Method and device for diagnosing tank leaks using a reference measuring method

US6845652B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Volk r Stegmann · Bretten, DE
• Thorsten Fritz · Gaggenau, DE
• Martin Streib · Leinfelden, DE
• Peter Wiltsch · Riedlingen, DE
• Armin Hassdenteufel · Unterriexingen, DE

Key dates

• Filing date: Jun 24, 2002
• Grant date: Jan 25, 2005
• Expiry date: Jun 24, 2022

Classification

• Technology area (CPC G): Physics
• CPC primary: G01M3/3263
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

In a method and a device for leak testing of a vessel, e.g., a tank venting system of a motor vehicle, a leak-tightness measurement is performed by introducing a positive pressure or partial vacuum and detecting the variation over time of a positive pressure or partial vacuum in the vessel, and a reference measurement is performed using a reference leak. A conclusion is drawn as to the presence of a leak in the vessel by comparing the results of the leak-tightness measurement and the reference measurement. To avoid faulty diagnoses, the positive pressure or partial vacuum during the leak-tightness measurement and the reference measurement is detected by using a single pressure measuring device.