Diagnostic module for testing the tightness of a container

US6182502A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Helmut Schwegler · Pleidelsheim, DE
• Manfred Zimmermann · Bad Rappenau, DE

Key dates

• Filing date: Feb 22, 1999
• Grant date: Feb 6, 2001
• Expiry date: Feb 22, 2019

Classification

• Technology area (CPC G): Physics
• CPC primary: G01M3/007
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

In a diagnosis module for leak testing a container of a tank ventilation system of a motor vehicle, which has a reference leak through which a volume flows and is matched to a permissible leakage of the container. The reference leak is constituted by a number of diaphragms disposed in series in the flow direction, in which each of the diaphragms have a throttle opening (25 27). The advantage of this diagnosis module lies in the large diameter throttle openings, which are less susceptible to malfunction when there is a permitted leakage hole that has a significantly smaller diameter.