Abstract
In this study, the fuel injection pressure peak of the pressure amplification common rail fuel system for two-stroke diesel engines was investigated in detail. A prediction model of the fuel injection pressure peak, which takes cubic cross-terms into account, was proposed utilizing the fully validated AMESim model. The Pearson correlation, determination and adjusted determination coefficients of the prediction model are 0.998, 0.997, and 0.984, respectively, indicating an excellent predictive ability. Meanwhile, the maximum relative error between the observed and predicted samples within the training group is only 3.82%, the accuracy of the model was further proved. Then the analysis of variance (ANOVA) was performed upon the developed prediction model, the P-value of each term was used to determine whether it was statistically significant. The results show that the hydraulic piston diameter, fuel plunger diameter, high-pressure fuel tube (HPFT) diameter, and the flow capacity of the pressure amplification control valve (PACV) are significant single factors. For the square terms, the squares of diameters of the fuel plunger and the HPFT impact the fuel injection pressure peak obviously. Among the quadratic terms, the interactions between the diameters of hydraulic piston and HPFT, between the diameters of fuel plunger and HPFT, between the diameter of HPFT and flow capacity of PACV, and between the diameter of fuel plunger and the length of HPFT contribute to the change of fuel injection pressure peak significantly. As for cubic terms, the interaction among fuel plunger diameter, the diameter and length of HPFT is the only one that significantly affects the fuel injection pressure peak. In contrast, the other factors have little impact on the fuel injection pressure peak. Finally, the influence of the significant elements on the fuel injection pressure peak was researched in detail.
Published Version
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