Honda Motor Co., Ltd.

Honda Giken Kogyo Kabushiki Kaisha

Mikio Hara

Takeshi Honda

Masatatsu Enami

Yasushi Matsuura

Toru Kitamura

Hideki Uedahira

An intake manifoldincludes: a surge tankthat is connected on an upstream side thereof to a throttle valve; multiple branch pipesthat are arranged side by side in a longitudinal direction of the surge tankand respectively connected to cylinders; and a PCV chamberthat is provided upstream of a central part in the longitudinal direction of the surge tank. The intake manifold includes: a blowby gas introduction portthat is designed to introduce blowby gas into the PCV chamber; and a blowby gas exhaust portthat is designed to discharge the blowby gas from the PCV chamberinto the surge tank, and the blowby gas exhaust portis located at a position higher than the blowby gas introduction port

Intake manifold for engine

An intake manifoldincludes: a blowby gas introduction portthat is configured to introduce blowby gas into a PCV chamber; a blowby gas exhaust portthat is configured to discharge the blowby gas from the PCV chamberinto a surge tank; and a drain holethat is configured to discharge water contained in the blowby gas, from the PCV chamberinto the surge tank. A bottom wallof the surge tankincludes protruding partsthat protrude upward, the blowby gas exhaust portis located upstream of the most upstream side protruding partlocated on the most upstream side, and the drain holeis located downstream of the most upstream side protruding part.

The air-fuel ratio of an air-fuel mixture to be combusted in an internal combustion engine is manipulated to converge an output VO /out of an O sensor which is disposed downstream of a catalytic converter to a target value VO /TARGET depending on an operating state of the internal combustion engine , while at the same time a deterioration evaluating parameter is determined from time-series data of the output VO /out of the O sensor . The value of the deterioration evaluating parameter is corrected depending on an average value of the output VO /out of the O sensor or the target value VO /TARGET, and the deteriorated state of the catalytic converter is evaluated based on the corrected value of the deterioration evaluating parameter.

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Wako, Japan

Mikio Hara