摘要
基于传统逻辑门限值的汽车ABS一般不存在直接的轮缸液压力控制,而是基于滑移率和轮速反馈设计电磁阀的状态和参数,实现轮缸增压和减压控制,因此精度较低。为了提高控制精度,开发了一种轮缸压力控制算法,通过减压阀PWM占空比控制和阀体打开时机的同步调节,实现更精细、准确的减压控制;基于增压阀流量以及动态模型,利用增压阀的比例溢流特性,实现消除累积误差的轮缸液压力估计和控制算法。最后通过AMESim与MATLAB/Simulink联合仿真及搭建台架测试,增压控制逻辑实现了增压控制精度在3 bar以内、减压控制逻辑实现减压控制精度在2 bar以内,相比传统逻辑门限制控制精度提高了9.8%,验证了控制算法的有效性和准确性。
There is generally no direct wheel cylinder hydraulic pressure control for automotive ABS based on traditional logic threshold values.A variety of states and parameters of the solenoid valve were designed based on the feedback of slip rate and wheel speed.According to the feedback,the logic judgment was made to realize the pressurization and decompression control of vehicle wheel cylinders at different times and speeds,so the control accuracy was low.Through the PWM duty cycle control of the pressure reducing valve and the simultaneous adjustment of the opening time of the valve body,a more precise and accurate pressure reducing control was achieved.Based on the flow rate and dynamic model of the booster valve,using the proportional overflow characteristics of the booster valve,the estimation and control algorithm of wheel cylinder hydraulic pressure to eliminate the cumulative error was realized.Finally,through the joint simulation of AMESim and MATLAB/Simulink and the bench test,the effectiveness and accuracy of the control algorithm were verified.The pressurization control accuracy within 3 bar was realized through pressurization control logic;The decompression control precision was less than 2 bar through the decompression control logic,which was 9.8%higher than the traditional logic gate limit control precision.
作者
陈贺军
黄波
李亚轮
舒强
刘洋
CHEN Hejun;HUANG Bo;LI Yalun;SHU Qiang;LIU Yang(College of Mechanical and Automotive Engineering,Shanghai University of Engineering Science,Shanghai 201620,China;Shanghai Tongyu Automobile Technology Co.,Ltd.,Shanghai 201806,China)
出处
《农业装备与车辆工程》
2023年第10期12-17,共6页
Agricultural Equipment & Vehicle Engineering
基金
国家重点研发计划(2021YFA1500904)。
