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:
Dec. 27, 2022
Filed:
Sep. 13, 2021
Yamaha Hatsudoki Kabushiki Kaisha, Iwata, JP;
Denso Corporation, Kariya, JP;
Minoru Hotta, Aichi, JP;
Yoshihiko Nonogaki, Aichi, JP;
Kazuteru Iwamoto, Shizuoka, JP;
Hisatoshi Kinoshita, Shizuoka, JP;
Nobuyuki Kawashima, Shizuoka, JP;
YAMAHA HATSUDOKI KABUSHIKI KAISHA, Iwata, JP;
DENSO CORPORATION, Kariya, JP;
Abstract
A straddled vehicle engine unit including an internal combustion engine and a misfire detection device. The internal combustion engine has a crankshaft, and a crank angle signal output unit that periodically outputs a crank angle signal in accordance with rotation of the crankshaft. The internal combustion engine is configured to repeat at least two kinds of strokes on a cycle of every 720-degree rotation of the crankshaft. The misfire detection device includes a crankshaft rotation speed fluctuation physical quantity acquisition unit configured to acquire a physical quantity related to an amount of fluctuation in a rotation speed of the crankshaft in one kind of stroke, out of the at least two kinds of strokes, based on the crank angle signal from the crank angle signal output unit, and a misfire determination unit configured to perform a misfire determination in response to each acquisition of the crankshaft rotation speed fluctuation physical quantity.