Abstract
Keywords:
Vehicle Dynamics, Steer-by-Wire, Handling and Stability, Four-Wheel-Steering, Driver Model
Abstract
This paper describes the design approach of steer-by-wire system based on vehicle dynamics control theory for enhancing handling performance and active safety of vehicle. The front tire steering angle is actively controlled with the application of yaw rate model matching control theory by using linear inverse dynamics for enhancing handling performance. The desired yaw rate is set to be the yaw rate of zero-sideslip four-wheel-steering vehicle for improving vehicle responsiveness. Thus, the steering gear ratio of SBW is varied based on vehicle dynamics control theory. Moreover, the driver’s time delay in steering operation is also compensated with derivative steering which is to driver’s individual characteristics. The effectiveness of steer-by-wire was verified by using the micro-size electric vehicle and the passenger car equipped with steer-by-wire system.