在某些类型的空调系统中，控制器增益的增加将降低系统的能量需求。在这些系统中，增加增益有利于减小节流范围，但增益值过高会导致回路变得不稳定。本研究探索了气动空气温度控制回路的稳定性和不稳定性边界，并开发了一个分析模型来预测控制回路的动态性能。被证明是合适的线圈模型是一个simpleone，它将线圈视为单个金属块。阀门的模型需要考虑滞后效应，控制器的模型是非滞后的- 线性的，因为它需要不同的时间常数来降低控制压力，而不是增加控制压力。引文:阿什雷学报，第84卷，第一部分，佐治亚州亚特兰大

On certain types of air conditioning systems, an increase in the gain of the controller willreduce the energy requirements of the system. In those systems, it is advantageous to increase thegain, thus reducing the throttling range, but a value of the gain that is too high will cause the loop to become unstable.This investigation explored the borderline of stability and instability of a pneumaticair-temperature control loop, and developed an analytical model to predict the dynamic performanceof the control loop. The model of the coil that proved to be adequate was a simpleone that treated the coil as a single block of metal. The model of the valve required inclusionof the effects of hysteresis, and the model of the controller was non-linear in that itrequired a different time constant for decrease of the control pressure in comparison to anincrease in control pressure.