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. 06, 2022
Filed:
Jan. 21, 2022
Toyota Jidosha Kabushiki Kaisha, Aichi-ken, JP;
Hitoki Sugimoto, Toyota, JP;
TOYOTA JIDOSHA KABUSHIKI KAISHA, Aichi-Ken, JP;
Abstract
A misfire detection device and method for an internal combustion engine are provided. A deactivating process deactivates combustion control for air-fuel mixture in a deactivated cylinder. An instantaneous speed variable indicates a speed in a case where a crankshaft rotates by a specific angle. The specific angle of the first instantaneous speed variable is a first angle. The specific angle of the second instantaneous speed variable is a second angle greater than the first angle. A second determining process determines whether a misfire has occurred from a magnitude of a rotation fluctuation amount of a subject of determination, instead of a relative magnitude of the rotation fluctuation amount of the subject of the determination relative to a reference rotation fluctuation amount, when the reference rotation fluctuation amount is a rotation fluctuation amount of the deactivated cylinder during the execution of the deactivating process.