Ultrasound sensor

1. A method for producing an ultrasound sensor to detect the filling level and/or the temperature of a fluid in an internal combustion engine, the method comprising:

arranging an electronics system of the ultrasound sensor in an injection molding die;

encapsulating the electronics system by injection molding with a thermoplastic material and thereby forming a housing for the electronics system; and

removing the encapsulated electronics system from the injection molding die;

wherein the housing includes a functional section to fulfill a predetermined function.

2. The method as claimed in claim 1 , wherein the thermoplastic material is resistant to the fluid.

3. The method as claimed in claim 1 , wherein:

the functional section includes a seal recess arranged on an outer side of the housing; and

the seal recess is configured to receive a seal.

4. The method as claimed in claim 1 , wherein the fastening region comprises a projection configured to support a sound carrying tube.

5. The method as claimed in claim 1 , wherein the functional section includes a sensor recess configured to receive a sensor.

6. The method as claimed in claim 1 , wherein the electronics system comprises:

a carrier element;

a piezo element fitted to the carrier element; and

an integrated circuit fitted to the carrier element.

7. An ultrasound sensor for detecting the filling level and/or the temperature of a fluid in an internal combustion engine, the sensor comprising:

an electronics system; and

a housing surrounding the electronics system;

wherein the housing comprises an injection molded thermoplastic material;

the housing includes a functional section configured to fulfill a predetermined function.

8. The ultrasound sensor as claimed in claim 7 , wherein the functional section comprises a seal recess arranged on an outer side of the housing to receive at least one seal.

9. The ultrasound sensor as claimed in claim 7 , wherein the functional section comprises a sensor.