According to the actual conditions

a switched system model and a control strategy based on the output feedback switching strategy method are proposed for a semi-active suspension system in this work. On the basis of this

in order to further analyze the control effect of the control strategy

a road roughness is produced based on the rational function filter white noise generation method

then analysis and comparison simulation about the vibration produced by the road roughness are carried out by MATLAB／Simulink. The simulation results show that compared with the passive suspension

the low-frequency semi-active suspension control strategy based on switching control is 22% lower

the suspension deflection is 36% lower

and the tire dynamic load is 13% lower. The results show that the low frequency semi-active suspension control strategy based on switching control can improve the dynamic performance of the vehicle and improve the ride comfort and handling stability of the vehicle.