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. 16, 2002
Filed:
Aug. 22, 2000
Noriaki Kondo, Aichi, JP;
Yasushi Sakakura, Aichi, JP;
NGK Spark Plug Co., Ltd., Aichi, JP;
Abstract
A method of controlling a direct fuel injection engine is provided. In the method, under a condition where an ignition timing which is accurately detectable is constant, a fuel injection timing is advanced and delayed to measure an average ion current, and the fuel injection timing is controlled so as to maximize the average ion current. Even when the efficiency of a solenoid is lowered to cause a variation of the fuel injection timing, the fuel injection timing can be controlled to be optimized, thus making it possible to maintain an intended efficiency of the direct fuel injection engine over a long period of usage. Particularly, the method can be realized by the use of a conventional ion current detecting device for detection of a misfire, it can be executed with an apparatus which can be attained at low cost. A direct fuel injection engine control system and a storage medium storing the control method of this invention are also provided.