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:
May. 24, 1983
Filed:
Aug. 24, 1981
Herman F Brandt, Birmingham, MI (US);
General Motors Corporation, Detroit, MI (US);
Abstract
A spark ignited internal combustion engine includes apparatus effective to generate a signal from knock-induced and other ringing vibration bursts with amplification over a wide passband around the characteristic knock frequency. The signal is demodulated to obtain the envelope pulses of the knock and other vibration bursts and filtered in a low pass filter having a half power frequency from 60-200 Hertz. The output of this filter, in which other pulses are significantly attenuated with respect to knock pulses, is further processed to obtain a knock control signal which controls spark retard apparatus to limit knock intensity.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile