A method for controlling the maximum speed of an electric vehicle and a vehicle controller

Abstract

The invention discloses an electric automobile maximum speed control method and a vehicle control unit, and relates to the field of vehicle control of an electric automobile. The electric automobile maximum speed control method comprises the following steps that when the electric automobile travels, the vehicle control unit detects the current speed of the electric automobile; when the vehicle control unit detects that the current speed of the electric automobile is in a secondary high speed range, the vehicle control unit determines a target torque of a motor according to a motor corrected external characteristic mode based on the driving intention of a driver; and when the vehicle control unit detects that the current speed of the electric automobile is in a maximum speed range, the vehicle control unit determines the target torque of the motor according to a maximum speed closed-loop control mode based on the driving intention of the driver. According to the electric automobile maximum speed control method and the vehicle control unit disclosed by the embodiment of the invention, the automobile can be guaranteed to travel smoothly at a relatively high speed area.

Description

technical field [0001] The invention relates to the field of electric vehicle control, in particular to a method for controlling the maximum speed of an electric vehicle and a vehicle controller. Background technique [0002] The research on electric vehicles is emerging when environmental protection and energy issues are increasingly concerned. In order to cope with environmental and energy crises, the development and large-scale use of electric vehicles has become an inevitable trend. In the process of globalization, improving the driving safety performance and driving comfort of the whole vehicle is an important topic in the research of electric vehicles. [0003] Because the electric vehicle is driven by a motor, the characteristics of the motor are completely different from those of the traditional engine. Therefore, in the control of various working conditions such as vehicle starting, acceleration and deceleration, and maximum speed, it is necessary to use unique cont...

AI Technical Summary

Problems solved by technology

[0004] Because the motor has the function of stepless speed change, the electric vehicle omits the gearbox or automatic transmission of the traditional car, making the driving structure simpler, but the unique external characteristics of the electric vehicle drive motor, when the motor speed exceeds the maximum speed limit At this time, the vehicle controller must release the motor load immediately in order to protect the safety of the motor. After the motor speed decreases, if the vehicle controller judges that the driver still has the intention to accelerate, the motor load must be applied again. Reciprocating release and application of the motor load will cause The vehicle shakes, which leads to a decrease in the smoothness of the vehicle, which is not conducive to the safe driving of electric vehicles. The driver must reduce the speed of the vehicle to ensure the smooth driving of the vehicle in a relatively high-speed area

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