汽车线控液压制动系统轮缸液压力估计算法研究  

Research on Estimation Algorithm of Hydraulic Pressure in HCU Wheel Cylinder of Automotive Electronic Hydraulic Braking System

作　　者：吴浩[1] 王维领 余裕 Wu Hao;Wang Weiling;Yu Yu(Chongqing Jiaotong University,Chongqing 400074)

机构地区：[1]重庆交通大学,重庆400074

出　　处：《汽车工程师》2024年第4期24-32,共9页Automotive Engineer

摘　　要：针对八阀结构的集成式线控液压制动系统液压控制单元(HCU)轮缸压力估计算法估计精度不足的问题,提出一种可替代压力传感器的轮缸液压力估计算法。首先基于伯努利原理提出了轮缸液压力估计算法,然后基于硬件在环台架测试分析液压调节单元的基本特性以及制动液的体积刚度(PV)特性,最后通过实车试验进行了验证。结果表明,所提出的轮缸压力估计算法在基础制动工况下的均方根误差在0.259 MPa以内,主动制动工况下均方根误差在0.374 MPa以内,与加装压力传感器的方案精度相当。To address the issue of insufficient estimation accuracy of the Hydraulic Control Unit(HCU)wheel cylinder pressure estimation algorithm for an integrated wire controlled hydraulic braking system with eight valve structure,this article proposed wheel cylinder hydraulic pressure estimation algorithm that can replace pressure sensors.The article first proposed a wheel cylinder hydraulic pressure estimation algorithm based on the Bernoulli principle,and then analyzed the basic characteristics of the hydraulic adjustment unit and the Pressure Volume(PV)characteristics of the brake fluid based on hardware in the loop experimental bench testing.Finally,it was verified through actual vehicle experiments.The experimental results show that under basic braking conditions,the root mean square error of the proposed wheel cylinder pressure estimation algorithm is within 0.259 MPa,the root mean square error under active braking conditions is within 0.374 MPa,which is equivalent to the accuracy of the scheme with added pressure sensors.

关 键 词：线控液压制动系统 轮缸压力估计 轮缸体积刚度特性 伯努利原理 

分 类 号：U463.6[机械工程—车辆工程] TP391.41[交通运输工程—载运工具运用工程]