基于AMESim的防抱死制动系统控制研究

为了提高ABS制动模型的准确性,提出液压数值模拟的方法,并结合Simulink软件环境,建立车辆单车轮ABS动力学模型。采用PID控制和有限状态机相结合的控制方法,实现对ABS液压系统的制动控制。应用AMESim与Simulink对系统进行联合仿真,分析不同动力黏度的液压油对ABS的影响。结果表明,所采用的控制策略能使车轮滑移率稳定在最佳滑移率0.2附近,实现了对ABS的有效控制;随着液压油动力黏度由0.725 Pa·s增加到1.425 Pa·s,制动距离由24.28 m增加到25.51 m,说明油液黏度增加会使制动距离加长。因此,所建立的车辆单车轮ABS动力学模型比线性化制动模型更能体现参数的特性变化,研究方法可应用于ABS液压系统设计中的参数选择与匹配。

Study on the control of anti-lock brake system based on AMESim

In order to improve the accuracy of ABS braking model, a hydraulic numerical simulation method was proposed, and a single wheel ABS dynamic model was established by combining Simulink software. As for the control method, the combination of PID control and finite state machine method was used to realize the brake control of ABS hydraulic system. The influence of hydraulic oil with different dynamic viscosities on ABS was analyzed by AMESim and Simulink of simulation. The results show that the control strategy can stabilize the wheel slip ratio near the optimal slip ratio of 0.2, and realize the effective control of ABS. As the dynamic viscosity of hydraulic oil increases from 0.725 Pa·s to 1.425 Pa·s, the braking distance increases from 24.28 m to 25.51 m, which indicates that the braking distance will increase with the viscosity of hydraulic oil. It can be seen that the dynamic model of single wheel ABS can reflect the change of parameters better than the linear braking model. The method proposed in the paper can be applied to parameter selection and matching in ABS hydraulic system design.