DELIVERY UNIT WITH FILL LEVEL SENSOR FOR A LIQUID ADDITIVE, TANK FOR STORING LIQUID ADDITIVE, MOTOR VEHICLE AND METHOD FOR MONITORING A FILL LEVEL

摘要

A delivery unit for extracting liquid additive from a tank can be mounted on the tank and includes a fill level sensor for measuring the fill level of liquid additive in the tank. The fill level sensor is set up to emit waves into an emission region of the tank, and the fill level can be measured by using a propagation time measurement of the waves reflected by a liquid surface and striking the fill level sensor again. At least one first reference surface extends at least partially into the emission region and is at a first distance from the fill level sensor. The at least one first reference surface is disposed on a separate calibration component mounted on an outer side of a housing of the delivery unit. A tank for storing liquid additive, a motor vehicle and a method for monitoring a fill level are also provided.

主权项

1. A delivery unit configured to be mounted on a tank for extracting liquid additive from the tank, the delivery unit comprising:
a housing having an outer side; a separate calibration component mounted on said outer side of said housing; a fill level sensor configured to measure a fill level of liquid additive in the tank, said fill level sensor configured to emit waves into an emission region of the tank permitting the fill level to be measured by using a propagation time measurement of the waves being reflected by a liquid surface and striking said fill level sensor again; and at least one first reference surface disposed on said separate calibration component, extending at least partially into said emission region and being disposed at a first distance from said fill level sensor.