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. 27, 1993
Filed:
Aug. 23, 1991
Atsuko Hashimoto, Himeji, JP;
Toshio Iwata, Himeji, JP;
Yasuhiko Hosoya, Himeji, JP;
Atsushi Ueda, Himeji, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A knock suppressing apparatus for an internal combustion engine includes an amplifier that amplifies the output signal of a knock sensor for sensing engine vibrations. A vibration level signal and a threshold signal are generated based on the amplifier output signals, and knocking is detected by comparing the vibration level signal and the threshold signal. The gain of the amplifier is varied in accordance with an operating condition indicative of the noise level of the engine so as to maintain the vibration level signal and the threshold signal within prescribed ranges suitable for knock determination. In one form of the invention, when the amplifier gain is varied, the threshold signal is also varied at substantially the same time and by substantially the same percentage as the amplifier gain.