, and the step of diagnosing the working state of the oil pump is performed.

[0059] S2, obtaining the operating current of the oil pump and the ambient temperature of the environment in which the oil pump is located.

[0060] Specifically, when the ambient temperature is high, the viscosity of the oil decreases, the running resistance of the oil pump decreases, and the working current of the oil pump will decrease under the same input voltage condition. On the contrary, when the ambient temperature is low, the viscosity of the oil increases, the running resistance of the oil pump increases, and the working current of the oil pump will increase under the same input voltage condition. Therefore, when obtaining the working current of the oil pump, the ambient temperature of the environment in which the oil pump is located is also obtained, so as to accurately judge the working state of the oil pump based on the working current of the oil pump and the ambient temperature of the environment in which the oil pump is located.

[0061] In an embodiment of the present invention, a temperature sensor may be used to detect the ambient temperature of the environment in which the oil pump is located. The ambient temperature of the environment in which the oil pump is located is obtained from the temperature sensor. The temperature sensor may be an out-of-cabin temperature sensor on the vehicle, wherein the out-of-cabin temperature sensor is a sensor used by a system such as an in-vehicle air conditioner to detect the ambient temperature outside the vehicle. When the out-of-cabin temperature sensor is used to detect the ambient temperature of the environment in which the oil pump is located, no additional temperature sensor is needed, which can reduce the diagnostic cost.

[0062] S3, diagnose the working status of the oil pump according to the working current and ambient temperature.

[0063] In an embodiment of the present invention, Figure 4 As shown, the working status of the oil pump is diagnosed based on the working current and ambient temperature, which may include:

[0064] S31, determining a first threshold and a second threshold according to the ambient temperature, wherein the first threshold is smaller than the second threshold.

[0065] In an embodiment of the present invention, a standard table of oil pump working current at different ambient temperatures can be established based on the working current of the oil pump at different ambient temperatures. The selection of the ambient temperature range can be divided according to the working characteristics of the oil pump. It should be noted that at the same ambient temperature, when the oil pump is in different operating states, the oil temperature difference in the oil tank may also be large. For such differences, extreme working conditions need to be considered when formulating the working current standard library.

[0066] As an example, Figure 5 The figure shows the relationship between the ambient temperature and the working current of the oil pump. It should be noted that the protection scope of the present invention is not limited to the example values ​​in the figure, and the specific data can be determined according to the specific oil pump.

[0067] In the embodiment of the present invention, it is necessary to determine the standard operating current range of the oil pump under different input voltages and the operating current range of the oil pump during dry operation to ensure that there is a certain interval between the operating current of the entire vehicle and the operating current during dry operation.

[0068] Specifically, when determining the first threshold and the second threshold according to the ambient temperature, the table may be consulted to determine the temperature interval of the ambient temperature, and then the first threshold may be determined according to the first temperature of the temperature interval, and the second threshold may be determined according to the second temperature of the temperature interval, wherein the first temperature is less than the second temperature.

[0069] S32, comparing the operating current with the first threshold and the second threshold respectively.

[0070] Specifically, the operating current of the oil pump is compared with a first threshold value and a second threshold value obtained from a standard table of operating currents of oil pumps at different ambient temperatures.

[0071] S33: If the operating current is greater than the second threshold, it is determined that the oil pump is in an oil-stuck state.

[0072] S34: If the operating current is greater than or equal to the first threshold value and less than or equal to the second threshold value, it is determined that the oil pump is in the operating state.

[0073] S35: If the operating current is less than the first threshold value and lasts for a first preset time, the oil tank liquid level corresponding to the oil pump is obtained, and the operating state of the oil pump is diagnosed according to the oil tank liquid level.

[0074] Specifically, if the working current of the oil pump is greater than the second threshold value, it means that the working current of the oil pump is high, and it is determined that the oil pump is in an oil-stuck state. If the working current of the oil pump is greater than or equal to the first threshold value, and less than or equal to the second threshold value, it means that the working current of the oil pump is within the standard working current range, and it is determined that the oil pump is in a running state. If the working current of the oil pump is less than the first threshold value, it means that the working current of the oil pump is low. If the working current of the oil pump is less than the first threshold value and lasts for a first preset time, the oil tank level corresponding to the oil pump is further obtained to further diagnose the working state of the oil pump according to the oil tank level.

[0075] In an embodiment of the present invention, Figure 6 As shown, determining the first threshold and the second threshold according to the ambient temperature may include:

[0076] S41, obtaining the identity information of the oil pump, and determining the durability time of the oil pump according to the identity information;

[0077] S42, determining a first change interval according to the ambient temperature, and determining a second change interval according to the endurance time;

[0078] S43, taking the maximum value between the first change interval and the second change interval as the second threshold, and taking the minimum value between the first change interval and the second change interval as the first threshold.

[0079] In the embodiment of the present invention, the working current of the oil pump is not only affected by the ambient temperature of the environment in which the oil pump is located, but also by the durability of the oil pump. After the oil pump has been running for a long time, its working capacity will decay, which will cause the working current to rise under the same operating mode and the same required voltage input. Considering the influence of the durability of the oil pump on its working current, it is necessary to determine the normal working current range of the oil pump at different durability times according to the designed maximum life of the oil pump.

[0080] As an example, Figure 7 It should be noted that the protection scope of the present invention is not limited to the example values ​​in the figure, and the specific data can be determined according to the specific oil pump.

[0081] In an embodiment of the present invention, the influence of the ambient temperature of the environment in which the oil pump is located and the durability time of the oil pump on the operating current of the oil pump is considered. When determining the first threshold and the second threshold, the first threshold and the second threshold can be determined according to the ambient temperature and the durability time.

[0082] In an embodiment of the present invention, the identity information of the oil pump is obtained, and the durability time of the oil pump is determined based on the identity information. It should be noted that the identity information of the oil pump may include the model of the oil pump, the oil pump threshold, the oil pump durability time limit value, and the oil pump durability time, so that the durability time of the oil pump can be determined based on the identity information of the oil pump. It can be understood that the durability time of the oil pump is the working time of the oil pump.

[0083] In the embodiments of the present invention, referring to Figure 5 , determine the first change interval according to the ambient temperature, refer to Figure 7 , determine the second change interval according to the durability time, take the maximum value of the first change interval and the second change interval as the second threshold, and take the minimum value of the first change interval and the second change interval as the first threshold. In other words, take the union of the first change interval and the second change interval, and the two ends of the union are the first threshold and the second threshold respectively. For example, if the first change interval is [5,9] and the second change interval is [4,10], then the first threshold is 4 and the second threshold is 10.

[0084] More specifically, when diagnosing the working state of the oil pump, taking into account the ambient temperature of the environment in which the oil pump is located and the durability time of the oil pump, the working current of the oil pump is compared with the determined first threshold and second threshold, and the step of diagnosing the working state of the oil pump is executed.

[0085] In an embodiment of the present invention, the first preset time can be set according to the performance of the oil pump, wherein the first preset time is the time during which the oil pump continues to operate at a lower current for the first preset time without damaging the oil pump.

[0086] In an embodiment of the present invention, an oil level sensor can be used to detect the oil level in the oil tank. The oil tank level can be obtained from the oil level sensor. It should be noted that the oil level sensor is generally integrated in the oil pump assembly, but the oil level sensor is not limited to being integrated in the oil pump, that is, the oil level sensor can also be independent of the pump core part of the oil pump. When the oil pump assembly is integrated with an oil level sensor, the oil level sensor integrated in the oil pump assembly is used to detect the oil tank level, and there is no need to add an additional oil level sensor, which can reduce the diagnostic cost.

[0087] In an embodiment of the present invention, Figure 8 As shown, the working status of the oil pump is diagnosed according to the oil tank liquid level, which may include:

[0088] S351, comparing the oil tank liquid level with a preset dry-running warning liquid level;

[0089] S352, if the oil tank liquid level is greater than or equal to the preset dry-running warning liquid level, it is determined that the oil pump is in a limp state;

[0090] S353: If the oil tank liquid level is lower than the preset dry-running warning liquid level, it is determined that the oil pump is in a dry-running state.

[0091] In an embodiment of the present invention, a preset dry-running warning liquid level may be set according to the oil suction capacity of the oil pump in the actual oil tank, oil level sensor detection, and deviation of oil level fluctuation.

[0092] Specifically, the obtained oil tank liquid level is compared with the preset dry-running warning liquid level. If the oil tank liquid level is greater than or equal to the preset dry-running warning liquid level, it means that the oil level in the oil tank is greater than the dry-running warning liquid level, and the oil pump continues to have a low working current for the first preset time, which means that there is a partial failure in the oil pump performance, and the oil pump is determined to be in a limp state. If the oil tank liquid level is less than the preset dry-running warning liquid level, it means that the oil pump continues to have a low working current for the first preset time because the amount of oil in the oil tank is small, and the oil pump is determined to be in a dry-running state.

[0093] In an embodiment of the present invention, if the oil pump is in the running mode and has been running for a period of time, if it is monitored that the working current of the oil pump is lower than the first threshold value and the duration reaches the first preset time, and at the same time, the fuel tank liquid level is also lower than the preset dry-running warning liquid level, the power input to the oil pump is stopped. If under this condition, the electronic control unit still has a fuel running demand, the oil pump enters the hot start mode.

[0094] In an embodiment of the present invention, the working state of the oil pump is diagnosed using the working current of the oil pump and the ambient temperature of the environment in which the oil pump is located. In the absence of an oil pressure sensor, faults such as oil pump oil jam and dry running can be diagnosed.

[0095] In an embodiment of the present invention, Fig. 9 As shown, after determining that the initial working mode of the oil pump is the running mode, the oil pump status diagnosis method of the vehicle may further include:

[0096] S20, obtaining the oil pressure of the oil pump, and comparing the oil pressure with a preset oil pressure threshold;

[0097] S21, if the oil pressure is greater than a preset oil pressure threshold, it is determined that the oil pump is in a normal operating state;

[0098] S22, if the oil pressure is less than the preset oil pressure threshold, a step of diagnosing the working state of the oil pump according to the working current and the ambient temperature is executed.

[0099] Specifically, after determining that the initial working mode of the oil pump is the running mode, the working state of the oil pump can also be diagnosed by obtaining the oil pressure of the oil pump, comparing the oil pressure with a preset oil pressure threshold, and if the oil pressure is greater than the preset oil pressure threshold, the oil pump is determined to be in a normal operating state, and if the oil pressure is less than the preset oil pressure threshold, the step of diagnosing the working state of the oil pump according to the working current and the ambient temperature is performed. Using the oil pressure to diagnose the working state of the oil pump can improve the accuracy of the working state of the oil pump.

[0100] In an embodiment of the present invention, the oil pressure of the oil pump can be detected by an oil pressure sensor at the oil supply end of the engine. If the engine is a supercharged engine, the oil pressure of the oil pump can be detected by a high-pressure oil pressure sensor on a high-pressure oil rail.

[0101] In an embodiment of the present invention, Figure 2 As shown, the vehicle oil pump status diagnosis method may also include:

[0102] S30, after selecting the initial working mode of the oil pump as the non-operating mode, stopping the diagnosis of the working state of the oil pump.

[0103] Specifically, when the engine is not started, the initial working mode of the oil pump is selected as the non-operating mode. Since the engine is not started, the oil pump is in the non-operating mode. Therefore, after the initial working mode of the oil pump is selected as the non-operating mode, it is not necessary to diagnose the working state of the oil pump, and the diagnosis of the working state of the oil pump is stopped.

[0104] S40, after selecting the initial working mode of the oil pump as the start mode, determining the start number limit and the first start determination time, and controlling the start of the oil pump according to the start number limit and the first start determination time.

[0105] Specifically, when the engine is not in the first start state and the initial working mode of the oil pump is selected as the start mode, in order to prevent the oil pump from being in a continuous dry running state and causing a burn failure in the oil pump, a preset start number limit and the first start determination time are set.

[0106] In an embodiment of the present invention, the start-up number limit and the first start-up determination time can be set according to the performance of a specific oil pump.

[0107] In an embodiment of the present invention, controlling the oil pump start-up according to the start-up number limit and the first start-up determination time may include:

[0108] S41, counting the number of times the oil pump is started when it is started with the first start determination time length;

[0109] S42, comparing the number of starts with the start number limit;

[0110] S43, if the number of starts reaches the start number limit and the engine still does not start normally, obtain the fuel tank liquid level corresponding to the fuel pump;

[0111] S44: If the oil tank liquid level is lower than the preset dry-running warning liquid level, it is determined that the oil pump is in a dry-running state.

[0112] Specifically, the number of times the oil pump is started with the first start determination time is counted, and the counted number of starts is compared with the start number limit. If the number of starts reaches the start number limit and the engine still does not start normally, it is necessary to determine whether the reason is that the fuel tank is out of oil, and further obtain the fuel tank liquid level corresponding to the oil pump. If the fuel tank liquid level is lower than the preset dry-running warning liquid level, it is determined that the oil pump is in a dry-running state.

[0113] In an embodiment of the present invention, since the engine of a hybrid vehicle may be dragged backward after the fuel in the fuel tank is exhausted, after selecting the initial working mode of the oil pump as the start mode, the limit on the number of engine starts may be increased to determine whether the oil pump is in a dry running state.

[0114] In the embodiment of the present invention, different oil pump start times limit values ​​can be set according to the cold start mode and hot start mode of the oil pump; different oil pump start times limit values ​​can also be set according to the different power levels of the vehicle power battery. The number of engine starts should take into account the wear resistance of the oil pump. Generally, the cold start times limit value is set to be greater than or equal to 3 to 30 times, preferably 5 to 20 times; the hot start times limit value is set to be greater than or equal to 3 to 30 times, preferably 5 to 15 times.

[0115] S50, after selecting the factory mode as the initial working mode of the oil pump, determining a second start determination time length, and controlling the start of the oil pump according to the second start determination time length, wherein the first start determination time length is shorter than the second start determination time length.

[0116] Specifically, when the engine is in the first start state, after the initial working mode of the oil pump is selected as the factory mode, since there is no fuel in the oil pump and oil pipeline of the new car on the production line, the oil pump needs to empty the air in the pipeline to work, and the start-up time of the oil pump is longer than that of the non-first start state. Therefore, in order to avoid the engine being in the first start state, after the initial working mode of the oil pump is selected as the factory mode, the oil pump is mistakenly determined to be in a dry running state, and the second start determination time is set. After determining the second start determination time, the oil pump is controlled to start according to the second start determination time to prevent the oil pump from being in a dry running state for a long time and causing ablation failure of the oil pump.

[0117] In the embodiment of the present invention, the second start determination time length may be set according to the performance of a specific oil pump.

[0118] In an embodiment of the present invention, the vehicle's oil pump status diagnosis method may further include: after determining that the oil pump is in an oil jam state, performing oil jam protection on the oil pump; after determining that the oil pump is in a dry running state, performing dry running protection on the oil pump; after determining that the oil pump is in a limp state, controlling the oil pump to enter a limp mode.

[0119] Specifically, when it is determined that the working state of the oil pump is a non-operating state, in order to protect the oil pump and prevent damage to the oil pump, the next operation of the oil pump is controlled. More specifically, after it is determined that the oil pump is in an oil-locked state, the oil pump is protected from oil-locked rotation, and the oil pump is controlled to enter an oil-locked rotation protection state. After it is determined that the oil pump is in a dry-running state, the oil pump is protected from dry-running rotation, and the oil pump is controlled to enter a dry-running rotation protection state. After it is determined that the oil pump is in a limp state, the oil pump is controlled to enter a limp mode.

[0120] In an embodiment of the present invention, after determining that the oil pump is in a dry-run protection state, the vehicle oil pump state diagnosis method may further include: stopping responding to working requirements for the oil pump, and displaying prompt information through the vehicle's instrument to provide a refueling reminder.

[0121] Specifically, after the oil pump is controlled to be in a dry-running protection state, in order to further protect the oil pump, it stops responding to the working requirements of the oil pump, and displays a prompt message through the vehicle's instrument to remind the driver to refuel until the entire vehicle is powered off.

[0122] It should be noted that the oil pump status diagnosis method of the vehicle in the embodiment of the present invention is not limited to hybrid vehicles, and the oil pump is not limited to fuel pumps, oil pumps, transmission oil pumps, and steering oil pumps. The oil pump working status diagnosis method can also be applied to other products besides automobiles, such as ships, generators, etc.

[0123] The vehicle oil pump status diagnosis method of the embodiment of the present invention diagnoses the working status of the oil pump according to the working current of the oil pump and the ambient temperature of the environment in which the oil pump is located, thereby improving the accuracy of the diagnosis of the working status of the oil pump.

[0124] The present invention also provides a computer-readable storage medium.

[0125] In this embodiment, a computer program is stored on a computer-readable storage medium, and the computer program corresponds to the above-mentioned vehicle oil pump status diagnosis method. When the computer program is executed by the processor, it implements the vehicle oil pump status diagnosis method proposed in the embodiment of the second aspect of the present invention.

[0126] The invention also provides a vehicle oil pump status diagnosis system.

[0127] Fig.10 FIG. 1 is a schematic diagram of the structure of a vehicle oil pump status diagnosis system according to an embodiment of the present invention. Fig.10As shown, the oil pump status diagnosis system 100 of the vehicle includes an oil pump 40 , a temperature sensor 60 , an electronic control unit (EDU) 20 , and a domain controller (DCU) or an oil pump controller (MCU) 30 .

[0128] Among them, the temperature sensor 60 is used to detect the ambient temperature of the environment in which the oil pump is located; the electronic control unit 20 is used to forward the ambient temperature to the domain controller or the oil pump controller; the domain controller or the oil pump controller 30 is used to detect the working current of the oil pump, and when it is determined that the initial working mode of the oil pump is the operating mode, the working state of the oil pump is diagnosed according to the working current and the ambient temperature.

[0129] In an embodiment of the present invention, the domain controller or the oil pump controller 30 is also used to, after determining that the oil pump is in an oil jam state, perform oil jam protection on the oil pump; after determining that the oil pump is in a dry running state, perform dry running protection on the oil pump; after determining that the oil pump is in a limp state, control the oil pump to enter a limp mode.

[0130] In an embodiment of the present invention, Figure 2 As shown, the working modes of the oil pump include non-working mode, factory mode, start mode, running mode and limp mode. Among them, the start mode also includes cold start mode and hot start mode.

[0131] In an embodiment of the present invention, a temperature sensor is used to detect the ambient temperature of the environment in which the oil pump is located. The temperature sensor transmits the detected ambient temperature to the electronic control unit 20. The temperature sensor may be an outdoor temperature sensor on the vehicle, wherein the outdoor temperature sensor is a sensor used by a system such as an air conditioner in the vehicle to detect the ambient temperature outside the vehicle. When the outdoor temperature sensor is used to detect the ambient temperature of the environment in which the oil pump is located, no additional temperature sensor is needed, which can reduce the cost of the diagnostic system.

[0132] In an embodiment of the present invention, an oil level sensor is used to detect the oil level in the oil tank 50. The oil level sensor transmits the detected oil tank level to the domain controller or the oil pump controller 30. It should be noted that the oil level sensor is generally integrated into the oil pump assembly, but the oil level sensor is not limited to being integrated on the oil pump, that is, the oil level sensor can also be independent of the pump core part of the oil pump. When the oil pump assembly is integrated with the oil level sensor, the oil level sensor integrated in the oil pump assembly is used to detect the oil tank level, and there is no need to add an additional oil level sensor, which can reduce the cost of the diagnostic system.

[0133] In an embodiment of the present invention, a temperature sensor inside and outside the vehicle cabin is used to detect the ambient temperature of the environment in which the oil pump is located, and an oil level sensor integrated in the oil pump assembly is used to detect the oil level in the fuel tank. When the vehicle's oil pump status diagnosis system is used to diagnose the working status of the oil pump, there is no need to add additional components, thereby reducing the cost of the oil pump status diagnosis system.

[0134] As a specific example, Fig.11 As shown, the electronic control unit 20 is used to obtain the engine status and transmit the engine status to the domain controller or the oil pump controller 30.

[0135] As another specific example, Fig.12 As shown, the oil level sensor can directly output the oil tank liquid level to the domain controller or the oil pump controller 30. The oil level sensor can also output the oil tank liquid level to the meter 70, and the meter 70 then feeds the oil tank liquid level back to the domain controller or the oil pump controller 30.

[0136] As another specific example, Fig.13 As shown, the functions of the domain controller or the oil pump controller 30 may also be integrated into the electronic control unit 20 , and all functions of the domain controller or the oil pump controller 30 may be completed by the integrated electronic control unit 20 .

[0137] Fig.14 FIG. 1 is a diagnostic flow chart of a vehicle oil pump status diagnostic system according to a specific embodiment of the present invention. Fig.14, the diagnostic process of the oil pump status diagnostic system of the vehicle of the present invention is described: the engine status of the vehicle is obtained; when the engine is in operation and the engine has a rotation speed, the initial working mode of the oil pump is selected as the running mode. The initial working mode of the oil pump is determined to be the running mode. After determining that the initial working mode of the oil pump is the running mode, in order to prevent the oil pump circuit from being bad and affecting the diagnosis of the working state of the oil pump, it is possible to further detect whether the oil pump circuit is normal. If the oil pump circuit is abnormal, it indicates that the domain controller or the oil pump controller 30 is faulty, and the domain controller or the oil pump controller 30 fault is fed back to the instrument. If the oil pump circuit is normal, the working state of the oil pump is diagnosed, the working current of the oil pump is detected, and the working current of the oil pump is compared with the first threshold and the second threshold. If the working current is less than the second threshold and greater than the first threshold, it indicates that the oil pump is in the running state, and the working state diagnosis of the oil pump in the next cycle is performed. If the working current is greater than the second threshold, it indicates that the oil pump is in the oil jam state, and the oil pump is further controlled to enter the oil jam protection state. Feedback the oil jam fault information to the instrument. If the working current is less than the first threshold value and lasts for the first preset time, the oil tank level is detected. If the oil tank level is greater than or equal to the preset dry-running warning level, the oil pump is in limp mode, and the oil pump working status diagnosis of the next cycle is performed. If the oil tank level is less than the preset dry-running warning level, it means that the oil pump is in a dry-running state, and the oil pump is further controlled to enter a dry-running protection state, and the dry-running fault information is fed back to the instrument.

[0138] In the embodiments of the present invention, see Fig.15 When using oil pressure to diagnose the working state of the oil pump, after judging that the oil pump circuit is normal, the obtained oil pressure is compared with the oil pressure threshold. If the oil pressure is greater than the oil pressure threshold, it means that the oil pump is in the running mode, and the working state of the oil pump in the next cycle is diagnosed. If the oil pressure is less than the oil pressure threshold, the relationship between the working current of the oil pump and the first threshold and the second threshold is further determined to further diagnose the working state of the oil pump. Among them, further diagnosing the working state of the oil pump is the same as the above-mentioned diagnosis method, which will not be repeated here.

[0139] It should be noted that, for other specific implementations of the oil pump status diagnosis system of the embodiment of the present invention, reference may be made to the specific implementations of the oil pump status diagnosis method of the above embodiment of the present invention.

[0140] The oil pump status diagnosis system of the embodiment of the present invention diagnoses the working status of the oil pump based on the working current of the oil pump and the ambient temperature of the environment in which the oil pump is located, thereby improving the accuracy of the diagnosis of the working status of the oil pump and reducing the diagnosis cost, thereby effectively protecting the oil pump and preventing the oil pump from ablation failure.

[0141] The present invention also provides a vehicle.

[0142] Fig.16 FIG. 1 is a schematic diagram of the structure of a vehicle according to an embodiment of the present invention. Fig.16 As shown, vehicle 1000 includes the above-mentioned vehicle oil pump status diagnosis system 100.

[0143] The vehicle of the embodiment of the present invention utilizes the above-mentioned vehicle oil pump status diagnostic system to diagnose the working status of the oil pump based on the working current of the oil pump and the ambient temperature of the environment in which the oil pump is located, thereby improving the accuracy of the diagnosis of the working status of the oil pump, reducing the diagnostic cost, and effectively protecting the oil pump to prevent the oil pump from ablation failure.

[0144] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection portion with one or more wirings (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0145] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0146] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0147] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0148] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0149] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0150] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0151] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A method for diagnosing the oil pump status of a vehicle, characterized in that: The method comprises: Determine that the initial working mode of the oil pump is the running mode; Obtaining the operating current of the oil pump and the ambient temperature of the environment in which the oil pump is located; The working state of the oil pump is diagnosed according to the working current and the ambient temperature, wherein the diagnosing the working state of the oil pump according to the working current and the ambient temperature includes: Determine a first threshold and a second threshold according to the ambient temperature, wherein the first threshold is less than the second threshold; comparing the operating current with the first threshold and the second threshold respectively; If the operating current is greater than the second threshold, it is determined that the oil pump is in an oil-stuck state; If the operating current is greater than or equal to the first threshold value and less than or equal to the second threshold value, it is determined that the oil pump is in an operating state; If the operating current is less than the first threshold value and lasts for a first preset time, the oil tank liquid level corresponding to the oil pump is obtained, and the operating state of the oil pump is diagnosed according to the oil tank liquid level.

2. The vehicle oil pump status diagnosis method according to claim 1, characterized in that: Before determining that the initial working mode of the oil pump is the running mode, the method further includes: Obtaining an engine status of the vehicle; An initial operating mode of the oil pump is selected according to the engine state.

3. The method for diagnosing the oil pump status of a vehicle according to claim 2, characterized in that: The selecting the initial working mode of the oil pump according to the engine state includes: If the engine is in an unstarted state, the initial working mode of the oil pump is selected to be a non-operating mode; If the engine is in a running state, the initial working mode of the oil pump is selected as the running mode; If the engine is not in the first start state, the initial working mode of the oil pump is selected as the start mode; If the engine is in the first start state, the initial working mode of the oil pump is selected as the factory mode.

4. The vehicle oil pump status diagnosis method according to claim 1, characterized in that: The determining the first threshold and the second threshold according to the ambient temperature comprises: Acquiring identity information of the oil pump, and determining the durability time of the oil pump according to the identity information; Determine a first variation interval according to the ambient temperature, and determine a second variation interval according to the endurance time; The maximum value between the first change interval and the second change interval is used as the second threshold, and the minimum value between the first change interval and the second change interval is used as the first threshold.

5. The vehicle oil pump status diagnosis method according to claim 1, characterized in that: The diagnosing the working state of the oil pump according to the oil tank liquid level includes: comparing the oil tank liquid level with a preset dry-running warning liquid level; If the oil tank liquid level is greater than or equal to the preset dry-running warning liquid level, it is determined that the oil pump is in a limp state; If the oil tank liquid level is less than the preset dry-running warning liquid level, it is determined that the oil pump is in a dry-running state.

6. The method for diagnosing the oil pump status of a vehicle according to any one of claims 1 to 3, characterized in that: After determining that the initial working mode of the oil pump is the running mode, the method further includes: Acquiring the oil pressure of the oil pump, and comparing the oil pressure with a preset oil pressure threshold; If the oil pressure is greater than the preset oil pressure threshold, it is determined that the oil pump is in a normal operating state; If the oil pressure is less than the preset oil pressure threshold, the step of diagnosing the working state of the oil pump according to the working current and the ambient temperature is performed.

7. The method for diagnosing the oil pump status of a vehicle according to claim 3, characterized in that: The method further comprises: After the initial working mode of the oil pump is selected as the non-operating mode, diagnosing the working state of the oil pump is stopped; After selecting the initial working mode of the oil pump as the start mode, determining a start number limit and a first start determination time, and controlling the start of the oil pump according to the start number limit and the first start determination time; After selecting the initial working mode of the oil pump as the factory mode, determining a second start determination time length, and controlling the start of the oil pump according to the second start determination time length, wherein the first start determination time length is less than the second start determination time length.

8. The method for diagnosing the oil pump status of a vehicle according to claim 7, characterized in that: The controlling the oil pump to start according to the start number limit and the first start determination time length includes: counting the number of times the oil pump is started when it is started with the first start determination time length; comparing the number of starts with the start number limit; If the number of starts reaches the start number limit and the engine still fails to start normally, obtaining the oil tank liquid level corresponding to the oil pump; If the oil tank liquid level is less than a preset dry-running warning liquid level, it is determined that the oil pump is in a dry-running state.

9. The method for diagnosing the oil pump status of a vehicle according to any one of claims 1 to 3, characterized in that: After determining that the initial working mode of the oil pump is the running mode, the method further includes: determining a required voltage of the oil pump according to the operating mode; According to the required voltage and the working current, determining to perform oil pump circuit detection; Wherein, when both the required voltage and the operating current are not 0, the step of diagnosing the operating state of the oil pump is performed.

10. The vehicle oil pump status diagnosis method according to claim 5, characterized in that: The method further comprises: After determining that the oil pump is in an oil-blocked state, performing oil-blocked protection on the oil pump; After determining that the oil pump is in a dry-running state, performing dry-running protection on the oil pump; After determining that the oil pump is in a limp-home state, the oil pump is controlled to enter a limp-home mode.

11. The vehicle oil pump status diagnosis method according to claim 5, characterized in that: After determining that the oil pump is in a dry running protection state, the method further includes: Stop responding to the working demand of the oil pump, and display a prompt message through the instrument of the vehicle to remind you to refuel.

12. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the oil pump status diagnosis method for a vehicle according to any one of claims 1 to 11 is implemented.

13. A vehicle oil pump status diagnosis system, characterized in that: The system comprises: Oil pump; A temperature sensor, used to detect the ambient temperature of the environment in which the oil pump is located; an electronic control unit for forwarding the ambient temperature to a domain controller or an oil pump controller; The domain controller or the oil pump controller is used to detect the working current of the oil pump, and when it is determined that the initial working mode of the oil pump is the running mode, diagnose the working state of the oil pump according to the working current and the ambient temperature, Wherein, the domain controller or the oil pump controller is used to determine a first threshold and a second threshold according to the ambient temperature, wherein the first threshold is less than the second threshold; compare the working current with the first threshold and the second threshold respectively; if the working current is greater than the second threshold, it is determined that the oil pump is in an oil stall state; if the working current is greater than or equal to the first threshold and less than or equal to the second threshold, it is determined that the oil pump is in an operating state; if the working current is less than the first threshold and lasts for a first preset time, the oil tank level corresponding to the oil pump is obtained, and the working state of the oil pump is diagnosed according to the oil tank level.

14. A vehicle, characterized in that: The vehicle oil pump status diagnostic system comprises the vehicle oil pump status diagnostic system as claimed in claim 13.

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