SCR METHOD FOR OPERATING OF A DOSING SYSTEM FOR SOLUTION OF REDUCING AGENT OF A SCR CATALYTIC CONVERTER IN THE EXHAUST GAS SYSTEM OF AN INTERNAL COMBUSTION ENGINE

摘要

The present invention relates to a method of operating a metering supply system for a reducing agent solution in an SCR catalytic converter (11) in an exhaust gas system (10) of an internal combustion engine, said metering supply system being connected to a coolant circuit And one or more coolable metering supply modules (20). The cooling of the metering supply module 20 is carried out by the demand of the cooling ability of the coolant circuit 30. [ In accordance with the present invention, the temperature of the coolant is taken into account when demanding cooling capability, and the temperature of the coolant is determined based on the model in the inflow region into the metering supply module 20. Within the model, one or more pieces of information about the temperature of the coolant remote from the metering supply module 20 and one or more pieces of information about the temperature in the area of the metering supply module 20 are introduced.