Research And Design Of Natural Gas Injector Measurement And Control System

The compressed natural gas (CNG) injector is the ke y parts in CNG engine. Theperformance of CNG injector has significant influence in exhaust emission and economicperformance of CNG engine. Development of CNG injector measurement and controlsystem has proprietaryintellectualpropertyrightsis very important for development of CNGinjection system.Finish the development of CNG injector measurement and control system hasproprietaryintellectualpropertyrightsanalyzing the working principle of CNG engine, thedevelopment of CNG engine, the design requirement of CNG injector measurement andcontrol system, the de sign scheme of CNG injector measurement and control system, andresult of CNG injector measurement and control system.The thesis introduces requirement analysis of CNG injector measurement and controlsystem, test solution of CNG injector measurement and control system, and the designscheme base on requirement analysis. Finish development of drive system, air supplysystem, air measure system and monitor system, and achieve the whole system closed loopcontrol base on the design scheme. First test the accuracy and stability of the system testresult base on the test scheme, second test the reliability of the system, last test the resultby CNG engine.The significance of the study in this thesis is that we have successful developed theCNG nozzle measurement and control system, the system meets the requirement of thedevelopment of the CNG nozzle. It has been found that the system can supp ly compressedair，drive the nozzle stably，and be easily operated. The de velop ment of the system has made a contribution to the CNG nozzle de velop ment.