The controller of magnetorheological semi - active suspension system was consisted of drive current control subsystem of magnetorheological damper and mechanical structural fuzzy control subsystem of vehicle , the unsymmetry damping force relation of suspension compress travel and promote travel is solved with coefficient of language - value of damper force output variable 由汽车结构振动模糊控制子系统和磁流变阻尼器驱动电流控制子系统构建了磁流变半主动悬架控制器,用模糊集语言赋值系数反映了悬架伸张行程和压缩行程不对称阻尼控制力的关系。