Method, device and related equipment for monitoring failure of lubricating oil cooling system

Abstract

The application provides a kind of lubricating oil cooling system failure monitoring method, device and related equipment. For the lubricating oil cooling system including electronic pump, mechanical pump and lubricating oil storage equipment, whether mechanical pump fails can be judged by the working parameter of electronic pump, so as to realize comprehensive failure monitoring of lubricating oil cooling system. Specifically, if electronic pump is in working state, flow parameter and actual load parameter of electronic pump can be obtained. If mechanical pump is also in working state, first theoretical load parameter of electronic pump can be determined according to flow parameter of electronic pump. First theoretical load parameter represents the load condition of electronic pump when the flow of electronic pump matches flow parameter under the condition that electronic pump and mechanical pump are both in normal working state. If the load represented by actual load parameter is less than the load represented by first theoretical load parameter, it can be determined that mechanical pump fails.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and in particular to a fault monitoring method, device and related equipment for a lubricating oil cooling system. Background Technology

[0002] A lubricating oil cooling system, also known as an oil-cooling system, refers to a system that uses lubricating oil to cool and lubricate components. Since lubricating oil, as a cooling medium, is mostly not directly overhead, oil cooling can provide immersion cooling for electrically charged components, resulting in higher cooling efficiency. For example, as motor power increases, traditional air-cooling and water-cooling systems may not be sufficient to meet the cooling requirements of the motor, necessitating the use of oil cooling to cool components such as the motor and gearbox.

[0003] In some scenarios, lubricating oil cooling systems may include both mechanical and electric pumps. When the lubricating oil cooling system is operating, the electric and mechanical pumps can simultaneously pump lubricating oil for cooling. The mechanical pump is powered by an engine or electric motor, while the electric pump is powered by its own motor. By adjusting the motor's operating parameters, the flow rate of the electric pump can be controlled, thereby adjusting the amount of lubricating oil pumped by the lubricating oil cooling system.

[0004] However, mechanical pumps are powered by equipment outside the lubricating oil cooling system, so they often do not have sensors installed and cannot detect malfunctions. Summary of the Invention

[0005] In view of this, this application provides a method, apparatus and related equipment for fault monitoring of a lubricating oil cooling system, aiming to improve the comprehensive fault monitoring of the lubricating oil cooling system.

[0006] In a first aspect, this application provides a fault monitoring method for a lubricating oil cooling system, the lubricating oil cooling system including an electronic pump, a mechanical pump and a lubricating oil storage device, the electronic pump and the mechanical pump being used to pump lubricating oil from the lubricating oil storage device so as to use the lubricating oil to cool and lubricate the device to be cooled;

[0007] The method includes:

[0008] In response to the electronic pump being in operation, the flow rate parameters and actual load parameters of the electronic pump are acquired;

[0009] In response to the mechanical pump being in operation, the first theoretical load parameter of the electronic pump is determined based on the flow parameters of the electronic pump;

[0010] If the load represented by the actual load parameter is less than the load represented by the first theoretical load parameter, the mechanical pump is determined to be faulty.

[0011] In some possible implementations, after obtaining the flow parameters and actual load parameters of the electronic pump, the method further includes:

[0012] In response to the mechanical pump being in operation, a second theoretical load parameter of the electronic pump is determined based on the flow parameters of the electronic pump, wherein the load represented by the second theoretical load parameter is less than the load represented by the first theoretical load parameter.

[0013] If the load represented by the actual load parameter is less than the load represented by the second theoretical load parameter, it is determined that the lubricating oil cooling system has an oil shortage fault.

[0014] The step of determining that the mechanical pump has malfunctioned if the load represented by the actual load parameter is less than the load represented by the first theoretical load parameter includes:

[0015] If the load represented by the actual load parameter is greater than the load represented by the second theoretical load parameter but less than the load represented by the first theoretical load parameter, the mechanical pump is determined to be faulty.

[0016] In some possible implementations, after obtaining the flow parameters and actual load parameters of the electronic pump, the method further includes:

[0017] In response to the mechanical pump being in a non-operating state, a third theoretical load parameter of the electronic pump is determined based on the flow rate parameter;

[0018] If the load represented by the actual load parameter is less than the load represented by the third theoretical load parameter, it is determined that the lubricating oil cooling system has an oil shortage fault.

[0019] In some possible implementations, the method further includes, before obtaining the actual load parameters:

[0020] In response to the electronic pump being in a non-operating state, the electronic pump is controlled to operate according to the preset flow parameters; the first theoretical load parameter is a preset theoretical load parameter of the electronic pump under the flow parameters.

[0021] In some possible implementations, the actual load parameter includes the actual quadrature-axis current of the electronic pump, and the first theoretical load parameter includes the theoretical quadrature-axis current of the electronic pump;

[0022] Determining the first theoretical load parameter of the electronic pump based on its flow rate parameter includes:

[0023] Based on a preset correspondence, the theoretical quadrature-axis current corresponding to the flow rate parameter is determined. The preset correspondence is the variation law of the quadrature-axis current of the electronic pump with the flow rate parameter obtained by testing under the fault-free operating condition of the lubricating oil cooling system.

[0024] Secondly, this application provides a fault monitoring device for a lubricating oil cooling system. The lubricating oil cooling system includes an electronic pump, a mechanical pump, and a lubricating oil storage device. The electronic pump and the mechanical pump are used to pump lubricating oil from the lubricating oil storage device so as to use the lubricating oil to cool and lubricate the device to be cooled.

[0025] The device includes:

[0026] The acquisition unit is used to acquire the flow parameters and actual load parameters of the electronic pump in response to the electronic pump being in a working state.

[0027] Theoretical load determination unit is used to determine the first theoretical load parameter of the electronic pump based on the flow parameters of the electronic pump in response to the mechanical pump being in operation.

[0028] The fault determination unit is used to determine that the mechanical pump has malfunctioned if the load represented by the actual load parameter is less than the load represented by the first theoretical load parameter.

[0029] In some possible implementations, the theoretical load determination unit is further configured to, in response to the mechanical pump being in operation, determine a second theoretical load parameter of the electronic pump based on the flow parameters of the electronic pump, wherein the load represented by the second theoretical load parameter is less than the load represented by the first theoretical load parameter; the fault judgment unit is specifically configured to determine that the lubricating oil cooling system has an oil shortage fault if the load represented by the actual load parameter is less than the load represented by the second theoretical load parameter; and to determine that the mechanical pump has a fault if the load represented by the actual load parameter is greater than the load represented by the second theoretical load parameter but less than the load represented by the first theoretical load parameter.

[0030] In some possible implementations, the theoretical load determination unit is further configured to determine a third theoretical load parameter of the electronic pump based on the flow rate parameter in response to the mechanical pump being in a non-operating state; the fault judgment unit is further configured to determine that the lubricating oil cooling system has an oil shortage fault if the load represented by the actual load parameter is less than the load represented by the third theoretical load parameter.

[0031] In some possible implementations, the device further includes a control unit for controlling the electronic pump to operate according to a preset flow parameter in response to the electronic pump being in a non-operating state; the first theoretical load parameter is a preset theoretical load parameter of the electronic pump under the flow parameter.

[0032] In some possible implementations, the actual load parameter includes the actual quadrature-axis current of the electronic pump, and the first theoretical load parameter includes the theoretical quadrature-axis current of the electronic pump; the theoretical load determination unit is specifically used to determine the theoretical quadrature-axis current corresponding to the flow rate parameter according to a preset correspondence, wherein the preset correspondence is the variation law of the quadrature-axis current of the electronic pump with the flow rate parameter obtained by testing under the fault-free operating condition of the lubricating oil cooling system.

[0033] Thirdly, this application provides a control device, the control device including a memory and a processor, the memory being used to store instructions or code, and the processor being used to execute the instructions or code stored in the memory to implement the method as described in any one of the preceding first aspects.

[0034] Fourthly, this application provides a lubricating oil cooling system, which includes an electronic pump, a mechanical pump, and a lubricating oil storage device. The electronic pump and the mechanical pump are used to pump lubricating oil from the lubricating oil storage device so as to use the lubricating oil to cool and lubricate the device to be cooled. The lubricating oil cooling system also includes the control device described in the third aspect above.

[0035] Fifthly, this application provides a vehicle that includes the lubricating oil cooling system as described in the fourth aspect.

[0036] In a sixth aspect, this application provides a computer storage medium storing code, wherein when the code is executed, a device executing the code implements the method described in any of the first aspects above.

[0037] In a seventh aspect, a computer program product containing instructions is provided, which, when run on a computer, causes the computer to perform the method described in any of the first aspects.

[0038] This application provides a fault monitoring method, apparatus, and related equipment for a lubricating oil cooling system. For a lubricating oil cooling system including an electronic pump, a mechanical pump, and a lubricating oil storage device, the operating parameters of the electronic pump can be used to determine whether the mechanical pump is malfunctioning, thereby achieving comprehensive fault monitoring of the lubricating oil cooling system. Specifically, if the electronic pump is operating, its flow rate parameters and actual load parameters can be obtained. If the mechanical pump is also operating, its first theoretical load parameter can be determined based on the electronic pump's flow rate parameters. The first theoretical load parameter characterizes the load of the electronic pump when its flow rate matches its flow rate parameters, assuming both the electronic and mechanical pumps are operating normally. If the load characterized by the actual load parameter is less than the load characterized by the first theoretical load parameter, it indicates that the current load of the electronic pump is less than the load of the mechanical pump during normal operation. Since the first theoretical load parameter and the actual load parameter correspond to the same flow rate parameter, it indicates that the pressure difference between the electronic pump's inlet and outlet is less than the pressure difference between the electronic pump's inlet and outlet during normal mechanical operation. Therefore, it can be deduced that the actual pressure difference provided by the mechanical pump is less than the pressure difference provided during normal mechanical operation, thus determining that the mechanical pump has malfunctioned. In this way, based on the correspondence between the flow rate and load of the electronic pump, it can be deduced whether the pressure difference provided by the mechanical pump is less than the pressure difference provided during normal operation, thereby determining whether the mechanical pump has malfunctioned and realizing comprehensive fault monitoring of the lubricating oil cooling system. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in this embodiment or the prior art, the drawings used in the description of the embodiment or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 This is a schematic diagram of a lubricating oil cooling system provided in an embodiment of this application;

[0041] Figure 2 A schematic flowchart of a fault monitoring method provided in an embodiment of this application;

[0042] Figure 3 Another flowchart illustrating the fault monitoring method provided in this application embodiment;

[0043] Figure 4 This is a schematic diagram of a fault monitoring device provided in an embodiment of this application. Detailed Implementation

[0044] Lubricating oil cooling systems can include electric pumps and / or mechanical pumps. Mechanical pumps, also known as mechanical oil pumps (MOPs), are powered outside the lubricating oil cooling system. For example, in a vehicle's lubricating oil cooling system, the input shaft of the mechanical pump can be connected to the main shaft of the engine or electric motor, obtaining power from the engine. Electric pumps, also known as electronic oil pumps (EOPs), are powered by the pump itself, for example, by its own motor.

[0045] High-power electric pumps are often expensive. Therefore, some lubricating oil cooling systems can use both electric and mechanical pumps. The mechanical pump provides one portion of the flow, while the electric pump provides the other. This reduces the power requirement of the electric pump and allows for flexible adjustment of the pumped oil volume.

[0046] To ensure the proper functioning of electric pumps, multiple sensors can be deployed on them to monitor parameters during operation and to detect malfunctions promptly. However, mechanical pumps often lack sensors for fault monitoring. If a mechanical pump malfunctions, the existing lubricating oil cooling system may not be able to detect the problem in time.

[0047] In view of this, embodiments of this application provide a fault monitoring method for a lubricating oil cooling system. This method can be applied to a lubricating oil cooling system including an electronic pump, a mechanical pump, and a lubricating oil storage device. This method can infer the operating status of the mechanical pump based on the operating parameters of the electronic pump, thereby determining whether the mechanical pump is operating normally and achieving the purpose of fault monitoring.

[0048] To facilitate explanation, we will first introduce the application scenarios and principles of this fault monitoring method.

[0049] Specifically, see Figure 1 The figure is a schematic diagram of a lubricating oil cooling system provided in an embodiment of this application. Figure 1 The application scenario shown includes a lubricating oil cooling system 110, an engine 120, and a transmission 130. The transmission 130 is the component to be cooled, and the engine 120 provides power to the mechanical pump 111 in the lubricating oil cooling system 110.

[0050] The lubricating oil cooling system 110 includes a mechanical pump 111, an electric pump 112, a lubricating oil storage device 113, and a control device 114. The lubricating oil storage device 113 may be, for example, an oil tank for storing lubricating oil. The control device 114 can execute the fault monitoring method provided in the embodiments of this application.

[0051] Mechanical pump 111 and electric pump 112 can respectively draw lubricating oil from lubricating oil storage device 113 and deliver it to transmission 130 through a unified oil circuit, thereby lubricating and cooling transmission 130. The lubricating oil cooling system 110 may also include cooling equipment (…). Figure 1 (Not shown in the image) is used to cool the lubricating oil. Figure 1 The direction of the middle arrow indicates the direction of lubricant flow.

[0052] The inventors of this application have discovered that in a lubricating oil cooling system, the cross-sectional area of ​​the lubricating oil passage is basically fixed, so the flow rate of the oil passage can be used to represent the flow velocity of the oil passage. Since the outlets of the mechanical pump 111 and the electronic pump 112 merge into the same oil passage, the sum of the flow rates of the oil passages can be equal to the flow rates of the mechanical pump 111 and the electronic pump 112.

[0053] In other words, when both mechanical pump 111 and electronic pump 112 are operating normally, they pump lubricating oil into the oil circuit. The flow rate and velocity of the lubricating oil in the oil circuit are relatively high, while the pressure is relatively low. If the pressure of the lubricating oil in the lubricating oil storage device 113 is considered constant, then electronic pump 112 needs to overcome a significant pressure difference to pump lubricating oil from the lubricating oil storage device 113 into the oil circuit. Therefore, electronic pump 112 experiences a relatively large load.

[0054] If the mechanical pump 111 malfunctions, it cannot pump lubricating oil from the lubricating oil storage device 113 into the oil circuit, or the flow rate of lubricating oil pumped from the lubricating oil storage device 113 into the oil circuit is less than the normal flow rate. Therefore, compared to when the mechanical pump 111 is operating normally, the flow rate and velocity of the lubricating oil in the oil circuit decrease, while the pressure increases. Consequently, due to the increased pressure in the oil circuit, the pressure difference that the electronic pump 112 needs to overcome to pump lubricating oil from the lubricating oil storage device 113 into the oil circuit decreases, thus reducing the load on the electronic pump 112.

[0055] In other words, the load of the electronic pump 112 will decrease as the mechanical pump 111 fails, so the load of the electronic pump can be used to determine whether the mechanical pump 111 has failed.

[0056] In addition, the lubricating oil cooling system 100 may also experience an oil shortage fault. An oil shortage fault refers to insufficient lubricating oil in the oil circuit and the lubricating oil storage device 113. When an oil shortage fault occurs, there is not enough lubricating oil in the lubricating oil storage device 113 to be pumped out by the electronic pump 112, causing the electronic pump 112 to pump out less lubricating oil per unit time than the theoretically required amount. This also leads to a reduction in the load on the electronic pump. Furthermore, because there is insufficient lubricating oil entering the electronic pump, the degree of load reduction caused by the oil shortage fault will be greater than the degree of load reduction caused by a mechanical pump fault.

[0057] The application scenarios and principles of this application have been introduced above. The following section describes the fault monitoring method for the lubricating oil cooling system provided in this application embodiment from the perspective of a fault monitoring device. The fault monitoring device is a software module used to monitor faults in the lubricating oil cooling system. Optionally, the fault monitoring device can run in the controller of the electronic pump. Alternatively, the fault monitoring device can also run in the vehicle controller or the controller of the lubricating oil cooling system, for example, it can run in... Figure 1 In the control device 114 of the illustrated embodiment.

[0058] Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0059] See Figure 2 , Figure 2 A flowchart of a method for fault monitoring of a lubricating oil cooling system provided in this application embodiment includes:

[0060] S201: In response to the electric pump being in operation, acquire the flow parameters and actual load parameters of the electric pump.

[0061] As described above, the fault monitoring device can determine whether the mechanical pump is malfunctioning or experiencing oil shortage based on the load of the electronic pump during operation. To achieve this fault monitoring, the device can acquire the flow rate and actual load parameters of the electronic pump while it is in operation.

[0062] The flow rate parameter of the electric pump indicates the amount of lubricating oil pumped out, and may include, for example, the flow rate of lubricating oil pumped out of the lubricating oil storage device per unit time. The actual load parameter of the electric pump represents the actual load on the pump, and may include, for example, the power data of the pump. In some possible implementations, the actual load parameter may also include the actual quadrature-axis current of the pump, i.e., the Q-axis current. For example, if the electric pump is driven by a synchronous motor, then the actual load parameter may include the actual quadrature-axis current. Accordingly, the theoretical load parameter described below may be the theoretical quadrature-axis current.

[0063] In some possible implementations, the electric pump may be in a non-operating state. In this case, the fault monitoring device cannot determine whether there is a fault in the lubricating oil cooling system based on the load of the electric pump. Therefore, to achieve fault monitoring, the fault monitoring device can start the electric pump.

[0064] Specifically, the fault monitoring device can store pre-set flow parameters. When there is a fault monitoring requirement but the electronic pump is not in operation, the fault monitoring device can control the electronic pump to operate according to the preset flow parameters and collect the actual load parameters of the electronic pump when operating according to the preset flow parameters. In this way, by actively controlling the operation of the electronic pump, fault monitoring can be performed when the electronic pump is not in operation, improving the comprehensiveness of fault monitoring.

[0065] If the flow rate of the electric pump is unstable, it may lead to inaccurate fault monitoring results. Optionally, fault monitoring can be performed when the flow rate of the electric pump is relatively stable. In other words, the fault monitoring device can proceed with subsequent steps only after confirming that the flow rate parameters of the electric pump are stable.

[0066] S202: In response to the mechanical pump being in operation, determine the first theoretical load parameters of the electronic pump based on the flow parameters of the electronic pump.

[0067] As described above, the fault monitoring device can determine whether the mechanical pump is malfunctioning based on the load of the electronic pump during operation. If the mechanical pump is not in operation, the fault monitoring device cannot determine whether it is malfunctioning. If the mechanical pump is in operation, the fault monitoring device can determine the first theoretical load parameter of the electronic pump based on the obtained flow parameters of the electronic pump.

[0068] The first theoretical load parameter corresponds to the flow rate parameter of the electronic pump, representing the load condition of the electronic pump operating under the flow rate parameter when the lubricating oil cooling device is fault-free. Optionally, if the actual load parameter includes the actual quadrature-axis current of the electronic pump, the first theoretical load parameter may also include the theoretical quadrature-axis current. If the actual quadrature-axis current of the electronic pump is less than the theoretical quadrature-axis current, it can be considered that the load of the electronic pump is less than the load of the mechanical pump during normal operation, thus determining that the mechanical pump has failed.

[0069] Optionally, to ensure accuracy, the fault detection can be performed at a higher mechanical pump speed. For example, if the mechanical pump is connected to the engine's output shaft, fault monitoring can be performed only when the engine speed exceeds a preset speed. Optionally, the preset speed could be, for example, 1500 revolutions per minute (rpm).

[0070] The following section uses load parameters including quadrature axis current as an example to introduce some ways to determine the first theoretical load parameters.

[0071] To determine the quadrature-axis current corresponding to the first theoretical load parameter, the variation of the quadrature-axis current of the electric pump with the flow rate parameter of the electric pump under fault-free operating conditions of the lubricating oil cooling system can be tested in advance in an experimental environment. Specifically, a test environment can be set up first, ensuring that the lubricating oil cooling system in the test environment is fault-free. Then, the mechanical pump and electric pump in the lubricating oil cooling system can be started, the flow rate parameter of the electric pump can be adjusted, and the correspondence between the flow rate parameter and the quadrature-axis current can be recorded. This correspondence can be preset in the fault monitoring device. In this way, when the fault monitoring device performs fault monitoring, the theoretical quadrature-axis current corresponding to the flow rate parameter can be determined according to the preset correspondence, thus obtaining the first theoretical load parameter.

[0072] Optionally, the correspondence can be directly obtained from the tested quadrature-axis current, or the quadrature-axis current can be corrected, and the correspondence between the corrected quadrature-axis current and the flow parameters can be preset in the fault monitoring device. Specifically, considering the possibility of errors in actual application scenarios, the quadrature-axis current corresponding to the flow parameters can be adaptively reduced. For example, the tested quadrature-axis current can be subtracted from the preset correction value, and a correspondence can be established between the difference and the flow parameters. In this way, correcting the quadrature-axis current with the correction value can avoid misdiagnosis by the fault monitoring device.

[0073] In real-world scenarios, the viscosity of lubricating oil can be affected by temperature. At different viscosities, the power output required by an electric pump to achieve the same flow rate may vary. Therefore, the first theoretical load parameter can also be correlated with temperature. This approach considers not only the impact of flow rate on the electric pump's load but also the impact of temperature. This avoids the influence of temperature on fault monitoring results, allowing for more accurate fault monitoring.

[0074] In other words, the aforementioned preset correspondence can include the relationship between temperature, flow rate parameters, and quadrature-axis current. Optionally, the quadrature-axis current of the electric pump at different temperatures and flow rates can be tested under fault-free operating conditions to obtain the correspondence. Similarly, the second theoretical load parameters described below can also be obtained using a similar method, which will not be elaborated here.

[0075] S203: If the load represented by the actual load parameter is less than the load represented by the first theoretical load parameter, the mechanical pump is determined to be faulty.

[0076] After obtaining the actual load parameters and the first theoretical load parameters of the electronic pump, the actual load and the theoretical load of the electronic pump can be compared. If the load represented by the actual load parameters is less than the load represented by the first theoretical load parameters, it indicates that the actual load of the electronic pump is less than the load of the mechanical pump when it is working normally, and the mechanical pump of the lubricating oil cooling system is faulty.

[0077] In this way, based on the correspondence between the flow rate and load of the electronic pump, it can be deduced whether the pressure difference provided by the mechanical pump is less than the pressure difference provided during normal operation, thereby determining whether the mechanical pump has malfunctioned and realizing comprehensive fault monitoring of the lubricating oil cooling system.

[0078] Optionally, after a mechanical pump failure is determined, to ensure that the components to be cooled are properly cooled and lubricated, the flow rate of the electric pump can be increased to compensate for the flow rate provided by the failed mechanical pump. And / or, the heat generation of the lubricated components can also be limited. For example, if the lubricated component is the transmission of a hybrid vehicle, the output power of the electric motor and / or engine can be limited.

[0079] As mentioned earlier, the lubricating oil cooling system can also experience oil shortage faults. The degree of load reduction in the electric pump due to oil shortage is greater than that caused by a mechanical pump failure. Therefore, before determining whether the mechanical pump is faulty based on the electric pump's load parameters, it's advisable to first determine whether the load reduction in the electric pump is due to an oil shortage fault in the lubricating oil cooling system.

[0080] Specifically, after obtaining the flow rate and load parameters of the electronic pump, if the mechanical pump is operating, the fault monitoring device can also determine the second theoretical load parameter of the electronic pump based on its flow rate parameters. The second theoretical load parameter represents the lowest load the electronic pump can withstand at the specified flow rate parameters, assuming no oil shortage fault in the lubricating oil cooling system and both the electronic and mechanical pumps are operating normally. If the load represented by the actual load parameters is less than the load represented by the second theoretical load parameter, it can be determined that an oil shortage fault has occurred in the lubricating oil cooling system.

[0081] Optionally, after determining that there is a lack of lubrication in the lubrication cooling system, in order to ensure that the components to be cooled receive timely cooling and lubrication, the heat generation of the lubricated parts can be limited. For example, if the lubricated component is the transmission of a hybrid vehicle, the output power of the electric motor and / or engine can be limited.

[0082] Understandably, the impact of an oil shortage fault on the load of the electric pump is greater than that of a mechanical pump fault. Therefore, the load of the electric pump represented by the second theoretical load parameter is less than the load represented by the first theoretical load parameter. In other words, if the actual load of the electric pump is less than the load represented by the second theoretical load parameter, it can be determined that the lubricating oil cooling system has an oil shortage fault. If the actual load of the electric pump is not less than the load represented by the second theoretical load parameter and is less than the load represented by the first theoretical load parameter, it can be determined that the lubricating oil cooling system does not have an oil shortage fault, and the mechanical pump has failed. If the actual load of the electric pump is not less than the load represented by the first theoretical load parameter, it can be determined that neither the lubricating oil cooling system nor the mechanical pump has failed.

[0083] Furthermore, even when the mechanical pump is not in operation, the load of the electronic pump can be used to determine whether there is a lack of oil in the lubricating oil cooling system.

[0084] Specifically, if the electric pump is operating while the mechanical pump is not, the fault monitoring device can determine the third theoretical load parameter of the electric pump based on its flow rate parameters. This third theoretical load parameter represents the lowest load the electric pump can withstand at the specified flow rate parameters, assuming no oil shortage in the lubricating oil cooling system and only the electric pump is operating. If the actual load parameter represents a lower load than the third theoretical load parameter, it indicates that there is insufficient lubricating oil in the lubricating oil storage device for the electric pump to pump.

[0085] It is understandable that the load represented by the third theoretical load parameter is greater than the load represented by the second theoretical load parameter because the third theoretical load parameter corresponds to the case where only the electronic pump is working, while the second theoretical load parameter corresponds to the case where both the electronic pump and the mechanical pump are working.

[0086] In some possible implementations, the lubricating oil cooling system can be applied to hybrid vehicles, specifically for cooling the vehicle's transmission. The mechanical pump of the lubricating oil cooling system is connected to the vehicle's engine, and the load of the electric pump is represented by the cross-axis current. Therefore, in pure electric (EV) mode, the cross-axis current 3 corresponding to the third theoretical load parameter can be used to determine whether the lubricating oil cooling system is experiencing a short-oil fault. In hybrid mode, the cross-axis current 2 corresponding to the second theoretical load parameter and the cross-axis current 1 corresponding to the first theoretical load parameter can be used to determine whether the lubricating oil cooling system is experiencing a short-oil fault or a mechanical pump fault.

[0087] Specifically, the processing logic of the fault monitoring device can be as follows: Figure 3As shown in the diagram. The values ​​of quadrature-axis current 3 and quadrature-axis current 1 can be obtained based on the actual flow parameters of the electronic pump. The value of quadrature-axis current 2 can be obtained based on preset flow parameters. Furthermore, the value of quadrature-axis current 3 is greater than the value of quadrature-axis current 2, and the value of quadrature-axis current 2 is less than the value of quadrature-axis current 1. This allows for comprehensive monitoring of faults in the lubricating oil cooling system.

[0088] The above describes some specific implementations of the fault monitoring method provided in this application. Based on this, this application also provides a corresponding fault monitoring device. The fault monitoring device provided in this application will be described below from the perspective of functional modularity.

[0089] See Figure 4 , Figure 4 This is a schematic diagram of a fault monitoring device provided in an embodiment of this application. Specifically, Figure 4 The fault monitoring device 400 shown includes:

[0090] The acquisition unit 410 is used to acquire the flow parameters and actual load parameters of the electronic pump in response to the electronic pump being in a working state.

[0091] Theoretical load determination unit 420 is used to determine the first theoretical load parameter of the electronic pump based on the flow parameters of the electronic pump in response to the mechanical pump being in operation.

[0092] The fault determination unit 430 is used to determine that the mechanical pump has malfunctioned if the load represented by the actual load parameter is less than the load represented by the first theoretical load parameter.

[0093] In some possible implementations, the theoretical load determination unit 420 is further configured to, in response to the mechanical pump being in operation, determine a second theoretical load parameter of the electronic pump based on the flow parameters of the electronic pump, wherein the load represented by the second theoretical load parameter is less than the load represented by the first theoretical load parameter; the fault judgment unit 430 is specifically configured to, if the load represented by the actual load parameter is less than the load represented by the second theoretical load parameter, determine that the lubricating oil cooling system has an oil shortage fault; if the load represented by the actual load parameter is greater than the load represented by the second theoretical load parameter but less than the load represented by the first theoretical load parameter, determine that the mechanical pump has a fault.

[0094] In some possible implementations, the theoretical load determination unit 420 is further configured to determine a third theoretical load parameter of the electronic pump based on the flow parameter in response to the mechanical pump being in a non-operating state; the fault judgment unit 430 is further configured to determine that the lubricating oil cooling system has an oil shortage fault if the load represented by the actual load parameter is less than the load represented by the third theoretical load parameter.

[0095] In some possible implementations, the device further includes a control unit for controlling the electronic pump to operate according to a preset flow parameter in response to the electronic pump being in a non-operating state; the first theoretical load parameter is a preset theoretical load parameter of the electronic pump under the flow parameter.

[0096] In some possible implementations, the actual load parameter includes the actual quadrature-axis current of the electronic pump, and the first theoretical load parameter includes the theoretical quadrature-axis current of the electronic pump; the theoretical load determination unit 420 is specifically used to determine the theoretical quadrature-axis current corresponding to the flow rate parameter according to a preset correspondence, wherein the preset correspondence is the variation law of the quadrature-axis current of the electronic pump with the flow rate parameter obtained by testing under the fault-free operating condition of the lubricating oil cooling system.

[0097] This application also provides corresponding control equipment, lubricating oil cooling systems, vehicles, computer storage media, and computer program products to implement the technical solutions provided in this application.

[0098] The control device includes a memory and a processor. The memory is used to store instructions or code, and the processor is used to execute the instructions or code stored in the memory so that the device performs the fault monitoring method described in any embodiment of this application.

[0099] The lubricating oil cooling system includes an electronic pump, a mechanical pump, and a lubricating oil storage device. The electronic pump and the mechanical pump are used to pump lubricating oil from the lubricating oil storage device so as to use the lubricating oil to cool and lubricate the device to be cooled. The lubricating oil cooling system also includes the fault monitoring device described in any embodiment of this application.

[0100] The vehicle, as Figure 1 The lubricating oil cooling system shown.

[0101] The computer storage medium stores code, and when the code is executed, the device running the code implements the fault monitoring method described in any embodiment of this application.

[0102] The computer program product contains instructions. When run on a computer, it causes the computer to perform the fault monitoring method described in any embodiment of this application.

[0103] In the embodiments of this application, the terms "first" and "second" (if they exist) are used only as name identifiers and do not represent the order of first and second.

[0104] As can be seen from the above description of the embodiments, those skilled in the art can clearly understand that all or part of the steps in the methods of the above embodiments can be implemented by means of software plus a general-purpose hardware platform. Based on this understanding, the technical solution of this application can be embodied in the form of a software product. This computer software product can be stored in a storage medium, such as a read-only memory (ROM) / RAM, magnetic disk, optical disk, etc., including several instructions to cause a computer device (which may be a personal computer, a server, or a network communication device such as a router) to execute the methods described in various embodiments or some parts of the embodiments of this application.

[0105] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on its differences from other embodiments. In particular, the apparatus embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without creative effort.

[0106] The above description is merely an exemplary implementation of this application and is not intended to limit the scope of protection of this application.

Claims

1. A fault monitoring method for a lubricating oil cooling system, characterized in that, The lubricating oil cooling system includes an electronic pump, a mechanical pump, and a lubricating oil storage device. The electronic pump and the mechanical pump are used to pump lubricating oil from the lubricating oil storage device so as to use the lubricating oil to cool and lubricate the device to be cooled. The method includes: In response to the electronic pump being in operation, the flow rate parameters and actual load parameters of the electronic pump are acquired; In response to the mechanical pump being in operation, the first theoretical load parameter of the electronic pump is determined based on the flow parameters of the electronic pump; If the load represented by the actual load parameter is less than the load represented by the first theoretical load parameter, it is determined that the mechanical pump has failed. The first theoretical load parameter represents the load of the electronic pump when the flow rate of the electronic pump matches the flow rate parameter, assuming that both the electronic pump and the mechanical pump are working normally.

2. The method according to claim 1, characterized in that, After obtaining the flow parameters and actual load parameters of the electronic pump, the method further includes: In response to the mechanical pump being in operation, a second theoretical load parameter of the electronic pump is determined based on the flow parameters of the electronic pump, wherein the load represented by the second theoretical load parameter is less than the load represented by the first theoretical load parameter. If the load represented by the actual load parameter is less than the load represented by the second theoretical load parameter, it is determined that the lubricating oil cooling system has an oil shortage fault. The step of determining that the mechanical pump has malfunctioned if the load represented by the actual load parameter is less than the load represented by the first theoretical load parameter includes: If the load represented by the actual load parameter is greater than the load represented by the second theoretical load parameter but less than the load represented by the first theoretical load parameter, the mechanical pump is determined to be faulty.

3. The method according to claim 1, characterized in that, After obtaining the flow parameters and actual load parameters of the electronic pump, the method further includes: In response to the mechanical pump being in a non-operating state, a third theoretical load parameter of the electronic pump is determined based on the flow rate parameter; If the load represented by the actual load parameter is less than the load represented by the third theoretical load parameter, it is determined that the lubricating oil cooling system has an oil shortage fault.

4. The method according to claim 1, characterized in that, Before obtaining the actual load parameters, the method further includes: In response to the electronic pump being in a non-operating state, the electronic pump is controlled to operate according to the preset flow parameters; the first theoretical load parameter is a preset theoretical load parameter of the electronic pump under the flow parameters.

5. The method according to any one of claims 1-4, characterized in that, The actual load parameters include the actual quadrature-axis current of the electronic pump, and the first theoretical load parameters include the theoretical quadrature-axis current of the electronic pump. Determining the first theoretical load parameter of the electronic pump based on its flow rate parameter includes: Based on a preset correspondence, the theoretical quadrature-axis current corresponding to the flow rate parameter is determined. The preset correspondence is the variation law of the quadrature-axis current of the electronic pump with the flow rate parameter obtained by testing under the fault-free operating condition of the lubricating oil cooling system.

6. A fault monitoring device for a lubricating oil cooling system, characterized in that, The lubricating oil cooling system includes an electronic pump, a mechanical pump, and a lubricating oil storage device. The electronic pump and the mechanical pump are used to pump lubricating oil from the lubricating oil storage device so as to use the lubricating oil to cool and lubricate the device to be cooled. The device includes: The acquisition unit is used to acquire the flow parameters and actual load parameters of the electronic pump in response to the electronic pump being in a working state. Theoretical load determination unit is used to determine the first theoretical load parameter of the electronic pump based on the flow parameters of the electronic pump in response to the mechanical pump being in operation. The fault determination unit is used to determine that the mechanical pump has failed if the load represented by the actual load parameter is less than the load represented by the first theoretical load parameter. The first theoretical load parameter represents the load of the electronic pump when the flow rate of the electronic pump matches the flow rate parameter, assuming that both the electronic pump and the mechanical pump are working normally.

7. The apparatus according to claim 6, characterized in that, The theoretical load determination unit is further configured to, in response to the mechanical pump being in operation, determine a second theoretical load parameter of the electronic pump based on the flow parameters of the electronic pump, wherein the load represented by the second theoretical load parameter is less than the load represented by the first theoretical load parameter. The fault determination unit is specifically used to determine that the lubricating oil cooling system has an oil shortage fault if the load represented by the actual load parameter is less than the load represented by the second theoretical load parameter; and to determine that the mechanical pump has a fault if the load represented by the actual load parameter is greater than the load represented by the second theoretical load parameter but less than the load represented by the first theoretical load parameter.

8. A control device, characterized in that, The control device includes a memory and a processor, the memory being used to store instructions or code, and the processor being used to execute the instructions or code stored in the memory to implement the method as described in any one of claims 1-5.

9. A vehicle, characterized in that, The vehicle includes a lubricating oil cooling system, which includes an electric pump, a mechanical pump, and a lubricating oil storage device. The electric pump and the mechanical pump are used to pump lubricating oil from the lubricating oil storage device so as to use the lubricating oil to cool and lubricate the components to be cooled. The vehicle also includes the control device as described in claim 8.

10. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is run by the processor, the processor performs the method according to any one of claims 1-5.

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