Improvement of Combustion in a Diesel-Natural Gas DF-PCCI Engine by Diesel Two-stage Injection 디젤-천연가스 이종연료 예혼합압축착화 엔진에서 디젤 2단 분사를 통한 연소 개선

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A two-stage diesel injection strategy in a diesel-natural gas dual-fuel premixed charge compression ignition (DF-PCCI) engine was investigated under a low load condition. Under this condition, the combustion efficiency becomes low because of the low equivalent ratio. This problem can be solved by supplying more diesel with low natural gas substitution rate(NGSR); however, thermal efficiency deteriorates as a result. As such, the two-stage diesel injection strategy was applied in order to delay the combustion phase at low NGSR of DF-PCCI. The two-stage injection timing was selected based on the thermal efficiency and combustion efficiency of single diesel injection at DF-PCCI combustion. By applying the two-stage diesel injection strategy, despite a slight decline of thermal efficiency, unburned hydrocarbon(UHC) and carbon monoxide(CO) were significantly reduced as compared with the single diesel injection strategy DF-PCCI.
Publisher
Korean Society of Automotive Engineers
Issue Date
2021-05
Language
Korean
Article Type
Article
Citation

Transactions of the Korean Society of Automotive Engineers, v.29, no.5, pp.467 - 475

ISSN
1225-6382
DOI
10.7467/KSAE.2021.29.5.467
URI
http://hdl.handle.net/10203/290559
Appears in Collection
ME-Journal Papers(저널논문)
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