Pump device for a fuel vapor retention system of an internal combustion engine

US5765538A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Erwin Krimmer · Plüderhausen, DE
• Helmut Denz · Stuttgart, DE
• Wolfgang Schulz · Wunstorf, DE
• Ernst Wild · Oberriexingen, DE
• Winfried Kuhnt · Stuttgart, DE
• Helmut Schwegler · Pleidelsheim, DE
• Andreas Blumenstock · Ludwigsburg, DE
• Tilman Miehle · Weingarten, DE
• Manfred Zimmermann · Bad Rappenau, DE

Key dates

• Filing date: May 15, 1997
• Grant date: Jun 16, 1998
• Expiry date: May 15, 2017

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B23P2700/13
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

A pump device for performing a leak diagnosis of a fuel vapor retention system. The pump device is provided for a fuel vapor retention system of an internal combustion engine, having a pump membrane driven by an electromagnet and a magnetic armature, which membrane defines a supply chamber that has valve devices, wherein a first valve can be connected to ambient air via a delivery line and can be connected via a second valve to a feed pipe that has an adsorption filter, and having a stop valve between the delivery line and the feed pipe, which valve is embodied so that it can be electromagnetically actuated. The pump device according to the invention is provided for a fuel vapor retention system of an internal combustion engine.