But one cyclecontroller is usually realized by analog circuit and the parameter is easy to vary with the environment, so the integration time constant will vary at the same time.
由于单周控制单元中的积分器需采用模拟电路实现，模拟电路积分时间常数易受电路参数的变化而变化。
2
The Controller — Life cycle events and servlet filters
Controller —— 生命周期事件和 servlet 过滤器
3
The repetitive controller based on the theory of internal model produces correction signal based on the control error of the last cycle to eliminate the error in the latter cycle.