一种轨道车辆空调电子膨胀阀调节的试验调试与计算方法

Test Process and Calculation Method of Electronic Expansion Valve Adjustment for Rail Vehicle Air Conditioner

介绍了某型号轨道车辆空调电子膨胀阀调节的试验调试过程,通过调节膨胀阀的开度以使压缩机排气温度逼近到相应目标值。试验中依次确定了阀的初始最短可调时间、调节时间间隔和调节步距。进而在试验数据基础上总结了一种电子膨胀阀调节的计算方法,计算结果与空调机组的试验数据较为吻合。通过该方法计算并控制电子膨胀阀的调节,使排气温度变化过程平滑连续,满足排气温度的变化响应和稳定性要求,并为其它空调控制电子膨胀阀的调节提供了借鉴。

This paper introduces the test process of the electronic expansion valve adjustment of a certain type of railway vehicle,and how to adjust the opening degree of the expansion valve to make the compressor exhaust temperature close to the corresponding target value.The initial adjustment time of the valve,adjusting time interval and adjusting step were determined in the experiment.Based on the experimental data,the calculation method of the electronic expansion valve adjustment is summarized.The calculation results are in good agreement with the test data of the air conditioner.By the method of calculation and control of electronic expansion valve,exhaust temperature changes more smoothly,to meet the change of exhaust temperature response and stability requirements,and provide a reference to control other air-conditioning electronic expansion valve.