A method for operating a metering system for the reducing agent solution of an SCR catalyst device in the exhaust line of an internal combustion engine

摘要

In a method for operating a metering system for the reducing agent solution of an SCR catalytic converter device (11) in the exhaust line (10) of an internal combustion engine, the metering system comprises at least one coolable metering module (20) which is connected to a coolant circuit (30). Cooling of the metering module (20) takes place by requesting a cooling capacity of the coolant circuit (30). According to the invention, the temperature of the coolant is taken into account when requesting a cooling power, wherein the temperature of the coolant in the region of entry into the metering module (20) is determined on the basis of a model. At least information about the temperature of the coolant remote from the metering module (20) and at least information about the temperature in the area of the metering module (20) flow into the model.