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:
Jan. 03, 2023
Filed:
Mar. 14, 2022
Volkswagen Aktiengesellschaft, Wolfsburg, DE;
Rene Fink, Wismar, DE;
Stephan Wassmann, Isenbuettel, DE;
Jacky Oelscher, Arendsee OT Hoewisch, DE;
Harm Pralle, Braunschweig, DE;
Bjoern Froehlich, Gifhorn, DE;
Silke Weddig, Braunschweig, DE;
Georg Dieterle, Taufkirchen, DE;
Aleksandar Tesic, Wolfsburg, DE;
Volkswagen Aktiengesellschaft, Wolfsburg, DE;
Abstract
A method for testing the function of a fuel tank system of an internal combustion engine, the fuel tank system, whereby a gas transport device is operated and a shutoff valve is actuated by means of PWM, whereby the shutoff valve is opened and closed multiple times according to a PWM signal for implementing a defined opening state, a pressure oscillation of the purge gas, which results due to the corresponding opening and closing movements of the shutoff valve, being ascertained and evaluated with the aid of the pressure sensor according to a frequency diagnosis, and a distinction being made between an operability and a malfunction, based on the result of the evaluation.