Air sensor system

Patent metadata

Field	Value
Publication number	US-10551402-B2
Application number	US-201715628048-A
Country	US
Kind code	B2
Filing date	Jun 20, 2017
Priority date	Jun 22, 2016
Publication date	Feb 4, 2020
Grant date	Feb 4, 2020

Abstract

An air sensor system including a pressure or airflow sensor, a filter housing that defines an air flow path to the air pressure sensor, and a filter in the air flow path. The filter includes a micro filter and a hydrophobic membrane. The hydrophobic membrane is downstream of the micro filter in the air flow path to the pressure or airflow sensor.

First claim

The invention claimed is:

1. An air sensor system comprising:
a pressure or airflow sensor;
a filter housing that defines an air flow path to the air pressure sensor; and
a filter in the air flow path, the filter comprising;
a micro filter; and
a hydrophobic membrane downstream of the micro filter in the air flow path to the pressure or airflow sensor;
wherein the micro filter and the hydrophobic membrane are physically adjacent to each other.

2. The air sensor system of claim 1 , wherein the micro filter comprises a sintered material filter.

3. The air sensor system of claim 1 , wherein the micro filter has openings of the order of 0.1 μm to 20 to μm.

4. The air sensor system of claim 1 , wherein the micro fitter has a water entry pressure characteristic of the order of 0.1 bar.

5. The air sensor system of claim 1 , wherein the hydrophobic membrane has a water entry pressure characteristic of the order of 1 to 10 bar.

6. The air sensor system of claim 1 , wherein the micro filter and the hydrophobic membrane are in direct physical contact with each other.

7. An air sensor system comprising:
a pressure or airflow sensor;
a fitter housing that defines an air flow path to the air pressure sensor; and
a filter in the airflow path, the filter comprising:
a micro filter; and
a hydrophobic membrane downstream of the micro filter in the air flow path to the pressure or airflow sensor:

wherein the filter housing has a recess, and the filter is located in the recess.

8. The air sensor system of claim 7 , further comprising a seal, which is located in the recess between the filter housing and a downstream surface of the filter.

9. The air sensor system of claim 8 , wherein a thickness of the seal defines a tapering profile as it extends away from the filter.

10. The air sensor system of claim 8 , wherein the seal comprises one or more ribs that extend away from, and around, an outer surface of the seal, in order to engage with the filter housing.

11. The air sensor system of claim 1 , wherein an upstream surface of the filter is flush with an outer surface of the filter housing.

12. An air sensor system comprising:
a pressure or airflow sensor;
a filter housing that defines an air flow path to the air pressure sensor; and
at least one filter in the air flow path,
the filter comprising:
a micro filter; and
a hydrophobic membrane downstream of the micro filter in the air flow path to the pressure or airflow sensor; and

wherein the at least one filter comprises a plurality of filters located in the filter housing.

13. The air sensor system of claim 12 , wherein downstream of each of the plurality of filters is a filter-conduit that connects to a common sensor-conduit, and wherein the sensor-conduit is in fluid communication with the pressure or airflow sensor.

14. An agricultural machine comprising one or more air sensor systems, each comprising:
a pressure or airflow sensor;
a filter housing that defines an air flow path to the air pressure sensor; and
a filter in the air flow path, the filter comprising:
a micro filter; and
a hydrophobic membrane downstream of the micro filter in the air flow path to the pressure or airflow sensor

wherein the filter housing has a recess, and the filter is located in the recess.

Assignees

• Cnh Ind America Llc

Inventors

• Missotten Bart M A
• Aesaert Glenn
• Carpentier Michael
• Jongmans Dré W J
• Vanmullem Brecht
• Viaene Karel M C

Classifications

• B01D46/444

  by flow measuring · CPC title

• G01P5/14 Primary

  by measuring differences of pressure in the fluid · CPC title

• G01F1/34

  by measuring pressure or differential pressure · CPC title

• G01F1/6842

  with means for influencing the fluid flow · CPC title

• G01L19/0645

  using isolation membranes, specially adapted for protection · CPC title