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:
Nov. 26, 1991
Filed:
Oct. 17, 1990
Toshio Iwata, Himeji, JP;
Toshio Ohsawa, Himeji, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A control device for a multi-cylinder engine comprises, in addition to a sensor 11 for detecting reference rotational positions of the crank shaft 1, an ionization current detector 41 for detecting the ionization current across a spark plug 33 of a cylinder. From the output of the sensor 11, the microcomputer 40 discriminates the group of cylinders which are in the compression and the exhaust stroke. For a short period after the start of the engine, the group of cylinders in the compression and the exhaust stroke are ignited simultaneously. During this short period, the cylinder in the compression stroke is discriminated from the group of cylinders in the compression and the exhaust stroke, on the basis of the output of the ionization current detector 41, and the number of succesive discriminations of the cylinder in the compression stroke is counted. When this number reaches a predetermined number n, a flag F is set, such that only the cylinder in the compression stroke is supplied with the ignition current thereafter.