Operation of a motor vehicle with an internal combustion engine after a cold start

Abstract

In a method for operating a motor vehicle with an internal combustion engine comprising an internal combustion engine and an exhaust system with at least one exhaust aftertreatment device, after a cold start of the internal combustion engine, during which the exhaust aftertreatment device has a temperature below a start-up temperature, the operation of the internal combustion engine is limited by an engine control unit with respect to the torque (M) available from the internal combustion engine, depending on the temperature of the exhaust aftertreatment device. Driving the motor vehicle is thereby prevented until a minimum limit (MG) of the available torque (M) is reached, the minimum limit (MG) being varied depending on the driving resistance of the motor vehicle.When determining the driving resistance to be overcome, the presence or absence of a trailer attached to the vehicle is taken into account. If a trailer is attached, the presence or absence of a trailer drive is also considered when determining the driving resistance to be overcome.

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