Patent ID: 6885922
Filing Date: 2005-04-26
Classification: B62D

Abstract:
1. A method of model-based fault detection for a vehicle steer-by-wire system, the method comprising: providing a steer-by-wire controlled plant with electric motor actuators, sensors, and other electrical and mechanical components and assembly providing a steer-by-wire controller for the steer-by-wire controlled plant to implement a steer-by-wire closed-loop system control; providing a steer-by-wire fault detection unit in electrical communication with steer-by-wire controlled plant and the steer-by-wire controller to detect faults of the steer-by-wire controlled plant; receiving input and output signals from the steer-by-wire controlled plant and vehicle signals from the vehicle; providing a residual generator in the steer-by-wire fault detection unit based on a mathematical model of steer-by-wire controlled plant without any fault in the controlled plant to implement an estimation for input signals, output signals, and states of the steer-by-wire controlled plant; generating a series of residual signals from a residual generator representing the difference between the received measurement signals from the steer-by-wire controlled plant and the estimated signals from residual generator; providing a decision-making unit in the steer-by-wire fault detection unit based on the received residual signals from the residual generator and fault test rules; and generating a fault decision signal to determine the fault occurrence in sensors, actuators, and the steer-by-wire controlled plant with other electro-mechanical components.