Waseda University

Ud Trucks Corporation

Yasumasa Notake

Kiminobu Hirata

Hideaki Kato

Nobuhiko Masaki

Jin Kusaka

An engine exhaust purification device comprises: a selective reduction type NOx catalyst; an oxidation catalyst disposed on an upstream side of the NOx catalyst; a reducing agent adding device which adds an NOx reducing agent to an exhaust gas of an engine; a control device which controls the reducing agent adding device; and an NOratio calculation device which estimates an NOratio of the exhaust gas flowing into the NOx catalyst. The NOratio of the exhaust gas flowing into the NOx catalyst is calculated by a catalytic reaction model where the oxidation reaction of NO in the oxidation catalyst is numerically formulated, and the NOratio is reflected to calculate an amount of ammonia adsorbed on the NOx catalyst by a catalytic reaction model where a chemical reaction concerned with the reduction of NOx in the NOx catalyst is numerically formulated.

Growing community of inventors

Tokyo, Japan

Yasumasa Notake