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. 11, 2003
Filed:
Dec. 16, 2001
Thorsten Fritz, Gaggenau, DE;
Lutz Reuschenbach, Stuttgart, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
A method for checking the tightness of a tank-venting system of a vehicle wherein one introduces an overpressure or underpressure compared to the atmospheric pressure via a pressure source alternately into the tank-venting system and a reference leak of a defined size connected in parallel to the tank-venting system over a pregiven time interval and wherein one detects at least one operating characteristic variable of the pressure source when introducing the pressure into the tank-venting system (tank measurement) as well as when introducing the pressure into the reference leak (reference measurement) and wherein one compares the two measurements and, when there is a deviation of the tank measurement from the reference measurement by a pregivable value, one draws a conclusion as to a leak when there is a deviation of the tank measurement from the reference measurement by a pregivable value and the method is characterized in that one draws a conclusion as to the operability of the tank-venting valve of the tank-venting system from the time-dependent trace of the operating characteristic variable for the tank measurement.