Analysis of Performance of Vehicle with Multi-axle Steering at Different Steering Modes

Because heavy-duty vehicle with front-wheel steering has the big radius at low speed and bad stability at high speed,in order to improve heavy-duty vehicle steering performance at different speeds,the multi-axle steering technology was put forward.Taking the three-axle vehicle with multi-axle steering as the research object,the 2-DOF model and differential equation of vehicle with multi-axle steering were established.Based on zero side-slip angle of mass center and proportional control strategy,the steering angle ratios of wheel,state condition matrix,and transfer functions were obtained.Using MATLAB software,the handling stability of the three-axle vehicle with different steering models were simulated and compared,including stable response,transient response and frequency response.The result shows that multi-axle steering technology can decrease the steering radius at low speeds and improve vehicle stability at high speeds.