Control device for vehicle power steering

Abstract

A novel control device for a vehicle power steering apparatus or system is improved for providing preferable steering convergnecy even under the execution of VSC, while ensuring the steering smoothness under normal running conditions. In the control device, the target value of total modification torque to be added to steering torque through an power steering apparatus, is calculated based upon steering assist torque, calculated based upon at least steering torque; steering converging torque, based upon a steering velocity; and behavioral deterioration-suppressing torque for suppressing unwanted steering motions which would cause further deterioration of a vehicle behavior under oversteered or understeered conditions. In this calculation, when a predetermined condition is satisfied, the degree of contribution of the target value of the behavioral deterioration-suppressing torque to the target value of the total modification torque is rendered higher than the degree of contribution of the target value of the steering converging torque to the target value of the total modification torque.

Description

technical field [0001] The present invention relates to a control device for controlling a power steering device mounted on a vehicle (for example, an automobile), and more particularly, to a control device for controlling torque and / or force generated by a power steering device for assisting a driver Steering operation and stable vehicle characteristics. Background technique [0002] In a modern power steering system equipped on a vehicle, the moment / force acting on the steering wheel for assisting the driver's steering operation is controlled based on parameters of the vehicle operating conditions, such as vehicle speed. So far, in addition to the function of reducing the torque (steering torque) required to turn the steering wheel, the power steering system and its control device have been designed in many forms to provide the driver with comfort and safety in the process of driving the vehicle. sex. [0003] In some power steering systems, the torque controlled to incr...

AI Technical Summary

Problems solved by technology

[0007] According to the present invention, there is provided a novel control device for a vehicle power steering device or system, the improved control device can provide more ideal steering convergence regardless of whether the characteristics of the vehicle are deteriorated or whether the vehicle is equipped with VSC characteristics while ensuring smooth steering under normal driving conditions (without deterioration of vehicle characteristics)