Method and device for zero-fuel quantity calibration of a fuel injector

US9109561B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Michael Walter · Kornwestheim, DE
• Joachim Palmer · Ditzingen, DE
• Andreas Rupp · Erbach, DE
• Stefan Bollinger · Marbach am Neckar, DE

Key dates

• Filing date: Dec 3, 2012
• Grant date: Aug 18, 2015
• Expiry date: Dec 3, 2032

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/40
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

In a method for calibrating a fuel metering system including an injector of an internal combustion engine performing a pilot injection chronologically prior to a main injection, at least two test injections chronologically prior to the pilot injection are provided for the injector, the first test injection being carried out using a first activation duration, in which the injector does not yet open, at least one second test injection being carried out in a subsequent injection cycle using an activation duration which is progressively increased in each case in relation to the first test injection until a change of an operating variable of the fuel metering system or the internal combustion engine results, which activation duration corresponds to a minimum activation duration of the injector.