Honda Giken Kogyo Kabushiki Kaisha

Honda Giken Kogyo Kabushiki Kabushiki Kaisha

Hideki Uedahira

Toru Kitamura

Norihiko Suzuki

Masahiro Sakanushi

Shinichi Kikuchi

Yoshiaki Matsuzono

Hiroshi Oono

Ryoko Yamada

Mikio Hara

An exhaust emission control system for an internal combustion engine is provided. The exhaust emission control system () includes a monolith catalyst (MC) that includes an oxygen storage agent and a noble metal-based three-way catalyst including Pd, Rh, and Pt disposed at an upstream location in the exhaust gas flow in the internal combustion engine (), and a perovskite-type double oxide having a three-way catalytic function disposed at a downstream location in the exhaust gas flow. The amount C1 of Pd carried is 0.97 g/L&#x2266;C1&#x2266;1.68 g/L, the amount C2 of Rh carried is 0.11 g/L&#x2266;C2&#x2266;0.2 g/L, the amount C3 of Pt carried is 0.06 g/L&#x2266;C3&#x2266;0.11 g/L, the amount C4 of the oxygen storage agent carried is 25 g/L&#x2266;C4&#x2266;75 g/L, and the amount C5 of the perovskite-type double oxide carried is 5 g/L&#x2266;C5&#x2266;15 g/L. It is thereby possible to provide an exhaust emission control system that can reduce the production cost by reducing the amount of noble metal-based three-way catalyst used and at the same time can maintain a high exhaust emission control rate.

Device for clarifying exhaust gas from internal combustion engine

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.

Apparatus for controlling air-fuel ratio of internal combustion engine

There is provided an exhaust gas recirculation control system and method and an engine control unit for an internal combustion engine, which is capable of properly controlling an exhaust gas recirculation rate in advance according to the NOx-eliminating performance of a catalyst, thereby reducing exhaust emissions. An internal combustion engine eliminates NOx in exhaust gases by a catalytic converter, and recirculates the exhaust gases into an intake pipe. An exhaust gas recirculation control system for the engine includes an ECU. The ECU calculates a NOx exhaust estimate based on the intake pipe absolute pressure and the engine rotational speed detected by the respective sensors, calculates an estimated NOx elimination ratio of the catalytic converter based on an estimated catalyst temperature and the space velocity through the catalytic converter. The ECU calculates an uneliminated NOx estimate based on the NOx exhaust estimate and the estimated NOx elimination ratio, and calculates a target valve lift amount of an EGR control valve based on the uneliminated NOx estimate.

Exhaust gas recirculation control system and method and engine control unit for internal combustion engine

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Wako, Japan

Hideki Uedahira