Analysis and optimization of rail pressure characteristics in high-pressure common rail systems of automotive engines
The mathematical model of the high-pressure common rail injection system of automotive engines was established based on the key component parameters,and the simulation using AMESim software was conducted.The accuracy of the simulation mod-el was verified through experimental analysis.Through the simulation analysis of the system's rail pressure fluctuations and pres-sure characteristics,it was found that the length and inner diameter of the common rail pipe,and the inner diameter of the high-pressure oil pipes are the important parameters that affect the system's rail pressure characteristics.For the original common rail pipe and high-pressure oil pipe models,the response surface method was used to optimize and analyze the parameters of the com-mon rail pipe and high-pressure oil pipes,and obtain the optimal size parameters of the common rail pipe and high-pressure oil pipes with the average rail pressure setting value as the target.After optimization,the average rail pressure of automotive engines'high-pressure common rail injection system improved by 0.65％,the overall average rail pressure fluctuation decreased by 79.48％,the average rail pressure fluctuation during a single injection process decreased by 27.89％,and the average fuel in-jection pressure increased by 0.63％.Its fuel injection characteristics have been significantly improved.
engineshigh-pressure common railAMESim softwareaverage rail pressureoptimization research
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