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:
May. 19, 1987
Filed:
Apr. 10, 1986
Tatsuya Yoshida, Katsuta, JP;
Toshio Furuhashi, Mito, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
Disclosed is an ignition control apparatus for an internal combustion engine arranged to control an ignition timing and a current conduction initiating timing on the basis of a time elapsed from a point in time at which a reference position is reached by a crank shaft, in which a crank reference position detector is caused to generate a crank reference position signal which is reversed in polarity at a crank reference position of each cylinder of the engine as well as at an intermediate position between a preceding and a succeeding timing at the crank shaft reference position, and a leading edge and a trailing edge of the crank reference position signal are detected so as to determine each of the detection of the revolutional speed of the engine, the ignition timing, and the period of current conduction on the basis of a time elapsed from the detected leading edge or the trailing edge. Thus, it is possible to perform the ignition control accurately by using only one sensor synchronized with the revolution of said engine.