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:
Oct. 24, 1978
Filed:
Feb. 07, 1977
Takashi Hasegawa, Kariya, JP;
Nippondenso Co., Ltd., Kariya, JP;
Abstract
An electric ignition advance system for internal combustion engines wherein an ignition timing to be advanced in accordance with a scheduled pattern is determined digitally. Advance pattern voltage generators generate voltage signals depending on engine operation parameters such as engine rotational speed or engine intake vacuum and hence the voltage signals represent scheduled advance pattern voltages. The voltage signal, i.e., the advance pattern voltages are combined and the resultant signal is converted into a frequency signal. The frequency signal is counted by a digital ignition timing determination circuit with respect to a reference ignition signal supplied from, e.g. a distributor. When the digital ignition timing determination circuit counts a predetermined number of the frequency signals, it provides an ignition signal.