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International Journal of Automotive Technology > Volume 12(5); 2011 > Article
International Journal of Automotive Technology 2011;12(5): 639-644.
EFFECT OF A 2-STAGE INJECTION STRATEGY ON THE COMBUSTION AND FLAME CHARACTERISTICS IN A PCCI ENGINE
YUNGJIN KIM1, Kibum Kim2, Ki-hyung Lee1
1Hanyang University
2Chungbuk National University
ABSTRACT
Recently, to reduce environmental pollution and the waste of limited energy resources, there is an increasing requirement for higher engine efficiency and lower levels of harmful emissions. A premixed charge compression ignition (PCCI) engine, which uses a 2-stage type injection, has drawn attention because this combustion system can simultaneously reduce the amount of NOx and PM exhausted from diesel engines. It is well known that the fuel injection timing and the spray angle in a PCCI engine affect the mixture formation and the combustion. To acquire two optimal injection timings, the combustion and emission characteristics of the PCCI engine were analyzed with various injection conditions. The flame visualization was performed to validate the result obtained from the engine test. This study reveals that the optimum injection timings are BTDC 60
Key Words: Flame visualization, Emissions, Premixed charge compression ignition (PCCI), NOx, PM
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