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:
Jan. 29, 1985
Filed:
Nov. 28, 1980
Noboru Sugiura, Katsuta, JP;
Terumi Okado, Katsuta, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An ignition retard angle control apparatus for an internal combustion engine is disclosed. This control system comprises a vibration sensor for detecting engine vibrations, a filter for discriminating part of the output of the sensor in a characteristic frequency range where a knock-induced vibration component appears remarkably when a knock is generated, an amplifier for amplifying the output signal of the filter, an averaging/amplifying device for macroscopically averaging and amplifying the output signal of the filter, a comparator for comparing the output of the amplifier with those of the averaging/amplifying device and producing an output signal when the former is larger than the latter, an engine rpm detector for detecting the engine speed, and a voltage signal generator circuit responsive to the output signals of the comparator and the engine rpm detector and having an output of an amplitude corresponding to the ignition advance angle determined in accordance with the engine rpm, the voltage signal generator circuit changing the amplitude of the output voltage thereof in a manner to retard the ignition advance angle by a predetermined amount in response to an output signal of the comparator.