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基于模糊制动压力控制的电液制动系统研究
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吉林省职业教育与成人教育教学改革研究课题(2019ZCY156);教育部科技发展中心产学研创新基金(2018A05024);吉林省“十三五”科学技术项目(JJKH20190901KJ)


Research on Electrohydraulic Braking System Based on Fuzzy Brake Pressure Control
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    摘要:

    为实现对车辆制动系统的准确控制,设计一种基于模糊制动压力控制的电液制动系统。对电液制动系统的结构进行分析,明确其制动原理。对车辆进行建模,得到车轮纵向和横向受力的计算方法,建立车轮的动力学方程。通过扩展卡尔曼滤波器计算车辆制动压力控制时的相应参数,采用车辆的滑移角及滚动速度求取车轮的纵向和横向滑移系数。构造模糊推理系统的隶属函数,以车轮的滑移系数及附着系数作为依据,求取路面类型。根据路面类型,基于人工神经网络,得出参考滑移。利用参考滑移得到滑移误差和误差率;通过模糊控制隶属函数求出最佳控制压力,完成车辆制动控制。结果表明:在高附着系数路面及混合附着系数路面上,所提方法比模糊PID方法的制动时间分别缩短了10.66%和11.83%;在制动控制时,该方法的滑移率比模糊PID方法的滑移率波动幅度更小且更接近最佳滑移率,说明该方法能高效且稳定地实现车辆的制动控制。

    Abstract:

    In order to realize the accurate control of vehicle braking system, an electrohydraulic braking system based on fuzzy brake pressure control was designed. The electrohydraulic braking system structure was analyzed and its braking principle was clarified. The vehicle was modeled, the calculation methods of longitudinal and transverse forces on wheels were obtained, and the dynamic equations of wheels were established. The corresponding parameters of vehicle braking pressure control process were calculated by using extended Kalman filter, and the longitudinal and transverse slip coefficients of wheels were obtained by using the slip angle and rolling speed of the vehicle. The membership functions of fuzzy inference system were constructed, and the pavement type was obtained based on the slip coefficient and adhesion coefficient of wheel. According to the pavement type, the reference slip was obtained based on the artificial neural network. The reference slip was used to calculate the slip error and error rate; the optimal control pressure was obtained by using fuzzy control membership function to complete the vehicle braking control. The results show that the braking time of this method is 10.66% and 11.83% shorter than that of fuzzy PID method on high adhesion coefficient pavement and mixed adhesion coefficient pavement respectively; in braking control, the slip rate fluctuation amplitude of this method is smaller than that of fuzzy PID method, and it is more closer to the optimal slip rate, which shows that the braking control of vehicle can be realized efficiently and stably by using this method.

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韩伟,李虹.基于模糊制动压力控制的电液制动系统研究[J].机床与液压,2021,49(21):142-146.
HAN Wei, LI Hong. Research on Electrohydraulic Braking System Based on Fuzzy Brake Pressure Control[J]. Machine Tool & Hydraulics,2021,49(21):142-146

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  • 在线发布日期: 2023-04-07
  • 出版日期: 2021-11-15