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The Effect of Multiple Injections on the Stability of Combustion and Emissions Characteristic in a Passenger Car Diesel Engine  

Roh, Hyun-Gu (Graduate School of Hanyang University)
Lee, Chang-Sik (Department of Mechanical Engineering, Hanyang University)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.15, no.4, 2007 , pp. 76-82 More about this Journal
Abstract
This paper described the effect of the multiple injections on the stability of combustion and emission characteristics in a direct injection diesel engine at various operating conditions. In order to investigate the influence of multiple injections in a diesel engine, the fuel injection timing was varied one main injection and two pilot injections at various conditions. The experimental apparatus consisted of DI diesel engine with four cylinders, EC dynamometer, multi-stage injection control system, and exhaust emissions analyzer. The combustion and emission characteristics were analyzed for the main, pilot-main injection, pilot-pilot-main injection strategies. It is revealed that the combustion pressure was smoothly near the top dead center and the coefficient of variations is reduced due to the effect of pilot injection. Also, $NO_x$ emissions are dramatically decreased with pilot injection because the decrease of rate of heat release. However, the soot is increased at early pilot injection and main injection.
Keywords
Multiple injection; Pilot injection; Injection; Exhaust emission; Combustion stability;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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