Honda Motor Co., Ltd.

Kei Kuroki

Norihiko Suzuki

Tomohiro Nishi

Yasuo Yamada

Kenji Katayama

Noritaka Sekiya

An exhaust emission control device includes a catalytic converter arranged in an exhaust passage of the internal combustion engine. The catalytic converter includes an upstream catalytic converter and a downstream catalytic converter arranged on a downstream side of the upstream catalytic converter. The upstream catalytic converter includes a first support and a first catalyst supported on the first support. The first catalyst includes a first lower layer catalyst and a first upper layer catalyst. Pd in the first lower layer catalyst is supported only on the oxygen storage component contained in the first catalyst. The first upper layer catalyst is provided on the first lower layer catalyst, Pd in the first upper layer catalyst being supported on each of the oxygen storage component and AlOcontained in the first catalyst.

Exhaust emission control device for internal combustion engine

An exhaust gas purifying device is provided with an exhaust manifold having a collecting section, and a catalytic converter provided downstream of the exhaust manifold. The catalytic converter has upstream and downstream catalysts. The upstream catalyst includes a carrier, a first layer located on the carrier containing Pd, a second layer located on the first layer containing Rh, and a third layer located on the second layer containing Pd. The downstream catalyst includes a carrier, a first layer located on the carrier containing Pd, and a second layer located on the first layer containing Pt and Rh. The collecting section connects to the catalytic converter after passing, in order from the upstream side, through a flow regulating path and a neck section which is provided in the flow regulating path. The flow regulating path has a predetermined length and a width which is gradually reduced to the downstream side.

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Wako, Japan

Kei Kuroki