Pure electric vehicle overspeed control method and device

Abstract

The invention relates to a pure electric vehicle overspeed control method and a device. The method comprises the steps that firstly, the real-time vehicle speed of a vehicle is collected; if the real-time vehicle speed is larger than or equal to a set value, the braking torque of a motor at the current rotating speed is distributed to a driving motor for braking; wherein a safe vehicle speed is greater than the set value; the values of the real-time vehicle speed and the safe vehicle speed are compared continuously; if the real-time vehicle speed is larger than or equal to the safe vehicle speed, the brake pedal opening degree is controlled to be increased, and the brake pedal opening degree is further increased along with increasing of the vehicle speed; wherein the safe vehicle speed ofthe vehicle is calculated according to a motor rotating speed and vehicle parameters. That is to say, under the condition of going down a long slope, even if the braking torque of the motor is distributed to the driving motor for braking, the situation that the vehicle speed continues to be increased exists, overspeed is effectively limited by controlling the brake pedal opening degree, and the problem that a vehicle is unsafe in the running process is solved.

Description

technical field [0001] The invention belongs to the field of pure electric vehicle control, and in particular relates to a method and device for controlling overspeed of a pure electric vehicle. Background technique [0002] In recent years, with the continuous growth of car ownership, the ensuing increasingly severe environmental pollution and energy crisis have brought a huge impact on the traditional auto industry. Automobile energy saving and environmental protection have become the focus of attention in the field of automobiles. Therefore, the development of new energy vehicles with high energy efficiency and low emissions has attracted more and more attention. [0003] As a type of new energy vehicle, a pure electric vehicle is driven by a motor, and the engine is eliminated. At the same time, the characteristics of the motor enable the motor to be controlled to operate as a generator. When decelerating or braking, the motor reverses the drag torque to realize energy r...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a pure electric vehicle overspeed control method and device to solve the problem of braking by distributing the braking torque of the motor to the driving motor even when the vehicle has no driving force when going downhill. Speeding may also cause unsafe driving of the vehicle

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