Electric power steering system

Abstract

The invention relates the technical field of vehicle power steering, in particular to an electric power steering system. The electric power steering system comprises a vehicle velocity sensor, a torque sensor, a rotation angle sensor, an ignition signal generator, a lateral acceleration sensor and a yaw velocity sensor, wherein the vehicle velocity sensor is used for collecting a vehicle velocity signal; the torque sensor is used for collecting a torque signal of a steering wheel; the rotation angle sensor is used for collecting a rotation angle signal and a rotation speed signal of the steering wheel; the ignition signal generator is used for collecting an ignition signal; the lateral acceleration sensor is used for collecting a lateral acceleration signal; the yaw velocity sensor is used for collecting a vehicle yaw velocity signal; an ECU (Electronic Control Unit) receives signals, processes the signals and outputs a current signal to a motor; and a power torque generated by the motor is added to a hand torque, acting upon the steering wheel, of a driver after being increased and the wheel is driven by a mechanical steering system to steer and return. Through collecting the lateral acceleration signal and the vehicle yaw velocity signal, the active returning function of the vehicle at high and low velocities is improved; therefore, the safety and comfort of the vehicle are improved, the operation stability and safety of the vehicle under extreme working conditions of road surfaces with small slip friction coefficients, large-angle sudden turning and the like are enhanced.

Description

technical field [0001] The invention relates to the technical field of vehicle power steering, in particular to an electric power steering system. Background technique [0002] The Electric Power Steering System (EPS for short) tends to be developed as a standard configuration in the field of passenger vehicles at present. EPS can improve the contradiction between the portability of the steering system and the road feel, and significantly improve the safety, operation stability and comfort of the vehicle. However, due to the influence of motor inertia, friction, and damping, the return performance of EPS is slightly poor, and it is prone to insufficient return at low speeds and excessive return at high speeds: when driving at low speeds or turning in situ due to friction in the steering system And the existence of damping, as well as the damping effect of tires, the righting torque cannot overcome the frictional resistance of the road surface and the system, so that the ste...

AI Technical Summary

Problems solved by technology

But there is a problem: the steering wheel torque signal and the rotation angle signal are the detection of the driver's driving behavior. The EPS lacks the detection of the actual driving characteristic parameters of the vehicle, and the lack of feedback of the actual driving characteristic parameters of the vehicle to the EPS system, which is convenient for the EPS system. Comprehensive decision-making control to output power-assist torque that is more suitable for the actual needs of the vehicle

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