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| Effects of Fuel Injection Strategy with EGR on Diesel Engine Combustion Process and CDPF Regeneration Performance |
| DOI： |
| Key Words:high pressure common rail diesel engine injection strategy exhaust gas recirculation catalytic particulate filter regeneration performance |
| Author Name | Affiliation | | CHEN Guisheng, WANG Kai, YANG Jie, ZHANG Wei, XU Jinsong, LUO Jing | 1.Yunnan Key Laboratory of Internal Combustion Engine, Kunming University of Science and Technology, Kunming 650500, China
2.School of Energy and Environment, Hebei University of Technology, Tianjin 300401, China |
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| Abstract:Based on a D19 high pressure common-rail diesel engine with VGT (variable geometry turbocharger), an one-dimensional thermodynamic engine model and a three-dimensional CDPF (catalytic diesel particulate filter) model were built by using the GT-Power and AVL Fire. At 3 000 r/min with 50% load, the effects of fuel injection strategy with EGR (exhaust gas recirculation) on engine combustion process and CDPF regeneration performance were studied. The results show that, with the advance of the main-injection timing, the BSFC (brake specific fuel consumption) decreases first and then increases, and the exhaust temperature reduces, while the changes of the exhaust flow and oxygen concentration are not obvious. In addition, the NO in exhaust increases, the CDPF regeneration rate decreases gradually, and the residual particulate matter, pressure drop, as well as NO2 at the CDPF outlet increase simultaneously. With the increase of the EGR rate, the BSFC and exhaust temperature increase, while the exhaust flow, oxygen concentration and NO in exhaust all reduce simultaneously. With delayed main-injection timing, the CDPF regeneration rate increases first and then decreases as the EGR rate increases, while the residual particulate matter decreases first then increases slightly. With earlier main-injection timing, the CDPF regeneration rate reduces while the residual particulate matter increases as the EGR rate increases. With later main-injection timing, increasing the injection pressure can decrease the BSFC and exhaust temperature obviously, while with earlier main-injection timing, improving the injection pressure can increase the BSFC greatly. In addition, with the increase of the injection pressure, the changes of the exhaust flow and oxygen concentration are slight, the NO in exhaust increases, the CDPF regeneration rate decreases slowly, and the residual particulate matter, pressure drop as well as NO2 emission at the CDPF outlet increase simultaneously. In short, compared with the injection pressure, the influence of the main-injection timing on the CDPF regeneration process is greater. |
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