Method and device for testing a fuel injector

US8646322B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Wolfgang Henner · Munich, DE
• Bertram Rensch · Barth, DE
• Christian Boie · Aachen, DE
• Gunter Freitag · Munich, DE
• Jochen Friedmann · Tauberbischofsheim, DE
• Joerg Staib · Wilmington, US
• Edgar Holl · Leverkusen, DE
• Daniel Strack · Uhingen, DE
• Dirk Freundt · Ditzingen, DE

Key dates

• Filing date: Jan 3, 2011
• Grant date: Feb 11, 2014
• Expiry date: Jan 3, 2031

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02D2250/04
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A method for selecting a procedure for determining the injection time of individual injection operations of a fuel injector, which may be supplied with pressurized fuel via a feed line, includes activating the fuel injector using various known activation durations in the vicinity of a predefined operating point of the fuel injector; detecting the pressure curve over time in the feed line for a number of injection operations; evaluating the detected pressure curves over time using at least two different procedures for determining the injection time from the particular pressure curve; determining the correlation between the determined injection times and the particular activation period; selecting the procedure with the highest correlation.