Fault monitoring method and device for lubricating oil cooling system and related equipment

Abstract

The invention provides a fault monitoring method and device for a lubricating oil cooling system and related equipment. For a lubricating oil cooling system comprising an electronic pump, a mechanical pump and lubricating oil storage equipment, whether the mechanical pump breaks down or not can be judged according to the working parameters of the electronic pump, and therefore comprehensive fault monitoring on the lubricating oil cooling system is achieved. Specifically, if the electronic pump is in a working state, a flow parameter and an actual load parameter of the electronic pump can be obtained. If the mechanical pump is also in a working state, a first theoretical load parameter of the electronic pump can be determined according to a flow parameter of the electronic pump. The first theoretical load parameter represents the load condition of the electronic pump when the flow of the electronic pump is matched with the flow parameter under the condition that both the electronic pump and the mechanical pump work normally. If the load represented by the actual load parameter is smaller than the load represented by the first theoretical load parameter, it can be determined that the mechanical pump breaks down.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, in particular to a fault monitoring method and device of a lubricating oil cooling system and related equipment. BACKGROUND

[0002] The lubricating oil cooling system, also known as the oil cooling system, is a system for cooling and lubricating devices by using lubricating oil. Since the lubricating oil as the cooling medium is mostly below the point, the oil cooling scheme can perform immersion cooling on the electrified devices, and has higher cooling efficiency. For example, as the power of the motor rises, the traditional air cooling system and water cooling system may not be able to meet the demand for cooling the motor, and the oil cooling needs to be used to cool the devices such as the motor and the gearbox.

[0003] In some scenarios, the lubricating oil cooling system can include a mechanical pump and an electronic pump. When the lubricating oil cooling system is working, the electronic pump and the mechanical pump can pump out lubricating oil for cooling at the same time. The power source of the mechanical pump is a device such as an engine or a motor. The power source of the electronic pump is a motor in the electronic pump. By adjusting the working parameters of the motor, the flow of the electronic pump can be controlled to achieve the effect of adjusting the oil pumping amount of the lubricating oil cooling system.

[0004] However, the power source of the mechanical pump is a device outside the lubricating oil cooling system, so there is usually no sensor on the mechanical pump to monitor the failure of the mechanical pump. SUMMARY

[0005] Therefore, the present application provides a fault monitoring method and device of a lubricating oil cooling system and related equipment, aiming to improve the comprehensive fault monitoring of the lubricating oil cooling system.

[0006] In a first aspect, the present application provides a fault monitoring method of 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 out lubricating oil from the lubricating oil storage device to cool and lubricate the devices to be cooled by using the lubricating oil;

[0007] The method includes:

[0008] In response to the electronic pump being in a working state, acquiring a flow parameter and an actual load parameter of the electronic pump;

[0009] In response to the mechanical pump being in a working state, determining a first theoretical load parameter of the electronic pump according to the flow parameter 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, it is determined that the mechanical pump has a failure.

[0011] In some possible implementation manners, after the flow parameter and the actual load parameter of the electronic pump are acquired, the method further includes:

[0012] in response to the mechanical pump being in the working state, determining a second theoretical load parameter of the electronic pump according to the flow parameter of the electronic pump, the load represented by the second theoretical load parameter being smaller than the load represented by the first theoretical load parameter;

[0013] if the load represented by the actual load parameter is smaller than the load represented by the second theoretical load parameter, determining that the lubricating oil cooling system has an oil shortage fault;

[0014] the determining that the mechanical pump has a fault if the load represented by the actual load parameter is smaller 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 and smaller than the load represented by the first theoretical load parameter, determining that the mechanical pump has a fault.

[0016] In some possible implementation manners, after the flow parameter and the actual load parameter of the electronic pump are acquired, the method further includes:

[0017] in response to the mechanical pump being in the non-working state, determining a third theoretical load parameter of the electronic pump according to the flow parameter;

[0018] if the load represented by the actual load parameter is smaller than the load represented by the third theoretical load parameter, determining that the lubricating oil cooling system has an oil shortage fault.

[0019] In some possible implementation manners, before the actual load parameter is acquired, the method further includes:

[0020] in response to the electronic pump being in the non-working state, controlling the electronic pump to work according to a preset flow parameter; the first theoretical load parameter is preset, and the flow parameter is a theoretical load parameter of the electronic pump.

[0021] In some possible implementation manners, the actual load parameter includes an actual cross-axis current of the electronic pump, and the first theoretical load parameter includes a theoretical cross-axis current of the electronic pump.

[0022] the determining the first theoretical load parameter of the electronic pump according to the flow parameter of the electronic pump includes:

[0023] According to a preset correspondence relationship, a theoretical cross-axis current corresponding to the flow parameter is determined, the preset correspondence relationship being a variation law of the cross-axis current of the electronic pump with the flow parameter obtained by testing under a working condition in which the lubricating oil cooling system is fault-free.

[0024] In a second aspect, the present application provides a fault monitoring device of a lubricating oil cooling system, the lubricating oil cooling system comprising an electronic pump, a mechanical pump and a lubricating oil storage device, the electronic pump and the mechanical pump being configured to pump lubricating oil from the lubricating oil storage device so as to cool and lubricate devices to be cooled using the lubricating oil.

[0025] The device comprises:

[0026] An acquisition unit configured to acquire a flow parameter and an actual load parameter of the electronic pump in response to the electronic pump being in a working state.

[0027] A theoretical load determination unit configured to determine a first theoretical load parameter of the electronic pump according to the flow parameter of the electronic pump in response to the mechanical pump being in a working state.

[0028] A fault judgment unit configured to determine that the mechanical pump is faulty 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 implementation manners, the theoretical load determination unit is further configured to determine a second theoretical load parameter of the electronic pump according to the flow parameter of the electronic pump in response to the mechanical pump being in a working state, the load represented by the second theoretical load parameter being less than the load represented by the first theoretical load parameter; and the fault judgment unit is specifically configured to determine that the lubricating oil cooling system is in 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 determine that the mechanical pump is faulty if the load represented by the actual load parameter is greater than the load represented by the second theoretical load parameter and less than the load represented by the first theoretical load parameter.

[0030] In some possible implementation manners, the theoretical load determination unit is further configured to determine a third theoretical load parameter of the electronic pump according to the flow parameter in response to the mechanical pump being in a non-working state; and the fault judgment unit is further configured to determine that the lubricating oil cooling system is in 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 implementation manners, the device further includes a control unit, configured to control the electronic pump to work according to a preset flow parameter in response to the electronic pump being in a non-working state; the first theoretical load parameter is preset, and the theoretical load parameter of the electronic pump under the flow parameter.

[0032] In some possible implementation manners, the actual load parameter includes an actual cross-axis current of the electronic pump, and the first theoretical load parameter includes a theoretical cross-axis current of the electronic pump; and the theoretical load determination unit is specifically configured to determine the theoretical cross-axis current corresponding to the flow parameter according to a preset corresponding relationship, the preset corresponding relationship being a variation law of the cross-axis current of the electronic pump with the flow parameter obtained by testing under a working condition in which the lubricating oil cooling system is fault-free.

[0033] In a third aspect, the present application provides a control device, including a memory and a processor, the memory is configured to store instructions or codes, and the processor is configured to execute the instructions or codes stored in the memory to implement the method according to any one of the preceding first aspect.

[0034] In a fourth aspect, the present application provides a 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 configured to pump lubricating oil from the lubricating oil storage device to cool and lubricate devices to be cooled by using the lubricating oil; the lubricating oil cooling system further includes the control device according to the third aspect.

[0035] In a fifth aspect, the present application provides a vehicle, including the lubricating oil cooling system according to the fourth aspect.

[0036] In a sixth aspect, the present application provides a computer storage medium, in which a code is stored, when the code is executed, a device executing the code implements the method according to any one of the preceding first aspect.

[0037] In a seventh aspect, a computer program product including instructions is provided, when the computer program product is executed on a computer, the computer is caused to execute the method according to any one of the preceding first aspect.

[0038] The application provides a failure monitoring method and device for a lubricating oil cooling system and related equipment. For a lubricating oil cooling system including an electronic pump, a mechanical pump and a lubricating oil storage device, whether the mechanical pump is faulty can be determined by the working parameters of the electronic pump, so as to realize comprehensive failure monitoring of the lubricating oil cooling system. Specifically, if the electronic pump is in a working state, the flow parameter and the actual load parameter of the electronic pump can be acquired. If the mechanical pump is also in a working state, the first theoretical load parameter of the electronic pump can be determined according to the flow parameter of the electronic pump. The first theoretical load parameter represents the load condition of the electronic pump when the flow of the electronic pump matches the flow parameter under the condition that the electronic pump and the mechanical pump are both in normal working states. If the load represented by the actual load parameter is less than the load represented by the first theoretical load parameter, it indicates that the current load of the electronic pump is less than the load when the mechanical pump is in normal working state. Since the first theoretical load parameter and the actual load parameter correspond to the same flow parameter, it indicates that the pressure difference between the outlet and the inlet of the electronic pump is less than the pressure difference between the outlet and the inlet of the electronic pump when the mechanical pump is in normal working state. Therefore, it can be inferred that the pressure difference actually provided by the mechanical pump is less than the pressure difference provided by the mechanical pump when the mechanical pump is in normal working state, so that it is determined that the mechanical pump is faulty. In this way, based on the corresponding relationship between the flow and the load of the electronic pump, whether the pressure difference provided by the mechanical pump is less than the pressure difference provided by the mechanical pump when the mechanical pump is in normal working state is deduced reversely, so that whether the mechanical pump is faulty is determined, and comprehensive failure monitoring of the lubricating oil cooling system is realized. BRIEF DESCRIPTION OF DRAWINGS

[0039] To make the technical solutions in the embodiments or the prior art clearer, the accompanying drawings needed in the embodiments or the prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description are only some embodiments of the application, and other accompanying drawings can be obtained by those skilled in the art without any creative effort.

[0040] Figure 1 A structural schematic diagram of a lubricating oil cooling system provided by the embodiments of the application;

[0041] Figure 2 A flow schematic diagram of a failure monitoring method provided by the embodiments of the application;

[0042] Figure 3 Another flow schematic diagram of a failure monitoring method provided by the embodiments of the application;

[0043] Figure 4 A structural schematic diagram of a failure monitoring device provided by the embodiments of the application. DETAILED DESCRIPTION

[0044] The lubricating oil cooling system can include an electronic pump and / or a mechanical pump. The mechanical pump can also be referred to as a mechanical oil pump (MOP), which is powered from outside the lubricating oil cooling system. For example, the lubricating oil cooling system is installed on a vehicle, and the input shaft of the mechanical pump can be connected to the main shaft of an engine or an electric motor to obtain power from the engine. The electronic pump can also be referred to as an electronic oil pump (EOP), which is powered from the electronic pump itself, for example, from the motor of the electronic pump.

[0045] A high-power electronic pump tends to have a high cost. Therefore, some lubricating oil cooling systems can use both an electronic pump and a mechanical pump. A part of the flow is provided by the mechanical pump, and another part of the flow is provided by the electronic pump. In this way, the power requirement of the electronic pump is reduced, and the amount of pumped oil can be flexibly adjusted by the electronic pump.

[0046] In order to ensure the normal operation of the electronic pump, a plurality of sensors can be deployed on the electronic pump to detect parameters in the working process of the electronic pump, and the failure of the electronic pump can be found in time. However, the mechanical pump often does not have sensors for failure monitoring. If the mechanical pump fails, the existing lubricating oil cooling system cannot find the failure in time.

[0047] Therefore, the embodiments of the present application provide a failure monitoring method of a lubricating oil cooling system. The method can be applied to a lubricating oil cooling system including an electronic pump, a mechanical pump, and a lubricating oil storage device. The method can infer the working condition of the mechanical pump according to the working parameters of the electronic pump, so as to determine whether the mechanical pump is working normally, and achieve the purpose of failure monitoring.

[0048] In order to facilitate the description, the application scenario and principle of the failure monitoring method are first introduced.

[0049] Specifically, referring to Figure 1 , the figure is a structural schematic diagram of a lubricating oil cooling system provided by the embodiments of the present application. In Figure 1 , the application scenario shown includes a lubricating oil cooling system 110, an engine 120, and a gearbox 130. The gearbox 130 is a component to be cooled, and the engine 120 is used to provide power for the mechanical pump 111 in the lubricating oil cooling system 110.

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

[0051] The mechanical pump 111 and the electric pump 112 can draw lubricating oil from the lubricating oil storage device 113, respectively, and deliver the lubricating oil to the transmission 130 through a common oil passage, thereby lubricating and cooling the transmission 130. The lubricating oil cooling system 110 can further include a cooling device (not shown in the figure) for cooling the lubricating oil. Figure 1 Figure 1 The arrow direction indicates the flow direction of the lubricating oil.

[0052] The present inventors have found that the cross-sectional area of the oil passage of the lubricating oil is substantially constant in the lubricating oil cooling system, and thus the flow rate of the oil passage can be represented by the flow rate of the oil passage. The outlet of the mechanical pump 111 and the outlet of the electric pump 112 join the same oil passage, and thus the sum of the flow rates of the oil passages can be equal to the flow rate of the mechanical pump 111 and the flow rate of the electric pump 112.

[0053] That is, if both the mechanical pump 111 and the electric pump 112 are operating normally, the mechanical pump 111 and the electric pump 112 pump lubricating oil into the oil passage, respectively, and the flow rate of the lubricating oil in the oil passage is large, the flow rate is large, and the pressure is small. If the pressure of the lubricating oil in the lubricating oil storage device 113 is considered constant, the electric pump 112 needs to overcome a large pressure difference to pump the lubricating oil from the lubricating oil storage device 113 into the oil passage. Thus, the load of the electric pump 112 is large.

[0054] If the mechanical pump 111 is not operating normally, the mechanical pump 111 cannot pump lubricating oil from the lubricating oil storage device 113 into the oil passage, or the flow rate of the lubricating oil pumped from the lubricating oil storage device 113 into the oil passage is less than the normal flow rate. Thus, compared to the case where the mechanical pump 111 is operating normally, the flow rate of the lubricating oil in the oil passage decreases, the flow rate decreases, and the pressure increases. In this way, since the pressure of the oil passage increases, the electric pump 112 needs to overcome a smaller pressure difference to pump the lubricating oil from the lubricating oil storage device 113 into the oil passage, and thus the load of the electric pump 112 is small.

[0055] That is, the load of the electric pump 112 decreases as the mechanical pump 111 fails, and thus the failure of the mechanical pump 111 can be determined by the load of the electric pump.

[0056] In addition, the lubricating oil cooling system 100 can also have a low-oil failure. The low-oil failure refers to a failure in which the amount of lubricating oil in the oil passage and the lubricating oil storage device 113 is insufficient. In the case of a low-oil failure, there is not enough lubricating oil in the lubricating oil storage device 113 for the electric pump 112 to pump out, and thus the amount of lubricating oil pumped out by the electric pump 112 per unit time is less than the amount of lubricating oil that should be pumped out in theory. In this way, the load of the electric pump also decreases. Furthermore, since there is not enough lubricating oil entering the electric pump, the low-oil failure causes the load of the electric pump to decrease to a greater extent than the failure of the mechanical pump.​

[0057] The application scenarios and principles of the present application are introduced above. The lubricating oil cooling system fault monitoring method provided by the embodiments of the present application is described below from the perspective of a fault monitoring device. The fault monitoring device is a software module for monitoring faults of 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 run in the controller of the lubricating oil cooling system or the vehicle controller, for example, in the control device 114 in the illustrated embodiment. Figure 1

[0058] Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0059] Referring to Figure 2 , Figure 2 A method flowchart of the lubricating oil cooling system fault monitoring method provided by the embodiments of the present application includes the following steps.

[0060] S201: In response to the electronic pump being in a working state, acquiring a flow parameter and an actual load parameter of the electronic pump.

[0061] As known from the foregoing description, the fault monitoring device can determine whether the mechanical pump has a fault and whether there is an oil shortage fault according to the load of the electronic pump when the electronic pump is working. In order to achieve the purpose of fault monitoring, the fault monitoring device can acquire the flow parameter and the actual load parameter of the electronic pump when the electronic pump is in a working state.

[0062] The flow parameter of the electronic pump is used to indicate the pumping of the lubricating oil by the electronic pump, for example, can include the flow of the lubricating oil pumped from the lubricating oil storage device by the electronic pump per unit time. The actual load parameter of the electronic pump represents the actual load of the electronic pump, for example, can include the power data of the electronic pump. In some possible implementation manners, the actual load parameter of the electronic pump can also include the actual Q-axis current of the electronic pump, i.e., the Q-axis current of the electronic pump. For example, if the electronic pump is driven by a synchronous motor, the actual load parameter of the electronic pump can include the actual Q-axis current of the electronic pump. Correspondingly, the theoretical load parameter described below can be a theoretical Q-axis current.

[0063] In some possible implementation manners, the electronic pump can be in a non-working state. In this way, the fault monitoring device cannot determine whether the lubricating oil cooling system has a fault according to the load of the electronic pump. Then, in order to achieve the purpose of fault monitoring, the fault monitoring device can start the electronic pump.

[0064] ​Specifically, the fault monitoring device can store preset flow parameters. When there is a need for fault monitoring but the electronic pump is in a non-working state, the fault monitoring device can control the electronic pump to work according to the preset flow parameters, and collect actual load parameters of the electronic pump working according to the preset flow parameters. In this way, by actively controlling the electronic pump to work, fault monitoring can be performed when the electronic pump is in a non-working state, improving the comprehensiveness of fault monitoring.

[0065] If the flow of the electronic pump is unstable, it can cause deviation in the result of fault monitoring. Alternatively, fault monitoring can be performed under a working condition in which the flow of the electronic pump is relatively stable. That is, the fault monitoring device can determine the flow parameter of the electronic pump to be stable before performing subsequent steps.

[0066] S202: In response to the mechanical pump being in a working state, determining a first theoretical load parameter of the electronic pump according to the flow parameter of the electronic pump.

[0067] As known from the foregoing, the fault monitoring device can determine whether the mechanical pump is faulty according to the load of the electronic pump when the electronic pump is working. If the mechanical pump is in a non-working state, the fault monitoring device cannot determine whether the mechanical pump is faulty. If the mechanical pump is in a working state, the fault monitoring device can determine a first theoretical load parameter of the electronic pump according to the obtained flow parameter of the electronic pump.

[0068] The first theoretical load parameter corresponds to the flow parameter of the electronic pump, and represents the load condition of the electronic pump working according to the flow parameter when the lubricating oil cooling device is not faulty. Alternatively, if the actual load parameter includes the actual cross-axis current of the electronic pump, the first theoretical load parameter can also include a theoretical cross-axis current. If the actual cross-axis current of the electronic pump is less than the theoretical cross-axis current, it can be considered that the load of the electronic pump is less than the load when the mechanical pump is working normally, thereby determining that the mechanical pump is faulty.

[0069] Alternatively, for the sake of accuracy of the determination, the determination can be performed under a working condition in which the mechanical pump has a high speed. For example, if the mechanical pump is connected to an output shaft of an engine, the fault monitoring can be performed again when the engine speed is greater than a preset speed. Alternatively, the preset speed can be, for example, 1500 revolutions per minute (rpm).

[0070] Some implementation manners of determining the first theoretical load parameter will be described below by taking the load parameter including the cross-axis current as an example.

[0071] To determine the quadrature current corresponding to the first theoretical load parameter, the variation of the quadrature current of the electronic pump of the lubricating oil cooling system in a fault-free working condition with the flow parameter of the electronic pump can be tested in advance in an experimental environment. Specifically, a test environment can be first built, and it is ensured that the lubricating oil cooling system in the test environment is fault-free. Then, the mechanical pump and the electronic pump in the lubricating oil cooling system are started, the flow parameter of the electronic pump is adjusted, and the correspondence between the flow parameter of the electronic pump and the quadrature current is recorded. The correspondence can be preset in the fault monitoring device. In this way, when the fault monitoring device performs fault monitoring, the theoretical quadrature current corresponding to the flow parameter can be determined according to the preset correspondence, and the first theoretical load parameter is obtained.

[0072] Alternatively, the correspondence can be directly obtained according to the tested quadrature current, or the quadrature current can be corrected, and the correspondence between the corrected quadrature current and the flow parameter can be preset to the fault monitoring device. Specifically, considering that there can be errors in actual application scenarios, the quadrature current corresponding to the flow parameter can be adaptively reduced. For example, the tested quadrature current can be subtracted by a preset correction value, and a correspondence between the result obtained by the subtraction and the flow parameter is established. In this way, by correcting the quadrature current through the correction value, the fault monitoring device can be prevented from misdiagnosis.

[0073] In actual scenarios, the viscosity of the lubricating oil can be affected by the temperature. At different viscosities, the power required by the electronic pump to pump the same flow can be different. Therefore, the first theoretical load parameter can also be related to the temperature. In this way, not only the influence of the flow on the load of the electronic pump is considered, but also the influence of the temperature on the load of the electronic pump is considered. In this way, the influence of the temperature on the fault monitoring result is avoided, and the fault monitoring can be more accurate.

[0074] That is, the above-mentioned preset correspondence can include the association relationship among the temperature, the flow parameter and the quadrature current. Alternatively, the quadrature current of the electronic pump at different flows under different temperatures can be tested respectively in a fault-free use environment to obtain the correspondence. Similarly, the second theoretical load parameter described below can also be obtained by a similar method, which will not be described here.

[0075] S203: If the load represented by the actual load parameter is smaller than the load represented by the first theoretical load parameter, it is determined that the mechanical pump is faulty.

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

[0077] Thus, based on the correspondence between the flow of the electronic pump and the load, it is deduced whether the pressure difference provided by the mechanical pump is less than the pressure difference provided during normal operation, so as to determine whether the mechanical pump is malfunctioning, thereby achieving comprehensive fault monitoring of the lubricating oil cooling system.

[0078] Optionally, after determining that the mechanical pump is malfunctioning, in order to ensure that the device to be cooled can be normally cooled and lubricated, the flow of the electronic pump can be increased to compensate for the flow provided by the malfunctioning mechanical pump. And / or, the heat generation of the lubricated component can also be limited. For example, if the lubricated component is a transmission of a hybrid vehicle, the output power of the electric motor and / or the engine can be limited.

[0079] As introduced above, the lubricating oil cooling system can also have an oil shortage fault. The oil shortage fault causes the load of the electronic pump to decrease to a greater extent than the malfunction of the mechanical pump. Therefore, before determining whether the mechanical pump is malfunctioning based on the load parameter of the electronic pump, it can be determined first whether the decrease of the load of the electronic pump is caused by an oil shortage fault of the lubricating oil cooling device.

[0080] Specifically, after obtaining the flow parameter and the load parameter of the electronic pump, if the mechanical pump is in a working state, the fault monitoring device can also determine a second theoretical load parameter of the electronic pump according to the flow parameter of the electronic pump. The second theoretical load parameter represents the minimum load of the electronic pump under the flow parameter when the lubricating oil cooling system does not have an oil shortage fault and the electronic pump and the mechanical pump are both in a normal working state. If the load represented by the actual load parameter 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.

[0081] Optionally, after determining that the lubricating oil cooling system has an oil shortage fault, in order to ensure that the device to be cooled can be cooled and lubricated in time, the heat generation of the lubricated component can also be limited. For example, if the lubricated component is a transmission of a hybrid vehicle, the output power of the electric motor and / or the engine can be limited.

[0082] It can be understood that the degree of influence of the oil shortage fault on the load of the electric pump is greater than the degree of influence of the mechanical pump fault on the load of the electric pump. Therefore, the load of the electric pump represented by the second theoretical load parameter is smaller than the load of the electric pump represented by the first theoretical load parameter. That is, if the actual load of the electric pump is smaller 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 smaller than the load represented by the second theoretical load parameter and smaller 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 a fault. If the actual load of the electric pump is not smaller than the load represented by the first theoretical load parameter, it can be determined that the lubricating oil cooling system neither has an oil shortage fault nor has a mechanical pump fault.

[0083] Further, the load of the electric pump can also be used to determine whether the lubricating oil cooling system has an oil shortage fault when the mechanical pump is not in the working state.

[0084] Specifically, if the electric pump is in the working state and the mechanical pump is in the non-working state, the fault monitoring device can determine a third theoretical load parameter of the electric pump according to the flow parameter of the electric pump. The third theoretical load parameter represents the minimum load of the electric pump under the flow parameter when the lubricating oil cooling system does not have an oil shortage fault and only the electric pump works. If the load represented by the actual load parameter is smaller than the load represented by the third theoretical load parameter, it indicates that there is not enough lubricating oil in the lubricating oil storage device for the electric pump to pump out.

[0085] It can be understood 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 electric pump works, and the second theoretical load parameter corresponds to the case where the electric pump and the mechanical pump work together.

[0086] In some possible implementation manners, the lubricating oil cooling system can be applied to a hybrid vehicle and can be specifically used for cooling a transmission of the vehicle. Moreover, the mechanical pump of the lubricating oil cooling system is connected with an engine of the vehicle, and the load of the electric pump is represented by the cross-axis current. Then, whether the lubricating oil cooling system has an oil shortage fault can be determined based on the cross-axis current 3 corresponding to the third theoretical load parameter when the vehicle is in an electric vehicle (EV) mode. Whether the lubricating oil cooling system has an oil shortage fault and a mechanical pump fault can be determined based on 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 when the vehicle is in a hybrid mode.

[0087] Specifically, the processing logic of the fault monitoring device can be as follows: Figure 3The value of the quadrature axis current 3 and the value of the quadrature axis current 1 can be obtained according to the actual flow parameter of the electronic pump. The value of the quadrature axis current 2 can be obtained according to the preset flow parameter. Moreover, the value of the quadrature axis current 3 is greater than the value of the quadrature axis current 2, and the value of the quadrature axis current 2 is less than the value of the quadrature axis current 1. In this way, the failure of the lubricating oil cooling system can be comprehensively monitored.

[0088] The above is some specific implementation manners of the failure monitoring method provided by the embodiments of the present application. Based on this, the present application also provides a corresponding failure monitoring device. The failure monitoring device provided by the embodiments of the present application will be introduced from the perspective of functional modularization.

[0089] Referring to Figure 4 , Figure 4 A structural schematic diagram of the failure monitoring device provided by the embodiments of the present application is shown in FIG. 4. Specifically, Figure 4 The failure monitoring device 400 shown in FIG. 4 includes:

[0090] An acquisition unit 410, configured to acquire a flow parameter and an actual load parameter of the electronic pump in response to the electronic pump being in a working state.

[0091] A theoretical load determination unit 420, configured to determine a first theoretical load parameter of the electronic pump according to the flow parameter of the electronic pump in response to the mechanical pump being in a working state.

[0092] A failure judgment unit 430, configured to determine that the mechanical pump has a failure 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 implementation manners, the theoretical load determination unit 420 is further configured to determine a second theoretical load parameter of the electronic pump according to the flow parameter of the electronic pump in response to the mechanical pump being in a working state, and the load represented by the second theoretical load parameter is less than the load represented by the first theoretical load parameter; and the failure judgment unit 430 is specifically configured to determine that the lubricating oil cooling system has an oil shortage failure if the load represented by the actual load parameter is less than the load represented by the second theoretical load parameter, and determine that the mechanical pump has a failure if the load represented by the actual load parameter is greater than the load represented by the second theoretical load parameter and less than the load represented by the first theoretical load parameter.

[0094] In some possible implementation manners, the theoretical load determining unit 420 is further configured to determine a third theoretical load parameter of the electronic pump according to the flow parameter in response to the mechanical pump being in the non-working state; and the fault judging unit 430 is further configured to determine that the lubricating oil cooling system has an oil deficiency fault if the load characterized by the actual load parameter is less than the load characterized by the third theoretical load parameter.

[0095] In some possible implementation manners, the device further includes a control unit configured to control the electronic pump to work according to a preset flow parameter in response to the electronic pump being in the non-working state; and the first theoretical load parameter is preset, and the theoretical load parameter of the electronic pump under the flow parameter.

[0096] In some possible implementation manners, the actual load parameter includes an actual cross-axis current of the electronic pump, and the first theoretical load parameter includes a theoretical cross-axis current of the electronic pump; and the theoretical load determining unit 420 is specifically configured to determine the theoretical cross-axis current corresponding to the flow parameter according to a preset corresponding relationship, the preset corresponding relationship being a variation law of the cross-axis current of the electronic pump with the flow parameter obtained by testing under a working condition in which the lubricating oil cooling system has no fault.

[0097] Embodiments of the present application further provide a corresponding control device, a lubricating oil cooling system, a vehicle, a computer storage medium and a computer program product, for implementing the technical solutions provided by the embodiments of the present application.

[0098] The control device includes a memory and a processor, the memory is configured to store instructions or codes, and the processor is configured to execute the instructions or codes stored in the memory, so that the device executes the fault monitoring method described in any embodiment of the present 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 configured to pump lubricating oil from the lubricating oil storage device, so as to cool and lubricate devices to be cooled by using the lubricating oil; and the lubricating oil cooling system further includes the fault monitoring device described in any embodiment of the present application.

[0100] The vehicle includes the lubricating oil cooling system as shown in any of the above embodiments. Figure 1

[0101] The computer storage medium stores codes, and when the codes are executed, a device executing the codes implements the fault monitoring method described in any embodiment of the present application.

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

[0103] The "first", "second" in the names mentioned in the embodiments of the present application are only used for name identification, and do not represent the first, second in order.

[0104] From the above description of the embodiments, those skilled in the art can clearly understand that all or part of the steps in the above-mentioned embodiment methods can be implemented by means of software plus a general hardware platform. Based on such understanding, the technical solutions of the present application can be embodied in the form of a software product. The computer software product can be stored in a storage medium, such as a read-only memory (English: read-only memory, ROM) / RAM, a magnetic disk, an optical disk, etc., and includes a number of instructions for causing a computer device (which can be a personal computer, a server, or a network communication device such as a router) to execute the method described in each embodiment or some parts of the embodiments of the present application.

[0105] Each of the embodiments in the specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other. Each embodiment focuses on the difference from other embodiments. In particular, for the device embodiments, since they are basically similar to the method embodiments, they are described more simply, and the relevant parts can be referred to the part of the description of the method embodiments. According to the actual needs, some or all of the modules can be selected to achieve the purpose of the present embodiment. Those skilled in the art can understand and implement without creative labor.

[0106] The above is only an exemplary embodiment of the present application, and is not intended to limit the protection scope of the present application.

Claims

1. A method of monitoring for failure of a lubricating oil cooling system, characterized by, The lubricating oil cooling system comprises 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 cool and lubricate devices to be cooled using the lubricating oil; The method comprises: in response to the electronic pump being in an operating state, acquiring a flow parameter and an actual load parameter of the electronic pump; in response to the mechanical pump being in an operating state, determining a first theoretical load parameter of the electronic pump according to the flow parameter 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, determining that the mechanical pump is faulty.

2. The method of claim 1, wherein, After acquiring the flow parameter and the actual load parameter of the electronic pump, the method further comprises: in response to the mechanical pump being in an operating state, determining a second theoretical load parameter of the electronic pump according to the flow parameter of the electronic pump, the load represented by the second theoretical load parameter being 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, determining that the lubricating oil cooling system is out of oil; the if the load represented by the actual load parameter is less than the load represented by the first theoretical load parameter, determining that the mechanical pump is faulty comprises: if the load represented by the actual load parameter is greater than the load represented by the second theoretical load parameter and less than the load represented by the first theoretical load parameter, determining that the mechanical pump is faulty.

3. The method of claim 1, wherein, After acquiring the flow parameter and the actual load parameter of the electronic pump, the method further comprises: in response to the mechanical pump being in a non-operating state, determining a third theoretical load parameter of the electronic pump according to the flow parameter; if the load represented by the actual load parameter is less than the load represented by the third theoretical load parameter, determining that the lubricating oil cooling system is out of oil.

4. The method of claim 1, wherein, Before acquiring the actual load parameter, the method further comprises: in response to the electronic pump being in a non-operating state, controlling the electronic pump to operate according to a preset flow parameter; the first theoretical load parameter is preset, and the theoretical load parameter of the electronic pump under the flow parameter.

5. The method according to any one of claims 1 to 4, characterized in that, the actual load parameter comprises an actual cross-axis current of the electronic pump, and the first theoretical load parameter comprises a theoretical cross-axis current of the electronic pump; the determining the first theoretical load parameter of the electronic pump according to the flow parameter of the electronic pump comprises: determining a theoretical cross-axis current corresponding to the flow parameter according to a preset correspondence relationship, the preset correspondence relationship being a variation law of the cross-axis current of the electronic pump with the flow parameter obtained by testing under a fault-free working condition of the lubricating oil cooling system.

6. A failure monitoring device for a lubricating oil cooling system, characterized by The lubricating oil cooling system comprises 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 cool and lubricate devices to be cooled using the lubricating oil; The device comprises: an acquisition unit, configured to acquire a flow parameter and an actual load parameter of the electronic pump in response to the electronic pump being in an operating state; a theoretical load determination unit, configured to determine a first theoretical load parameter of the electronic pump according to the flow parameter of the electronic pump in response to the mechanical pump being in an operating state; a fault determination unit, configured to determine that the mechanical pump is faulty if the load represented by the actual load parameter is less than the load represented by the first theoretical load parameter.

7. The apparatus of claim 6, wherein the theoretical load determination unit is further configured to determine a second theoretical load parameter of the electronic pump according to the flow parameter of the electronic pump in response to the mechanical pump being in an operating state, the load represented by the second theoretical load parameter being less than the load represented by the first theoretical load parameter; the fault determination unit is specifically configured to determine that the lubricating oil cooling system is out of oil if the load represented by the actual load parameter is less than the load represented by the second theoretical load parameter, and determine that the mechanical pump is faulty if the load represented by the actual load parameter is greater than the load represented by the second theoretical load parameter and less than the load represented by the first theoretical load parameter.

8. A control device characterized by comprising: The control device comprises a memory and a processor, the memory is configured to store instructions or codes, and the processor is configured to execute the instructions or codes stored in the memory to implement the method in any one of claims 1-5.

9. A vehicle characterized by comprising: The vehicle comprises a lubricating oil cooling system, the lubricating oil cooling system comprises an electronic pump, a mechanical pump and a lubricating oil storage device, the electronic pump and the mechanical pump are configured to pump lubricating oil from the lubricating oil storage device to cool and lubricate devices to be cooled using the lubricating oil; The vehicle further comprises the control device in claim 8.

10. A computer readable storage medium storing a computer program, characterized in that, The computer program is run by the processor, and the processor executes the method in any one of claims 1-5.

Images