针对一类具有未知不确定性范数上界的线性时滞系统 ,设计自适应近似变结构控制器 ,对系统的不确定性范数上界进行在线估计 ,近似变结构控制器使系统进入滑模运动区域 ,保证系统的一致终结有界性 ,进而用李雅谱诺夫函数方法分析了所得控制系统的性能 .所提出的近似自适应变结构控制器可以避免控制器中的不连续继电项 ,同时不必已知系统不确定性范数界 .用数字仿真例子验证了所提出控制器设计方法的有效性 For a class of linear time-delay systems with unknown upper bound of norm uncertainty, an adaptive approximation variable structure controller is designed to estimate the upper bound of the system’s norm uncertainty. The approximate variable structure controller Modal motion region to ensure that the system has a uniform ending and boundedness, then the Lyapunov function method is used to analyze the performance of the obtained control system.The proposed adaptive variable structure controller can avoid the discontinuous relay in the controller Without having to know the norm boundary of the system uncertainty.The numerical simulation example is used to verify the effectiveness of the proposed controller design method