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:
Jan. 31, 1989
Filed:
Apr. 05, 1988
Hidekazu Oshizawa, Higashimatsuyama, JP;
Masataka Ishikawa, Higashimatsuyama, JP;
501 Diesel Kiki Co., Ltd., Tokyo, JP;
Abstract
In a fuel injection system for an engine, a first controller calculates circuit rotational angle of a crankshaft on the basis of reference pulses and scale pulses from a detector for detecting rotation of the crankshaft. The first controller outputs a drive pulse representative of a closing command moving an electromagnetic valve to a closed position, at a timing with reference to the current rotational angle, to control a period, within which the valve is in the closed position, during forward stroke of a plunger. A second controller intermittently outputs drive pulses representative of the closing command, at an initial stage of engine start-up, independently of the crankshaft rotational angle. A time duration of each drive pulse from the second controller is shorter than a time duration required for the plunger forward stroke, and a period within which each drive pulse is not outputted from the second controller is also shorter than the time duration required for the plunger forward stroke.