Abstract: A procedure to operate a metering device of an exhaust gas emission control system of an internal combustion engine and a device to implement the procedure are proposed. At least one component in an exhaust gas emission control configuration of the exhaust gas emission control system requires at least in certain operating conditions a reagent substance, which the metering device provides, in which a connecting line is disposed. After the emergence of a metering demand signal a reagent substance rate-set point is established. The reagent substance rate-set point is either established immediately when the metering demand signal occurs and subsequently no longer changed until the connecting line is filled with the reagent substance; or the reagent substance rate-set point is only then established if the connecting line is filled with the reagent substance. An overdose of the reagent substance is avoided with the procedural approach according to the invention.

Abstract: The invention relates to an exhaust gas aftertreatment device for an internal combustion engine supercharged in two stages, having an oxidation catalyst, a particle filter, and a metering device for introducing a regeneration agent into an exhaust gas system, and to an associated method for exhaust gas aftertreatment. According to the invention, the metering device is arranged in the exhaust gas system between a high-pressure turbine and a low-pressure turbine which produce two-stage supercharging of the internal combustion engine.

Abstract: A method is provided for operating an internal combustion engine in whose exhaust-gas region an exhaust-gas treatment device is situated, and in which a reagent is introduced into the exhaust-gas region of the internal combustion engine. in addition, a device is provided for implementing the method. The reagent pressure occurring between a reagent safety valve and a reagent dosing valve, disposed directly in the exhaust-gas region is recorded during different states of the reagent safety valve and/or the reagent dosing valve and compared to at least one threshold value. If the threshold is exceeded, a fault signal is provided. This may offer high safety which may be of particular importance when fuel is used as reagent.

Abstract: A procedure to operate a metering device of an exhaust gas emission control system of an internal combustion engine and a device to implement the procedure are proposed. At least one component in an exhaust gas emission control configuration of the exhaust gas emission control system requires at least in certain operating conditions a reagent substance, which the metering device provides, in which a connecting line is disposed. After the emergence of a metering demand signal a reagent substance rate-set point is established. The reagent substance rate-set point is either established immediately when the metering demand signal occurs and subsequently no longer changed until the connecting line is filled with the reagent substance; or the reagent substance rate-set point is only then established if the connecting line is filled with the reagent substance. An overdose of the reagent substance is avoided with the procedural approach according to the invention.

Abstract: A method is provided for operating an internal combustion engine in whose exhaust-gas region an exhaust-gas treatment device is situated, and in which a reagent is introduced into the exhaust-gas region of the internal combustion engine. in addition, a device is provided for implementing the method. The reagent pressure occurring between a reagent safety valve and a reagent dosing valve, disposed directly in the exhaust-gas region is recorded during different states of the reagent safety valve and/or the reagent dosing valve and compared to at least one threshold value. If the threshold is exceeded, a fault signal is provided. This may offer high safety which may be of particular importance when fuel is used as reagent.