This paper aims to optimize the conflicting performance indicators of ride comfort and suspension dynamic displacement by introducing a balance control strategy for active suspension. An unknown nonlinear estimator (UNE) based on a low-pass filter is devised to accurately estimate the unknown nonlinear forces generated by springs and tires. In the designed control strategy, balance controller adjusts the ride comfort when the suspension dynamic displacement is lower than the set threshold, and adjusts the suspension dynamic displacement when it is higher. The boundedness of all variables in a closed-loop system is proved by Lyapunov functions. Simulation investigations and comparison results on different road surfaces are provided to show the satisfactory performance of the designed control method.
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