US5505837A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sensor arrangement for determining gas components and/or gas concentrations of gas mixtures
Assignee: Robert Bosch GmbH
•
Filing: 1994-03-17
•
Granted: 1996-04-09
•
Expires: 2014-03-17
Abstract
Abstract A sensor arrangement for determining at least one of gas components and gas concentrations of gas mixtures including CO, NO x and HC in exhaust gases of internal combustion engines, includes a measuring element which has a sensitive region; and a pump cell that includes a solid electrolyte and inner and outer pump electrodes which are opposingly disposed at least on the solid electrolyte and which effect an oxygen transfer to the measuring element, wherein the pump cell and the measuring element are spatially separated from one another, are located in different temperature zones during operation of the sensor arrangement, and are connected to one another by a diffusion segment through which oxygen can diffuse from the pump cell to the measuring element.
Inventors
- 👤 Karl-Hermann Friese
- 👤 Hermann Dietz
- 👤 Werner Gruenwald
- 👤 Gerhard Hoetzel
- 👤 Harald Neumann
- 👤 Johann Riegel
- 👤 Bernd Schumann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:53
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/416; G01N27/417; G01N27/419
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
133 words
A sensor arrangement for determining at least one of gas components and gas concentrations of gas mixtures including CO, NO x and HC in exhaust gases of internal combustion engines, comprising: a measuring element which has a sensitive region; and a pump cell that includes a solid electrolyte and inner and outer pump electrodes which are opposingly disposed at least on the solid electrolyte and which effect an oxygen transfer to the measuring element, wherein the pump cell and the measuring element are spatially separated from one another, in a lateral arrangement and are located in different temperature zones during operation of the sensor arrangement, and are connected to one another by a diffusion segment through which oxygen diffuses from the pump cell to the measuring element during operation of the sensor arrangement.
Claim 2
Dependent Claim
133 words
A sensor arrangement for determining at least one of gas components and gas concentrations of gas mixtures including CO, NO x and HC in exhaust gases of internal combustion engines, comprising: a measuring element which has a sensitive region; and a pump cell that includes a solid electrolyte and inner and outer pump electrodes which are opposingly disposed at least on the solid electrolyte and which effect an oxygen transfer to the measuring element, wherein the pump cell and the measuring element are spatially separated from one another, in a lateral arrangement and are located in different temperature zones during operation of the sensor arrangement, and are connected to one another by a diffusion segment through which oxygen diffuses from the pump cell to the measuring element during operation of the sensor arrangement.
Claim 3
Dependent Claim
66 words
The sensor arrangement according to claim 1, wherein the sensor arrangement is a layer system in which the solid electrolyte is at least one oxygen-ion-conducting, solid electrolyte ceramic, wherein the diffusion segment is integrated into the layer system, and wherein oxygen pumped by the pump cell is supplied to the measuring element via the diffusion segment and via a diffusion opening provided, near the measuring element.
Claim 4
Dependent Claim
39 words
The sensor arrangement according to claim 2, further comprising a cover film, wherein the diffusion opening is a recess defined in the cover film, and wherein the measuring element including the sensitive region is disposed in the diffusion opening.
Claim 5
Dependent Claim
16 words
The sensor arrangement according to claim 3, wherein the measuring element is a semiconducting gas sensor.
Claim 6
Dependent Claim
58 words
The sensor arrangement according to claim 2, further comprising a cover layer which surrounds the diffusion segment in a gas-tight manner, wherein the diffusion opening is defined in the cover layer, and wherein a porous insulating layer is provided above the diffusion opening and onto which porous insulating layer is disposed the measuring element with the sensitive region.
Claim 7
Dependent Claim
52 words
The sensor arrangement according to claim 2, further comprising a cover layer surrounding the diffusion segment in a gas tight manner, wherein a diffusion opening is defined in the cover layer, and wherein the measuring element is an electrochemical measuring cell that is positioned with the sensitive region in the diffusion opening.
Claim 8
Dependent Claim
34 words
The sensor arrangement according to claim 6, further comprising a measuring electrode which is inserted into the diffusion opening, and wherein the inner pump electrode serves as a reference electrode for the measuring cell.
Claim 9
Dependent Claim
82 words
The sensor arrangement according to claim 7, further comprising a gas-tight cover which covers the sensitive region of the measuring cell and in which are defined recesses which define at least one measured gas opening, wherein the diffusion layer extends into the recesses defined in the gas-tight cover layer whereby measured gas is supplied to the sensitive region via the diffusion layer, and wherein the diffusion layer is in contact with the measured gas via the at least one measured gas opening.
Claim 10
Dependent Claim
36 words
The sensor arrangement according to claim 8, wherein the at least one measured gas opening is located in a temperature zone of the sensor arrangement in which the measured gas is exposed to a minimum pre-catalysis.
Claim 11
Dependent Claim
16 words
The sensor arrangement according to claim 8, wherein the diffusion segment is a porous diffusion layer.
Claim 12
Dependent Claim
15 words
The sensor arrangement according to claim 1, wherein the diffusion segment is a diffusion conduit.
Claim 13
Dependent Claim
41 words
The sensor arrangement according to claim 1, wherein the measuring element, the diffusion segment, and the pump cell are positioned so that an oxygen surplus is present at the sensitive region of the measuring element during operation of the sensor arrangement.
Claim 14
Dependent Claim
36 words
The sensor arrangement according to claim 1, wherein the pump cell and the measuring element respectively employ separate heating elements, each heating element having a respective heat output, which respective heat outputs provide respective operating temperatures.
Claim 15
Dependent Claim
57 words
The sensor arrangement according to claim 1, wherein the pump cell and the measuring element have respective temperature zones, each respective temperature zone having a temperature, and wherein the temperature of the temperature zone of the pump cell is about 700° C. and the temperature of the temperature zone of the measuring element is about 500° C.
Claim 16
Dependent Claim
37 words
The sensor arrangement according to claim 1, wherein the sensor arrangement further comprises at least one heating device for establishing respective operating temperatures for the pump cell and the measuring element and providing the different temperature zones.
Claim 17
Dependent Claim
30 words
The sensor arrangement according to claim 15, wherein the sensor arrangement is an assembly of layers having a ceramic substrate within which the at least one heating device is embedded.
Claim 18
Dependent Claim
114 words
The sensor arrangement according to claim 15, wherein the sensor arrangement is an assembly of layers extending in a lateral direction parallel to the surface and in a vertical direction perpendicular to the surface, wherein at least the pump cell and the measuring element are integrated within the assembly of layers, and are respectively disposed in the lateral direction so that the pump cell and the measuring cell are spatially separated from one another and whereby the pump cell and the measuring element are located in the different temperature zones during operation of the sensor arrangement, and wherein the diffusion segment extends in the lateral direction from the pump cell to the measuring element.
Claim 19
Dependent Claim
57 words
The sensor arrangement according to claim 17, wherein the pump cell and the measuring element have respective temperature zones, each respective temperature zone having a temperature, and wherein the temperature of the temperature zone of the pump cell is about 700° C. and the temperature of the temperature zone of the measuring element is about 500° C.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-04-09 | 1999-10-09 | 2000-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-04-09 | 2003-10-09 | 2004-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-04-09 | 2007-10-09 | 2008-04-09 | $7700.00 | Window Closed / Lapsed |