Aligning control method and device for electric power-assisted steering device

Abstract

The invention discloses an aligning control method and an aligning control device for an electric power-assisted steering device. The method comprises the following steps: establishing a mathematicalmodel of the electric power-assisted steering device; testing the steering work under different road resistance through a bench test, tabling results, and storing a table in an electronic control unit; determining to enter an aligning control condition; estimating the driving road surface resistance torque of a vehicle; calculating the energy required to be provided by a power-assisting motor whenthe steering wheel of the vehicle is to be aligned according to the road surface resistance moment, and calculating to obtain the assistant aligning torque required to be provided by the power-assisting motor; finally, obtaining a vehicle speed related coefficient and a steering wheel related coefficient to modify the assistant aligning torque according to vehicle speed information and aligning torque information. According to the aligning control method and the aligning control device for the electric power-assisted steering device, the aligning performance of the electric power-assisted steering device is improved on the premise of not influencing the operating hand feel of a driver and not increasing the required sensors.

Description

technical field [0001] The invention relates to the technical field of designing an electric power steering system, and in particular relates to a method and device for returning to a centering control of an electric power steering system for a vehicle. Background technique [0002] The electric power steering system (EPS) of a vehicle usually consists of a torque sensor, a vehicle speed sensor, an electronic control unit (ECU), a booster motor, a worm gear reducer, and a rack and pinion steering gear. The working principle of the electric power steering system is to detect the steering wheel angle and the steering torque acting on the steering wheel through the angle sensor and torque sensor installed on the steering column. The control algorithm generates corresponding power-assist torque to assist the driver in turning the steering wheel. [0003] When a vehicle equipped with an electric power steering device is turned, the friction force increases due to the existence o...

AI Technical Summary

Problems solved by technology

[0003] When a vehicle equipped with an electric power steering device is turned, the friction force increases due to the existence of the power-assisted motor and the worm gear reducer, which reduces the steering wheel's return to alignment performance, which may easily cause insufficient alignment of the steering wheel at low speeds and high-speed driving. return overshoot

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