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:
Apr. 25, 2000
Filed:
Sep. 17, 1997
Keiichiro Aoki, Susono, JP;
Yoichi Kurebayashi, Toyohashi, JP;
Toyota Jidosha Kabushiki Kaisha, Aichi-ken, JP;
Denso Corporation, Aichi-Pref., JP;
Abstract
A device for detecting knocking in an internal combustion engine capable of preventing accuracy for detecting knocking from being deteriorated by noise when resetting the LC resonance masking unit. An ionic current signal detected by an ionic current detecting unit is supplied to a buffer amplifier 5 via an LC resonance masking unit 31. To a first operational amplifier 51 of the buffer amplifier is connected a capacitor 513 for rejecting noise in parallel with a first feedback resistor 512. A second operational amplifier inverts again the ionic current signal inverted by the first operational amplifier. The buffer amplifier prevents a stepwise change on the input to the band-pass filtering unit when the masking of the LC resonance masking unit is reset, and suppresses a reduction in accuracy for detecting the knocking.