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:
May. 11, 2004
Filed:
Sep. 26, 2002
Kenji Harima, Toyota, JP;
Koichi Hoshi, Toyota, JP;
Hiromasa Suzuki, Toyota, JP;
Takashi Watanabe, Toyota, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
The air/fuel ratio (A/F) controller for an internal combustion engine having an upstream catalyst, a hydrocarbon-adsorbent exhaust purification (HAEP) catalyst that is disposed downstream from the upstream catalyst, an upstream A/F sensor disposed upstream from the upstream catalyst, a downstream A/F sensor disposed downstream from the HAEP catalyst, a middle A/F sensor disposed between the upstream catalyst and the HAEP catalyst, an A/F main feedback (F/B) control unit, and an A/F sub-F/B control unit. The A/F main F/B control unit performs main F/D control such that the exhaust A/F detected by the upstream A/F sensor is kept at a specific main F/B target A/F. The A/F sub-F/B control unit performs sub-F/B control such that the exhaust A/F detected by the downstream A/F sensor is kept at a specific sub-F/B target A/F during hydrocarbon desorption from the HAEP catalyst.