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:
Apr. 11, 1995
Filed:
Oct. 05, 1993
Seiji Morino, Okazaki, JP;
Nippondenso Co., Ltd., Kariya, JP;
Abstract
An ignition system of an internal combustion engine for simultaneously exciting pairs of spark plugs, which system includes direct current circuits connecting in series primary windings of ignition coils having a coupling coefficient of higher than or equal to 0.9 and connected to spark plugs of engine cylinders working in pairs, one cylinder in a compression stroke while the other in an exhaust stroke, MOSFETs at one ends of the circuits, and an energy accumulating portion including a capacitor and a wiring coil, wherein the MOSFET turns on at an exciting timing for the corresponding cylinder to excite the corresponding direct current circuit by excitation energy accumulated in the energy accumulating portion in order to produce sparks in paired spark plugs, resulting in reliable firing of air/fuel mixture in engine cylinders in compression stroke in a short period and small energy of current in the windings.