Device for triggering an electrical signal for a filter with an aqueous solution

Patent metadata

Field	Value
Publication number	US-10300413-B2
Application number	US-201415102913-A
Country	US
Kind code	B2
Filing date	Dec 4, 2014
Priority date	Dec 12, 2013
Publication date	May 28, 2019
Grant date	May 28, 2019

Abstract

A filter for an aqueous solution, such as urea, of a diesel vehicle selective catalytic reduction system, includes a housing provided with an inlet and with an outlet and, inside which, is arranged a filter element. Variations in volume associated with changes in phase of the aqueous solution are detected and a switch which switches upon changes in phase of the aqueous solution signals the variations in volume.

First claim

The invention claimed is:

1. A filter for an aqueous solution of a diesel vehicle selective catalytic reduction system, the filter comprising
a housing provided with an inlet and with an outlet;
a filter element inside the housing;
a means which detects variations in volume associated with changes in phase of the aqueous solution; and
a signaling means which signals the variations in volume, the signaling means comprising a switch that switches upon changes in phase of the aqueous solution.

2. The filter as claimed in claim 1 , in which the signaling means additionally comprises a deformable membrane collaborating with the switch to signal change in phase of the aqueous solution.

3. The filter as claimed in claim 2 , in which the deformable membrane defines an expansion chamber for the variations in volume.

4. The filter as claimed in claim 3 , in which the expansion chamber is filled with a gas or with a soft foam.

5. The filter as claimed in claim 3 , in which the switch is situated in the expansion chamber.

6. The filter as claimed in claim 2 , in which the deformable membrane is planar.

7. The filter as claimed in claim 2 , in which the switch comprises at least one contact arranged on the deformable membrane.

8. The filter as claimed in claim 2 , in which the switch is activated by a magnet, the switch being a Reed-type switch, the switch or the magnet being arranged on the deformable membrane.

9. The filter as claimed in claim 1 , in which the filter comprises a heating means incorporated into the filter element.

10. The filter as claimed in claim 1 , in which the switch comprises a first electrical contact and a second electrical contact such that the first electrical contact and the second electrical contact are placed in electrical communication which triggers an electrical signal, and taken out of electrical communication with each other, upon changes in phase of the aqueous solution.

Assignees

• Delphi Tech Ip Ltd

Inventors

• Daniel Patrick
• Amand Alain

Classifications

• B01D53/9418

  for removing nitrogen oxides by selective catalytic reduction [SCR] using a reducing agent in a lean exhaust gas · CPC title

• B01D35/18 Primary

  Heating or cooling the filters · CPC title

• B01D35/1435

  with alarm means · CPC title

• B01D29/608

  by temperature measuring · CPC title

• B01D29/60

  integrally combined with devices for controlling the filtration · CPC title