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:
Sep. 21, 1999
Filed:
Sep. 04, 1997
Keiichiro Aoki, Susono, JP;
Yoichi Kurebayashi, Toyohashi, JP;
Toyota Jidosha Kabushiki Kaisha, Aichi-Ken, JP;
Abstract
A device for a detecting a combustion state in an internal combustion engine, capable of preventing the background from increasing while the fuel is being cut. A peak value of ionic current detected by the ionic current detecting unit 19 is supplied to an ignition timing control unit 14 via an LC resonance masking unit 31, a band-pass filter unit 32 and a peak-holding unit 33. An average of peak values is used as a background, and it is so determined that knocking has occurred when the peak value becomes larger than the product of a predetermined coefficient and the background (BG). Impulse noise (IM) easily occurs while the fuel is being cut. In order to prevent BG from being increased by IM, therefore, a limiting means is provided to limit BG to a value calculated before the fuel was cut, so that the detecting precision will not be deteriorated after the fuel-cut is terminated.