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. 12, 1985
Filed:
Sep. 15, 1982
Applicant:
Inventors:
Suetaro Shibukawa, Katsuta, JP;
Hiroshi Katada, Katsuta, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F02P / ;
U.S. Cl.
CPC ...
123418 ; 123415 ;
Abstract
An ignition timing control circuit for internal combustion engine comprising a pulse generator which provides a pair of pulses in synchronization with the crank shaft rotation, a pair of polygonal wave generators for providing two types of polygonal waves, one having a constant amplitude, the other having a peak level which varies depending on the engine speed, and a comparator which detects the point of time at which the two waves have the same level and provides an ignition signal at this point, whereby the timing of ignition can be varied automatically, based on the engine speed.