Automobile speed limiting method and device during backing of electric automobile and electric automobile

Abstract

The invention discloses an automobile speed limiting method and device during backing of an electric automobile and an electric automobile. The method comprises the following steps of detecting current speed of the electric automobile and detecting the opening of an accelerating pedal of the electric automobile; obtaining an analyzed torque of the accelerating pedal as a desired torque of the electric automobile according to the opening of the accelerating pedal before the current speed of the electric automobile reaches a first target speed; when the current speed of the electric automobile is higher than the first target speed, controlling the electric automobile to enter a speed closed-loop control mode, performing proportional integral (PI) control according to a given second target speed and the current speed of the electric automobile to obtain a closed-loop control torque when the electric automobile is in the speed closed-loop control mode, and using the closed-loop control torque as a desired torque, wherein the second target speed is higher than the first target speed; and controlling a motor of the electric automobile according to the desired torque to limit the speed of the electric automobile. Through adoption of the automobile speed limiting method disclosed by the embodiment of the invention, the safety and comfort of the electric automobile are enhanced.

Description

technical field [0001] The invention relates to the technical field of vehicles, in particular to a method and device for limiting the speed of an electric vehicle when reversing, and the electric vehicle. Background technique [0002] During the driving process of the vehicle, excessive speed poses a serious threat to the vehicle and personal safety. Especially in the process of reversing, the danger is increased due to the limitation of the driver's field of vision, so the control of the vehicle speed is very important. In a vehicle equipped with a gearbox, the reverse speed is limited to a certain range by the mechanical structural characteristics of the gearbox, while in a direct-drive pure electric vehicle, the speed limit can only be achieved by limiting the motor speed. [0003] For the speed limit of pure electric vehicles, the control methods adopted in related technologies basically analyze the difference between the current speed and the control target speed to ob...

AI Technical Summary

Problems solved by technology

The above-mentioned second control method compares the current speed of the motor with the set speed value, and uses different methods to give the required torque in different speed ranges. This method switches between multiple groups of speed ranges, which will also cause rotation Torque jumps, and the speed cannot be limited to a relatively stable range

resulting in a poor user experience

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