Robert Boschgmbh

Johannes-Dieter Wichterich

Helmut Denz

Eberhard Schnaibel

Ernst Wild

Werner Mezger

Lothar Raff

Klaus Walter

Wilfried Burger

Eugen Joos

Bernd Diebold

Joachim Heimes

Frank Kohler

Drive-away blocking device

The invention is directed to a connecting circuit for a potential-free lambda probe having a ground line and a signal line and having an offset voltage source which is connected to the ground line. This offset voltage source raises the potential of the ground line to a pregiven value relative to ground. A ground short is directly detectable in the connecting circuit of the invention in that the potential measured at the signal line drops below the offset voltage. In this way, it is no longer required as in conventional circuits to check for a ground short by enriching the mixture of an engine and to monitor the exhaust gas with the lambda probe.

Connecting circuit for connecting a lambda probe to a control apparatus

Growing community of inventors

Muehlacker, Germany

Johannes-Dieter Wichterich