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System and method of robust fault detection for a vehicle steer-by-wire system

  • US 6,885,922 B2
  • Filed: 06/24/2003
  • Issued: 04/26/2005
  • Est. Priority Date: 06/24/2003
  • Status: Expired due to Term
First Claim
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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.

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