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A New SSUKF Observer for Sliding Mode Force Tracking H ∞ Control of Electrohydraulic Active Suspension
Author(s) -
Zhang Jie,
Ding Fei,
Zhang g,
Chen Shengzhao,
Zhang Bangji
Publication year - 2020
Publication title -
asian journal of control
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.769
H-Index - 53
eISSN - 1934-6093
pISSN - 1561-8625
DOI - 10.1002/asjc.1944
Subject(s) - control theory (sociology) , active suspension , actuator , observer (physics) , suspension (topology) , tracking (education) , sliding mode control , mode (computer interface) , controller (irrigation) , engineering , state observer , control engineering , control (management) , computer science , physics , mathematics , artificial intelligence , nonlinear system , psychology , pedagogy , agronomy , quantum mechanics , homotopy , pure mathematics , electrical engineering , biology , operating system
Compared to passive and semi‐active suspensions, active suspensions have the capacity to overcome the tradeoff design of vehicle ride comfort and handling performance. In this paper, a new control system with modified spherical simplex UKF (SSUKF) observer and sliding mode force tracker is proposed for electrohydraulic active suspensions. The estimated states obtained from the SSUKF observer are used to derive the mode energy of body motion and design the target demanded forces for suspension actuators. A sliding mode controller is presented to drive electrohydraulic actuators to track the demanded forces. Based on a robust H∞ control method, a new control strategy depending on body mode energy is proposed to restrict body motion. The performance comparisons between passive and active suspensions under three typical excitations are presented, and the obtained results indicate that the proposed control system can significantly depress body motion and decrease the mode energy to improve ride comfort and also effectively enhance the road hold abilities.