Enhanced Variable Universe Fuzzy Control of Vehicle Active Suspension Based on Adaptive Contracting-Expanding Factors

Aiming at the problems of difficulty in determining the contracting-expanding factor parameters, inability to realize adaptive adjustment of the fuzzy universe, and serious time delay of the system in the traditional variable universe fuzzy control of vehicles, an improved variable universe fuzzy control strategy with real-time adjustment of the contracting-expanding factor parameters is proposed to improve the ride comfort of vehicles. Combining the respective advantages of functional and fuzzy contracting-expanding factors, an adaptive contracting-expanding factor controller is designed according to the system error e(t) and its change rate ec(t) to realize the adaptive adjustment of the system universe, which effectively solves the problem of poor control effect caused by the contracting-expanding factor parameters cannot be adjusted adaptively according to the system feedback information in the traditional variable universe fuzzy control. The effectiveness and adaptability of the proposed algorithm are verified by simulation analysis and scale experiments based on the similarity theory under multiple working conditions. The research results show that the proposed enhanced variable universe fuzzy control based on adaptive contracting-expanding factors has strong adaptability and can effectively improve the ride comfort and handling stability of vehicles under different vehicle speeds and road excitations, which also can provide a certain technical basis for the development of the vehicle active suspension systems.