摘要: In this paper, the controllability of a switched linear system, which is collection time-invariant systems along with some maps for "switching" among them, addressed. First, controllable state set defined as basic tool to discuss condition. Next, it proved that multi-input system equivalent single-input system. Finally, sufficient and necessary condition third-order presented. According proof criterion, we conjecture on n-dimensional systems. A numeric example given illustrate result.