A new finite-time tracking strategy for DC motor servo system and its application in vehicle active steering

This paper aims to address a challenging problem in tracking control of the brushless direct current (DC) motor servo systems: achieving the desired tracking accuracy within a prescribed time between the motor’s angle/position and the target signal. The obstacle lies in figuring out the precise control for the DC motor servo systems in the presence of uncertain parameters and unknown disturbances over the infinite time horizon. On the basis of a novel time-varying restricting function established by the tracking accuracy and the settling time, we construct a continuous bounded controller through incorporating a compound function related to the restriction boundaries. Superior to the existing tracking results of DC motor servo systems, the offered methodology could drive the tracking error to a pre-defined region within a pre-specified time while assuring the global boundedness of the closed-loop system’s signals. Finally, several group of simulations of vehicle active steering system are performed to illustrate the effectiveness of the proposed approach.