Research On Multi-objective Parameter And Multi-channel Test System For High Pressure Common Rail System

With the increasingly strict diesel emission standards and the continuous improvement of thermal efficiency,the working pressure of high pressure common rail system is getting higher and higher,the pressure fluctuation will have a huge influence on injection uniformity,constancy,injection accuracy and so on,so this has become the focus of research in the industry.Both the design and development of the high-pressure common rail system and the finite element simulation analysis cannot be separated from the support and verification of experimental data,but in practical application,due to the different requirements of each test bench,the existing test system cannot meet the requirements in terms of parameter types and number of channels.Based on this,this thesis has developed a multi-target parameter multi-multi-channel test system for the high-pressure common-rail system,which can realize the collection,analysis and storage of the stress and strain of the common-rail pipe,the fuel temperature change of the injector and the test signal of the jet pressure fluctuation.The test system takes the FPGA processing module as the core component,first considering the factors affecting the accuracy of the sensor acquisition,designed the signal conditioning circuit suitable for the signal characteristics,and then high-precision ADC is used to convert the signal into digital quantities into FPGA,and finally store the data to the flash memory FLASH.At the same time,the filter capacitor is added to the power supply part to play a role of stabilizing the voltage.To the data to the LABVIEW-based data processing and display software interface through the USB module to optimize and improve the results.The linear calibration and functional verification of the test system are carried out on the common rail platform.The results show that the system has good reliability and applicability,realize high precision synchronous signal acquisition,and meets the requirements of technical indexes.At the same time,the test data is summarized and analyzed,which can provide the measured data support for the simulation of high-pressure common rail system,which is of great significance and engineering application value for the state monitoring and performance optimization of high-pressure common rail system.