阀头线型对蒸发器非线性补偿的理论与试验研究

通过将电子膨胀阀与受控对象（蒸发器）细化分开来，并依据恒定开环增益准则从理论上分析了阀头补偿原理。依据特性试验结果量化分析了蒸发器变增益的非线性特征和电子膨胀阀的流量特性增益，并根据阀头补偿原理设计出了具有补偿功能的阀头线型。通过冷启动、蒸发器变负荷和过热度设定值改变的对比试验检测了补偿性阀头的控制特性，结果表明补偿性阀头的变增益特性使电子膨胀阀控制特性得到了改善，蒸发器过热度被降低。

Experimental and Theoretical Research on Valve Head Compensation for Nonlinear Characteristic of Evaporator

Through dividing electronic expansion valve from evaporator system and based on constant gain of superheat open loop rule, the compensation theory of valve head was analyzed. On the basis of compensation theory and the characteristic experiment results, a valve head was designed which has compensation function for evaporator nonlinear characteristic. Moreover, a series of comparison tests were performed. The result shows that the compensation valve head improved the control characteristic of electronic expansion valve and the superheat of the evaporator decreased.