Research on Brake Comfort Based on Brake-by-Wire system Control
2022-01-1113
03/29/2022
- Event
- Content
- 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 and termination 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. Based on Carsim and Simulink software, the simulation model of straight-line braking is established. In this model, the control target is longitudinal acceleration and the control object is four-wheel braking pressure. 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. Besides, considering the safety of braking process, the control trigger and termination strategies are designed. Control trigger strategy utilizes BP neural network method to judge whether the control has to be triggered. The control termination strategy utilizes the logical threshold control method to judge whether the control has to be terminated. The straight-line braking test of the vehicle was carried out. The results show 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.
- Citation
- Xiong, W., Wang, W., Jiang, K., Hou, L. et al., "Research on Brake Comfort Based on Brake-by-Wire system Control," SAE Technical Paper 2022-01-1113, 2022, .