集成式电子液压制动系统位移压力特性理论研究

集成式电子液压制动系统（Integrated electro-hydraulicbrakesystem,IEHB）的位移压力特性对于现有的IEHB主缸压力控制算法及未来可期的主缸压力估计算法均至关重要，现有研究多以实测和曲线拟合为主，缺乏理论依据。为此，从含气制动液等效体积弹性模量和制动回路变形特性分析入手，首先基于合理假设，提出制动回路简化模型；之后通过由制动回路变形表示的等效体积弹性模量与制动液自身的等效体积弹性模量相等，推导出主缸活塞位移与压力的函数关系，即位移压力模型；最后通过台架试验对位移压力模型进行参数辨识和模型验证，结果表明，在0～10MPa的压力范围内，所提出的位移压力模型与试验数据的误差最大不超过0.255MPa。

Theoretical Research on Pressure-position Relationship of the Integrated Electronic-hydraulic Brake System

The pressure-position relationship of the integrated electro-hydraulic brake system（IEHB） is very important for the existing master cylinder pressure control algorithm and the future master cylinder pressure estimation algorithm of IEHB. Existing studies are mainly based on experiment and curve fitting, thus lack theoretical analysis. To this end, starting with the analysis of the equivalent volume elastic modulus of the air-containing brake fluid and the deformation characteristics of the brake circuit, a simplified model of the brake circuit is proposed firstly based on reasonable assumptions; then let the equivalent volume elastic modulus represented by the deformation of the brake circuit be equal to that of the brake fluid itself, and the functional relationship between the displacement of the master cylinder piston and the pressure is derived（i.e. pressure-position model）. Finally, parameter identification and model verification are carried out through bench test. The results show that in the pressure range of 0-10 MPa, the error between the proposed pressure-position model and the test data does not exceed 0.255 MPa at most.