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:
Jul. 26, 2005
Filed:
Feb. 13, 2002
Ekkehard Pott, Gifhorn, DE;
Eric Bree, Wolfsburg, DE;
Kai Philipp, Lagesbüttel, DE;
Michael Zillmer, Sickte, DE;
Ekkehard Pott, Gifhorn, DE;
Eric Bree, Wolfsburg, DE;
Kai Philipp, Lagesbüttel, DE;
Michael Zillmer, Sickte, DE;
Volkswagen Aktiengesellschaft, Wolfsburg, DE;
Abstract
The invention relates to two methods for controlling a fuel metering of a direct-injection internal combustion engine () in a multiple injection operating mode according to which at least two fuel injections into a cylinder () are carried out during a compression cycle of the cylinder () of the internal combustion engine () by means of at least one injection valve (). The invention provides that a pressure (rail pressure, P), under which the fuel is stored in front of the injection valve (), is present in such a manner and/or injected fuel portions of the individual injections of a combustion cycle and/or a total fuel quantity, which is injected during a multiple injection, are varied in such a manner as to prevent a forthcoming valve opening time (Δt) of the injection valve () from falling below a preset valve opening time (Δt) during at least one injection of a combustion cycle. The inventive measures ensure, with simple means, a precise fuel metering in the multiple injection operating mode and thus enable an application of the multiple injection operating mode over wide operating ranges, particularly also in the low load operating mode and idle operating mode.