Stability condition of the proportional control algorithm is given for a fixed target. 针对固定目标，文中给出了比例控制算法的稳定性条件。
The sliding mode control is used to eliminate the uncertainties.Its performance is compared with propotional control to verify the effectivenss of sliding mode control. 然后藉由滑动模式控制器来解决气压伺服系统中不稳定因素造成的控制问题，并对照比例控制的结果，验证滑动模式控制器对于气压伺服系统的实用性。
