Bayerische Motoren Werke Aktiengesellschaft

B Ayerische M Otoren W Erke a Ktiengesellschaft

Stefan Uhl

Gerd Kraemer

Till Scheffler

Georg Meder

Wolf Kiefer

Johann Hofmann

Gerhard Schulz

The invention relates to a method for automatically switching off an internal combustion engine in a motor vehicle, in particular in a motor vehicle having an automatic transmission, by means of a stop/start device, which initiates measures for automatically switching off the internal combustion engine if the vehicle has been braked to a stop and advantageously held at a stop by actuation of the brake pedal for a predefined time interval. The invention is characterized in that the rotation speed of the internal combustion engine is changed, in particular reduced, at a defined point in time before the measures for automatically switching off the internal combustion engine are initiated.

Method for automatically switching off an internal combustion engine

The diagnosis of the heating of a catalytic converter situated in an exhaust system of an internal combustion engine is described. The system includes monitoring the actual ignition angle intervention. A current ignition angle is acquired over a specified time and converted into a torque model used for catalytic converter heating. Using the torque model, a degree of fulfillment of executed catalytic converter heating measures is obtained and an error signal is generated by comparing the obtained degree of fulfillment to a limiting value.

Method for monitoring the functionality of the heating of a catalytic converter situated in an exhaust system of an internal combustion engine

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Munich, Georgia

Stefan Uhl