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

Proposed are a method for dosing quantity diagnosis of a reagent dosing system (10), in which the stiffness (S) is determined as a measure of the dosing accuracy of the reagent dosing (10), wherein the reagent dosing (10) with an excitation Pressure signal (AR) is applied and the resulting reaction pressure signal (PR) is evaluated, and an apparatus for carrying out the method. The procedure according to the invention is 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 amplitude (A) of the reaction pressure signal (AR) and / or the phase shift (dPh) between the excitation pressure signal (AR) and the reaction pressure signal (PR) to determine the stiffness (S) are detected, wherein the amplitude (A) proportional to the stiffness (S) and the phase shift ( dPh) is inversely proportional to the stiffness (S).