Mazda Motor Corporation

Kenta Ando

Masanobu Kanno

Hiroyuki Nishimura

Kenji Tanimura

A NOcatalyst is provided on an exhaust passage of an engine. The NOcatalyst reduces the occluded NOwhen an air-fuel ratio of exhaust gas is in the vicinity of a stoichiometric air-fuel ratio or in a richer state than the stoichiometric air-fuel ratio. Turbocharging is executed by turbochargers. In a low load region within the reduction execution region, a target air-fuel ratio is achieved, as required for NOreduction, by air amount adjustment with an air amount control valve provided on an intake passage. Since a large amount of air is needed in the high load region within the reduction execution region, the target air-fuel ratio is achieved by air amount adjustment using turbocharging pressure control.

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Hiroshima, Japan

Kenta Ando