Apparatus and method for selecting maximum reductant dosing in an SCR system for exhaust aftertreatment

摘要

The present invention relates to a method for selecting a maximum reductant dosage in an SCR system for exhaust gas purification, in which a metered amount of reducing agent must be evaporated. The method comprises the following step: selecting (s440) said maximum reducing agent metering based on an exhaust gas mass flow rate MF, an effective evaporating temperature (Tv, T1, T2) and a reducing agent temperature (Tu). The invention also relates to a computer program product comprising a program code (P) for a computer (200, 210) in order to implement a method according to the invention. Furthermore, the invention relates to a device for selecting a maximum Reduktionsmitteldosierung in an SCR system and a motor vehicle, which is equipped with this device.