ALGORITHM OF FEATURE RECOGNITION OF ROAD ROUGHNESS FOR ANIT-LOCK BRAKE SYSTEM

KONG Lei SONG Jian YAN Yiquan SHEN Jun

(State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084)

Abstract: For improving the control effect of anti-lock brake system(ABS) on roughness road, the signal characteristic in this instance and the algorithm of recognizing the degree of roughness road for ABS are studied. Modeling and simulation are used to prove that recognizing the roughness degree from wheel acceleration signal is viable. Based on the time-frequency domain analysis, “energy specific weight method” and “account the times crossing method” are studied to identify road. Then a real-time algorithm for road roughness feature recognition is designed, which depends on multilevel cross threshold, roughness counter, and so on. Otherwise the compensation algorithm for ABS on roughness road is studied primarily. Experimental results show that this algorithm can recognize roughness degree exactly and rapidly, and can meet the demands for the real-time control of ABS well.

Key words: Anti-lock brake system(ABS)  Road roughness  Feature recognition

CLC No: TU463. 54

Received 20061206, received in revised form 20070712