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:
Jul. 23, 1991
Filed:
Jul. 06, 1990
Ryoichi Kobayashi, Ibaraki, JP;
Noriyoshi Urushiwara, Katsuta, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
This specification discloses an electronic distribution type ignition system wherein at least two ignition coils are provided, and wherein the secondary voltage of the ignition coils is directly supplied to spark plugs. An ignition system according to this invention comprises switching circuits for controlling the supply of a primary voltage to said, ignition coils, a resistance element wherein a current flows selectively which corresponds to a primary current for each of two ignition coils, supplied through two of said switching circuit, current control circuits for detecting a terminal voltage of said resistance element and for controlling, according to said terminal voltage, the primary current flowing through each said igniton coil so as to be at a target value, and a board having said resistance element formed thereon.