Abstract:A portable measurement and control system is designed and developed according to the control requirements of a hot car test bench for the pressure and flow parameters of the air circuit. The system uses NI CDAQ series products to build the hardware platform. The 4-slot CDAQ-9185 Ethernet chassis is equipped with CDAQ-9203 analog input module, CDAQ-9265 analog output module and CDAQ-9401 I/O module, which can meet the requirements of harsh test environment and mobile remote measurement and control; LabWindows/CVI is selected as the software development platform to ensure the system's requirements for execution efficiency; Ping pong operation and multithreading technology are used to control the data flow, realizing real-time storage of high-speed data acquisition, saving computing resources and speeding up system response; The incremental PID control algorithm is used to realize the automatic adjustment of the pipeline flow. Through the debugging of the proportional coefficient, integral time and differential time, the requirements of the system for control accuracy are met. The test results show that the control system runs stably, responds quickly, can save and display the current parameters of the gas path in real time, effectively control the pressure and flow of the gas path, and meets the test control requirements of the test bench. It has been officially put into use.
