Dosing device operating method for truck, involves regulatedly bringing reagent unit into exhaust gas flow of internal combustion engine, and computing reagent unit pressure and performing plausibility check based on pressure model

摘要

The method involves regulatedly bringing a reagent unit into an exhaust gas flow of an internal-combustion engine under consideration of a reagent unit pressure. The reagent unit pressure is computed and/or plausibility check is performed based on a pressure model that is based on a balance calculation of an inlet (115) and a discharge (120) at the reagent unit in a hydraulic system. The pressure model is calibrated based on an electrical load current of a feed pump that is arranged in the hydraulic system.