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[가솔린엔진부문] 2차 공기분사 및 냉각수제어에 의한 SI 엔진의 탄화수소 배기 저감
박심수(Keesoo Park),박기수(Simsoo Park) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1999 No.11_1
It is well known that the majority of the emissions measured from vehicle exhaust in the US Federal Test Procedure(FTP-75) are emitted during the first 60 seconds. This paper describes an experimental study on SI engine emissions reduction after cold start with interval secondary air injection and coolant control. Secondary air injection after cold start to reduce exhaust emissions causes an exothermic reaction at the exhaust port and gives sufficient air to the catalyst. For that reason ‘ engine-out emissions oxidized in the exhaust port and the rapid heating of a catalytic converter after cold start with CSAI and ISAI are estimated<br/> The influence of the coolant temperature on SI engine emissions has been estimated. In the present study ’‘ coolant control of the cylinder head temperature is used to investigate the effect of coolant temperature on SI engine emissions<br/> The results show that engine-out hydrocarbon and carbon monoxide emissions are considerably reduced with interval secondary air injection and coolant control.