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:
Feb. 19, 2013
Filed:
Dec. 16, 2009
Toshinori Tsukamoto, Wako, JP;
Naoki Oie, Wako, JP;
Toshinori Tsukamoto, Wako, JP;
Naoki Oie, Wako, JP;
Honda Motor Co., Ltd., Tokyo, JP;
Abstract
An apparatus determines a cylinder deactivation state of an internal combustion engine capable of deactivating one or more cylinders among a plurality of cylinders in accordance with an instruction from a program-controlled electronic control unit (ECU). The apparatus includes detection means to output a signal corresponding to an intake air amount into the internal combustion engine. The ECU includes Fourier transformation means to perform Fourier transformation on the signal from the detection means at plural fundamental frequencies, and determines the cylinder deactivation state with spectrums obtained from the Fourier transformation means based on predetermined relationship between the spectrums of Fourier transformation at the plural fundamental frequencies and the cylinder deactivation state of the internal combustion engine. The ECU distinguishes a deactivated cylinder with a phase obtained from the Fourier transformation means.