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:
Jan. 17, 2012
Filed:
Feb. 19, 2009
Satoshi Masuda, Kariya, JP;
Hirohiko Yamada, Okazaki, JP;
Naoki Kokubo, Nukata-gun, JP;
Shuhei Oe, Kariya, JP;
Satoshi Masuda, Kariya, JP;
Hirohiko Yamada, Okazaki, JP;
Naoki Kokubo, Nukata-gun, JP;
Shuhei Oe, Kariya, JP;
DENSO Corporation, Kariya, JP;
Nippon Soken, Inc., Nishio, JP;
Abstract
An output signal of a knock sensor is converted by an A/D conversion part in a specified knock determination range. In a time-frequency analysis part, data of frequency, time, and vibration intensity are extracted at the same time from an output signal of the knock sensor and the time-varying patterns of vibration intensities in multiple frequency ranges are extracted. A knock determination part computes lengths (crank angle, or time period) from a starting point to a latest terminating point of the time-varying patterns of vibration intensity in at least two frequency ranges, which rise at a same time. The knock determination part executes a knock determination based on whether the lengths are greater than a knock determination threshold.