Method of controlling tank venting in an internal combustion engine and apparatus therefor

US4705007A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Gunther Plapp · Echterdingen, DE
• Botho Zichner · Schwieberdingen, DE
• Rudiger Jautelat · Tamm, DE
• Rolf Kohler · Schwieberdingen, DE
• Alfred Kratt · Schwieberdingen, DE
• Hans-Martin Muller · Farmington Hills, US

Key dates

• Filing date: May 22, 1986
• Grant date: Nov 10, 1987
• Expiry date: May 22, 2006

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 method and apparatus for controlling tank venting in internal combustion engines, a regenerative flow of fuel is released from the activated charcoal container to the negative-pressure side of the intake tube of the engine and an adaptation in the computer area for the fuel metering quantity simultaneously is prohibited, or vice versa, an adaptation is authorized and a regenerative fuel flow is prohibited, by cyclical triggering, as a function of whether the throttle flap angle drops below, or exceeds, a predetermined threshold value. Parallel to this, a continuous activated charcoal filter regeneration is provided that comes into play at relatively large air throughputs, by means of a branch line leading into the air filter area upstream of the throttle flap; furthermore, if the throttle flap angle threshold value is exceeded, both the regenerative fuel flow via the tank venting valve and the adaptation in the computer area are authorized.