Abstract:To solve the problem that some state parameters, such as roll angle and pitch angle, in active suspension control process are too difficult to measure on-line, this paper presents a method of vehicle state estimation using a dynamic sliding mode observer with a 7 degree-of-freedom model of the vertical vehicle dynamics as an essential component. The observer relies on suspension sensors and stability system sensors. The effect of uncertainty is greatly reduced even with unknown road inputs. The design is verified through simulation and vehicle testing under variety of maneuvers and it provides a feasible, accuracy and low-cost way for measurement of vehicle state parameter.