Robert Boschgmbh

Thomas Herges

Roland Kurz

Florian Guenther

Andreas Posselt

Marko Lorenz

Andreas Gutscher

Joerg Koenig

Peter Klee

Johannes Hoegl

Thomas Wieczorek

Guido Schock

Jochen Knecht

A method for detecting a sticking tank vent valve in a motor vehicle, a temperature sensor being situated in a tank vent line between the tank vent valve and an inlet point into an intake manifold or into a turbocharger and sticking of the tank vent valve being detected when the absolute value of a correlation of a calculated tank ventilation mass flow and of a signal value of the temperature sensor violates a predefinable threshold value.

Method for detecting a sticking tank vent valve

A method and a corresponding system for detecting a malfunction in an electric drive unit. The method comprises the following steps: ascertain (S) a current flow characteristic () of an electric drive unit; detect (S) a gradient change in the current flow characteristic () at a first point in time (t=n); compare (S, S) the gradient change with a predefinable gradient change range; establish (S) a malfunction in the electric drive unit if the gradient change is outside the predefinable gradient change range.

Detection of bending effects in the case of electric drives

The invention relates to a system () and to a corresponding method for tank leakage diagnosis. The system () comprises a fuel tank (), a pressure source (), and a pressure sensor (). The pressure source () is configured to increase the pressure in the fuel tank (). The pressure sensor () is configured to detect the pressure progression at the fuel tank (). The system () is configured to seal the fuel tank () in a gas-tight manner such that the fuel tank () can be used as a pressure store. Furthermore, the system () is configured to conclude, independently of a current operation of the pressure source () based on the determined pressure progression at the fuel tank (), that a leak is present.

Tank leakage diagnosis having a fuel tank as a pressure store

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Eberdingen, Germany

Thomas Herges