Handling Stability Simulation of Three-axle Vehicle with Multi-axle Steering

Because the three-axle heavy-vehicle with front-wheel-steering has the big radius at low speed and bad stability at high speed,the multi-axle steering technology of three-axle vehicle is analyzed.The 2DOF model and differential equation of three-axle vehicle with all-wheel steering are established.Based on zero side-slip angle of mass center and proportional control strategy,the steering angle ratios of wheel,state condition matrix,transfer functions are obtained.Using MATLAB software,the handling stability of the three-axle vehicle with different steering models are simulated and compared in the domains of time and frequency.The result shows that multi-axle steering can decrease the steering radius at low speed and improve vehicle stability at high speed,and three-axle vehicle with all-wheel steering has the best handling stability.