Hydraulic Model and Inverse Model for Electronic

Stability Program Online Control System

LI Liang¹  SONG Jian¹  HAN Zongqi²  KONG Lei¹

(1. State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084;
2. Department of Vehicle and Energy, Yanshan University, Qinhuangdao 066004)

Abstract: The simulation and test of the hydraulic system of electronic stability program (ESP) are analyzed and tested. The active pressure control model which includes the control valves, eccentric rotary plunger pump, brake pipe/hose, and throttles, is built. The active pressure system is simulated, and the dominant characteristics of the subsystems are obtained. Based on the dominant characteristics of the model and experimental data, the hydraulic model and inverse model are developed. The hydraulic model and inverse model can be used to the inline estimation with EPS and obtain the wheel brake pressure which is one of the most important parameters of the system. The simulation and experiment show that the hydraulic model and inverse model can satisfy the require of the EPS online control.

Key words: Electronic stability program(EPS)  Hydraulic control unit  Pressure prediction model

CLC No: U463

国家自然科学基金资助项目(50575120). Received 20070325, received in revised form 20070912