超精密数控车床加工精度的提高不仅依赖于数控装置的运算速度和曲线的拟合精度，同时还依赖于伺服系统的跟踪精度和点位控制精度。

The manufacture precision of super exactitude NC lathe depends on not only the operation rate of NC deviceand joined precision, but also the error of track and point location about servo system.

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该非线性PID算法构造了增益参数关于误差信号的非线性拟合函数，算法能够同时保证响应速度快、超调量小以及自适应能力强的系统特性。

The nonlinear function is given by the nonlinear PID algorithm, and the algorithm can guarantee the system have the property of the fast response, a little over shot and strong self adaptive.

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