Abstract: A method and a device for operating a combustion engine which features an injection of a cooling fluid into a combustion chamber of the combustion engine, in which a knocking risk is determined during a current combustion in the combustion chamber, and an injection of the cooling fluid into the combustion chamber takes place when the knocking risk exceeds a threshold value.

Abstract: A method and a device for operating a combustion engine which features an injection of a cooling fluid into a combustion chamber of the combustion engine, in which a knocking risk is determined during a current combustion in the combustion chamber, and an injection of the cooling fluid into the combustion chamber takes place when the knocking risk exceeds a threshold value.

Abstract: A method and a device for controlling an internal combustion engine, in which a first quantity characterizing the flow resistance of a first component of the exhaust-gas treatment system is determined based on a first measured quantity and a volumetric-flow quantity, and the volumetric-flow quantity is determined based on a second quantity which characterizes the flow resistance of a second component of the exhaust system.

Abstract: A method and a calculating device are for modeling the temperature of a catalytic converter in the exhaust gas of an internal combustion engine. In this context, the heat input into the catalytic converter based on exothermic reactions is taken into consideration. The method provides that a first correcting quantity delta_T1 and a second correcting quantity delta_T2 are formed, which each take into consideration a heat input into the catalytic converter based on exothermic reactions in the catalytic converter, delta_T1 being formed as a function of the ratio of the first fuel mass, combusted in the internal combustion engine simultaneously with an air mass, to the air mass, and delta_T2 being formed as a function of a heat input that results from an exothermic reaction of a second fuel mass, which was metered in for the regeneration of the catalytic converter in addition to the fuel proportion of the fuel/air mixture combusted in the internal combustion engine.

Abstract: A method and a device for controlling an internal combustion engine, in which a first quantity characterizing the flow resistance of a first component of the exhaust-gas treatment system is determined based on a first measured quantity and a volumetric-flow quantity, and the volumetric-flow quantity is determined based on a second quantity which characterizes the flow resistance of a second component of the exhaust system.