Abstract: The effects of steering velocity of front wheel on vehicle handling and stability are investigated. Based on dynamic analysis, a vehicle handling and stability model with three degrees of freedom is constructed and a model of tire side force considering steering velocity is presented, and a transfer function matrix between vehicle front wheel angle and lateral acceleration, yaw rate and body roll angle is deduced. Using transfer function matrix estimation method, some parameters of tire cornering properties correlated with angular acceleration and angular velocity of side slip angle are identified and calculated. The test validation for whole vehicle model and tire side force model are conducted. By virtue of these models, the effects of steering velocity on vehicle handling and stability are analyzed. The results show that steering velocities of front wheel within a certain range have remarkable impacts on vehicle lateral acceleration, yaw rate and body roll angle, and the impact degree is different from each other. In normal steering, the change of steering velocity has considerable influence on the dynamic characteristics of vehicle.

Key words: Handling and stability, Parameter identification, Side force of tire, Steering velocity