CN115577457A

CN115577457A - Oil temperature determination method and device for transmission system in vehicle and electronic device

Info

Publication number: CN115577457A
Application number: CN202211392835.7A
Authority: CN
Inventors: 徐占; 张冰; 王学旭; 白学斌; 石珊; 贾旭东; 金子嵛; 于博瑞
Original assignee: FAW Group Corp
Current assignee: FAW Group Corp
Priority date: 2022-11-08
Filing date: 2022-11-08
Publication date: 2023-01-06

Abstract

The invention discloses a method and a device for determining oil temperature of a transmission system in a vehicle and an electronic device, and relates to the technical field of vehicles. Wherein, the method comprises the following steps: acquiring working parameters of an oil-water heat exchanger of a transmission system, wherein the working parameters at least comprise: the heat dissipation power, the inlet water flow, the inlet oil flow and the inlet water temperature are determined according to the input working condition of the vehicle; determining the logarithmic temperature difference of the oil-water heat exchanger according to the heat dissipation power; determining the water temperature difference of the oil-water heat exchanger according to the heat dissipation power and the inlet water flow; determining the oil temperature difference of the oil-water heat exchanger according to the heat dissipation power and the inlet oil flow; and determining the oil temperature of the transmission system according to the logarithmic temperature difference, the water temperature difference, the oil temperature difference and the inlet water temperature. The invention solves the technical problems of complex method, longer calculation period and lower efficiency caused by solving the problem of thermal failure of the transmission system through simulation calculation in the related technology.

Description

Oil temperature determination method and device for transmission system in vehicle and electronic device

Technical Field

The invention relates to the technical field of vehicles, in particular to a method and a device for determining oil temperature of a transmission system in a vehicle, a storage medium and an electronic device.

Background

In the running process of a vehicle transmission system, the oil temperature of an oil-water heat exchanger in the transmission system is increased to a certain extent due to the conditions of friction heat generation and the like. However, the viscosity of the oil is reduced due to the excessively high oil temperature, so that the performances of abrasion resistance, oxidation resistance and corrosion resistance of a transmission system are reduced, and the problem of thermal failure of devices such as clutches, synchronizers and bearings is caused indirectly.

At present, the problem of thermal failure of a transmission system caused by overhigh oil temperature is mainly solved through a simulation technology, and thermal performance of the transmission system and thermal performance of each part in the transmission system are calculated through simulation software, so that thermal failure prediction is carried out on the transmission system at the initial development stage of the transmission system. However, the simulation calculation usually requires the steps of model preprocessing, grid drawing, simulation calculation, result postprocessing and the like, and the calculation method is complex, the calculation period is long, and the efficiency is low.

In view of the above problems, no effective solution has been proposed.

Disclosure of Invention

The embodiment of the invention provides a method and a device for determining the oil temperature of a transmission system in a vehicle, a storage medium and an electronic device, which are used for at least solving the technical problems of complex method, longer calculation period and lower efficiency caused by solving the thermal failure problem of the transmission system through simulation calculation in the related technology.

According to an embodiment of the present invention, there is provided a method of determining an oil temperature of a transmission system in a vehicle, including:

obtaining working parameters of an oil-water heat exchanger of a transmission system, wherein the working parameters at least comprise: the heat dissipation power, the inlet water flow, the inlet oil flow and the inlet water temperature are determined according to the input working condition of the vehicle; determining the logarithmic temperature difference of the oil-water heat exchanger according to the heat dissipation power, wherein the logarithmic temperature difference is used for representing the temperature change of the oil-water heat exchanger; determining the water temperature difference of the oil-water heat exchanger according to the heat dissipation power and the inlet water flow, wherein the water temperature difference is used for representing the difference value between the inlet water temperature and the outlet water temperature of the oil-water heat exchanger; determining the oil temperature difference of the oil-water heat exchanger according to the heat dissipation power and the inlet oil flow, wherein the oil temperature difference is used for representing the difference value between the inlet oil temperature and the outlet oil temperature of the oil-water heat exchanger; and determining the oil temperature of the transmission system according to the logarithmic temperature difference, the water temperature difference, the oil temperature difference and the inlet water temperature.

Optionally, obtaining the heat dissipation power of the oil-water heat exchanger of the transmission system includes: determining a heat convection state of the transmission system and air, wherein the heat convection state is used for indicating whether the transmission system carries out heat convection with the air or not; in response to the fact that the transmission system does not exchange heat with air in a convection mode, determining the heat generating power of the transmission system to be heat dissipation power; and responding to the heat convection between the transmission system and the air, and determining the heat dissipation power according to the input working condition.

Optionally, determining the heat dissipation power according to the input operating condition includes: and determining the heat dissipation power according to the type of the vehicle, the type of the transmission system and the vehicle speed of the vehicle in the input working condition.

Optionally, determining the logarithmic temperature difference of the oil-water heat exchanger according to the heat dissipation power comprises: and determining the logarithmic temperature difference according to the thermal resistance and the heat dissipation power of the oil-water heat exchanger.

Optionally, the determining the water temperature difference of the oil-water heat exchanger according to the heat dissipation power and the inlet water flow includes: and determining the water temperature difference according to the specific heat capacity of the water, the density of the water, the heat dissipation power and the inlet water flow.

Optionally, determining the oil temperature difference of the oil-water heat exchanger according to the heat dissipation power and the inlet oil flow includes: and determining the oil temperature difference according to the specific heat capacity of the oil, the density of the oil, the heat dissipation power and the inlet oil flow.

There is also provided, according to an embodiment of the present invention, an oil temperature determining apparatus of a transmission system in a vehicle, including:

the acquisition module is used for acquiring the working parameters of the oil-water heat exchanger of the transmission system, wherein the working parameters at least comprise: the heat dissipation power, the inlet water flow, the inlet oil flow and the inlet water temperature are determined according to the input working condition of the vehicle; the first determining module is used for determining the logarithmic temperature difference of the oil-water heat exchanger according to the heat dissipation power, wherein the logarithmic temperature difference is used for representing the temperature change of the oil-water heat exchanger; the second determination module is used for determining the water temperature difference of the oil-water heat exchanger according to the heat dissipation power and the inlet water flow, wherein the water temperature difference is used for representing the difference value between the inlet water temperature and the outlet water temperature of the oil-water heat exchanger; the third determining module is used for determining the oil temperature difference of the oil-water heat exchanger according to the heat dissipation power and the inlet oil flow, wherein the oil temperature difference is used for representing the difference value between the inlet oil temperature and the outlet oil temperature of the oil-water heat exchanger; and the fourth determining module is used for determining the oil temperature of the transmission system according to the logarithmic temperature difference, the water temperature difference, the oil temperature difference and the inlet water temperature.

Optionally, the obtaining module is further configured to determine a heat convection state of the transmission system and air, where the heat convection state is used to indicate whether the transmission system is in heat convection with the air; determining the heat generating power of the transmission system as the heat dissipation power in response to the fact that the transmission system does not exchange heat with air in a convection mode; and responding to the heat convection between the transmission system and the air, and determining the heat dissipation power according to the input working condition.

Optionally, the obtaining module is further configured to determine the heat dissipation power according to the type of the vehicle, the type of the transmission system, and a vehicle speed of the vehicle in the input operating condition.

Optionally, the first determining module is further configured to determine a logarithmic temperature difference according to the thermal resistance and the heat dissipation power of the oil-water heat exchanger.

Optionally, the second determination module is further configured to determine the water temperature difference according to the specific heat capacity of water, the density of water, the heat dissipation power, and the inlet water flow rate.

Optionally, the third determining module is further configured to determine the oil temperature difference according to a specific heat capacity of the oil, a density of the oil, a heat dissipation power, and an inlet oil flow rate.

There is also provided, in accordance with an embodiment of the present invention, a processor for running a program, wherein the program is arranged to execute the method of determining an oil temperature of a transmission system in a vehicle as in any one of the above.

According to an embodiment of the present invention, there is further provided a computer-readable storage medium having a computer program stored therein, wherein the computer program is configured to, when run on a computer or a processor, perform the method for determining an oil temperature of a transmission system in a vehicle as in any one of the above.

According to an embodiment of the present invention, there is also provided an electronic device, including a memory and a processor, the memory storing therein a computer program, the processor being configured to execute the computer program to perform the method for determining the oil temperature of a transmission system in a vehicle in any one of the above.

In the embodiment of the invention, by adopting the steps, the heat dissipation power of the oil-water heat exchanger of the vehicle transmission system is obtained, the inlet water flow, the inlet oil flow and the inlet water temperature of the oil-water heat exchanger of the transmission system are determined according to the input working condition of the vehicle, the logarithmic temperature difference for representing the temperature change of the oil-water heat exchanger is determined according to the heat dissipation power and the inlet water flow, the water temperature difference for representing the difference value between the inlet water temperature and the outlet water temperature in the oil-water heat exchanger is determined according to the heat dissipation power and the inlet oil flow, the oil temperature difference for representing the difference value between the inlet oil temperature and the outlet oil temperature in the oil-water heat exchanger is determined according to the heat dissipation power and the inlet oil flow, and finally the oil temperature of the transmission system is determined according to the determined logarithmic temperature difference, the water temperature difference, the oil temperature difference and the inlet water temperature. The purpose that the optimal input oil temperature of the transmission system can be accurately determined by simple calculation based on fewer working parameters in the initial stage of system development is achieved, and therefore the problem of thermal failure of the transmission system can be effectively avoided. In addition, according to the determined oil temperature of the transmission system, the type selection of parts such as an oil-water heat exchanger and an oil pump in the system can be powerfully supported at the initial stage of product development, and the design of the requirements on the external cooling water temperature and the water flow of the transmission system is realized, so that the type selection redundancy of all parts of the cooling system can be avoided, the system efficiency is improved while the system thermal failure problem is considered, and further the technical problems that the thermal failure problem of the transmission system is solved through simulation calculation in the related technology, the method is complex, the calculation period is long, and the efficiency is low are solved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention and do not constitute a limitation of the invention. In the drawings:

FIG. 1 is a flow chart of transmission system oil temperature determination in a vehicle according to one embodiment of the present invention;

fig. 2 is a block diagram of a configuration of an oil temperature determining apparatus of a transmission system in a vehicle according to an embodiment of the present invention.

Detailed Description

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in other sequences than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

In accordance with one embodiment of the present invention, there is provided an embodiment of a method for determining an oil temperature of a transmission system, it should be noted that the steps illustrated in the flowchart of the accompanying drawings may be executed in a computer system, such as a set of computer executable instructions, and that while a logical order is illustrated in the flowchart, in some cases the steps illustrated or described may be executed in an order different than that illustrated herein.

The method embodiments may be performed in an electronic device, similar control device or system comprising a memory and a processor. Taking an electronic device as an example, the electronic device may include one or more processors and memory for storing data. Optionally, the electronic apparatus may further include a communication device for a communication function and a display device. It will be understood by those skilled in the art that the foregoing structural description is merely illustrative and not restrictive on the structure of the electronic device. For example, the electronic device may also include more or fewer components than described above, or have a different configuration than described above.

A processor may include one or more processing units. For example: the processor may include a Central Processing Unit (CPU), a Graphic Processing Unit (GPU), a Digital Signal Processing (DSP) chip, a Microprocessor (MCU), a field-programmable gate array (FPGA), a neural Network Processor (NPU), a Tensor Processing Unit (TPU), an Artificial Intelligence (AI) type processor, and the like. Wherein the different processing units may be separate components or may be integrated in one or more processors. In some examples, the electronic device may also include one or more processors.

The memory may be configured to store a computer program, for example, a computer program corresponding to the oil temperature determination method of the transmission system according to the embodiment of the present invention, and the processor may implement the oil temperature determination method of the transmission system by running the computer program stored in the memory. The memory may include high speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory may further include memory remotely located from the processor, which may be connected to the electronic device over a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.

Communication devices are used to receive or transmit data via a network. Specific examples of the network described above may include a wireless network provided by a communication provider of the mobile terminal. In one example, the communication device includes a network adapter (NIC) that can be connected to other network devices through a base station to communicate with the internet. In one example, the communication device may be a Radio Frequency (RF) module for communicating with the internet by wireless.

The display device may be, for example, a touch screen type Liquid Crystal Display (LCD) and a touch display (also referred to as a "touch screen" or "touch display screen"). The liquid crystal display may enable a user to interact with a user interface of the mobile terminal. In some embodiments, the mobile terminal has a Graphical User Interface (GUI), and the user can perform human-computer interaction with the GUI by touching a finger contact and/or a gesture on the touch-sensitive surface, where the human-computer interaction function optionally includes the following interactions: executable instructions for creating web pages, drawing, word processing, making electronic documents, games, video conferencing, instant messaging, emailing, call interfacing, playing digital video, playing digital music, and/or web browsing, etc., for performing the above-described human-computer interaction functions, are configured/stored in one or more processor-executable computer program products or readable storage media.

In the present embodiment, a method for determining an oil temperature of a transmission system operating in an electronic device is provided, and fig. 1 is a flowchart of a method for determining an oil temperature of a transmission system according to an embodiment of the present invention, as shown in fig. 1, the flowchart includes the following steps:

s10, acquiring working parameters of an oil-water heat exchanger of the transmission system;

wherein, the working parameters at least include: the heat dissipation power, the inlet water flow, the inlet oil flow and the inlet water temperature are determined according to the input working condition of the vehicle.

The vehicle transmission system is generally composed of a clutch, a transmission, a universal transfer transmission device and a related drive axle, and is a power transmission device for interconnecting an engine and a four-wheel drive of an automobile, and the excellent transmission system can smoothly ensure safer and more stable operation and driving of the vehicle.

It can be understood that, because the transmission system of the vehicle is composed of a large amount of equipment, the equipment can generate heat during operation, therefore, a heat exchanger is usually used for heat exchange and heat dissipation, the commonly used heat exchanger comprises an oil-water heat exchanger, and the oil-water heat exchanger transfers heat through heat transfer between two media of oil and water, so that heat exchange and heat dissipation of the transmission system are realized.

Specifically, oil water heat exchanger adopts shell and tube structure more, arranges the cooling water route in, includes: the water inlet, the water outlet, the oil inlet and the oil outlet are used for cooling oil with higher temperature entering from the oil inlet by using water with lower temperature entering from the water inlet, the water with higher temperature after cooling is discharged from the water outlet, and the oil with lower temperature after cooling is discharged from the oil outlet, so that heat exchange between two liquid media of oil and water is realized, and the purpose of transferring heat to a transmission system through the oil-water heat exchanger is achieved, and the normal operation of a vehicle transmission system is ensured.

In the working parameters of the oil-water heat exchanger, the heat dissipation power of the oil-water heat exchanger represents the heat dissipated by the oil-water heat exchanger in unit time, and represents the heat dissipation capacity of the oil-water heat exchanger. It can be understood that the oil-water heat exchanger transfers heat generated by the vehicle transmission system, and the heat generated by the vehicle transmission system is not necessarily transferred through the oil-water heat exchanger, so that when the heat dissipation power of the oil-water heat exchanger of the transmission system is obtained, it is required to determine whether all the heat generated by the vehicle transmission system is transferred through the oil-water heat exchanger.

Specifically, when the heat dissipation power of the oil-water heat exchanger of the transmission system is obtained, if it is determined that the heat generated by the vehicle transmission system is transferred through the oil-water heat exchanger, it can be understood that the heat which needs to be transferred by the oil-water heat exchanger is all the heat generated by the vehicle transmission system, and the heat dissipation power of the oil-water heat exchanger is equal to the heat generation power of the vehicle transmission system; if it is determined that the heat generated by the vehicle transmission system is not completely transferred through the oil-water heat exchanger, but is transferred through a heat dissipation mode except the oil-water heat exchanger, air convection heat dissipation and the like, it can be understood that the heat which needs to be transferred by the oil-water heat exchanger is part of the heat generated by the vehicle transmission system, and the heat dissipation power of the oil-water heat exchanger is determined according to different input working conditions.

The inlet water flow, the inlet oil flow and the inlet water temperature in the working parameters of the oil-water heat exchanger of the transmission system are obtained, and the inlet water flow, the inlet oil flow and the inlet water temperature can be determined according to the input working condition. Because the oil-water heat exchangers of the transmission systems of different vehicles have different models and performances, and the working states of the oil-water heat exchangers of the same vehicle under different working conditions are also different, when the inlet water flow, the inlet oil flow and the inlet water temperature of the oil-water heat exchanger of the transmission system are obtained, the working states need to be determined according to the input working conditions of the vehicle.

It can be understood that, at the product development initial stage, the input condition of vehicle is for simulating through the different operating condition to the vehicle, the operating condition numerical value that obtains to regard this operating condition numerical value as the input condition, thereby can provide the input condition of more laminating actual conditions when confirming oil water heat exchanger's entry water flow, entry oil flow and entry temperature, and then guarantee the accuracy of the entry water flow, entry oil flow and the entry temperature of the oil water heat exchanger who determines.

Therefore, accurate data can be provided for subsequently determining the oil temperature of the transmission system only by acquiring the inlet water flow, the inlet oil flow and the inlet water temperature of the oil-water heat exchanger of the transmission system, and the accuracy of the determined oil temperature of the transmission system is further ensured.

S11, determining logarithmic temperature difference of the oil-water heat exchanger according to the heat dissipation power;

the logarithmic temperature difference is used for representing the temperature change of the oil-water heat exchanger.

The logarithmic temperature difference of the oil-water heat exchanger refers to the average value of integral of temperature difference generated by two fluids in the heat exchange process, the logarithmic temperature difference of the oil-water heat exchanger of the vehicle transmission system is determined based on the heat dissipation power of the oil-water heat exchanger, and it can be understood that the heat dissipation power of the oil-water heat exchanger represents the heat dissipated by the oil-water heat exchanger in unit time and represents the heat dissipation capacity of the oil-water heat exchanger, so that the logarithmic temperature difference of the oil-water heat exchanger determined according to the heat dissipation power can represent the temperature change of two liquid media of oil and water in the heat transfer process, namely the logarithmic temperature difference of the oil-water heat exchanger.

Optionally, the obtained heat dissipation power of the oil-water heat exchanger is recorded as P, and the logarithmic temperature difference a representing the temperature change of the oil-water heat exchanger can be obtained by calculating according to the heat dissipation power of the oil-water heat exchanger, so that the temperature change of the oil-water heat exchanger is determined.

Alternatively, the logarithmic temperature difference a of the oil-water heat exchanger can be calculated and determined by the following formula (1):

a＝A*P (1)

wherein, A in the formula (1) represents the thermal resistance of the oil-water heat exchanger.

It can be understood that, when the oil-water heat exchanger transfers heat generated by a transmission system of a vehicle, the oil-water heat exchanger transfers heat through two liquid media of oil and water, the temperature of the oil-water heat exchanger changes, the heat dissipation power of the oil-water heat exchanger is different along with different states of the transmission system, and the thermal resistance of the oil-water heat exchanger is different along with different types of the oil-water heat exchanger, so that when the heat dissipation power of the oil-water heat exchanger is determined according to the formula, the logarithmic temperature difference of the oil-water heat exchanger under the current working condition needs to be determined, a data base is provided for subsequently determining the oil temperature of the transmission system according to the determined oil temperature, and the accuracy of the determined oil temperature of the transmission system is ensured.

S12, determining the water temperature difference of the oil-water heat exchanger according to the heat dissipation power and the inlet water flow;

the water temperature difference is used for representing the difference value between the inlet water temperature and the outlet water temperature of the oil-water heat exchanger.

When the oil-water heat exchanger works, heat exchange is carried out through two liquid media of oil and water, and therefore heat transfer is achieved. It can be understood that the working principle of the oil-water heat exchanger is that the heat exchange is carried out on the oil with higher temperature entering through the oil inlet by the water with lower temperature entering through the water inlet, the oil temperature is cooled, the oil with higher temperature entering through the oil inlet is cooled, and after the heat exchange, the water with lower temperature entering through the water inlet and used for cooling the oil temperature can increase the temperature and is discharged from the water outlet. Therefore, the water temperature at the water inlet of the oil-water heat exchanger is lower than the water temperature at the water outlet, and a difference value exists between the inlet water temperature and the outlet water temperature of the oil-water heat exchanger, namely the water temperature difference of the oil-water heat exchanger.

Optionally, the obtained heat dissipation power of the oil-water heat exchanger is recorded as P, and a difference b between the inlet water temperature and the outlet water temperature of the oil-water heat exchanger can be obtained by calculating according to the heat dissipation power of the oil-water heat exchanger, so that the determination of the water temperature difference of the oil-water heat exchanger is realized.

Alternatively, the water temperature difference of the oil-water heat exchanger may be calculated and determined by the following formula (2):

b＝P/(C _{water (W)} ×ρ _{Water (I)} ×Q _{Water (I)} ) (2)

Wherein,c in formula (2) _{Water (I)} Represents the specific heat capacity, ρ, of the liquid of water in the oil-water heat exchanger _{Water (W)} Denotes the liquid density, Q, of water in the oil-water heat exchanger _{Water (W)} Indicating inlet water flow, Q, in the oil-water heat exchanger _{Water (I)} May be determined based on input conditions.

Therefore, the difference value between the inlet water temperature and the outlet water temperature of the oil-water heat exchanger can be calculated only according to the heat dissipation power and the inlet water flow, the water temperature difference of the oil-water heat exchanger is determined, the accurate water temperature difference can be provided for the follow-up determination of the oil temperature of the transmission system, and the accuracy of determining the oil temperature of the transmission system is improved.

S13, determining the oil temperature difference of the oil-water heat exchanger according to the heat dissipation power and the inlet oil flow;

the oil temperature difference is used for representing the difference value between the inlet oil temperature and the outlet oil temperature of the oil-water heat exchanger.

The lower temperature water that gets into through water inlet department at profit heat exchanger takes place the heat exchange to the higher oil of temperature that gets into through oil inlet department, cools off the oil temperature after, the higher temperature oil's that gets into through oil inlet department temperature can reduce to discharge through profit heat exchanger's oil-out department. Therefore, the oil temperature at the oil inlet of the oil-water heat exchanger is higher than the oil temperature at the oil outlet, and a difference value exists between the inlet oil temperature and the outlet oil temperature of the oil-water heat exchanger, namely the oil temperature difference of the oil-water heat exchanger.

Optionally, the obtained heat dissipation power of the oil-water heat exchanger is recorded as P, and a difference value c representing the temperature of the inlet oil and the temperature of the outlet oil of the oil-water heat exchanger can be obtained by calculating according to the heat dissipation power of the oil-water heat exchanger, so that the determination of the oil temperature difference of the oil-water heat exchanger is realized.

Alternatively, the oil temperature difference of the oil-water heat exchanger may be calculated and determined by the following equation (3):

b＝P/(C _oil(s) ×ρ _Oil ×Q _Oil(s) ) (3)

Wherein, C in the formula (3) _Oil Represents the liquid specific heat capacity, ρ, of the oil in the oil-water heat exchanger _Oil(s) Denotes the liquid density, Q, of the oil in the oil-water heat exchanger _Oil In oil-water heat exchangerInlet oil flow of (Q) _Oil(s) May be determined based on input conditions.

Therefore, the difference value between the inlet oil temperature and the outlet oil temperature of the oil-water heat exchanger can be calculated only according to the heat dissipation power and the inlet oil flow, the oil temperature difference of the oil-water heat exchanger is determined, the accurate oil temperature difference can be provided for subsequently determining the oil temperature of the transmission system, and the accuracy of determining the oil temperature of the transmission system is improved.

And S14, determining the oil temperature of the transmission system according to the logarithmic temperature difference, the water temperature difference, the oil temperature difference and the inlet water temperature.

The oil temperature of the transmission system is determined according to the logarithmic temperature difference, the water temperature difference, the oil temperature difference and the inlet water temperature, and the determination of the inlet oil temperature of the oil-water heat exchanger can be understood as the determination of the optimal input oil temperature of the transmission system.

Specifically, the oil temperature of the transmission system is determined through calculation according to the inlet water temperature of the oil-water heat exchanger accurately obtained in the steps S10 to S13 and the logarithmic temperature difference, the water temperature difference and the oil temperature difference of the oil-water heat exchanger determined through calculation.

Optionally, the obtained inlet water temperature of the oil-water heat exchanger is recorded as T, and the oil temperature T of the transmission system can be obtained by calculating according to the inlet water temperature T, the logarithmic temperature difference a, the water temperature difference b and the oil temperature difference c of the oil-water heat exchanger, so that the oil temperature of the transmission system is determined.

Alternatively, the oil temperature of the transmission system may be calculated by the following equation (4):

T＝(e ^（c-b)/s ×(t+c)-b-t)/(e ^(c-b)/a -1) (4)

therefore, the heat dissipation power of the oil-water heat exchanger of the transmission system of the vehicle is obtained, the water flow at the inlet, the oil flow at the inlet and the water temperature at the inlet are obtained, the logarithmic temperature difference of the oil-water heat exchanger is further determined, the water temperature difference and the oil temperature difference are determined, the oil temperature of the transmission system can be determined by calculating according to the logarithmic temperature difference of the oil-water heat exchanger, the water temperature difference and the oil temperature difference, the accurate oil temperature of the transmission system can be provided for developers at the initial development stage of the transmission system, the model of the transmission system can be conveniently and accurately selected, the problem of overhigh cost caused by unnecessary product redundancy is avoided, the oil temperature of the transmission system can be determined by simply calculating according to limited input values, a large number of parameters do not need to be obtained by consuming resources at the initial development stage of the product, system parts meeting the actual conditions can be selected according to the determined oil temperature, the method is simple and low in cost, and the system efficiency can be improved while the problem of thermal failure is solved.

By adopting the steps, the heat dissipation power of an oil-water heat exchanger of a vehicle transmission system is obtained, the inlet water flow, the inlet oil flow and the inlet water temperature of the oil-water heat exchanger of the transmission system are determined according to the input working condition of the vehicle, the logarithmic temperature difference for representing the temperature change of the oil-water heat exchanger is determined according to the heat dissipation power and the inlet water flow, the water temperature difference for representing the difference value between the inlet water temperature and the outlet water temperature in the oil-water heat exchanger is determined according to the heat dissipation power and the inlet oil flow, the oil temperature difference for representing the difference value between the inlet oil temperature and the outlet oil temperature in the oil-water heat exchanger is determined according to the heat dissipation power and the inlet oil flow, and finally the oil temperature of the transmission system is determined according to the determined logarithmic temperature difference, the water temperature difference, the oil temperature difference and the inlet water temperature. The purpose that the optimal input oil temperature of the transmission system can be accurately determined by simple calculation based on fewer working parameters in the initial stage of system development is achieved, and therefore the problem of thermal failure of the transmission system can be effectively avoided. In addition, according to the determined oil temperature of the transmission system, the type selection of parts such as an oil-water heat exchanger and an oil pump in the system can be powerfully supported at the initial stage of product development, and the design of the requirements on the external cooling water temperature and the water flow of the transmission system is realized, so that the type selection redundancy of all parts of the cooling system can be avoided, the system efficiency is improved while the system thermal failure problem is considered, and further the technical problems that the thermal failure problem of the transmission system is solved through simulation calculation in the related technology, the method is complex, the calculation period is long, and the efficiency is low are solved.

Optionally, in step S10, obtaining the heat dissipation power of the oil-water heat exchanger of the transmission system may include:

s100, determining a heat convection state of a transmission system and air;

and the heat convection state is used for indicating whether the transmission system carries out heat convection with air or not.

The oil-water heat exchanger of the transmission system is used for transferring heat generated by the transmission system, and it can be understood that when the transmission system only transfers heat through the oil-water heat exchanger, the heat required to be transferred by the oil-water heat exchanger is all the heat generated by the transmission system, but when the transmission system transfers heat through the oil-water heat exchanger, the heat is transferred through other heat dissipation modes, and the heat required to be transferred by the oil-water heat exchanger is only one part of the heat generated by the transmission system. Therefore, when determining the heat dissipation power of the oil-water heat exchanger, it is necessary to determine whether the heat quantity to be transferred by the oil-water heat exchanger is the total heat quantity generated by the transmission system.

Specifically, whether the heat quantity required to be transferred by the oil-water heat exchanger is the total heat quantity generated by the transmission system is determined by determining the heat convection state of the transmission system and the air. It will be understood that the state of convective heat transfer between the transmission system and the air represents the state of communication between the transmission system and the air, i.e. the state of convective heat transfer between the transmission system and the air can indicate whether the transmission system is in convective heat transfer with the air.

Alternatively, the convective heat transfer from the transmission to the air may be further determined by determining whether a coating is applied to the exterior of the transmission. If a wrapping layer is added outside the transmission system, the transmission system is isolated from the air and is in a non-circulation state with the air; if the outside of the transmission system is not coated, the transmission system is in a state of being communicated with the air. The outer casing of the transmission system may be a sound insulating material or a heat insulating material, and embodiments of the present invention are not limited thereto.

According to the determined heat convection state of the transmission system and the air, whether the heat quantity required to be transferred by the oil-water heat exchanger is all the heat quantity generated by the transmission system can be further determined, so that an accurate reference basis is provided for the subsequent process of determining the heat dissipation power of the oil-water heat exchanger, and the accuracy of the determined heat dissipation power of the oil-water heat exchanger is further ensured.

Step S101, responding to the fact that the transmission system does not carry out heat convection with air, and determining the heat generating power of the transmission system as heat dissipation power;

it can be understood that, when the transmission system does not exchange heat with the air by convection, that is, the transmission system is isolated from the air and is in a non-circulation state with the air, that is, the heat generated by the transmission system is transferred only by the oil-water heat exchanger, and at this time, the heat required to be transferred by the oil-water heat exchanger is all the heat generated by the transmission system. Therefore, when the transmission system does not exchange heat with air in a convection manner, the heat dissipated by the oil-water heat exchanger in unit time is equal to the heat generated by the transmission system in unit time, namely the heat dissipation power of the oil-water heat exchanger is the heat generation power of the transmission system.

In an alternative embodiment, the heat generating power of the transmission system may be calculated by simulation or experiment on a similar transmission system.

Specifically, if the currently designed transmission system is a new system, that is, when the 3D model of the transmission system does not exist, a transmission system of the same model as the transmission system whose heat generation power needs to be determined may be selected, and the corresponding heat generation power is calculated through simulation calculation, for example, by simulating the operating states of the transmission systems of the same model in different vehicle models and different working conditions; through experiments, for example, the transmission systems with the same model work under different vehicle types and different working conditions, and the corresponding heat generation power is calculated according to the heat generated by each mechanical part in the transmission systems.

In an alternative embodiment, the heat generating power of the transmission system may be calculated by simulation from a model of the transmission system.

Specifically, if the historical 3D model already exists in the currently designed transmission system, the 3D model may be selected, and the corresponding heat generation power may be calculated through model simulation calculation, for example, by simulating the operating state of the transmission system in different vehicle models and different working conditions.

And S102, responding to the heat convection between the transmission system and the air, and determining the heat dissipation power according to the input working condition.

It can be understood that, when the transmission system is in a state of circulation with air by heat convection with the air, that is, the heat generated by the transmission system is transferred by heat convection with the air in addition to the heat transfer by the oil-water heat exchanger, at this time, the heat required to be transferred by the oil-water heat exchanger is only a part of the heat generated by the transmission system, and the heat dissipation power of the oil-water heat exchanger needs to be determined according to the input working condition.

Optionally, in step S102, determining the heat dissipation power according to the input operating condition may include:

and step S1020, determining the heat dissipation power according to the type of the vehicle, the type of the transmission system and the vehicle speed of the vehicle in the input working condition.

It can be understood that when the transmission system is in a state of being communicated with air, the running speed of the vehicle also influences the heat convection between the transmission system and the air, and further influences the determination of the heat dissipation power of the oil-water heat exchanger. In addition, the type of vehicle and the type of transmission system are different, so that the heat transferred between the transmission system and the air through convective heat transfer is not fixed, and the determination of the heat dissipation power of the oil-water heat exchanger is influenced. Therefore, the heat dissipation power of the oil-water heat exchanger needs to be determined according to the type of the vehicle, the type of a transmission system and the vehicle speed of the vehicle in the input working condition.

Specifically, through the corresponding relation between the vehicle speed and the heat convection between the transmission system and the air, it can be determined that the transmission system accounts for the heat transferred by the heat convection with the air in the heat generated by the transmission system at a certain vehicle speed, and then the heat transferred by the oil-water heat exchanger accounts for the heat generated by the transmission system, namely the heat dissipation power of the oil-water heat exchanger is determined. It can be appreciated that the faster the vehicle speed, the higher the heat transferred by the transmission system in heat convection with the air, and the lower the heat transferred through the oil-water heat exchanger.

For example, based on the corresponding relationship between the vehicle speed and the heat convection between the transmission system and the air, in general, when the vehicle speed is 40km/h, the proportion of the heat transferred by the transmission system through the heat convection with the air in the heat generated by the transmission system is 30-40%, and then the proportion of the heat transferred by the transmission system through the oil-water heat exchanger in the heat generated by the transmission system is 1- (30-40%), namely the heat dissipation power of the oil-water heat exchanger is 1- (30-40%) of the heat generation power of the transmission system; when the vehicle speed is 90km/h, the proportion of the heat transferred by the transmission system through heat convection with air in the heat generated by the transmission system is 45-55%, and the proportion of the heat transferred by the transmission system through the oil-water heat exchanger in the heat generated by the transmission system is 1- (45-55%), namely the heat dissipation power of the oil-water heat exchanger is 1- (45-55%) of the heat generation power of the transmission system. It can be understood that the type of the vehicle and the type of the transmission system are different, and the corresponding relationship between the vehicle speed and the convective heat transfer between the transmission system and the air is also different, and when the heat dissipation power of the oil-water heat exchanger is determined according to the corresponding relationship between the vehicle speed and the convective heat transfer between the transmission system and the air, the heat dissipation power needs to be determined according to the type of the vehicle, the type of the transmission system and the vehicle speed of the vehicle in the input working condition.

Alternatively, the speed of the vehicle may be determined by simulating different operating conditions of the vehicle, for example by determining the speed of the vehicle given the torque and speed of the vehicle driveline under different operating conditions. At the initial stage of product development, the vehicle speed under different vehicle types, different products and different working conditions can be measured in a simulation mode, and therefore the vehicle speed meeting the required condition is provided in the process of determining the heat dissipation power of the oil-water heat exchanger.

From this, can determine corresponding oil water heat exchanger's radiating power according to transmission system's particular case to can provide accurate oil water heat exchanger's radiating power for follow-up definite transmission system's oil temperature in-process, and then make transmission system's radiating condition under the various different conditions just can be considered at the product development initial stage, guarantee oil water heat exchanger's heat-sinking capability simultaneously and satisfy the heat dissipation requirement, effectively avoid the thermal failure problem.

Optionally, in step S11, determining the logarithmic temperature difference of the oil-water heat exchanger according to the heat dissipation power may include the following steps:

and step S110, determining the logarithmic temperature difference according to the thermal resistance and the heat dissipation power of the oil-water heat exchanger.

When the oil-water heat exchanger works, the heat exchange between two liquid media of oil and water is realized through the internal thermal resistance, and the internal resistance of the general oil-water heat exchanger comprises: the heat transfer convection resistance of the hot fluid and the solid wall, the heat conduction resistance of the solid wall and dirt and the heat transfer convection resistance of the cold fluid and the solid wall are connected in series to form total heat resistance.

Optionally, the thermal resistance of the oil-water heat exchanger may be obtained through simulation or experimental data provided by a heat exchanger manufacturer, and the thermal resistances of the oil-water heat exchangers of the same type under different working conditions are obtained according to the provided simulation or experimental data.

And calculating according to the thermal resistance and the heat dissipation power of the oil-water heat exchanger to determine the logarithmic temperature difference of the oil-water heat exchanger, and specifically, reference may be made to the description of step S11, which is not described in detail herein.

Optionally, in step S12, determining the water temperature difference of the oil-water heat exchanger according to the heat dissipation power and the inlet water flow rate may include the following steps:

and step S120, determining the water temperature difference according to the specific heat capacity of water, the density of water, the heat dissipation power and the inlet water flow.

And calculating according to the specific heat capacity of the water, the density of the water, the heat dissipation power and the inlet water flow rate, and determining the water temperature difference of the oil-water heat exchanger, specifically, reference may be made to the description of step S12, which is not described herein in any more detail.

From this, only the water temperature difference that the oily water heat exchanger was confirmed according to different operating modes to the entry water flow of inputing under according to different work condition just can determine oily water heat exchanger, and need not to calculate through the export water flow that acquires oily water heat exchanger to can reduce the parameter and acquire at the product development initial stage, can determine accurate oily water heat exchanger's water temperature difference simultaneously, and then reduce cost improves system efficiency.

Optionally, in step S13, determining the oil temperature difference of the oil-water heat exchanger according to the heat dissipation power and the inlet oil flow may include the following steps:

and step S130, determining the temperature difference of the oil according to the specific heat capacity of the oil, the density of the oil, the heat dissipation power and the flow of the inlet oil.

And calculating according to the specific heat capacity of the oil, the density of the oil, the heat dissipation power and the inlet oil flow, and determining the oil temperature difference of the oil-water heat exchanger, specifically, reference may be made to the description of step S13, which is not described herein in any more detail.

From this, only the input just can determine the oil temperature difference of oil water heat exchanger according to the oil water heat exchanger's of confirming under the different work condition entry oil flow, and need not to calculate through the export oil flow that acquires oil water heat exchanger to can reduce the parameter and acquire at the product development initial stage, can confirm accurate oil water heat exchanger's the oil temperature difference simultaneously, and then reduce cost improves system efficiency.

Through the steps, the oil temperature of the transmission system can be determined through simple calculation only by inputting the heat dissipation power, the inlet water flow, the inlet oil flow and the inlet water temperature of the oil-water heat exchanger, resources are not required to be consumed to obtain a large number of parameters at the initial stage of product development, system parts meeting actual conditions can be selected according to the determined oil temperature, the method is simple, the cost is low, and the system efficiency can be improved while the thermal failure problem is considered.

Through the above description of the embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but the former is a better implementation mode in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present invention.

In this embodiment, an oil temperature determination device for a transmission system in a vehicle is further provided, and the device is used to implement the above embodiments and preferred embodiments, which have already been described and will not be described again. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware, or a combination of software and hardware is also possible and contemplated.

Fig. 2 is a block diagram of a configuration of an oil temperature determining apparatus of a transmission system in a vehicle according to an embodiment of the present invention, which is exemplified by an oil temperature determining apparatus 200 of a transmission system in a vehicle as shown in fig. 2, and includes: the obtaining module 201 is used for obtaining working parameters of the oil-water heat exchanger of the transmission system, wherein the working parameters at least include: the heat dissipation power, the inlet water flow, the inlet oil flow and the inlet water temperature are determined according to the input working condition of the vehicle; the first determining module 202 is used for determining the logarithmic temperature difference of the oil-water heat exchanger according to the heat dissipation power, wherein the logarithmic temperature difference is used for representing the temperature change of the oil-water heat exchanger; the second determining module 203 is used for determining the water temperature difference of the oil-water heat exchanger according to the heat dissipation power and the inlet water flow, wherein the water temperature difference is used for representing the difference value between the inlet water temperature and the outlet water temperature of the oil-water heat exchanger; a third determining module 204, wherein the third determining module 204 is configured to determine an oil temperature difference of the oil-water heat exchanger according to the heat dissipation power and the inlet oil flow, and the oil temperature difference is used to represent a difference between an inlet oil temperature and an outlet oil temperature of the oil-water heat exchanger; a fourth determination module 205, the fourth determination module 205 to determine an oil temperature of the transmission system based on the logarithmic temperature difference, the water temperature difference, the oil temperature difference, and the inlet water temperature.

Optionally, the obtaining module 201 is further configured to determine a heat convection state between the transmission system and air, where the heat convection state is used to indicate whether the transmission system is in heat convection with the air; determining the heat generating power of the transmission system as the heat dissipation power in response to the fact that the transmission system does not exchange heat with air in a convection mode; and responding to the heat convection between the transmission system and the air, and determining the heat dissipation power according to the input working condition.

Optionally, the obtaining module 201 is further configured to determine the heat dissipation power according to the type of the vehicle, the type of the transmission system, and the vehicle speed of the vehicle in the input operating condition.

Optionally, the first determining module 202 is further configured to determine a logarithmic temperature difference according to the thermal resistance and the heat dissipation power of the oil-water heat exchanger.

Optionally, the second determining module 203 is further configured to determine the water temperature difference according to the specific heat capacity of water, the density of water, the heat dissipation power, and the inlet water flow rate.

Optionally, the third determination module 204 is further configured to determine the oil temperature difference according to a specific heat capacity of the oil, a density of the oil, a heat dissipation power, and an inlet oil flow.

There is also provided, in accordance with an embodiment of the present invention, a processor for executing a program, wherein the program is arranged to execute the method for determining an oil temperature of a transmission system in a vehicle as in any one of the above.

It should be noted that, the above modules may be implemented by software or hardware, and for the latter, the following may be implemented, but not limited to: the modules are all positioned in the same processor; alternatively, the modules are respectively located in different processors in any combination.

There is further provided, according to an embodiment of the present invention, a processor configured to execute a program, where the program is configured to perform the steps in any of the above method embodiments when executed.

Optionally, in this embodiment, the processor may be configured to execute the following steps by a computer program:

the method comprises the following steps of S1, obtaining working parameters of an oil-water heat exchanger of a transmission system;

s2, determining logarithmic temperature difference of the oil-water heat exchanger according to the heat dissipation power;

s3, determining the water temperature difference of the oil-water heat exchanger according to the heat dissipation power and the inlet water flow;

s4, determining the oil temperature difference of the oil-water heat exchanger according to the heat dissipation power and the inlet oil flow;

and S5, determining the oil temperature of the transmission system according to the logarithmic temperature difference, the water temperature difference, the oil temperature difference and the inlet water temperature.

An embodiment of the present invention further provides a computer-readable storage medium having a computer program stored therein, wherein the computer program is configured to perform the steps of any of the above method embodiments when the computer program runs on a computer or a processor.

Alternatively, in the present embodiment, the above-mentioned computer-readable storage medium may be configured to store a computer program for executing the steps of:

s1, acquiring working parameters of an oil-water heat exchanger of a transmission system;

Optionally, in this embodiment, the computer-readable storage medium may include, but is not limited to: various media capable of storing computer programs, such as a usb disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic disk, or an optical disk.

Embodiments of the present invention also provide an electronic device, comprising a memory and a processor, wherein the memory stores a computer program, and the processor is configured to execute the computer program to perform the steps of any of the above method embodiments.

Optionally, in this embodiment, the processor in the electronic device may be configured to run the computer program to perform the following steps:

Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments and optional implementation manners, and this embodiment is not described herein again.

The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.

In the above embodiments of the present invention, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

In the embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units may be a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic disk, or an optical disk.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and amendments can be made without departing from the principle of the present invention, and these modifications and amendments should also be considered as the protection scope of the present invention.

Claims

1. A method of determining an oil temperature of a transmission system in a vehicle, comprising:

acquiring working parameters of an oil-water heat exchanger of the transmission system, wherein the working parameters at least comprise: the system comprises the following components of heat dissipation power, inlet water flow, inlet oil flow and inlet water temperature, wherein the inlet water flow, the inlet oil flow and the inlet water temperature are determined according to input working conditions of the vehicle;

determining a logarithmic temperature difference of the oil-water heat exchanger according to the heat dissipation power, wherein the logarithmic temperature difference is used for representing the temperature change of the oil-water heat exchanger;

determining the water temperature difference of the oil-water heat exchanger according to the heat dissipation power and the inlet water flow, wherein the water temperature difference is used for representing the difference value between the inlet water temperature and the outlet water temperature of the oil-water heat exchanger;

determining an oil temperature difference of the oil-water heat exchanger according to the heat dissipation power and the inlet oil flow, wherein the oil temperature difference is used for representing a difference value between an inlet oil temperature and an outlet oil temperature of the oil-water heat exchanger;

and determining the oil temperature of the transmission system according to the logarithmic temperature difference, the water temperature difference, the oil temperature difference and the inlet water temperature.

2. The method of claim 1, wherein the deriving heat dissipation power of a hydro-thermal exchanger of the drive train comprises:

determining a convective heat transfer state of the transmission system and air, wherein the convective heat transfer state is used for indicating whether the transmission system is in convective heat transfer with the air;

in response to the transmission not being in convective heat exchange with the air, determining a heat generating power of the transmission to be the heat dissipating power;

and responding to the heat convection of the transmission system and the air, and determining the heat dissipation power according to the input working condition.

3. The method of claim 2, wherein the determining the heat dissipation power according to the input operating condition comprises:

and determining the heat dissipation power according to the type of the vehicle, the type of the transmission system and the vehicle speed of the vehicle in the input working condition.

4. The method of claim 3, wherein the determining the log delta temperature of the recuperator as a function of the heat dissipation power comprises:

and determining the logarithmic temperature difference according to the thermal resistance of the oil-water heat exchanger and the heat dissipation power.

5. The method of claim 4, wherein determining the water temperature difference of the recuperator as a function of the heat rejection power and the inlet water flow rate comprises:

and determining the water temperature difference according to the specific heat capacity of water, the density of water, the heat dissipation power and the inlet water flow.

6. The method of any of claims 1-5, wherein the determining the oil temperature differential of the oil-water heat exchanger from the heat rejection power and the inlet oil flow comprises:

and determining the oil temperature difference according to the specific heat capacity of the oil, the density of the oil, the heat dissipation power and the inlet oil flow.

7. An oil temperature determining apparatus of a transmission system in a vehicle, comprising:

the acquisition module is used for acquiring working parameters of an oil-water heat exchanger of the transmission system, wherein the working parameters at least comprise: the system comprises heat dissipation power, inlet water flow, inlet oil flow and inlet water temperature, wherein the inlet water flow, the inlet oil flow and the inlet water temperature are determined according to input working conditions of the vehicle;

the first determining module is used for determining the logarithmic temperature difference of the oil-water heat exchanger according to the heat dissipation power, wherein the logarithmic temperature difference is used for representing the temperature change of the oil-water heat exchanger;

a second determination module, configured to determine a water temperature difference of the oil-water heat exchanger according to the heat dissipation power and the inlet water flow, where the water temperature difference is used to represent a difference between an inlet water temperature and an outlet water temperature of the oil-water heat exchanger;

a third determination module, configured to determine an oil temperature difference of the oil-water heat exchanger according to the heat dissipation power and the inlet oil flow, where the oil temperature difference is used to represent a difference between an inlet oil temperature and an outlet oil temperature of the oil-water heat exchanger;

a fourth determination module to determine an oil temperature of the transmission system based on the logarithmic temperature difference, the water temperature difference, the oil temperature difference, and the inlet water temperature.

8. A processor characterized in that the processor is configured to run a program, wherein the program is configured to perform the method for determining the oil temperature of a transmission system in a vehicle as claimed in any one of claims 1 to 6 when run on the processor.

9. A computer-readable storage medium, in which a computer program is stored, wherein the computer program is arranged to, when run on a computer or a processor, perform a method for determining an oil temperature of a transmission system in a vehicle as claimed in any one of the preceding claims 1 to 6.

10. An electronic device comprising a memory and a processor, wherein the memory has stored therein a computer program, and the processor is configured to execute the computer program to perform the method for determining an oil temperature of a transmission system in a vehicle as set forth in any one of claims 1 to 6.