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1 Journal of KONES

1 2004

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Real time HC concentration measutrement in exhaust gas from a spark-ignition engine by using 3.392 mi m absorption method

Tomita E., Kawahara N.

Journal of KONES

2004

Vol. 11, No. 3-4

280-287

It is a problem that unburned hydrocarbons are exhausted at cold start in spark-ignition engines. In this study, an infrared absorption method was applied to in-situ measurement of hydrocarbon concentration. A He-Ne laser was used as an incident light and reflected three times in the exhaust pipe to make the measurement length long enough to determine the HC. As a result, misfire is detected without fail. It was found that the HC concentration has a relation to indicated mean effective pressure. In late ignition timing, the temperature of the exhaust gas increases and the HC concentration decreases while the cycle-to-cycle fluctuation of mean eff'ective pressure increases. When the fluctuation is large, the HC is larger in the cycle of lower mean effective pressure and the HC is smaller higher one.