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. 02, 2004
Filed:
Apr. 05, 2004
Hiroshi Hasegawa, Shizuoka-ken, JP;
Yuichiro Sawada, Shizuoka-ken, JP;
Yamaha Hatsudoki Kabushiki Kaisha, Shizuoka-ken, JP;
Abstract
An atmospheric pressure is obtained from an intake pressure resulting immediately before an intake stroke, an injection fuel pressure P is calculated which is constituted by a differential pressure between a fuel pressure which is supplied to an injector from the atmospheric pressure so obtained, a pump delivery pressure and the intake pressure and the intake pressure which is an injection atmosphere, a fuel injection time coefficient Q per unit mass which is metered when a reference injection fuel pressure is P is divided by a square root P of the injection fuel pressure to calculate a fuel injection coefficient Q , and a fuel injection time required to attain a desired air-fuel ratio is calculated using the fuel injection coefficient Q so calculated, whereby it is possible to realize a highly accurate control of the fuel injection time when a regulator for regulating an upper limit value for a fuel pump delivery pressure is provided on a fuel tank side.