关键词: 汽车；磁流变阻尼器；分级控制；模糊自适应控制；协调控制；道路试验

Abstract:

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Based on necessary analysis and simplification on suspension vibration system, a hierarchical intelligent control system was proposed. In the control level, a local fuzzy adaptive(FA) controller was designed for each magneto-rheological(MR) independent suspension system, which can online adjust quantization factor and scale factor of fuzzy controller by human-like intelligent parameter modifying algorithm. In the coordination level, a coordination controller was designed to coordinate the four local independent FA controllers, by adjusting their output parameters according to system feedback in different conditions. Simulation tests were carried out in MATLAB. To validate the real results of hierarchical control, a MR suspension control and test system was set up and implemented on a mini bus. Road tests under various conditions were carried out. Compared to passive suspension, the hierarchical controller employed on MR suspension reduces the vibration acceleration of body floor about 15% and that of seat about 23%. The results indicate that the hierarchical controller can effectively reduce MR suspension vertical vibration, minimize the effect of simplified suspension system and damper model, and improve ride comfort.

Key words: automobile；magneto-rheological damper； hierarchical control；fuzzy adaptive control；coordination control, road test