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A Novel LQG Controller of Active Suspension System for Vehicle Roll Safety

Shi-an Chen, Yu-meng Cai*, Jian Wang, and Ming Yao
International Journal of Control, Automation, and Systems, vol. 16, no. 5, pp.2203-2213, 2018

Abstract : "To improve vehicle roll safety during steering operation at high running speed, a new design approach for Linear Quadratic Gaussian (LQG) controller of active suspension system is proposed. Key steps of the new approach are as follows: 1) The front axle steered angle is written into a differential equation in accord with the minimum phase system and combines with the original system into the augmented system equation; 2) positive infinitesimals respectively including controls are added to the index; Thirdly, weights of the evaluating indicators of the LQG controller are determined by using analytic hierarchy process (AHP) and normalization methods based on vehicle motion statistics under the double-lane change maneuver as the typical steering maneuver. Performance comparisons are implemented between the active suspension system and the passive one under the double-lane change, slalom and fish-hook maneuvers. Results verify that the active suspension system with the proposed controller can achieve better vehicle roll safety and has a good adaptability under different steering maneuvers."

Keyword : Active suspension, augmented system equation, LQG controller, roll safety, vehicle engineering.

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