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讨论了变结构采样控制系统中离散滑动模态存在的条件和满足条件的变结构控制逻辑方程，提出了采样系统的控制延时问题及其数学描述，在此基础上，针对数字控制式调速系统，给出了含控制延时的离散滑模变结构控制器的设计方法，并进行了仿真验证。
The existence of discrete sliding modes in variable structure sampling control system and variable structure control logic equations that satisfy the conditions are discussed. The control delay of sampling system and its mathematical description are proposed. On this basis, System, the design method of discrete sliding mode variable structure controller with control delay is given, and the simulation is carried out.