4. Switching controllerWithout loss of generality, it can be assumed that . When the initial state , we have given the controller (3) and (23) for and of system (1). Now, we turn to discuss how to select the control laws and when .In the absence of the disturbances, most commonly used control strategy is to use constant control in time interval . In this paper, we also use this method when , choose as follows: Since , from (1)we known that