An Advanced Vehicle Control Method using Independent Four-Wheel-Steering System

Abstract

This paper describes an advanced vehicle control method using independent four wheel steering system for vehicle handling and stability. At accelerating and at braking on a vehicle cornering, each tire force coefficient of the vehicle is quite different because of load transfer and non-linear characteristics of tire forces. Therefore, 4WS system is not effective for the vehicle control and stability at high lateral acceleration condition. If the tire force coefficient are controlled, it is possible that the vehicle has been more stable at high lateral acceleration cornering evan at critical situation. For the control, there are two kinds of method to control the tire force coefficient, one is direct yaw moment control method with traction and braking force and the other is with independent four wheel steering system. This paper shows the effect of the independent 4WS to the vehicle behavior. © 1998, The Japan Society of Mechanical Engineers. All rights reserved.