The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 01, 2005
Filed:
Mar. 27, 2002
Wolfgang Schulz, Bietigheim-Bissingen, DE;
Martin Maier, Moeglingen, DE;
Manfred Zimmermann, Bad Rappenau, DE;
Wolfgang Schulz, Bietigheim-Bissingen, DE;
Martin Maier, Moeglingen, DE;
Manfred Zimmermann, Bad Rappenau, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
In a method and an arrangement for checking the tightness of a vessel (), especially of a tank-venting system of a motor vehicle, the vessel () is charged with a pressure generated by a motor-driven pressure source () and the motor current is determined. A reference leak () is selectively driven by a switchover valve () and is charged with a corresponding pressure and the motor current is determined. The determined electrical characteristic quantity and the determined reference characteristic quantity are compared and a conclusion is drawn therefrom as to the presence of a leak. To prevent the entry of moisture into the pressure source (), it is provided that at least the pressure source () is heated intermittently. The heating takes place preferably by driving the switchover valve () at a suitable pulse duty factor. To prevent the entrance of moisture into the pressure source (), a check valve () is provided and is suitably mounted in the connecting part of the pressure source ().