建立了被动悬架与主动悬架系统的模型 ,通过状态空间法 ,运用Matlab语言 ,对系统的状态量和输出量的能控性和能观测性进行了计算分析 ,并提出了当状态不完全能控时 ,判断哪一个状态量不能控的方法 以某车为例 ,得到了悬架系统对于力执行机构输入u既能控又能观测 ,而对于路面输入不完全能控 ,路面输入对簧载质量速度不产生直接影响的结论 The model of passive suspension and active suspension system is established. By using the state space method and the Matlab language, the controllability and observability of the state quantity and output of the system are calculated and analyzed. And when the state is incomplete When controllable, the method of judging which state quantity can not be controlled takes a certain car as an example, and obtains that the suspension system can not only control but also observe the input u of the actuator, but not completely control the input of the road, The speed of mass does not have a direct effect on the conclusion