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

doi:10.3901/JME.2022.22.294

Abstract

Abstract: 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.

Key words: integrated electro-hydraulic brake system, pressure-position relationship, equivalent volume elastic modulus, simplified model of the brake circuit

CLC Number:

U461

YU Zhuo-ping, SHI Biao-fei, ZHUO Gui-rong, XIONG Lu, SHU Qiang. Theoretical Research on Pressure-position Relationship of the Integrated Electronic-hydraulic Brake System[J]. Journal of Mechanical Engineering, 2022, 58(22): 294-303.

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