Vehicle speed control method for wheel hub motor-driven vehicle

Abstract

The invention relates to a vehicle speed control method for a wheel hub motor-driven vehicle, and belongs to the technical field of automobiles. An input end is arranged in a finished automobile controller and is connected with a position sensor of a vehicle accelerator pedal via signals, is connected with a wheel speed sensor via signals, or is replaced with a motor rotating speed signal which is fed back by a motor controller; and a vehicle speed control module is arranged inside the finished automobile controller. The module calculates an actual vehicle speed by using the speed of four wheels, then calculates the difference value between the actual vehicle speed and the target vehicle speed, and inputs the difference value into a PID controller; the PID controller outputs target torque of a drive motor, thus, the output torque and the rotating speed of the motor are controlled by the accelerator pedal, and the drive motor is controlled in a power control manner. The finished automobile controller also estimates the road resistance when the vehicle moves at a constant speed according to the finished automobile parameter, so as to ensure that the vehicle runs at the constant speed when reaching the target vehicle speed. According to the method, the electronic differential function of the wheel hub motor-driven vehicle is achieved in a relatively simple manner.

Description

technical field [0001] The invention belongs to the technical field of automobiles, and in particular relates to a vehicle speed control method for an electric vehicle driven by a wheel hub motor that affects the electronic differential control of the vehicle. Background technique [0002] Electric vehicles, including hybrid vehicles, fuel cell vehicles, and pure electric vehicles, have the characteristics of energy saving and environmental protection, and are the development direction of the new generation of automobile technology. The electric vehicles currently being developed are generally formed by modifying the power transmission system in the traditional automobile chassis. For example, a hybrid vehicle is driven by adding a drive motor to the drive train and realizing power synthesis with the help of a power synthesizer. The fuel cell vehicle is the electric energy output by the fuel cell and the electric energy of the auxiliary energy to provide power for the drive...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the accelerator pedal is directly related to the motor drive torque, requiring the driver to continuously adjust the accelerator pedal to control the motor drive torque, while traditional internal combustion engine vehicles use the accelerator pedal to control the fuel injection of the engine, which actually controls the engine output power. The engine speed and torque can be automatically adjusted without the driver intervening too much in the actual output torque of the engine

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