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The Effect of Triple Injection on Engine Performance and Emissions in a HSDI Diesel Engine  

Choi, Wook (Department of Mechanical Engineering, KAIST)
Park, Cheol-Woong (Department of Mechanical Engineering, KAIST)
Kook, Sang-Hoon (Department of Mechanical Engineering, KAIST)
Bae, Choong-Sik (Department of Mechanical Engineering, KAIST)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.12, no.5, 2004 , pp. 40-57 More about this Journal
Abstract
The effects of triple (pilot, main and after) injection on combustion and emission characteristics in a HSDI (High-Speed Direct Injection) diesel engine were investigated using a single-cylinder optical diesel engine equipped with a common-rail injection system. The pilot injection affected the spray and combustion evolution of the following main injection. It was found that the pilot injection reduced the ignition delay, which led to lowered NOx (Nitric Oxides) level, and increased IMEP (Indicated Mean Effective Pressure) due to slow combustion pace during an expansion stroke. The after-injection was shown to be effective in reducing PM (Particulate Matter) even when a small amount of fuel was added. The results suggest that a proper combination of individual injection strategy could bring about a good synergetic effect on engine performance and emission.
Keywords
Triple injection; Pilot injection; Main injection; After-injection; Common-rail; Diesel;
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