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:
Aug. 01, 2017
Filed:
Mar. 10, 2016
Toyota Jidosha Kabushiki Kaisha, Toyota-shi, Aichi-ken, JP;
Kazuhiro Umemoto, Ebina, JP;
Toshihiro Mori, Gotenba, JP;
Hiroshi Kobayashi, Susono, JP;
Shigeki Nakayama, Gotenba, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota-shi, Aichi-ken, JP;
Abstract
In an engine exhaust passage, in order from an exhaust upstream side, an NOstorage and reduction catalyst, NO oxidation catalyst, NOreduction catalyst, and selective reduction catalyst may be arranged. An air-fuel ratio of an exhaust gas which flows into the NOstorage and reduction catalyst may be temporarily switched to a rich air-fuel ratio which may be adapted for generating ammonia from NOwhich may be stored in the NOstorage and reduction catalyst. The ammonia, which may be generated by the NOstorage and reduction catalyst, may be held at the selective reduction catalyst. The NOwhich flows into the selective reduction catalyst may be reduced by the ammonia. The NO oxidation catalyst and NOreduction catalyst may be used to make an NO ratio of the exhaust gas which flows into the selective reduction catalyst approach an optimum ratio of the selective reduction catalyst.