Tank-venting arrangement for a motor vehicle and method for checking the operability thereof

US5186153A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Ulrich Steinbrenner · Kohlhof, DE
• Helmut Denz · Stuttgart, DE
• Ernst Wild · Oberriexingen, DE

Key dates

• Filing date: Dec 2, 1991
• Grant date: Feb 16, 1993
• Expiry date: Dec 2, 2011

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/40
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A tank-venting arrangement for a motor vehicle includes a fuel tank KT having a HC (hydrocarbon)-sensor, an adsorption filter AF and a tank-venting valve TEV. If the HC-sensor annouces that fuel vapor above a pregiven concentration is present in the tank, then it is expected that a lambda correction in the lean direction is required when the tank-venting valve is opened. If such a correction is not determined, this shows that either the arrangement leaks or the tank-venting valve does not open correctly. For carrying out the mentioned testing method, this arrangement requires only a single additional sensor, namely, the HC-sensor mounted in the tank. The arrangement is therefore simpler than known arrangements and nonetheless permits carrying out a reliable method for checking the operability.