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Performance and Emission Characteristics in a Spark-Ignition LPG Engine with Exhaust Gas Recirculation  

조윤호 (현대자동차)
구준모 (한국과학기술원 기계공학과)
장진영 (한국과학기술원 기계공학과)
배충식 (한국과학기술원 기계공학과)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.10, no.1, 2002 , pp. 24-31 More about this Journal
Abstract
An experimental study was conducted to investigate the effects of EGR (Exhaust Gas Recirculation) variables on performance and emission characteristics in a 2-liter 4-cylinder spark-ignition LPG fuelled engine. The effects of EGR on the reduction of thermal loading at exhaust manifold were also investigated because the reduced gas temperature is desirable for the reliability of an engine in light of both thermal efficiency and material issue of exhaust manifold. The steady-state tests show that the brake thermal efficiency increased and the brake specific fuel consumption decreased with the increase of EGR rate in hot EGR and with the decrease of EGR temperature in case of cooled EGR, while the stable combustion was maintained. The increase of EGR rate or the decrease of EGR temperature results in the reduction of NOx emission even in the increase of HC emission. Furthermore, decreasing EGR temperature by $180^{\circ}C$ enabled the reduction of exhaust gas temperature by $15^{\circ}C$ in cooled EGR test at 1600rpm/370kPa BMEP operation, and consequently the reduction of thermal load at exhaust. The optimization strategy of EGR application is to be discussed by the investigation on the effect of geometrical characteristics of EGR-supplying pipe line.
Keywords
EGR(Exhaust Gas Recirculation); EGR rate; EGR temperature; Hot EGR; Cooled EGR;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
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