Device for controlling a cross-section of an opening in the combustion cylinder of an internal combustion engine

US6918361B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Udo Diehl · Stuttgart, DE
• Bernd Rosenau · Asperg, DE
• Simon Kieser · Sachsenheim, DE
• Uwe Hammer · Hemmingen, DE
• Volker Beuche · Stuttgart, DE
• Stefan Reimer · Markgröningen, DE
• Peter Lang · Gelnhausen, DE

Key dates

• Filing date: Nov 28, 2002
• Grant date: Jul 19, 2005
• Expiry date: Nov 28, 2022

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F01L2001/34446
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A device for controlling an opening cross section in the combustion cylinder of an internal combustion engine is provided, the device having a gas exchange valve integrated into the combustion cylinder and having an actuator which drives the valve element to execute a closing stroke and an opening stroke. A valve brake which is active during a residual closing stroke of the valve element is provided for the purpose of reducing the impact velocity of the valve closure member of the valve element on the valve seat in the closing stroke of the valve element. The valve brake has a hydraulic damping element with a fluid displacement volume which flows out through a throttle cross section of a throttle opening, and a control unit for controlling the throttle cross section as a function of the viscosity of the displacement volume.