Electric automobile power system output torque control method and device

Abstract

The invention provides an electric automobile power system output torque control method and device. The electric automobile power system output torque control method comprises the steps that the corresponding maximum torque value of an ISG motor and the corresponding maximum torque value of a TM motor are obtained according to the current movement state of an electric automobile; the power limiting value corresponding to a working mode of a high-voltage battery is obtained; the first torque limiting value of the ISG motor and the first torque limiting value of the TM motor are obtained separately according to the power limiting value of the high-voltage battery and the power distribution relationship between the ISG motor and the TM motor under the current movement state of the electric automobile; the maximum torque value, the first torque limiting value and the preset second torque limiting value of the ISG motor are compared, and the minimum value is selected as the torque limiting value of the ISG motor; and the maximum torque value, the first torque limiting value and the preset second torque limiting value of the TM motor are compared, and the minimum value is selected as the torque limiting value of the TM motor. By adopting the electric automobile power system output torque control method and device, the torque limiting precision can be improved.

Description

technical field [0001] The invention relates to the field of electric vehicles, in particular to a method and device for controlling output torque of a power system of an electric vehicle. Background technique [0002] Electric vehicles refer to vehicles powered by on-board batteries and driven by motors. The types of electric vehicles include pure electric vehicles, hybrid vehicles and fuel cell vehicles. [0003] The existing electric vehicles are mainly hybrid vehicles. Hybrid vehicles generally refer to vehicles equipped with two or more power sources (one of which is a motor). , to achieve the optimal energy distribution strategy, to achieve low energy consumption and low pollution. [0004] A hybrid vehicle has two power sources: the engine and the motor. The vehicle controller sends torque control commands to the engine controller and the motor controller respectively according to the current running state of the vehicle. The engine controller and the motor controll...

AI Technical Summary

Problems solved by technology

[0005] Although the above torque limiting method for the power system of a hybrid electric vehicle can protect automobile parts and improve driving stability to a certain extent, it still has certain limitations.

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