Analysis of commercial vehicle electronically controlled pneumatic steering brake comfort based on brake pressure change rate

DU Shi-yuan, YANG Fan, LI Gang-yan
(School of Mechanical and Electrical Engineering, Wuhan University of Technology, Wuhan 430070, China)

Abstract: Aiming at the problem that the electronically controlled pneumatic brake pressure change rate of commercial vehiclesis easy to cause longitudinal impact, the relationship between the brake pressure change rate and the vehicle's brake comfort was studied.The eight-degree-freedom vehicle dynamics mathematical model of commercial vehicles was established, and the functional relationship between Jerk of commercial vehicles and brake pressure change rate was inferred. The simulation model of the commercial vehicle was established by MATLAB/Simulink software, under the steering brake condition, the changes of Jerk under different brake pressure change rate and front wheel steering angle were simulated, and the influence curve of the brake pressure change rate and the front wheel steering angle on the brake comfort of commercial vehicles was obtained.Meanwhile, according to the simulation result, the critical curve of the front wheel steering angle and brake pressure change rate was obtained.The results indicate that the proposed model can reflect the riding state of the commercial vehicle well. The brake pressure change rate during steering brake is similar to the change trend of the Jerk,which can provide a model reference for the evaluation of the electronically controlled pneumatic steering brake comfort of commercial vehicles.Besides, below the critical curve of the front wheel steering angle and brake pressure change rate, the vehicle's steering brake is comfort.
Key words: brake pressure change rate; Jerk; steering brake; braking comfort