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In this study, the exhaust gas composition was clarified by using a gas chromatography, and combustion completion was considered in 2-stroke HCCI engine. In exhaust gas composition, n-Butane was high concentration as opposed to calculation results and intermediate products (CO, C2H4, C3H6, CH4, C2H6) also exhausted. Increasing maximum in-cylinder gas temperature until 1 600 K, combustion efficiency became higher and HC emissions became lower, but over 1 600 K, combustion efficiency kept constant 82±3% and HC emissions became higher again.In actual engine, it was considered that mixture near cylinder wall couldn't be ignited because of heat loss to wall. This region was almost 0.83-1.01 mm from wall by calculated from exhaust gas composition and concentration by 2 models. And the ratio of exhaust n-butane from heat loss to wall in exhaust n-butane is about 79%, from crevice is about 1%, from leak is about 20%.

nihon kikai gakkai ronbunshū. b

A Study of the Combustion Completion on the 2-Stroke HCCI Engine with n-Butane/air Mixture (Investigation of the Exhaust Gas Composition and the Exhaust Mechanism)