Method for controlling speed of electric car

Abstract

The invention relates to a method for controlling the speed of an electric car. The method comprises the following steps: (1) inputting an actual speed signal detected by a Hall type wheel speed signal sensor into a completed car controller, and judging whether to start the speed closed-loop control or not through a control chip; (2) selecting a driving mode on a driving mode selecting module by a driver according to a present road condition, and at the same time, stepping an electronic type accelerator pedal to one position for the driver; (3) inputting a driving mode signal, an accelerator pedal position signal and the actual speed signal into the completed car controller through corresponding channels; (4) filtering the input accelerator pedal position signal by using a low pass filter; (5) calculating the processed accelerator pedal position signal and the processed actual speed signal through a PID controller to obtain a drive motor torque command, and inputting the drive motor torque command to a drive motor controller through a CAN communication channel; and (6) controlling a drive motor to act by the drive motor controller according to the drive motor command. The method disclosed by the invention can be widely applied to the speed control of various electric cars.

Description

technical field [0001] The invention relates to a vehicle speed control method, in particular to a vehicle speed control method of an electric vehicle in which the position of the accelerator pedal corresponds to the vehicle speed of the electric vehicle. Background technique [0002] As of the end of 2013, the number of automobiles in China has exceeded 130 million, and there are 31 cities in the country with more than 1 million automobiles, including Beijing, Tianjin, Chengdu, Shenzhen, Shanghai, Guangzhou, Suzhou, and Hangzhou. The inventory exceeds 2 million vehicles. At present, the vast majority of cars in the Chinese market and on the market still use traditional internal combustion engines as power, which brings huge pressure on energy conservation and environmental protection. Compared with internal combustion engine vehicles, electric vehicles have many advantages, such as high energy conversion efficiency and large torque at low speeds. With the continuous tight...

AI Technical Summary

Problems solved by technology

However, under the traditional vehicle speed control method, the electric vehicle may produce excessive acceleration and deceleration, which will cause the motor to not work in the optimal efficiency zone, and also lose part of the braking energy.

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