Research on Brake Comfort Based on Brake-by-Wire System Control 2022-01-0912
The vehicle will produce certain shock and vibration during the braking process, which will affect the driving experience of the driver. Aiming at the problems of pitch vibration, longitudinal vibration and shock during the braking process, this paper proposes a planning and following control method for target longitudinal acceleration in post-braking phase, and designs control trigger strategies. Target longitudinal acceleration planning takes minimizing longitudinal shock as the design goal. The following control takes the brake pressure as the control object, and adopts the “feedforward +PID feedback” method to follow the target longitudinal acceleration. Besides, considering the safety of braking process, the trigger condition of control is designed which utilizes BP neural network method to judge whether the control has to be triggered. Based on Simulink software, the simulation model of straight-line braking is established. The results of straight-line braking simulation show that the proposed longitudinal acceleration planning and following control method can effectively reduce the pitch vibration amplitude, longitudinal vibration amplitude and longitudinal shock of the vehicle body. Also, the straight-line braking test of the vehicle was carried out, the test result shows that, based on meeting the braking safety requirements, the longitudinal acceleration planning and following control method can effectively improve the problem of pitch vibration, longitudinal vibration and shock.