Method and device for estimating internal oil temperature of vehicle driving device and storage medium

Abstract

The invention provides a vehicle driving device internal oil temperature estimation method and device and a storage medium, and the method comprises the steps: obtaining the inlet cooling water temperature of an oil cooler, the outlet cooling water temperature of the oil cooler, the cooling water flow and the oil flow, and calculating the heat exchange amount in the oil cooler; substituting into an oil cooler heat exchange performance table to obtain the temperature difference between the oil and the cooling water; determining the inlet temperature of the oil cooler according to the inlet cooling water temperature of the oil cooler; and according to the heat exchange capacity, the oil flow and the specific heat capacity of the oil in the oil cooler, the temperature rise of the oil is calculated, and the oil cooler outlet temperature of the oil is determined. By adopting the scheme, the oil temperature can be accurately estimated under the condition that a temperature sensor for measuring lubricating or cooling oil cannot be mounted in the driving device of the vehicle due to certain reasons, so that the performance reduction of the driving device of the vehicle, the aging of electric appliance elements and hidden dangers to driving safety caused by abnormal oil temperature are avoided.

Description

Technical Field

[0001] This application relates to the field of vehicle oil temperature management, and particularly to a method, device, and storage medium for estimating the internal oil temperature of a vehicle drive device. Background Art

[0002] During the operation of a vehicle drive device, it is inevitable for the temperature to rise. Excessive temperature can affect the performance of the vehicle drive device, the aging of electrical components, and pose potential safety hazards for driving. It is necessary to monitor the temperature of the oil for lubrication or cooling inside the vehicle drive device. However, if for reasons such as cost, installation location limitations, and limitations in the number of signal line connector pins, it is not possible to install a temperature sensor for measuring the temperature of the lubricating or cooling oil inside the drive device, it is necessary to accurately estimate the oil temperature and monitor it to avoid a decline in the performance of the vehicle drive device, the aging of electrical components, and potential safety hazards for driving. Summary of the Invention

[0003] This application provides a method, device, and storage medium for estimating the internal oil temperature of a vehicle drive device to solve the above technical problems in the prior art.

[0004] According to the first aspect of this application, there is provided a method for estimating the internal oil temperature of a vehicle drive device, the method including:

[0005] Obtain the inlet cooling water temperature T1 of the oil cooler, the outlet cooling water temperature T2 of the oil cooler, and the cooling water flow rate Q1, and obtain the oil flow rate Q2;

[0006] Calculate the heat exchange amount W in the oil cooler according to the inlet cooling water temperature T1 of the oil cooler, the outlet cooling water temperature T2 of the oil cooler, and the cooling water flow rate Q1;

[0007] Substitute the heat exchange amount W in the oil cooler and the oil flow rate Q2 into the oil cooler heat exchange performance table to obtain the temperature difference △Ta between the oil and the cooling water;

[0008] Determine the inlet temperature T3 of the oil cooler of the oil according to the temperature difference △Ta between the oil and the cooling water and the inlet cooling water temperature T1 of the oil cooler;

[0009] Calculate the temperature rise △Tb of the oil according to the heat exchange amount W in the oil cooler, the oil flow rate Q2, and the heat capacity of the oil;

[0010] Determine the outlet temperature T4 of the oil cooler of the oil according to the inlet temperature T3 of the oil cooler of the oil and the temperature rise △Tb of the oil.

[0011] In some embodiments, the obtaining the oil flow rate Q2 includes:

[0012] Obtain the rotational speed of the electric oil pump and the pump volumetric efficiency;

[0013] Obtain the oil flow rate Q2 by calculating based on the rotational speed of the electric oil pump and the pump volumetric efficiency.

[0014] In some embodiments, the heat exchange performance table of the oil cooler is determined by the inlet cooling water temperature T1 of the oil cooler, the cooling water flow rate Q1, and the oil flow rate Q2.

[0015] In some embodiments, determining the inlet temperature T3 of the oil cooler for the oil according to the temperature difference △Ta between the oil and the cooling water and the inlet cooling water temperature T1 of the oil cooler includes:

[0016] T3 = T1 + △Ta.

[0017] In some embodiments, calculating the temperature rise △Tb of the oil according to the heat exchange amount W in the oil cooler, the oil flow rate Q2, and the heat capacity C2 of the oil includes:

[0018] △Tb = W / (Q2 * C2).

[0019] In some embodiments, determining the outlet temperature T4 of the oil cooler for the oil according to the inlet temperature T3 of the oil cooler for the oil and the temperature rise △Tb of the oil includes:

[0020] T4 = T3 + △Tb.

[0021] According to a second aspect of the present application, there is provided an internal oil temperature estimation device for a vehicle drive device, which includes:

[0022] A first unit for obtaining the inlet cooling water temperature T1 of the oil cooler, the outlet cooling water temperature T2 of the oil cooler, the cooling water flow rate Q1, and obtaining the oil flow rate Q2;

[0023] A second unit for calculating the heat exchange amount W in the oil cooler according to the inlet cooling water temperature T1 of the oil cooler, the outlet cooling water temperature T2 of the oil cooler, and the cooling water flow rate Q1;

[0024] A third unit for substituting the heat exchange amount W in the oil cooler and the oil flow rate Q2 into the heat exchange performance table of the oil cooler to obtain the temperature difference △Ta between the oil and the cooling water;

[0025] A fourth unit for determining the inlet temperature T3 of the oil cooler for the oil according to the temperature difference △ Ta between the oil and the cooling water and the inlet cooling water temperature T1 of the oil cooler;

[0026] A fifth unit for calculating the temperature rise △Tb of the oil according to the heat exchange amount W in the oil cooler, the oil flow rate Q2, and the specific heat capacity C2 of the oil;

[0027] The sixth unit is used to determine the outlet temperature T4 of the oil cooler for the oil based on the inlet temperature T3 of the oil cooler for the oil and the temperature rise △ Tb of the oil.

[0028] According to the third aspect of the present application, a vehicle is provided, which includes the internal oil temperature estimation device of the vehicle drive device described above.

[0029] According to the fourth aspect of the present application, an electronic device is provided. The electronic device includes: a processor and a memory storing computer program instructions; when the processor executes the computer program instructions, the internal oil temperature estimation method of any one of the above vehicle drive devices is implemented.

[0030] According to the fifth aspect of the present application, a computer-readable storage medium is provided. Computer program instructions are stored on the computer-readable storage medium, and when the computer program instructions are executed by a processor, the internal oil temperature estimation method of any one of the above vehicle drive devices is implemented.

[0031] In summary, the internal oil temperature estimation method, device and storage medium provided by the present application at least have the following beneficial effects:

[0032] In the embodiments of the present application, the inlet cooling water temperature T1 of the oil cooler, the outlet cooling water temperature T2 of the oil cooler and the cooling water flow rate Q1 can be obtained, and the oil flow rate Q2 can be obtained; based on the inlet cooling water temperature T1 of the oil cooler, the outlet cooling water temperature T2 of the oil cooler and the cooling water flow rate Q1, the heat exchange amount W in the oil cooler is calculated; according to the heat exchange amount W in the oil cooler and the oil flow rate Q2, substituting into the oil cooler heat exchange performance table, the temperature difference △Ta between the oil and the cooling water is obtained, so that based on the temperature difference △Ta between the oil and the cooling water and the inlet cooling water temperature T1 of the oil cooler, the inlet temperature T3 of the oil cooler for the oil is determined; and according to the heat exchange amount W in the oil cooler, the oil flow rate Q2 and the heat capacity of the oil, the temperature rise △Tb of the oil is calculated, and further based on the inlet temperature T3 of the oil cooler for the oil and the temperature rise △Tb of the oil, the outlet temperature T4 of the oil cooler for the oil is determined. The present application realizes accurate estimation of the oil temperature in the case where a temperature sensor for measuring the oil temperature cannot be installed in the drive device due to various reasons, so as to monitor the oil temperature, thereby avoiding the performance degradation of the vehicle drive device, the aging of electrical components and the potential safety hazards to driving safety caused by abnormal oil temperature. Description of the Drawings

[0033] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings or solutions can be obtained based on these drawings.

[0034] Figure 1 Flow chart of a method for estimating the internal oil temperature of a vehicle drive device provided by an embodiment of the present application;

[0035] Figure 2 Schematic diagram of a vehicle system provided by an embodiment of the present application;

[0036] Figure 3 Schematic structural diagram of an internal oil temperature estimation device for a vehicle drive device provided by an embodiment of the present application;

[0037] Figure 4 Structural diagram of an electronic device provided by an embodiment of the present application. Detailed implementation manners

[0038] In order to make the above and other features and advantages of the present application clearer, the present application will be further described below with reference to the accompanying drawings. It should be understood that the specific embodiments given herein are for the purpose of explaining to those skilled in the art and are merely exemplary, not restrictive.

[0039] In the following description, many specific details are set forth to provide a thorough understanding of the present application. However, it is obvious to those skilled in the art that the present application does not need to adopt the specific details. In other cases, well-known steps or operations are not described in detail to avoid obscuring the present application.

[0040] The method provided by the embodiment of the present application can be executed by the internal oil temperature estimation device for a vehicle drive device provided by the embodiment of the present application, and this device can be configured in an electronic device.

[0041] In an embodiment of the present application, the preconditions for executing the method for estimating the internal oil temperature of the vehicle drive device include: there is oil for lubrication or cooling in the vehicle drive device; there is an oil cooler for heat exchange between the oil and the cooling water, and the oil flows into the oil cooler through a motor-driven pump.

[0042] Refer to Figure 1 and Figure 2 , the method for estimating the internal oil temperature of the vehicle drive device described in the embodiment of the present application is used to estimate Figure 2 the inlet temperature T3 of the oil cooler of the oil shown in and the outlet temperature T4 of the oil cooler of the oil, and includes the following steps:

[0043] S11. Obtain the inlet cooling water temperature T1 of the oil cooler, the outlet cooling water temperature T2 of the oil cooler, and the cooling water flow rate Q1, and obtain the oil flow rate Q2.

[0044] Among them, the inlet cooling water temperature T1 of the oil cooler, the outlet cooling water temperature T2 of the oil cooler, and the cooling water flow rate Q1 can be obtained from the vehicle side. For example, the inlet cooling water temperature T1 and the outlet cooling water temperature T2 of the oil cooler can be measured by a temperature sensor. The embodiments of the present application do not specifically limit the method for obtaining the inlet cooling water temperature T1 of the oil cooler, the outlet cooling water temperature T2 of the oil cooler, and the cooling water flow rate Q1, and any method of the prior art can be used to obtain them.

[0045] In one implementation, the oil flow rate Q2 can be calculated by the MCU in the EDU (Electronic Drive Unit). One embodiment of obtaining the oil flow rate Q2 includes:

[0046] Obtain the rotational speed n of the electric oil pump and the pump volumetric efficiency ηv;

[0047] Calculate and obtain the oil flow rate Q2 according to the rotational speed n of the electric oil pump and the pump volumetric efficiency ηv. Specifically, the oil flow rate Q2 can be calculated using the following formula:

[0048] Q2 = A * n * ηv, where A represents the theoretical displacement of the pump.

[0049] It can be understood that the method for obtaining the oil flow rate is not limited to this, and any method of the prior art can also be used to obtain it. The present application does not make specific limitations on this.

[0050] In one implementation, obtaining the inlet cooling water temperature T1 of the oil cooler, the outlet cooling water temperature T2 of the oil cooler, and the cooling water flow rate Q1, and obtaining the oil flow rate Q2 are obtained from the vehicle and directly stored in the MCU in the EDU.

[0051] S12. Calculate the heat exchange amount W in the oil cooler according to the inlet cooling water temperature T1 of the oil cooler, the outlet cooling water temperature T2 of the oil cooler, and the cooling water flow rate Q1.

[0052] In one implementation, according to the inlet cooling water temperature T1 of the oil cooler, the outlet cooling water temperature T2 of the oil cooler, and the cooling water flow rate Q1, the heat exchange amount W in the oil cooler can be calculated using the following formula:

[0053] W = Q1 * C1 * (T2 - T1)

[0054] Where C1 is the specific heat capacity of the cooling water.

[0055] It can be understood that the above method for calculating the heat exchange amount W in the oil cooler according to the inlet cooling water temperature T1 of the oil cooler, the outlet cooling water temperature T2 of the oil cooler, and the cooling water flow rate Q1 is only an example, and the present application is not limited to this.

[0056] S13. Substitute the heat exchange amount W and the oil flow rate Q2 in the oil cooler into the heat exchange performance table of the oil cooler to obtain the temperature difference between the oil and the cooling water △ Ta.

[0057] In one embodiment, the temperature difference △Ta between the oil and the cooling water measured under multiple groups of different experimental data of the inlet cooling water temperature T1, the outlet cooling water temperature T2, the cooling water flow rate Q1 and the oil flow rate Q2 of the oil cooler can be determined based on experiments. Among them, the heat exchange amount can be calculated according to the inlet cooling water temperature T1, the outlet cooling water temperature T2 and the cooling water flow rate Q1. Therefore, the temperature difference △Ta corresponding to different heat exchange amounts and the oil flow rate Q2 can be obtained, and the heat exchange performance table of the oil cooler can be determined accordingly. An embodiment of the heat exchange performance table of the oil cooler is shown in the following table.

[0058] [W]

[0059]

[0060] In one embodiment, the heat exchange performance table of the oil cooler determined by the inlet cooling water temperature T1, the cooling water flow rate Q1 and the oil flow rate Q2 of the oil cooler can be stored in the MCU of the vehicle EDU. Substitute the heat exchange amount W and the oil flow rate Q2 in the oil cooler into the heat exchange performance table of the oil cooler, and the temperature difference △Ta between the oil and the cooling water can be obtained.

[0061] S14. Determine the inlet temperature T3 of the oil cooler of the oil according to the temperature difference △Ta between the oil and the cooling water and the inlet cooling water temperature T1 of the oil cooler.

[0062] In one embodiment, the step of determining the inlet temperature T3 of the oil cooler of the oil according to the temperature difference △Ta between the oil and the cooling water and the inlet cooling water temperature T1 of the oil cooler includes calculating the inlet temperature T3 of the oil cooler of the oil using the following formula:

[0063] T3 = T1 + △Ta.

[0064] S15. Calculate the temperature rise △Tb of the oil according to the heat exchange amount W, the oil flow rate Q2 and the heat capacity of the oil in the oil cooler.

[0065] In one embodiment, the step of calculating the temperature rise △Tb of the oil according to the heat exchange amount W, the oil flow rate Q2 and the specific heat capacity C2 of the oil in the oil cooler includes:

[0066] △Tb = W / (Q2 * C2).

[0067] It can be understood that the above method for calculating the temperature rise of the oil is only an example, and the present application is not limited thereto.

[0068] S16. Determine the outlet temperature T4 of the oil cooler for the oil based on the inlet temperature T3 of the oil cooler for the oil and the temperature rise ΔTb of the oil.

[0069] In one implementation, the step of determining the outlet temperature T4 of the oil cooler for the oil based on the inlet temperature T3 of the oil cooler for the oil and the temperature rise ΔTb of the oil includes calculating the outlet temperature T4 of the oil cooler for the oil using the following formula:

[0070] T4 = T3 + ΔTb.

[0071] In the embodiments of the present application, the inlet cooling water temperature T1 of the oil cooler, the outlet cooling water temperature T2 of the oil cooler, and the cooling water flow rate Q1 can be obtained, and the oil flow rate Q2 can be obtained; based on the inlet cooling water temperature T1 of the oil cooler, the outlet cooling water temperature T2 of the oil cooler, and the cooling water flow rate Q1, the heat exchange amount W in the oil cooler is calculated; according to the heat exchange amount W in the oil cooler and the oil flow rate Q2, substituting into the heat exchange performance table of the oil cooler to obtain the temperature difference ΔTa between the oil and the cooling water, thereby determining the inlet temperature T3 of the oil cooler for the oil based on the temperature difference ΔTa between the oil and the cooling water and the inlet cooling water temperature T1 of the oil cooler; and calculating the temperature rise ΔTb of the oil according to the heat exchange amount W in the oil cooler, the oil flow rate Q2, and the heat capacity of the oil, and further determining the outlet temperature T4 of the oil cooler for the oil based on the inlet temperature T3 of the oil cooler for the oil and the temperature rise ΔTb of the oil. The present application realizes accurate estimation of the oil temperature in the case where a temperature sensor for measuring the oil temperature cannot be installed in the drive device due to various reasons, so as to monitor the oil temperature, thereby avoiding potential problems such as performance degradation of the vehicle drive device, aging of electrical components, and hidden dangers to driving safety caused by abnormal oil temperature.

[0072] According to the present application, an internal oil temperature estimation device for a vehicle drive device is provided, as Figure 3 shown, the internal oil temperature estimation device for the vehicle drive device includes:

[0073] A first unit 310, configured to obtain the inlet cooling water temperature T1 of the oil cooler, the outlet cooling water temperature T2 of the oil cooler, and the cooling water flow rate Q1, and obtain the oil flow rate Q2.

[0074] Among them, the inlet cooling water temperature T1 of the oil cooler, the outlet cooling water temperature T2 of the oil cooler, and the cooling water flow rate Q1 can be obtained from the vehicle side. For example, the inlet cooling water temperature T1 of the oil cooler and the outlet cooling water temperature T2 of the oil cooler can be measured by a temperature sensor. The embodiments of the present application do not specifically limit the method for the first unit 310 to obtain the inlet cooling water temperature T1 of the oil cooler, the outlet cooling water temperature T2 of the oil cooler, and the cooling water flow rate Q1, and any method in the prior art can be used to obtain them.

[0075] In one embodiment, the example in which the first unit 310 obtains the oil flow rate Q2 includes:

[0076] Obtain the rotational speed n of the electric oil pump and the pump volumetric efficiency ηv;

[0077] Calculate and obtain the oil flow rate Q2 according to the rotational speed n of the electric oil pump and the pump volumetric efficiency ηv. Specifically, the oil flow rate Q2 can be calculated using the following formula:

[0078] Q2 = A * n * ηv, where A represents the theoretical displacement of the pump.

[0079] In one embodiment, the first unit 310 can obtain the inlet cooling water temperature T1 of the oil cooler, the outlet cooling water temperature T2 of the oil cooler, and the cooling water flow rate Q1 from the vehicle, and obtain the oil flow rate Q2 and directly store it in the MCU in the EDU.

[0080] A second unit 320, configured to calculate the heat exchange amount W in the oil cooler according to the inlet cooling water temperature T1 of the oil cooler, the outlet cooling water temperature T2 of the oil cooler, and the cooling water flow rate Q1.

[0081] In one embodiment, the second unit 320 can calculate the heat exchange amount W in the oil cooler according to the inlet cooling water temperature T1 of the oil cooler, the outlet cooling water temperature T2 of the oil cooler, and the cooling water flow rate Q1 using the following formula:

[0082] W = Q1 * C1 * (T2 - T1)

[0083] where C1 is the specific heat capacity of the cooling water.

[0084] It can be understood that the method for the second unit 320 to calculate the heat exchange amount W in the oil cooler according to the inlet cooling water temperature T1 of the oil cooler, the outlet cooling water temperature T2 of the oil cooler, and the cooling water flow rate Q1 is only an example, and this application is not limited thereto.

[0085] A third unit 330, configured to substitute the heat exchange amount W in the oil cooler and the oil flow rate Q2 into the oil cooler heat exchange performance table to obtain the temperature difference ΔTa between the oil and the cooling water.

[0086] In one embodiment, the temperature difference ΔTa between the oil and the cooling water can be measured based on multiple sets of different experimental data of the inlet cooling water temperature T1, the outlet cooling water temperature T2, the cooling water flow rate Q1, and the oil flow rate Q2 of the oil cooler determined through experiments. Among them, the heat exchange amount can be calculated based on the inlet cooling water temperature T1, the outlet cooling water temperature T2, and the cooling water flow rate Q1. Therefore, the temperature difference ΔTa corresponding to different heat exchange amounts and the oil flow rate Q2 can be obtained, and based on this, the heat exchange performance table of the oil cooler can be determined. An embodiment of the heat exchange performance table of the oil cooler is shown in the following table.

[0087] [w]

[0088]

[0089] In one embodiment, the heat exchange performance table of the oil cooler is stored in the MCU within the vehicle EDU. The third unit 330 substitutes the heat exchange amount W and the oil flow rate Q2 in the oil cooler into the heat exchange performance table of the oil cooler to obtain the temperature difference ΔTa between the oil and the cooling water.

[0090] The fourth unit 340 is configured to determine the inlet temperature T3 of the oil cooler for the oil based on the temperature difference ΔTa between the oil and the cooling water and the inlet cooling water temperature T1 of the oil cooler;

[0091] In one embodiment, the fourth unit 340 determines the inlet temperature T3 of the oil cooler for the oil based on the temperature difference ΔTa between the oil and the cooling water and the inlet cooling water temperature T1 of the oil cooler, including calculating the inlet temperature T3 of the oil cooler for the oil using the following formula:

[0092] T3 = T1 + ΔTa.

[0093] The fifth unit 350 is configured to calculate the temperature rise ΔTb of the oil based on the heat exchange amount W, the oil flow rate Q2, and the specific heat capacity C2 of the oil in the oil cooler;

[0094] In one embodiment, the fifth unit 350 calculates the temperature rise ΔTb of the oil based on the heat exchange amount W, the oil flow rate Q2, and the specific heat capacity C2 of the oil in the oil cooler, including:

[0095] ΔTb = W / (Q2 * C2).

[0096] The sixth unit 360 is configured to determine the outlet temperature T4 of the oil cooler for the oil based on the inlet temperature T3 of the oil cooler for the oil and the temperature rise ΔTb of the oil;

[0097] In one embodiment, the sixth unit 360 determines the outlet temperature T4 of the oil cooler for the oil based on the inlet temperature T3 of the oil cooler for the oil and the temperature rise ΔTb of the oil, including calculating the outlet temperature T4 of the oil cooler for the oil using the following formula:

[0098] T4 = T3 + △Tb.

[0099] In summary, in the case where a temperature sensor for measuring the oil temperature cannot be installed in the drive device for various reasons, the internal oil temperature estimation device of the vehicle drive device described in the embodiments of the present application can calculate the heat exchange amount in the oil cooler by obtaining the inlet cooling water temperature of the oil cooler, the outlet cooling water temperature of the oil cooler, the cooling water flow rate, and the oil flow rate, and then substitute it into the oil cooler heat exchange performance table to obtain the temperature difference between the oil and the cooling water, thereby determining the inlet temperature of the oil cooler of the oil; and according to the heat exchange amount in the oil cooler, the oil flow rate, and the heat capacity of the oil, calculate the temperature rise of the oil, and further determine the outlet temperature of the oil cooler of the oil; realize accurate estimation of the oil temperature, so that the oil temperature can be monitored, and avoid the performance degradation of the vehicle drive device, the aging of electrical components, and the potential hazards to driving safety caused by abnormal oil temperature.

[0100] It should be understood that the specific features, operations, and details described above regarding the method of the present application can be similarly applied to the devices and systems of the present application, or vice versa. In addition, each step of the method of the present application described above can be executed by the corresponding components or units of the device or system of the present application.

[0101] It should be understood that each module / unit of the device of the present application can be implemented in whole or in part by software, hardware, firmware, or a combination thereof. Each module / unit can be embedded in the processor of the electronic device in the form of hardware or firmware or independent of the processor, or can be stored in the memory of the electronic device in the form of software for the processor to call to execute the operations of each module / unit. Each module / unit can be implemented as an independent component or module, or two or more modules / units can be implemented as a single component or module.

[0102] The present application also provides a vehicle, including the internal oil temperature estimation device of the vehicle drive device described in any of the above embodiments.

[0103] As Figure 4 shown, the present application provides an electronic device 400, which includes a processor 401 and a memory 402 storing computer program instructions. Among them, when the processor 401 executes the computer program instructions, each step of the above-mentioned internal oil temperature estimation method of the vehicle drive device is implemented. The electronic device 400 can be generally a server, a terminal, or any other electronic device with necessary computing and / or processing capabilities.

[0104] In one embodiment, the electronic device 400 may include a processor, a memory, a network interface, a communication interface, etc. connected via a system bus. The processor of the electronic device 400 may be used to provide necessary computing, processing, and / or control capabilities. The memory of the electronic device 400 may include a non-volatile storage medium and an internal memory. The non-volatile storage medium may store an operating system, computer programs, etc. The internal memory may provide an environment for the operation of the operating system and computer programs in the non-volatile storage medium. The network interface and communication interface of the electronic device 400 may be used to connect and communicate with external devices via a network. When the computer program is executed by the processor, it executes the steps of the method of this application.

[0105] In addition, this application provides a computer-readable storage medium, on which computer program instructions are stored. When the computer program instructions are executed by a processor, the above-mentioned method for estimating the internal oil temperature of the vehicle drive device is implemented.

[0106] Those skilled in the art can understand that the method steps of this application can be completed by a computer program instructing relevant hardware such as the electronic device 400 or the processor. The computer program can be stored in a non-transitory computer-readable storage medium. When the computer program is executed, the steps of this application are caused to be executed. Depending on the situation, any reference to a memory, storage, or other medium in this document may include non-volatile or volatile memory. Examples of non-volatile memory include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), flash memory, magnetic tape, floppy disk, magneto-optical data storage device, optical data storage device, hard disk, solid state disk, etc. Examples of volatile memory include random access memory (RAM), external cache memory, etc.

[0107] The above-described technical features can be combined arbitrarily. Although all possible combinations of these technical features are not described, any combination of these technical features should be considered to be covered by this specification as long as such a combination does not conflict.

[0108] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them; although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A method for estimating the internal oil temperature of a vehicle drive device, characterized in that The method includes: Obtaining the inlet cooling water temperature T1 of the oil cooler, the outlet cooling water temperature T2 of the oil cooler, and the cooling water flow rate Q1, and obtaining the oil flow rate Q2; Calculating the heat exchange amount W in the oil cooler according to the inlet cooling water temperature T1 of the oil cooler, the outlet cooling water temperature T2 of the oil cooler, and the cooling water flow rate Q1; Substituting the heat exchange amount W in the oil cooler and the oil flow rate Q2 into the oil cooler heat exchange performance table to obtain the temperature difference ΔTa between the oil and the cooling water; Based on the temperature difference between the oil and the cooling water △ Ta and the inlet cooling water temperature T1 of the oil cooler, determine the inlet temperature T3 of the oil for the oil cooler; Calculating the temperature rise ΔTb of the oil according to the heat exchange amount W in the oil cooler, the oil flow rate Q2, and the specific heat capacity C2 of the oil; Determining the outlet temperature T4 of the oil cooler of the oil according to the inlet temperature T3 of the oil cooler of the oil and the temperature rise ΔTb of the oil.

2. The method according to claim 1, characterized in that, Obtaining the oil flow rate Q2 includes: Obtaining the rotation speed of the electric oil pump and the pump volumetric efficiency; Calculating and obtaining the oil flow rate Q2 according to the rotation speed of the electric oil pump and the pump volumetric efficiency.

3. The method according to claim 1, wherein The oil cooler heat exchange performance table is determined by the inlet cooling water temperature T1 of the oil cooler, the cooling water flow rate Q1, and the oil flow rate Q2.

4. The method according to claim 1, characterized in that, The determining the inlet temperature T3 of the oil cooler of the oil according to the temperature difference ΔTa between the oil and the cooling water and the inlet cooling water temperature T1 of the oil cooler includes: T3 = T1 + ΔTa.

5. The method according to claim 1, characterized in that, The calculating the temperature rise ΔTb of the oil according to the heat exchange amount W in the oil cooler, the oil flow rate Q2, and the specific heat capacity C2 of the oil includes: △ Tb = W / (Q2 * C2).

6. The method according to any one of claims 1 to 5, characterized in that The determining the outlet temperature T4 of the oil cooler of the oil according to the inlet temperature T3 of the oil cooler of the oil and the temperature rise ΔTb of the oil includes: T4 = T3 + ΔTb.

7. An internal oil temperature estimation device for a vehicle drive device, characterized in that, Includes: A first unit for obtaining the inlet cooling water temperature T1 of the oil cooler, the outlet cooling water temperature T2 of the oil cooler, and the cooling water flow rate Q1, and obtaining the oil flow rate Q2; A second unit for calculating the heat exchange amount W in the oil cooler according to the inlet cooling water temperature T1 of the oil cooler, the outlet cooling water temperature T2 of the oil cooler, and the cooling water flow rate Q1; A third unit for substituting the heat exchange amount W in the oil cooler and the oil flow rate Q2 into the oil cooler heat exchange performance table to obtain the temperature difference ΔTa between the oil and the cooling water; The fourth unit is used to determine the inlet temperature T3 of the oil cooler of the oil according to the temperature difference between the oil and the cooling water △ Ta and the inlet cooling water temperature T1 of the oil cooler, A fifth unit for calculating the temperature rise ΔTb of the oil according to the heat exchange amount W in the oil cooler, the oil flow rate Q2, and the specific heat capacity C2 of the oil; The sixth unit is used to determine the oil cooler outlet temperature T4 of the oil according to the oil cooler inlet temperature T3 of the oil and the temperature rise △ Tb of the oil.

8. A vehicle, characterized in that, Includes the internal oil temperature estimation device of the vehicle drive device according to claim 7.

9. An electronic device, comprising a memory and a processor, wherein computer instructions are stored on the memory, characterized in that The computer instructions, when executed by the processor, execute the method for estimating the internal oil temperature of the vehicle drive device according to any one of claims 1-6.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, The computer program, when executed by the processor, executes the method for estimating the internal oil temperature of the vehicle drive device according to any one of claims 1-6.

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