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. 14, 2025
Filed:
Mar. 24, 2022
Nissan Motor Co., Ltd., Yokohama, JP;
Tomohiro Sakata, Kanagawa, JP;
Seiji Hashimoto, Kanagawa, JP;
NISSAN MOTOR CO., LTD., Yokohama, JP;
Abstract
In response to an engine temporary stop request, a quantity of oxygen stored in a catalytic converter is reduced by controlling an in-cylinder air fuel ratio to be richer than stoichiometric. The quantity of stored oxygen is calculated while the engine is operating. An amount of air fuel ratio enrichment is set based on the quantity of stored oxygen calculated when the stop request occurs, such that the amount of air fuel ratio enrichment decreases as the quantity of stored oxygen decreases. An opening of a throttle valve is reduced in response to the stop request. Engine stop is permitted when the reduction of the opening of the throttle valve causes an internal pressure of an intake passage downstream of the throttle valve to reach a predetermined negative pressure, and the air fuel ratio enrichment operation causes the quantity of stored oxygen to reach a predetermined target value.