Due to the influence of non-linear dynamic characteristic of clutch, time-delay, external disturbance and parameter variation, the automated clutch is hard to control precisely during the engaging process of the automated clutch of automatic mechanical transmission (AMT) vehicle. In this paper, region-wise linear fuzzy sliding mode controller (RWLFSMC) is applied to the automated clutch which is driven by a brushless DC motor. The fuzzy rule number of RWLFSMC is decreased by introducing the region-wise linear technology. In order to achieve the control objective, a scaling factor tuner is used in the controller. The simulation results showed that the proposed controller was effective and robust to the parametric variation and external disturbance in comparison with the conventional fuzzy sliding mode controller (FSMC).