Direct injection, spark ignition internal combustion engine

US6575132B1 · kind B1 · utility

Assignee

• Daimlerchrysler AG · US

Inventors

• Johannes Ernst · Baden-Baden, DE
• Benedikt Ganz · Durmersheim, DE
• Rolf Klenk · Stuttgart, DE
• Klaus Rössler · Altbach, DE

Key dates

• Filing date: Jan 28, 2002
• Grant date: Jun 10, 2003
• Expiry date: Jan 28, 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 a direct injection internal combustion engine with a combustion chamber which is delimited in each cylinder by a longitudinally movable piston and by the inner wall of a cylinder head, an injector injects fuel into the combustion chamber in order to form an ignitable fuel/air mixture with combustion air that is supplied separately, the mixture being ignited by a spark plug. The fuel is injected in a conical shape and the electrodes are protected from being wetted by fuel and from coking if they are located outside the lateral surface of the cone of fuel produced by the injection nozzle. In order to bring an ignitable mixture between the electrodes and to ensure an optimal operating performance of the internal combustion engine by improving the combustion process, the combustion chamber is configured so that the cone of fuel is injected in a free jet that is substantially unaffected by the perimeter of the combustion chamber, and the electrodes of the spark plug project inside a fuel vortex which emerges from the lateral surface during injection.