A Control and Fault Diagnosis Method for Pressure Sensor Based Brake Control System 2005-01-1576

This paper proposes a control and fault diagnosis method for a pressure sensor based brake control system. The proposed wheel brake pressure control method consists of feedforward and feedback controller, respectively. The main purpose of the feedforward controller is to set the operating point of the feedback control, and the purpose of feedback controller is to improve the control response and the steady state error characteristic. Also, the proposed fault diagnosis method consists of three processes: a fault detection process, a fault isolation process and a fault identification process. In the fault detection process, a fault is detected by the difference between the estimated signal and the measured signal. Then, in the fault isolation process, the location of the fault is determined. Finally, in the identification process, the size and effect of the fault are evaluated. After the fault diagnosis, in the case of a recoverable fault, the system is maintained by system reconfiguration. However, in the case of unrecoverable fault, warning of the loss of the system function should be given. In this paper, this concept has been applied to EHB(Electro-Hydraulic Brake) system and actual vehicle test are performed to prove the feasibility of the proposed concepts.