The Mechanical Sytem And Control System Co-Simulation Research Of 4WS Virtual Prototype

Four-wheel-steering (4WS) as an advanced technology of active chassis control, which approaches to improving vehicle handling and stability, especially in the medium and high speed.First, work principle and merit of 4WS system are summarized, and control strategies and development trends of 4WS system are described. From the simulation point of view, shortages of what has been studied on 4WS and the importance of co-simulation are pointed out. In order to create 4WS model, the design procedures of digital model based on virtual prototype technology are studied. This study reviews the methods utilized in ADAMS, including coordinate choice, the system equation constructions and solutions.In addition, transfer function equation is deduced by setting yaw-rate and side-slip-angle as performance indexes, the 4WS vehicle control tactics (Multi-variable stabilization control for four-wheel-steering vehicle based on yaw-rate tracking) is presented to improve the vehicle dynamic characteristics in high-speed range.