Sensor for detecting particles

Patent metadata

Field	Value
Publication number	US-10690580-B2
Application number	US-201515321036-A
Country	US
Kind code	B2
Filing date	May 29, 2015
Priority date	Jul 2, 2014
Publication date	Jun 23, 2020
Grant date	Jun 23, 2020

Abstract

A sensor for detecting particles, in particular, soot particles, is described. The sensor includes a sensor element having at least two measuring electrodes, which are situated on a carrier substrate, and a protective tube assembly having at least one outer protective tube and one inner protective tube. The sensor element is situated in the inner protective tube in a longitudinal extension direction. The outer protective tube and the inner protective tube are designed to permit the particles to access the sensor element in a direction deviating from the longitudinal extension direction.

First claim

What is claimed is:

1. A sensor for detecting soot particles, comprising:
a sensor element having at least two measuring electrodes which are situated on a carrier substrate; and
a protective tube assembly having at least one outer protective tube and one inner protective tube, the sensor element being situated in the inner protective tube in a longitudinal extension direction, the outer protective tube and the inner protective tube being designed to permit the particles to access the sensor element, the inner protective tube being designed to permit the particles to access the sensor element in a direction deviating from the longitudinal extension direction,
wherein an entire surface of the at least two measuring electrodes is uniformly acted upon by the particles,
wherein the inner protective tube includes openings with differing opening areas,
a sensor housing, wherein the sensor element protrudes from the sensor housing in the longitudinal extension direction, the inner protective tube including openings with differing opening areas, the opening areas decreasing away from the sensor housing in the longitudinal extension direction.

2. The sensor as recited in claim 1 , wherein the inner protective tube includes flaps, which protrude in the direction of the sensor element.

3. The sensor as recited in claim 2 , wherein the inner protective tube includes openings which are adjacent to the flaps.

4. The sensor as recited in claim 2 , wherein the flaps are angled with respect to the longitudinal extension direction.

5. The sensor as recited in claim 2 , wherein
the flaps having different lengths relative to one another, the length of the flaps increasing away from the sensor housing in the longitudinal extension direction.

6. The sensor as recited in claim 2 , wherein the flaps are situated on a section of the inner protective tube, which faces the measuring electrodes.

7. The sensor as recited in claim 1 ,
wherein the inner protective tube tapers away from the sensor housing in the longitudinal extension direction.

8. The sensor as recited in claim 1 , wherein the inner protective tube tapers uniformly or non-uniformly, in steps.

9. The sensor as recited in claim 1 , further comprising:
a middle protective tube situated between the outer protective tube and the inner protective tube.

10. The sensor as recited in claim 9 , wherein the inner protective tube is connected to the middle protective tube on a front side, which faces away from the sensor housing.

11. The sensor as recited in claim 1 , wherein the inner protective tube has a square cross-sectional shape with a cross section perpendicular to the longitudinal extension direction.

Assignees

• Bosch Gmbh Robert

Inventors

• Tiefenbach Andy
• Holzknecht Christopher
• Baars Enno
• Freikamp Frank
• Bessen Michael

Classifications

• G01N15/06 Primary

  Investigating concentration of particle suspensions (by weighing G01N5/00; investigating sedimentation of particle suspensions G01N15/04; investigating individual particles G01N15/10) · CPC title

• G01N15/0656 Primary

  using electric, e.g. electrostatic methods or magnetic methods (by investigating individual particles G01N15/1031, G01N15/12) · CPC title

• F01N13/008

  Mounting or arrangement of exhaust sensors in or on exhaust apparatus (sensor arrangements for engine control F02D41/1439) · CPC title

• F01N2560/05

  the means being a particulate sensor · CPC title

• G01N27/403

  Cells and electrode assemblies · CPC title