|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."
Active suspension, augmented system equation, LQG controller, roll safety, vehicle engineering.