Filling level measuring device for liquid in tank, particularly for aqueous urea solution in reducing agent tank of reducing agent system of motor vehicle, has ultrasonic sensor arranged at tank bottom

摘要

The filling level measuring device has an ultrasonic sensor (130) arranged at a tank bottom (101). The ultrasonic sensor is provided for contact-free filling level measuring by ultrasonic signals. The ultrasonic sensor is made up of a plastic. Independent claims are included for the following: (1) a method for determining filling level of a liquid filled in a tank, particularly for determining the filling level of an urea water solution in a reducing agent tank of a reducing agent system of an internal-combustion engine; and (2) a computer program with program code.