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:
Oct. 09, 2001
Filed:
May. 23, 2000
Hiromi Kono, Higashimatsuyama, JP;
Zexel Corporation, Tokyo, JP;
Abstract
In order to obtain an amount of fuel injection determined by a target fuel injection amount determining unit (,) from an injector (,) supplied with high-pressure fuel from a high-pressure pump (,), there is provided a reference injection period determining unit (,) responsive to a target fuel amount signal (Qt) for determining a reference injection period (Tr) and a correction amount calculating unit (,) responsive to the reference injection period (Tr) and the rotational speed (R) of a high-pressure pump (,) for calculating a correction amount (F) for correcting the error caused by decrease in fuel pressure during the period of fuel injection, whereby an actual injection period (Ta) is determined by correcting the reference injection period (Tr) by the correction value (F). As a result, the injection pulse width can be controlled so as to precisely supply the desired amount of fuel from the injector (,).