An integral variable structure control scheme for non-overshooting responses

This article presents an improved integral variable structure control scheme to avoid overshooting responses for a class of second-order plants. The proposed sliding dynamics have two integral state variables. One integral state variable is initially specified to enable existence of a sliding mode throughout an entire response. The other’s initial value is assigned to avoid overshooting output responses. It is shown that the integral state is initially chosen to be a nonlinear function of the plant’s initial state to avoid an overshooting response. This article also reports the experimental results for controlling the position of a screw-driven actuator with various payloads and initial velocities, in order to show the effectiveness of the proposed scheme.