Method for dosing quantity diagnosis of a reagent dosing system, device for carrying out the method, control unit program and ECU program product

摘要

Method for dosing quantity diagnosis of a reagent dosing system (10), in which the rigidity (S) is determined as a measure of the dosing accuracy of the reagent dosing system (10), wherein the reagent dosing system (10) with an excitation pressure signal (AR ) is evaluated and the resulting reaction pressure signal (PR) is evaluated, characterized in that a periodic excitation pressure signal (AR) is provided, that the periodic excitation pressure signal (AR) has a constant, fixed predetermined frequency and that the phase shift (dPh) between the excitation pressure signal (AR) and a reaction pressure signal (PR) for determining the stiffness (S) are detected, wherein the phase shift (dPh) is inversely proportional to the stiffness (S).