Method for metering a reducing agent into NO.sub.x -containing exhaust gas of an internal combustion engine

A method for metering a reducing agent into a NO.sub.x -containing exhaust gas of an internal combustion engine before the exhaust gas enters a catalytic converter of the internal combustion engine, wherein the catalytic converter has at least NO.sub.x reducing activity, a minimal heat capacity, and a minimal storage capacity for a reducing agent, said method comprising the steps of:

• a) determining engine-specific data for exhaust gas volume with a reference engine;
• b) determining NO.sub.x concentration during operation of the internal combustion engine based on data provided by a sensor arranged in the exhaust gas stream upstream of the catalytic converter;
• c) measuring an actual exhaust gas temperature of the internal combustion engine during operation;
• d) calculating a reducing agent amount based on the engine-specific data, the NO.sub.x concentration, and at least the actual exhaust gas temperature;
• e) detecting load-specific parameter changes of the internal combustion engine during operation;
• f) performing a dynamic correction of the reducing agent amount of step d) based on the load-specific parameter changes;
• g) supplying the corrected reducing agent amount of step f) to the exhaust gas stream.