| 제목 |
가솔린 엔진의 배기 열교환기가 촉매 온도에 미치는 영향에 관한 연구 |
| 분야 |
엔진 및 연소 |
| 언어 |
Korean |
| 저자 |
이석환(한국과학기술원), 배충식(한국과학기술원) |
| Key Words |
Heat exchanger(열교환기), Close-coupled catalyst(근접장착촉매), Cold start(냉간시동), Light-off time(활성화시간), Fuel enrichment(연료증량), Fuel economy(연료경제성) |
| 초록 |
Close-coupled catalyst (CCC) can reduce the engine cold-start emissions by utilizing the energy in the exhaust gas. However, in case the engine is operated at high engine speed and load condition, the catalytic converter may be damaged and eventually deactivated by thermal aging. Excess fuel is sometimes supplied intentionally to lower the exhaust gas temperature avoiding the thermal aging. This sacrifices the fuel economy and exhaust emissions. This paper describes the results of an exhaust heat exchanger to lower the exhaust gas temperature mainly under high load conditions. The heat exchanger was installed between the exhaust manifold and the inlet of close-coupled catalytic converter. The exhaust heat exchanger successfully decreased the exhaust gas temperature, which eliminated the requirement of fuel enrichment under high load conditions. However, the cooling of the exhaust gas through the heat exchanger may cause the deterioration of exhaust emissions at cold start due to the increment of catalyst light-off time.{{br}} |
| 원문(PDF) |
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