CN-121997521-A - Simulation model building method and related device of vehicle power system

CN121997521ACN 121997521 ACN121997521 ACN 121997521ACN-121997521-A

Abstract

The application discloses a method for establishing a simulation model of a vehicle power system and a related device, which relate to the technical field of simulation, the component simulation unit and the sub simulation units included in the component simulation unit are constructed, a two-layer structure is constructed based on the topological structure and the heat interaction, the heat interaction is refined to the inside of the component simulation unit, and the accuracy of determining the local temperature by using the simulation model is improved. And constructing a first mapping relation and a second mapping relation, and configuring performance parameters of the component simulation unit and the sub-simulation unit at different temperatures. And constructing thermodynamic equations of the sub-simulation units. The temperature of the sub-simulation unit is determined based on a thermodynamic equation, so that the temperature change conditions of the simulation unit and the sub-simulation unit are more accurate, the heat transfer process of the vehicle power system is subjected to fine simulation, and technical support is provided for researching the problem of local overheating.

Inventors

JIAO WEI
LONG YIMING

Assignees

上海汽车集团股份有限公司

Dates

Publication Date: 20260508
Application Date: 20241107

Claims (10)

1. A method for building a simulation model of a vehicle powertrain, the method comprising: According to a part topological structure of a vehicle power system, a part simulation unit and a connection relation between the part simulation units are built, wherein the simulation model is used for simulating the vehicle power system, the part simulation unit corresponds to a part included in the vehicle power system, and the part simulation unit is used for simulating the corresponding part; Determining a target sub-component with performance affected by temperature change according to temperature performance information of the sub-component included by the corresponding component, and establishing a sub-simulation unit included by the component simulation unit and a connection relation between the sub-simulation units, wherein the sub-simulation unit is used for simulating the target sub-component, and the temperature performance information is used for describing the performance of the sub-component at different temperatures; Constructing a first mapping relation and a second mapping relation according to the performance information of the component, wherein the first mapping relation is a mapping relation between the temperature of the component simulation unit and the performance parameter of the component simulation unit, and the second mapping relation is a mapping relation between the temperature of the sub-simulation unit and the performance parameter of the sub-simulation unit; And constructing a thermodynamic equation of the sub-simulation unit according to the system parameters of the vehicle power system, wherein the thermodynamic equation is used for describing the heat state change process of the sub-simulation unit.
2. The method according to claim 1, wherein the method further comprises: acquiring initial simulation parameters, wherein the initial simulation parameters are determined according to the operation parameters of the vehicle power system under the target working condition; setting the initial simulation parameters for the simulation model; And controlling the operation of the simulation model to obtain a simulation result aiming at the target working condition, wherein the simulation result comprises the temperature of the sub-simulation unit in the operation process.
3. The method according to claim 2, wherein the method further comprises: taking a sub-simulation unit with the temperature meeting the unit failure condition as a failure unit; generating unit failure information, wherein the unit failure information comprises unit information of a failed unit and failure time of the failed unit.
4. A method according to claim 3, characterized in that the method further comprises: And generating a failure tree diagram according to the unit failure information, wherein the failure tree diagram comprises nodes and directed edges, the nodes are used for representing the failure units, and the directed edges are used for representing the failure sequence of the failure units.
5. The method of claim 1, wherein the first mapping and the second mapping comprise one or more of the following mappings: The mapping relation between the temperature meeting the normal operation condition and the performance parameter of the normal operation, the mapping relation between the temperature meeting the partial failure condition and the performance parameter of the partial failure, and the mapping relation between the temperature meeting the failure condition and the performance parameter of the failure.
6. The method of claim 1, wherein constructing thermodynamic equations for the sub-simulation units based on system parameters of the vehicle powertrain system comprises: Constructing a physics equation according to system parameters of the vehicle power system, wherein the physics equation is used for reflecting interaction between the sub-simulation units and comprises one or more of a mechanical differential equation and an electromagnetic differential equation, and parameters related to temperature in the physics equation are variables; determining a thermal expression of the sub-simulation unit according to the physics equation; and constructing a heat balance equation of the sub-simulation unit according to the heat expression.
7. The method of any one of claims 1-6, wherein the first mapping and the second mapping are represented using a data table; or the first mapping relation and the second mapping relation are expressed by adopting a function expression.
8. A simulation model establishing apparatus of a vehicle power system, characterized by comprising: The first building unit is used for building a part simulation unit included in a simulation model and a connection relation between the part simulation units according to a part topological structure of the vehicle power system, the simulation model is used for simulating the vehicle power system, the part simulation unit corresponds to a part included in the vehicle power system, and the part simulation unit is used for simulating the corresponding part; A second establishing unit, configured to determine a target sub-component whose performance is affected by temperature change according to temperature performance information of a sub-component included in the corresponding component, and establish a sub-simulation unit included in the component simulation unit and a connection relationship between the sub-simulation units, where the sub-simulation unit is configured to simulate the target sub-component, and the temperature performance information is configured to describe performance of the sub-component at different temperatures; a third establishing unit, configured to establish a first mapping relationship and a second mapping relationship according to the performance information of the component, where the first mapping relationship is a mapping relationship between a temperature of the component simulation unit and a performance parameter of the component simulation unit, and the second mapping relationship is a mapping relationship between a temperature of the sub-simulation unit and a performance parameter of the sub-simulation unit; And the fourth establishing unit is used for establishing a thermodynamic equation of the sub-simulation unit according to the system parameters of the vehicle power system, wherein the thermodynamic equation is used for describing the heat state change process of the sub-simulation unit.
9. An apparatus comprising a processor, a memory, and a system bus; The processor and the memory are connected through the system bus; the memory is for storing one or more programs, the one or more programs comprising instructions, which when executed by the processor, cause the processor to perform the method of any of claims 1-7.
10. A computer readable storage medium, characterized in that the computer readable storage medium has stored therein instructions, which when run on a terminal device, cause the terminal device to perform the method of any of claims 1-7.

Description

Simulation model building method and related device of vehicle power system Technical Field The application relates to the technical field of simulation, in particular to a simulation model building method and a related device of a vehicle power system. Background A vehicle powertrain is a mechanical system that transmits power generated by an engine or motor through a series of power transmissions, ultimately to the wheels. The vehicle powertrain is a central component of the vehicle. The performance of a vehicle powertrain affects the basic functions of the vehicle. In the process of constructing or testing the vehicle power system, the vehicle power system is subjected to simulation processing, and a simulation model for simulating the vehicle power system is constructed. And running the simulation model to simulate the running process of the vehicle power system. And determining possible problems in the running process of the vehicle power system according to the running result of the simulation model so as to adjust the vehicle power system. At present, the simulation mode of a vehicle power system is not fine enough. Especially for some more complex vehicle powertrain systems, such as electrically driven vehicle powertrain systems. The oversimplified simulation mode leads to the fact that the simulation model does not support the simulation of the running process of the vehicle power system under the special working condition, and the simulation model cannot be used for realizing the accurate simulation of the vehicle power system. Disclosure of Invention In view of the above, the application provides a method and a related device for establishing a simulation model of a vehicle power system, which can realize the fine simulation of the heat transfer process of the vehicle power system and improve the accuracy of the simulation result. The technical scheme provided by the application is as follows: in a first aspect, the present application provides a method for establishing a simulation model of a vehicle powertrain, the method comprising: According to a part topological structure of a vehicle power system, a part simulation unit and a connection relation between the part simulation units are built, wherein the simulation model is used for simulating the vehicle power system, the part simulation unit corresponds to a part included in the vehicle power system, and the part simulation unit is used for simulating the corresponding part; Determining a target sub-component with performance affected by temperature change according to temperature performance information of the sub-component included by the corresponding component, and establishing a sub-simulation unit included by the component simulation unit and a connection relation between the sub-simulation units, wherein the sub-simulation unit is used for simulating the target sub-component, and the temperature performance information is used for describing the performance of the sub-component at different temperatures; Constructing a first mapping relation and a second mapping relation according to the performance information of the component, wherein the first mapping relation is a mapping relation between the temperature of the component simulation unit and the performance parameter of the component simulation unit, and the second mapping relation is a mapping relation between the temperature of the sub-simulation unit and the performance parameter of the sub-simulation unit; And constructing a thermodynamic equation of the sub-simulation unit according to the system parameters of the vehicle power system, wherein the thermodynamic equation is used for describing the heat state change process of the sub-simulation unit. In one possible implementation, the method further includes: acquiring initial simulation parameters, wherein the initial simulation parameters are determined according to the operation parameters of the vehicle power system under the target working condition; setting the initial simulation parameters for the simulation model; And controlling the operation of the simulation model to obtain a simulation result aiming at the target working condition, wherein the simulation result comprises the temperature of the sub-simulation unit in the operation process. In one possible implementation, the method further includes: taking a sub-simulation unit with the temperature meeting the unit failure condition as a failure unit; generating unit failure information, wherein the unit failure information comprises unit information of a failed unit and failure time of the failed unit. In one possible implementation, the method further includes: And generating a failure tree diagram according to the unit failure information, wherein the failure tree diagram comprises nodes and directed edges, the nodes are used for representing the failure units, and the directed edges are used for representing the failure sequence of the failure units. In one poss