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:
Feb. 24, 1987
Filed:
Apr. 14, 1986
Michael G McDermott, Kokomo, IN (US);
General Motors Corporation, Detroit, MI (US);
Abstract
A knock control for a spark ignited, internal combustion engine including an AGC amplifier in which the amplified sensor signal is demodulated, processed and compared to a fixed reference level to generate a pulsed knock signal. An error signal is generated from the difference between the signal input to the comparator and a desired signal voltage level; and the error signal is integrated to create the AGC control signal. The integration rate is decreased during each knock indicating pulse of the pulsed knock signal output of the comparator to reduce the effect of knock on the AGC control voltage and thus stabilize the AGC control. In particular, the error signal is a current level signal; and the input to the integrator includes a series impedance with a bypassing switch controlled by the comparator output to force the input through the impedance only during knock indicating pulses.