The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 02, 2014
Filed:
Sep. 14, 2012
Nobuhiko Masaki, Ageo, JP;
Kiminobu Hirata, Saitama, JP;
Jin Kusaka, Tokyo, JP;
Hideaki Kato, Tokyo, JP;
Yasumasa Notake, Tokyo, JP;
Nobuhiko Masaki, Ageo, JP;
Kiminobu Hirata, Saitama, JP;
Jin Kusaka, Tokyo, JP;
Hideaki Kato, Tokyo, JP;
Yasumasa Notake, Tokyo, JP;
UD Trucks Corporation, Ageo-shi, JP;
Waseda University, Tokyo, JP;
Abstract
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.