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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. The measurements are focused upon tile first 30 seconds of operation after starting. with the engine and coolant initially at ambient temperature because tins 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 AID 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 O2 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 and engine speed to avoid engine torque fluctuation.


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Abstract

1. 서론

2. 실험장치 및 실험방법

3. 결과 및 고찰

4. 결론

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UCI(KEPA) : I410-ECN-0101-2009-556-013983079