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학술대회자료
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한국자동차공학회 한국자동차공학회 Workshop 한국자동차공학회 2001년 워크샵(내연기관배기)
발행연도
2001.3
수록면
21 - 33 (13page)

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초록· 키워드

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It is well known that unburned hydrocarbons are abundantly emitted into the atmosphere at cold start in SI engine. Many nations tend to enforce regulations of emission much more strictly. This study was conducted to develop a system which reduces HC emissions at cold start using the device of temporary storage and recombustion after analyzing the emission characteristics of hydrocarbons during the cold start. The exhaust gas measurements are focused upon the first 30 seconds of operation after starting, with the engine and coolant initially at ambient temperature because this period has a major effect on HC emissions, over the FTP cycle. The engine examined is a 4-cylinder, 16-valve SI engine. K type thermocouples attached on the O2 sensor, the catalytic converter and the coolant, and each sensor for the engine were connected to the AfD board to find the parameters for storage time and recombustion mode. The emissions were initially enriched in light fuel alkanes and depleted in heavy aromatic species. It was decided that the maximum storage time was 30 seconds at cold start. The time for storage was decreased with warmed start because the 02 sensor's conversion at warmed start is much faster than that at cold start. The recombustion mode was selected by using the rate of throttle valve, engine speed, and operation conditions of purge solenoid valve to avoid engine torque Ouctuation.

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ABSTRACT

1.서론

2.실험장치 및 실험방법

3.결과 및 고찰

4.결론

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