• Title/Summary/Keyword: 고속 THC 분석기

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Dependence of Nanoparticle and Combustion Characteristics of Gasoline Direct Injection Engines on Coolant Temperature (GDI 엔진의 냉각수온에 따른 연소성능 및 입자상 물질 배출 특성)

  • Lee, Hyo-Keun;Choi, Kwan-Hee;Myung, Cha-Lee;Park, Sim-Soo;Park, Jong-Il;Han, Seung-Kook
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.36 no.2
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    • pp.131-136
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    • 2012
  • This paper investigated the combustion and exhaust gas characteristics of gasoline direct injection engines for various cooling water temperature. The engine-out nanoparticle emission number and size distribution were measured by a DMS-500 equipped upstream of the catalyst. A CLD-400 and an HFR-400 were equipped at the exhaust port to analyze the cyclic NOx and total hydrocarbon emission characteristics. The results showed that the nanoparticle emission number greatly increased at low coolant temperatures and that the exhaust mainly contained particulate matter of 5.10 nm. THC also increased under low temperature conditions because of fuel film on the combustion chamber. NOx emissions decreased under high temperature conditions because of the increase in internal exhaust gas recirculation. In conclusion, an engine management system control strategy for driving coolant temperature up rapidly is needed to reduce not only THC and NOx but also nanoparticle emissions.

Cycle-by-Cycle In-cylinder HC & NOx Formation Characteristics with Port Masking in CVVT Engine (포트 마스킹과 흡기 밸브 타이밍이 실린더 내부의 싸이클별 HC와 NOx 생성에 미치는 영향)

  • Jeon, Woo-Ju;Choi, Kwan-Hee;Myung, Cha-Lee;Park, Sim-Soo;Lee, Kyung-Hwan
    • Proceedings of the KSME Conference
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    • 2008.11b
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    • pp.3108-3113
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    • 2008
  • This paper investigated the behaviors of combustion characteristics at part load condition with various intake charge motions induced by the port masking schemes in the CVVT (Continuously Variable valve Timing) engine. Time resolved in-cylinder and exhaust emissions were measured by the fast response HC and NOx analyzers to examine their formation mechanisms and behavior characteristics. As a result, in-cylinder HC decreased with the advanced intake valve timings but HC at the exhaust port increased due to the worse combustion stabilities. However HC reduction could be achieved by the application of the port maskings with a enhancement of the engine stability. NOx also decreased with early intake timings by internal EGR but increased with the charge motion controls which enhance the combustion behavior.

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A Study on Cold Start Emission Characteristics using the Syngas in a SI Engine (합성가스를 이용한 SI 엔진의 냉간시동 배기가스 배출특성에 관한 연구)

  • Song, Chun-Sub;Kim, Chang-Gi;Kang, Kern-Young;Cho, Yong-Seok
    • Transactions of the Korean Society of Automotive Engineers
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    • v.16 no.3
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    • pp.66-72
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    • 2008
  • Fuel reforming technology for the fuel cell vehicles could be adopted to internal combustion engine for the reduction of engine out emissions. Since syngas which is reformed from fossil fuel has hydrogen as a major component, it has abilities to enhance the combustion characteristics with wide flammability and high speed flame propagation. In this paper, syngas was feed to 2.0 liter gasoline engine during the cold start and early state of idle condition. Not only cold start HC emission but also $NO_x$ emission could be dramatically reduced due to the fact that syngas has no HC and has nitrogen up to 50% as components. Exhaust gas temperature was lower than that of gasoline feeding condition. Delayed ignition timing, however, resulted in increased exhaust gas temperature approximated to gasoline condition. It is supposed that the usage of syngas in the gasoline internal combustion engine is an effective solution to meet the future strict emission regulations by the reduction of cold start THC and $NO_x$ emissions.