Application Of Virtual Instrument Technology In Engine Components And Combustion Experiment Device

The research of engine components and fuel combustion characteristics is inseparable from the corresponding test device,and the test system is the key to ensuring the success of the test.Among them,the measurement and control software with friendly human-computer interaction interface,high fault tolerance and high reliability plays an important role.According to the basic requirements of piston ring friction measurement and constant volume bomb test,the hardware system of the measurement and control system is built or developed separately,and the corresponding measurement and control software is designed based on the LabVIEW development environment.The main research contents include:(1)Design of the friction data collection system of the piston ring group.Use the crankshaft position sensor,tension and compression sensor,charge amplifier,incremental angle encoder,high-speed synchronous data acquisition card and computer to build a hardware platform,develop the host computer data acquisition software,and test with the engine test bench test system to determine different crankshaft angles The relationship between the friction force of the lower piston ring and the cylinder liner provides data support for further reducing friction loss and improving engine performance.(2)Design of measurement and control system for constant volume combustion bomb test.Using the coordinated working mode of the upper and lower computers,based on the MC9S12XEP100 microcontroller,the controller hardware and the corresponding embedded system software are designed to achieve ignition and timing control,high-speed camera trigger control,pressure collection in the combustion bomb,ion current signal collection and flame Image acquisition and other functions.At the same time,the man-machine interface interactive software has the functions of digital communication,state parameter configuration,status display,digital display,image display,data,video playback,fault warning etc.Function.(3)Finally,in order to verify the reliability of the constant volume combustion bomb measurement and control system and the cylinder liner-piston ring set friction force collection system designed for this subject,they were simulated in the laboratory.The test results show that the constant volume combustion bomb measurement and control system and the cylinder liner-piston ring set friction forceacquisition system have achieved the expected design results.