Volkswagen Ag

Audi Ag

Aleksandar Tesic

Oliver Grunwald

Silke Weddig

Rene Fink

Stephan Wassmann

Georg Dieterle

Jacky Oelscher

Harm Pralle

Bjoern Froehlich

A method for operating a fuel tank arrangement for a motor vehicle. The fuel tank arrangement has a fuel tank, a hydrocarbon filter and a pump. The fuel tank is fluidically connected via a tank shut-off valve to the hydrocarbon filter and the hydrocarbon filter is fluidically connected, on the one hand, via the pump to an external environment of the fuel tank arrangement and, on the other hand, via a purge valve to an intake tract of an internal combustion engine. A first leakage test mode is carried out when the pressure in the fuel tank is greater than a pressure threshold value, in which a shut-off valve arranged in terms of flow between the pump and the external environment is closed and the tank shut-off valve is opened.

Method for operating a fuel tank arrangement for a motor vehicle, and corresponding fuel tank arrangement

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.

Method for testing the function of a fuel tank system of an internal combustion engine

Growing community of inventors

Wolfsburg, Germany

Aleksandar Tesic