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:
Mar. 10, 2015
Filed:
May. 04, 2011
Steffen Lehner, Eichstätt, DE;
Manfred Kramel, Mintraching, DE;
Hans-jörg Wiehoff, Regensburg, DE;
Nicolas Nozeran, Tegernheim, DE;
Peter Matthias Ruβe, Tegernheim, DE;
Steffen Lehner, Eichstätt, DE;
Manfred Kramel, Mintraching, DE;
Hans-Jörg Wiehoff, Regensburg, DE;
Nicolas Nozeran, Tegernheim, DE;
Peter Matthias Ruβe, Tegernheim, DE;
Continental Automotive GmbH, Hannover, DE;
Abstract
A method for determining the actual start of injection is performed by an actuating device for a piezo fuel injection valve and includes the following steps. First, a test injection is carried out with such a short actuation duration that a start of shut-off takes place at a time so early that the nozzle needle does not reach the open end position. Said time is predefined by the actuation and is therefore precisely known. Next, the closing time of the nozzle needle is then determined by measurement and evaluation of an electrical variable of the piezo direct drive. Once the closing time and the time of the start of shut-off are known, the actual start of injection is calculated back from the closing time via the start of shut-off. This permits an adequately precise determination of the actual injection quantity in almost every operating state of the internal combustion engine.