可变气门运动特性测量系统的开发及应用

Development and Application of Measurement System for Motion of Variable Valve

基于发动机上装载的液压连续可变气门机构,设计并开发了一套气门运动特性的测试系统,能够在发动机运行过程中实时测量气门位移及开闭时刻。该测试系统主要包括了气门位移测量组件、曲轴信号测量组件、数据采集卡以及LabVIEW软件测试终端。气门位移测量组件能够实现测量气门位移;曲轴信号测量组件可实现检测压缩上止点信号;数据采集卡同时采集气门位移测量组件和曲轴测量组件的信号并通过LabVIEW软件终端进行显示并读取气门位移以及气门相位的信息。通过测试验证了测量系统的准确性,并利用该系统进一步测试了发动机运转工况下气门位移、开启持续期、气门落座速度的气门运动特性。结果表明该测试系统能够在发动机运行工况下实时准确地对气门运动特性进行测量。

Based on the hydraulic continuously variable valve mechanism loaded on the engine,we design and develop a test system for valve motion characteristics to measure the valve lift and opening/closing time during engine operation.The test system mainly includes valve displacement measurement module,crankshaft signal measurement module,data acquisition card and LabVIEW software test terminal.The valve displacement measuring module can realize the purpose of measuring the valve displacement,and the crankshaft signal measuring module is used to realize the purpose of detecting the compression TDC signal.The data acquisition card simultaneously receives the signals from the valve displacement measurement module and the crankshaft measurement module,and displays them through the LabVIEW software terminal to read the valve displacement and valve phase information.The accuracy of the measurement system is verified by testing.It can and further test the valve movement characteristics of valve lift,opening duration,and valve seating speed.The results show that the test system can accurately and timely measure the valve characteristics under engine operating conditions.