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. 06, 2007
Filed:
Apr. 22, 2004
Takashi Iwamoto, Tokyo, JP;
Jun Mitsuishi, Hyogo, JP;
Kimihiko Tanaya, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A knocking detection apparatus including: spark plugs disposed in cylinders of an internal combustion engine; an ion current detector for detecting ion currents flowing in the spark plugs; a time-frequency transformer for setting time intervals allowing one or more overlaps within a time from after ignition by the spark plugs to until the spark plug in the respective cylinder or in another cylinder next ignites and sampling ion currents in the respective time intervals to determine the time-frequency components of the ion current; a knocking detector for detecting knocking based on the time-frequency components; and a detection controller for inputting running status and controlling the time-frequency transformer and the knocking detector.