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International Journal of Automotive Technology > Volume 9(6); 2008 > Article
International Journal of Automotive Technology 2008;9(6): 695-702.
DEVELOPMENT OF AN ACTIVE FRONT STEERING (AFS) SYSTEM WITH QFT CONTROL
J.-Y. ZHANG1, J.-W. KIM2, K.-B. LEE3, Y.-B. KIM2
1Changanvisteon Co.
2Chonnam National University
3Hanyeong Collage
ABSTRACT
This paper investigates an active front steering control strategy based on quantitative feedback theory (QFT). By incorporating feedback from a yaw rate sensor into the active steering system, the control system improves the dynamic response of the vehicle. The steering response of a vehicle generally depends upon uncertain quantities like mass, velocity, and road conditions. Thus, QFT is used to design a controller with robust performance. A multi-degree-of-freedom nonlinear model is co-simulated here by MATLAB Simulink and ADAMS/CAR. The performance of the control system is evaluated under various emergency maneuvers and road conditions. The result shows that the designed robust control system has good control performance and can efficiently improve handing qualities and stability characteristics.
Key Words: Quantitative feedback theory, Active front steering, Adams simulation
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