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:
Jun. 26, 2001
Filed:
Aug. 11, 1999
Thorsten Fritz, Gaggenau, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
The invention is directed to a method for checking the operability of a tank-venting system of a vehicle. A pressure source is operatively connected to the tank-venting system and a first fill level of the tank is determined and stored at the start of a standstill of the vehicle. An overpressure relative to atmospheric pressure is introduced into the tank-venting system during the standstill of the vehicle and an operating characteristic variable of this pressure source is detected as the overpressure is introduced into the tank-venting system. A conclusion as to the presence of a leak in the tank-venting system is drawn from the operating characteristic variable. A second fill level of the tank at the end of the standstill is determined and stored. The difference of the first and second fill levels is formed and a determination is made as to whether the difference exceeds a pregiven threshold value; and, only if the threshold value is exceeded, a fault announcement is outputted.