Anti-slope control method, device and electric vehicle

Abstract

The invention relates to the technical field of electric vehicles, and provides a sliding-on-slope prevention method and device, and an electric automobile. The electric vehicle comprises a motor, andemploys a PID control system. The PID control system comprises a PID speed loop and a PID current loop. The method comprises: when the electric vehicle is in a state of sliding-on-slope, the currentspeed of the electric vehicle is obtained; based on the current of the motor and the current speed, the steady current value of the electric vehicle is calculated by using the law of conservation of energy; compensation current is calculated based on the steady current value; the actual revolving speed of the motor is input into the PID speed loop, and calculation is carried out to obtain torque current; and the compensation current and the torque current are input to the PID current loop to control the electric vehicle. The method provided by the embodiment of the invention calculates the steady current based on the law of conservation of energy for compensating the PID control, and the distance of sliding-on-slope can be effectively shortened on the basis of ensuring control smoothness.

Description

technical field [0001] The present invention relates to the technical field of electric vehicles, in particular to a slope prevention control method and device and an electric vehicle. Background technique [0002] An electric vehicle refers to a vehicle powered by an on-board power supply and driven by a motor to drive the wheels. Because it has less impact on the environment than traditional cars, it is the development direction of future cars. Like traditional cars, the anti-rolling function of electric vehicles is as important. Because when starting on a slope, if there is no anti-slope function, the body will slide down before the brake is released and the accelerator responds, which may cause the risk of collision with the rear car. In order to reduce the slope distance as much as possible, it is necessary to add a reverse braking torque to the motor to stabilize the vehicle body. [0003] At present, the commonly used anti-slope control methods for electric vehicle...

AI Technical Summary

Problems solved by technology

[0003] At present, the commonly used anti-slope control methods for electric vehicles include the use of inclination sensors and PID speed closed-loop control. These methods inevitably have some disadvantages, such as the high cost of inclination sensors.

However, the traditional PID control method is not effective in the large inertia and large delay system of body control, and it cannot achieve a good balance between no overshoot and fast braking.

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