Determining a waste water filling level in a vehicle tank, measuring arrangement and waste water arrangement

Abstract

In a method for determining a filling level (F) of waste water () in a tank () of a vehicle (), wherein a respective flushing quantity (P) of waste water () is fed to the tank () by means of flushing processes, a binary filling signal (L-) (waste water () present or not) is determined at at least two measuring positions (-) at the tank () with known filling quantities (M-), the filling level (F) is determined as a sum of a basic filling quantity (B) and an inflow quantity (Z), wherein the basic filling quantity (B) is selected as zero or as the greatest filling quantities (M-) of active filling signals (L-) at a starting time (A), and the inflow quantity (Z) is determined as a sum of all the fed-in flushing quantities (P) from the starting time (A). A measuring arrangement () for determining the filling level (F) contains an evaluation module () with an interface () for the flushing signals (S), and at least two sensors (-) for the filling signals (L-), wherein the evaluation module () is designed to determine the filling level (F) according to the method according to the invention. A waste water arrangement () with the tank () and at least one flushing device () contains a measuring arrangement () according to the invention.