Direct injection spark ignition engine

US6748917B1 · kind B1 · utility

Assignee

• Daimlerchrysler AG · US

Inventors

• Michael Hoffmann · Gablingen, DE
• Uwe Kreckel · Unterensingen, DE

Key dates

• Filing date: May 10, 2002
• Grant date: Jun 15, 2004
• Expiry date: May 10, 2022

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/12
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

In internal combustion engines having direct injection, an injector injects fuel into the combustion chamber to form an ignitable fuel/air mixture with combustion air supplied separately, the mixture being ignitable by a spark plug. The fuel is injected in a conical pattern, and the electrodes are protected from wetting by fuel and from coking if they are located outside the lateral surface of the fuel cone produced by the injection nozzle. To introduce an ignitable mixture between the electrodes and to ensure optimum operating performance of the internal combustion engine by improving the combustion process, a combustion chamber is configured so that the fuel cone is injected in a free jet which is substantially completely unaffected by the combustion chamber perimeter, and the electrodes of the spark plug project into a fuel vortex emerging from the lateral surface during injection. Electrodes are provided at different spark positions relative to the lateral surface to which the positive potential of the ignition voltage may be applied alternately for ignition of the fuel vortices as a function of the operating point of the internal combustion engine.