Simulation analysis method for driving performance index of pure electric bus based on motor thermal coupling

Abstract

The invention discloses a simulation analysis method for driving performance indexes of a pure electric bus based on motor thermal coupling. The method comprises the following steps: calculating thermal parameters of a motor model and a heat generation rate and a heat dissipation rate in temperature field analysis; establishing the motor model in Ansys Workbench, and carrying out input, grid division and simulation of boundary conditions and loads; establishing a motor thermal coupling model in Simulink, and verifying the motor thermal coupling model established in the Simulink by using the motor model established in the Ansys Workbench; establishing a battery model, a speed reducer model, a whole vehicle dynamics model and a driver model in the Simulink, and establishing a whole vehicle model in combination with the motor thermal coupling model; and simulating the whole vehicle model, and analyzing influences of motor thermal coupling on driving performance indexes of a pure electric bus. According to the method provided by the invention, influences of motor temperature rise on whole vehicle driving indexes of a pure electric bus can be known in advance, so that strategy adjustment can be made in time, and a series of problems caused by motor overheating are avoided.

Description

technical field [0001] The invention relates to the field of analysis of pure electric passenger cars, in particular to a simulation analysis method for driving performance indexes of pure electric passenger cars based on motor thermal coupling. Background technique [0002] In the hot summer, it is very easy for the motor temperature to be too high. Once it occurs, and the motor cooling system of the electric bus is not turned on in time or fails, it may directly affect the normal operation of the pure electric bus, thereby reducing the working efficiency and service life of the bus, which will not only cause huge economic losses, but also cause major personnel losses. casualties. [0003] Chinese invention patent CN108763165A proposes a method for calculating the temperature of a hybrid electric motor, which can deduce the change of the preset motor temperature according to some working condition parameters. This patent is only applicable to the motor field, and it is di...

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Problems solved by technology

This patent is only applicable to the motor field, and it is difficult to layout it into the calculation of the vehicle model

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