Method for operating a direct injection diesel engine

US7207311B2 · kind B2 · utility

Assignee

• AVL LIST GMBH · AT

Inventors

• Franz Chmela · Graz, AT
• Janos Csato · Graz, AT
• Michael Glensvig · Graz, AT
• Theodor Sams · Graz, AT
• Helmut Eichlseder · Graz, AT
• Günter Figer · Graz, AT
• Christian Fuchs · Heilsbronn, DE
• Gerhard Pirker · Lenzburg, CH
• Andreas Wimmer · Graz, AT

Key dates

• Filing date: Oct 15, 2003
• Grant date: Apr 24, 2007
• Expiry date: May 16, 2024

Classification

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

Abstract

A method for operating a direct injection diesel engine which is operated in a first operating region corresponding to low to medium partial load in such a way that fuel combustion takes place at a local temperature below the temperature of NOx formation and with a local air ratio above the limit value for soot formation, and where fuel injection starts in a range of between 50° to 5° crank angle before top dead center of the compression phase and where exhaust gas is recirculated at an exhaust gas recirculation rate of 50% to 70%. In order to achieve high efficiency in each operating region while keeping NOx and particulate emissions low, in a second operating region corresponding to medium partial load, fuel injection is started in a range from approximately 2° crank angle before top dead center to approximately 20° crank angle after top dead center.