DEVICE AND METHOD FOR CHOOSING MAXIMUM REDUCING AGENT DOSAGE AT AN SCR SYSTEM FOR EXHAUST AFTERTREATMENT

摘要

The invention pertains to a method for the selection of maximum reducing agent dosage at an SCR system for exhaust purification, where evaporation of a dosed amount of reducing agent is required. The method comprises the step to: - select (s440) the said maximum reducing agent dosage based on an exhaust mass flow MF, an effective evaporation temperature (Tv; T1; T2) and a reducing agent temperature (Tu). The invention also pertains to a computer program product comprising program code (P) for a computer (200; 210) to implement a method according to the invention. The invention also pertains to a device for the selection of maximum reducing agent dosage at an SCR system and a motor vehicle which is equipped with this device.