Volkswagen Ag

Stephan Wassmann

Silke Weddig

Rene Fink

Mathias Hauptvogel

Aleksandar Tesic

Jacky Oelscher

Harm Pralle

Bjoern Froehlich

Georg Dieterle

A method for diagnosing a crankcase system of an internal combustion engine. A pressure value is captured in a crankcase system. A pressure value of a reference pressure is ascertained or a pressure value to be expected in the crankcase system is modeled. A gradient of the pressure value in the crankcase system and a gradient of the reference pressure or the modeled pressure in the crankcase system is formed. The two formed gradients are integrated over time. The function of the crankcase system is evaluated based on the values obtained by the integrations. A control device as well as an internal combustion engine for carrying out the method are provided.

Method for diagnosing a crankcase system of an internal combustion engine, and internal combustion engine

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

Isenbuettel, Germany

Stephan Wassmann