Method for detecting faulty components of an electronically regulated fuel injection system of an internal combustion engine

US9127632B2 · kind B2 · utility

Assignee

• CONTINENTAL AUTOMOTIVE GMBH · DE

Inventors

• Robert Hoffmann · Berlin, DE
• Steffen Lehner · Annaberg-Buchholz, DE
• Anselm Schwarte · Bad Abbach, DE
• Simon Ruscheinski · Rain, DE

Key dates

• Filing date: Feb 29, 2012
• Grant date: Sep 8, 2015
• Expiry date: Apr 26, 2032

Classification

• Technology area (CPC H): Electricity
• CPC primary: H02N2/065
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A method for detecting error-containing components of a piezo-injector in an internal combustion engine fuel-injection system is disclosed. The piezo-injector has a piezoelectric actuator and an injection needle driven thereby, and is configured for operation in a partial-stroke mode and a full-stroke mode. First, the internal combustion engine is brought to a defined operational point. Then, the time for the injector needle to strike its stop when said injector needle is opened, as well as the time for the injector needle to strike its needle seat again when said injector needle is closed, are measured. The measured times are compared to normal values determined at the test stand. Parameter(s) for the fuel-injection system are calculated, using different calculation models, and the results are stored. Finally, the calculated parameters of the different calculation models are compared to norm values determined at the test stand, and compared to one another.