Mazda Motor Corporation

Kazuma Uchiyama

Daishi Ikeda

Goro Tsuboi

An engine includes: an NOx catalyst and an SCR catalyst in an exhaust passage; an excess air ratio change device that changes an excess air ratio of an exhaust gas; and a reducing agent supply device that supplies a reducing agent for SCR including a material for NHor NHto a portion between the NOx catalyst and the SCR catalyst in the exhaust passages. The engine controls the reducing agent supply device in such a manner that a quantity of the reducing agent for SCR to be supplied from the reducing agent supply device to the exhaust passagebecomes small when the excess air ratio of the exhaust gas during regeneration control to regenerate the NOx catalyst is small, as compared to when the excess air ratio &#x3bb; of the exhaust gas during regeneration control to regenerate the NOx catalyst is large.

Growing community of inventors

Aki-gun, Japan

Kazuma Uchiyama