Calibratiom On A Diesel Engine Coupling EGR And Injection Parameters

Diesel engine with advantages powerful, good economy and clean emissions is favored by more and more people. But the energy crisis and environmental pollution is still two huge challenges for diesel engine developing.Exhaust gas recirculation technology has been widely used in diesel engines as the most effective means of purify NOx in the machine. Join the exhaust gas recirculation technology on diesel engine performance, fuel economy and emissions have influenced.Therefore need to re-calibration the diesel engine, according to people’s expectations and different working conditions have different requirements.There are a large number of working conditions have to calibration. The traditional test calibration, it takes a lot of manpower and material resources to carry out this work, and in the calibration process nor precise control of EGR rate.usually through EGR valve’s opening size to determine the size of the EGR rate with no a quantitative analysis.Explore and establish a EGR calibration process by bluiding a research platform combine simulation and experimental. Analysis the influence law of the EGR rate under different working conditions on the simulation platform. In the high load when the appropriate EGR rate can improve the NOx emission performance and impact on the performance and fuel economy are small, but too much power performance and fuel economy can be much worse. Low load is relatively high load can be used in a larger EGR rate and less effect on the performance and fuel economy. Further analysis of fuel injection advance angle on different conditions, different EGR rate under the coupling effect. By comprehensive considering the performance, fuel economy and emissions of a relatively optimal EGR rate and fuel injection advance angle interval. Indirectly to evaluate an EGR rate on the platform. With the range provide reference for experimental calibration, verification on the test platform. The results show that this method can provide targeted guidance in the EGR test calibration, reduce the EGR calibration time and effort.The transient performance gradually become the focus of the research and the intersection point with development. Introducing EGR changes the structure of the intake manifold, to each cylinder has a great influence on inhomogeneity. Using the model analysis of different EGR mixing length for each cylinder EGR rate fluctuations.The results show that with the increase of EGR mixing length, each cylinder EGR rate gradually become target EGR rate. Under different working condition of each cylinder EGR rate of good consistency also have different mixing length you need.