Electric power steering system and method

Abstract

The invention relates to the technical field of automobile steering, in particular to an electric power steering system and method. The electric power steering system comprises a wheel assembly, a steering mechanism mechanically connected with the wheel assembly, a steering controller, an ignition lock and an angle sensor, wherein the ignition lock and the angle sensor are electrically connected with the steering controller, the steering controller is electrically connected with the steering mechanism, and the angle sensor is mounted in the steering mechanism and used for collecting the current steering angle value of a steering wheel; the steering controller can obtain the current steering angle value of the steering wheel and the gear of the ignition lock in real time; and when the gear of the ignition lock is switched to the OFF gear from the ON gear and the current steering angle value of the steering wheel is larger than a set angle value, the steering controller controls the steering mechanism to rotate according to a steering angular speed function till the steering angle value of the steering wheel is smaller than the set angle value. By means of the electric power steering system and method, wheels automatically return after an automobile is stopped and parked, and thus the service life of the automobile is prolonged.

Description

technical field [0001] The invention relates to the technical field of automobile steering, in particular to an electric power steering system and method. Background technique [0002] At present, automobile products have entered thousands of households and become people's daily necessities. There are more and more new drivers on the road every year. For novices, due to unskilled skills, they are often in a hurry during the parking process. After parking, they often forget to return the wheels to the neutral position, and the driver loosens his hands After the steering wheel is turned on and the vehicle is turned off, the wheels are always in a deflection state. At this time, the gravity generated by the kingpin of the suspension of the vehicle and the righting moment generated by the inclination of the kingpin act on the tires, and the existence of friction between the tires and the ground makes the wheels It cannot move to the neutral position by itself and release the fo...

AI Technical Summary

Problems solved by technology

There are more and more new drivers on the road every year. For novices, due to unskilled skills, they are often in a hurry during the parking process. After parking, they often forget to return the wheels to the neutral position, and the driver loosens his hands After the steering wheel is turned on and the vehicle is turned off, the wheels are always in a deflection state. At this time, the gravity generated by the kingpin of the suspension of the vehicle and the righting moment generated by the inclination of the kingpin act on the tires, and the existence of friction between the tires and the ground makes the wheels Unable to move to the neutral position by itself to release the force of related components

In this way, a large number of parts of the vehicle chassis such as swing arms, steering knuckles, hub units, shock absorbers, steering rods, steering gear racks, etc. are under stress during the period of time when the vehicle is parked, and the stress cannot be released. The rubber bushing of the swing arm is in a state of compression and deformation for a long time, which may cause early failure of chassis suspension components and steering components such as cracking of the swing arm bushing and loosening of the steering rod ball, thereby reducing the service life of the vehicle

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