Speed limiting control method and system of new energy vehicle

Abstract

The invention discloses a speed limiting control method of a new energy vehicle. The method comprises the following steps: the motor rotating speed and the rotating speed change rate of the vehicle are obtained; when the motor rotating speed and the rotating speed change rate at the first moment meet first torque reduction trigger rules, values of corresponding torque reduction coefficients are determined, and the vehicle is controlled to enter a torque reduction state; the actual torque at the present time is determined according to the vehicle gear at the present time, the torque change steplength calculated by the torque reduction coefficients and the actual torque at the previous moment, and the absolute value of the actual torque at the present time is lower than the absolute value of the actual torque at the previous moment; and when the difference value between the target speed limiting point at the second moment and the motor rotating speed is higher than the preset first threshold, the vehicle is controlled to enter the defaulted state, and the actual torque is equal to the target torque analyzed by an acceleration pedal. The method can conveniently control the speed limiting. The invention further discloses a speed limiting control system of the new energy vehicle, and achieves corresponding effects.

Description

technical field [0001] The invention relates to the technical field of new energy vehicles, in particular to a speed limit control method and system for new energy vehicles. Background technique [0002] With the vigorous advocacy of new energy vehicles by the country and society, new energy vehicles have achieved continuous development and have been more and more widely used. [0003] New energy vehicles, especially pure electric vehicles, need to control the motor speed of the vehicle within a certain range due to the performance requirements of their motors and motor controllers. In the prior art, for the control of the motor speed of the new energy vehicle, the PID adjustment algorithm is generally used to realize it through the motor controller or the vehicle controller. Although the PID algorithm can obtain better accuracy, the coefficient setting of the PID algorithm for a specific vehicle needs to be obtained through experimental data, which is time-consuming and la...

AI Technical Summary

Problems solved by technology

Although the PID algorithm can obtain better accuracy, the coefficient setting of the PID algorithm for a specific vehicle needs to be obtained through experimental data, which is time-consuming and laborious.

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