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| Influence of post-injection strategy on combustion process and emissioncharacters at low load working condition in lightduty diesel engine |
| 1.School of Automobile and Traffic Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2.Changchai Company Limited, Changzhou, Jiangsu 213001, China) |
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Abstract Taken a lightduty diesel engine as prototype, the influences of postinjection on NOx and soot emission characters, combustion process and fuel consumption were discussed at the operating conditions of low load rate with common speed of 1 600 r·min-1. The results show that internal cylinder temperature rises again in the later of main combustion process due to postinjection. With the increasing of the postinjection fuel quantity, the main combustion section cylinder pressure, the maximum combustion temperature, the average combustion temperature and the peak value of the main combustion heat release rate are all gradually decreased. The main combustion section cylinder pressure and the peak combustion heat release rate increase slightly with the increasing of the postinjection interval angle, while the average combustion temperature decreases.At the condition of low load rate, NOx and soot emissions can be efficiently reduced by postinjection and gradually decreased by the increase of postinjection fuel quantity. With the increasing of postinjection interval angle, the NOx emission gradually decreases and the soot emission shows an upward trend after the initial decrease. The fuel consumption is increased by postinjection and the increasing of postinjection fuel quantity and postinjection interval angle.
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2011, Vol. 32 
