Research On The Application Of Domestic Common Rail System To CA4D28Diesel Engine

Since the beginning of twenty-first Century, diesel engine is facing challenges of twoconstraints, energy and environmental protection. To improve economy and control theemission has became an important problem for diesel engine industry. The social needs ofeconomy and environmental protection in the future put forward high requirements to dieselengine. The demand of technology upgrades for diesel engine is imminent. In order tocontrol diesel engine emissions, countries establish strict emissions regulations, but it doesnot become obstacles to the development of diesel engine, and it acts as a direct impetus todiesel engine technology progress. Economy and emissions of diesel engine are closelyrelated with diesel engine combustion process, the most feasible technical pathway toimprove diesel engine performance is to improve diesel engine fuel system. It controls thefuel injection quantity, injection timing and injection rate by using electronic fuel injectioncontrol technology, so that it can achieve a good organization of diesel engine combustionprocess, and obtain a performance optimization of economy, power and emissions undervarious conditions.Changchun FAW Sihuan Engine Manufacture Co.,Ltd. and Liaoning XinfengEnterprise Group Gil Fuel Injection Co.,Ltd. jointly proposed the project about"Development and industrialization of diesel engine Model CA4D28domestic common railsystem ",in order to reduce production cost and promote localization process of highpressure common rail fuel injection system. Through this project, the author, I haveoptimized and upgraded Xinfeng common rail system, and I have also completed emissioncalibration of ZTE pickup equipped by diesel engine Model CA4D28. This paper firstanalyzes the domestic and foreign research results of high pressure common rail electroniccontrolled injection system, it presents that one of the main factors to the fuel injectorperformance is shim thickness in the injector design scheme. The main work is to studyLiaoning Xinfeng common rail fuel injection system, it puts forward perfect injection lawand control strategy, and it expounds the way to realize the ideal fuel injection law from fouraspects, the high-pressure rail, high pressure pump, fuel injector and ECU; then it presentscalibration and development of the test bench for diesel engine Model CA4D28.The nextstep it focuses on the effect of fuel injector shim thickness on diesel engine performance. it optimize fuel injectors matched with varying thicknesses shims by using650ml and700mlfuel injectors as two optimal paths. Finally it determines the optimal combination betweeninjector and shim thickness as the final structure of Xinfeng system. After compared withBosch second generation common rail system, the experimental results show that externalcharacteristics and specific fuel consumption of Xinfeng system is better than the ones ofBosch system, it proves that the research work is successful.In this paper, after completing the combination optimization between injector and shimthickness of Xinfeng system, we built hub test bench to implement vehicle emissioncalibration experiments of ZTE pickup equipped with diesel engine Model CA4D28,Regarding GB18352.5-2013as the test basis, with standard detecting diesel for state IV,we implement7times emission tests without post processing and27times emission testswith post processing on the hub test bench of Changchun FAW Sihuan Engine ManufactureCo.,Ltd. Finally we analyze the vehicle emission calibration process based on the22nd,26th,27th experimental data, and the results show that vehicle emissions of ZTE pickup equippedwith diesel engine Model CA4D28achieve State IV emission standard.