呼吸机用比例阀的控制、状态监测及诊断系统设计与实现

Design and Implementation of Control, State Monitoring and Diagnosis System of Proportional Valve for Ventilator

目的设计并实现一种呼吸机用比例阀的控制、状态监测及诊断系统。方法通过对比例阀在不同温度下的运行曲线进行测试,提取比例阀的运行状态参数,根据测试结果采用积分控制器实现对流经比例阀流量的精确控制,以比例阀在极限温度下的运行曲线为基准对比例阀的运行状态进行实时诊断。结果比例阀的流量控制误差优于1%,每次比例阀的控制信号为50的整数倍时对比例阀的运行状态进行一次采集,每10 s对采集的状态数据进行分析诊断,诊断结果为异常时可及时提醒工作人员。结论本研究所设计的呼吸机用比例阀的控制、状态监测及诊断系统能够实现流量的精确控制,比例阀运行状态的实时诊断,能够有效保障比例阀运行的精确性和可靠性。

Objective To design and implement a control,state monitoring and diagnosis system of proportional valve for ventilator.Methods The state parameters of the proportional valve were extracted by testing the operation curves of the proportional valve at different temperatures.According to the test results,the integral controller was used to accurately control the flow through the proportional valve,and the work state of the proportional valve was diagnosed based on the experimental data of the proportional valve at the extreme temperature.Results The flow control error of the proportional valve was better than 1%.Each time the control signal of the digital-to-analog converters named DA was an integral multiple of 50,the work state of the proportional valve was collected.The state data collected were analyzed and diagnosed every 10 s.When the diagnosis result was abnormal,the staff could be reminded in time.Conclusion The control,state monitoring and diagnosis system of the proportional valve for ventilator designed in this study can realize the accurate control of flow and the real-time diagnosis of the work state of proportional valve,which can effectively ensure the accuracy and reliability of the operation of the proportional valve.