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:
Mar. 24, 1987
Filed:
Apr. 14, 1986
Michael G McDermott, Kokomo, IN (US);
Larry L Nix, Kokomo, IN (US);
General Motors Corporation, Detroit, MI (US);
Abstract
An adaptive knock control for a spark ignited, internal combustion engine is disclosed in which a signal representing sensed knock induced and other bursts of engine vibrations is demodulated to generate pulses corresponding to the envelopes of such knock induced and other burst of engine vibrations. Discrimination apparatus responsive to pulses duration compares each to a discrimination reference and selectively discriminates in favor of those having a longer duration characteristic of knock induced bursts. The discrimination apparatus is responsive to engine speed to vary the discrimination reference therewith in the direction of shorter time durations with increased engine speed and longer time durations with slower engine speed. If the discrimination apparatus is a low pass filter, its corner frequency is varied directly with engine speed. If the discrimination apparatus is an ignore timer, the ignore time is varied inversely with engine speed. The apparatus may include an add timer following the ignore timer, the add time of which is also varied inversely with engine speed.