Optimal Preview Control of Active Suspension System Augmented by Active Aerodynamic Surface Based on Quarter Car Model

초록

This paper presents an integrated optimal preview control strategy where an active suspension system (AAS) collaborates with an active aerodynamic control surface (AACS), utilizing the information of incoming road disturbance. The optimal preview controller utilizes a feedforward and feedback controller to anticipate future road disturbances while addressing the conflicting objectives of passenger comfort and road-holding attributes. The active aerodynamic surface generates a desired lift or downward force to change the sprung mass vertical load distribution, further improving the ultimate target indices. The preview-based optimal controller was synthesized by optimizing and tuning two sets of weighting factors, each based on passenger comfort and road-holding preferences. A numerical simulation study was performed for a 2-DOF quarter-of-vehicle (QoV) model in MATLAB (R) (R2025b). Detailed time- and frequency-domain analyses were performed to validate the performance of the proposed scheme. The mean squared values of the total performance measure, vertical sprung mass acceleration, suspension travel, and road-holding indices were calculated and compared with the passive, active, active suspension with preview controller, and active suspension with an active aerodynamic surface (AAS). From the numerical results, it can be concluded that the proposed control strategy extraordinarily improves both ride comfort and road-holding capabilities of the vehicle model while maintaining the suspension rattle space requirements within the bounds and ensuring the dynamic stability of the vehicle.

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