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:
Mar. 25, 2025
Filed:
Dec. 19, 2023
Yamaha Hatsudoki Kabushiki Kaisha, Iwata, JP;
Kenichi Kumagai, Shizuoka, JP;
Yuta Shimizu, Shizuoka, JP;
YAMAHA HATSUDOKI KABUSHIKI KAISHA, Iwata, JP;
Abstract
A catalyst deterioration diagnosis device, including: a processor to execute, when a cycle of reversal between increasing and decreasing of a fuel amount is disturbed such that the increasing/decreasing of the fuel amount is reversed three or more times in a period that is identical in length with a period in which the increasing/decreasing of the fuel amount is reversed twice when the reversal between increasing and decreasing of the fuel amount is normal, a process of diagnosing the deterioration state of a catalyst based on plural sets of data of the output signal of a downstream oxygen concentration sensor obtained in each unit period during a diagnosis period. The sets of data obtained in each unit period during the diagnosis period is not susceptible to an influence of variations including both increase and decrease of the output signal of the downstream oxygen concentration sensor.