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:
Oct. 15, 2019
Filed:
Jan. 08, 2018
Mazda Motor Corporation, Aki-gun, Hiroshima, JP;
Masanobu Kanno, Hiroshima, JP;
Takayuki Yamaguchi, Hatsukaichi, JP;
Masayuki Tetsuno, Hiroshima, JP;
Mazda Motor Corporation, Aki-gun, Hiroshima, JP;
Abstract
An exhaust emission control system is provided, which includes a NOstorage catalyst provided in an exhaust passage of an engine and configured to store NO, a urea SCR catalyst provided in the exhaust passage, downstream of the NOstorage catalyst, and a NOreduction controlling module configured to set a NOreduction condition and, when the NOreduction condition is satisfied, performs NOreduction processing in which an air-fuel ratio of exhaust gas is set to be one of near a stoichiometric air-fuel ratio and rich, and the NOstored in the NOstorage catalyst is reduced, the NOreduction condition being set looser for the NOreduction processing performed the first time after the engine is started than the NOreduction processing performed the second and subsequent times after the engine is started.