Method and apparatus for venting a crankcase of an internal combustion engine

US7275527B2 · kind B2 · utility

Assignee

• Daimlerchrysler AG · US

Inventors

• Klaus Bruchner · Großenhain, DE
• Ralf Kaufmann · Walldürn, DE
• Rudolf Klein · Oberhausen, DE
• Mario Murwald · Weingarten, DE

Key dates

• Filing date: Jan 10, 2006
• Grant date: Oct 2, 2007
• Expiry date: Jan 10, 2026

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F01M13/022
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

In a method for venting a crankcase of an internal combustion engine, in which, in a first operating range under part-load, the crankcase is vented via a first venting line, which opens into an intake line of the internal combustion engine downstream of a throttle valve, and in a second operating range under full load engine operation, the crankcase is vented via a second venting line, which opens into the intake line upstream of the throttle valve, the first venting line includes a control valve and a central unit is provided which operates the control valve so as to control the flow of vent gases through the first venting line over a range including a complete flow interruption under engine overrun condition to prevent venting gases from reaching the engine exhaust system when the internal combustion engine is operating in an overrun mode.