• Title/Summary/Keyword: 동기화된 2차공기분사

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Reducing Exhaust Hydrocarbon at Gasoline Engine with Catalytic Converter using Synchronized Secondary Air Injection (촉매가 장착된 가솔린엔진에서 동기화된 2차공기분사에 의한 배기 탄화수소 저감)

  • 심현성;민경덕;정석호
    • Transactions of the Korean Society of Automotive Engineers
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    • v.9 no.2
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    • pp.67-74
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    • 2001
  • A synchronized secondaty air injection method has been developed to hydrocarbon emission by injecting secondary air intermittently into exhaust port. The method has been tested in a single cylinder spark-ignition engine operating at cold-steady / cold-start conditions. Effects of air injection timing, intake pressure and engine air-fuel ratio have been investigated at cold-steady condition. Also, hydrocarbon emission and exhaust gas temperature with catalytic conberter are compared with a continuous SAI method and base condition at cold-start condition. Resules show that hydrocarbon reduction rate and exhaust gas temperature are sensitive to the timing of synchronized SAI. At cold-steady condition, HC emission is minimum at engine air-fuel ratio of 10. At cold-start condition, the accumulated hydrocarbon emission during the first 120 s decreases about 56% and 22% with the synchronized and continuous SAI, respectively, compared to that of base condition.

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