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:
Aug. 21, 2001
Filed:
Jul. 07, 1999
Akihiko Minato, Kanagawa, JP;
Isuzu Motors Limited, Tokyo, JP;
Abstract
A common-rail fuel-injection system is disclosed for finding controlled variables such as an initial quantity of fuel injected in accordance with a start-delay time and adjusting the controlled variables to their desired value to thereby help ensure the reliable control and also the compensation in scattering of the initial fuel-injection characteristics. When selecting an initial quantity of fuel injected as the controlled variable of the initial injection, a desired, initial quantity Qi,of fuel injected is found on a lookup map C in accordance with the engine operating conditions, and a pull-in voltage Vp or current Ip is found on a lookup map D in compliance with the desired, initial quantity Qi,of fuel injected. An initial quantity Qi of fuel injected is found on a data, having been obtained previously, in compliance with a start-delay time T spanning from a timing the injector is applied with an instruction to initiate the fuel injection till a timing of the start of an actual fuel injection. The pull-in voltage Vp or current Ip is compensated by the difference method, based on a deflection between the desired initial quantity Qi,and the initial quantity Qi of fuel injected so as to make the initial quantity Qi conform with the desired, initial quantity Qi,.