Active return controL method and system for eLectric power steering system

Abstract

The invention provides an active return controL method for an eLectric power steering system. The method incLudes the steps of coLLecting the steering wheeL angLe, the vehicLe speed and the driver's hand strength; adopting a first preset preprocessing method to preprocess the coLLected vehicLe speed and driver's hand strength and adopting a second preset preprocessing method to preprocess the coLLected steering wheeL angLe to obtain the actuaL speed of the current steering wheeL; based on the preprocessed steering wheeL angLe and vehicLe speed, determining the steering wheeL target return speed required under the current steering wheeL angLe; based on the obtained actuaL speed of the steering wheeL and the steering wheeL target return speed, determining the return current target vaLue; based on the return current target vaLue and the preprocessed driver's hand strength, determining the finaL return target current; if the preprocessed vehicLe speed is Larger than a preset vehicLe speedthreshoLd, outputting corresponding return moment based on the finaL return target current. The active return controL method for the eLectric power steering system makes a vehicLe high in stabiLity and comfortabLe.

Description

technical field [0001] The invention relates to the technical field of automotive electronic control, in particular to an active return control method and system for an electric power steering system. Background technique [0002] The electric power steering system is a power steering system that directly relies on the motor to provide auxiliary torque. It is generally composed of a torque sensor, a rotation angle sensor, a vehicle speed sensor, a power assist motor, a reduction mechanism and an electronic control unit. The working principle of the electric power steering system is that the electronic control unit obtains the driver's hand signal through the torque sensor, obtains the steering wheel angle signal through the angle sensor, and combines the vehicle speed and other information to determine the direction of rotation of the power assist and the magnitude of the power assist current, thereby completing real-time control. power steering. Therefore, it can easily pr...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the examples of the present invention is to solve the problem of hand force fluctuations caused by the inaccurate judgment of the centering state and the switching of the centering function and the power assist function when the electric power steering system with the steering wheel angle signal is actively returning to the centering control. To provide a reliable active centering control method and system for an electric power steering system that does not depend on the judgment of the centering state and can make the steering wheel return to the centering reasonably

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