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Sliding Mode Observer and Long Range Prediction Based Fault Tolerant Control of a Steer-by-Wire Equipped Vehicle
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 14, 2008 by SAE International in United States
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This paper presents a nonlinear observer and long range prediction based analytical redundancy for a Steer-By-Wire (SBW) system. A Sliding Mode Observer was designed to estimate the vehicle steering angle by using the combined linear vehicle model, SBW system, and the yaw rate. The estimated steering angle along with the current input was used to predict the steering angle at various prediction horizons via a long range prediction method. This analytical redundancy methodology was utilized to reduce the total number of redundant road-wheel angle (RWA) sensors, while maintaining a high level of reliability. The Fault Detection, Isolation and Accommodation (FDIA) algorithm was developed using a majority voting scheme, which was then used to detect faulty sensor(s) in order to maintain safe drivability. The proposed observer-prediction based FDIA algorithms as well as the linearized vehicle model were modeled in MATLAB-SIMULINK. Three different fault types were used to evaluate the effectiveness of the proposed algorithms: transient, persistent, and incipient faults. Simulation results show that the faulty sensor detection time decreases with the increase of prediction horizon illustrating advantages of the predictive analytical redundancy based algorithms against single point failures for all fault types.
CitationHasan, M. and Anwar, S., "Sliding Mode Observer and Long Range Prediction Based Fault Tolerant Control of a Steer-by-Wire Equipped Vehicle," SAE Technical Paper 2008-01-0903, 2008, https://doi.org/10.4271/2008-01-0903.
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