Oxygen sensor

• US 6,276,191 B1
• Filed: 07/19/1999
• Issued: 08/21/2001
• Est. Priority Date: 07/16/1998
• Status: Expired due to Term

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Neumann, Harald, Schumann, Bernd, Moser, Thomas, Stanglmeier, Frank, Schneider, Jens Stefan
• Primary Examiner(s): Larkin, Daniel S.
• Assistant Examiner(s): WIGGINS, JOHN DAVID
• Application Number:
  US09/356,819
• Time in Patent Office: 764 Days
• Field of Search: 73/232, 73/233.1, 73/310.5, 73/233.2, 731/181, 338/34, 338/38, 422/88, 422/94, 204/426, 204/424, 204/427
• US Class Current: 73/23.31
• CPC Class Codes: G01N 27/407 for investigating or analysing gases G01N27/411 takes precedence

Abstract

An oxygen sensor for determining the oxygen concentration in the exhaust gas flow of an internal combustion engine. The sensor includes an outer electrode exposed to the exhaust side and a reference electrode exposed to the ambient air. In the sensor, a space adjacent to the reference electrode or surrounding the reference electrode has an adsorbing and/or absorbing agent, which is introduced, for example, in a loose powder packing or a multiple pellet packing. Other versions of the novel oxygen sensor also have an oxygen supplying material, such as, for example, Mn-oxide, Ba-oxide and/or Ce-oxide, to help promote combustion of exhaust gas components/pollutants and any residue chemicals left remaining from the sensor manufacturing process.

Claims

1. An oxygen sensor for determining an oxygen concentration in an exhaust flow of an internal combustion engine, comprising:

an external electrode exposed to an exhaust side;

a reference electrode exposed to one of a reference atmosphere and an ambient air, the reference electrode being disposed on a reference side that is isolated from the exhaust side; and

a material including at least one of an adsorbing agent and an absorbing agent and being provided in one of a space adjacent to the reference electrode and a space surrounding the reference electrode, the material being able to at least one of take up and bind with at least one of H₂O, CO and a hydrocarbon penetrating from the exhaust side into the one of the reference atmosphere and the ambient air on the reference side.

2. The oxygen sensor according to claim 1, wherein the at least one of the adsorbing agent and the absorbing agent is introduced as a loose powder packing.

3. The oxygen sensor according to claim 1, wherein the at least one of the adsorbing agent and the absorbing agent is introduced as pellets.

4. The oxygen sensor according to claim 1, wherein the at least one of the adsorbing agent and the absorbing agent is introduced as at least one ring.

5. The oxygen sensor according to claim 1, wherein the at least one of the adsorbing agent and the absorbing agent is introduced as an intermediate layer in a packing which seals off the exhaust side from the reference side.

6. The oxygen sensor according to claim 1, wherein the at least one of the adsorbing agent and the absorbing agent includes a zeolite material.

7. The oxygen sensor according to claim 1, further comprising:

a plurality of reference-side mounting parts, wherein one of the reference electrode and the plurality of reference-side mounting parts includes at least one material that supplies additional oxygen for a combustion of one of an exhaust that has penetrated and residues from a manufacturing process.

8. An oxygen sensor for determining an oxygen concentration in an exhaust gas flow of an internal combustion engine, comprising:

an external electrode exposed to an exhaust side;

a reference electrode exposed to one of a reference atmosphere and an ambient air;

a material including at least one of an adsorbing agent and an absorbing agent and being provided in one of a space adjacent to the reference electrode and a space surrounding the reference electrode; and

a plurality of reference-side mounting parts;

wherein one of the reference electrode and the plurality of reference-side mounting parts includes at least one material that supplies additional oxygen for a combustion of one of an exhaust that has penetrated and residues from a manufacturing process; and

wherein the at least one material that supplies the additional oxygen includes at least one of Mn-oxide, Ba-oxide, and Ce-oxide.

9. An oxygen sensor for determining an oxygen concentration in an exhaust flow of an internal combustion engine, comprising:

an external electrode exposed to an exhaust side;

a reference electrode exposed to one of a reference atmosphere and an ambient air;

a material including at least one of an adsorbing agent and an absorbing agent and being provided in one of a space adjacent to the reference electrode and a space surrounding the reference electrode; and

a plurality of reference-side mounting parts;

wherein one of the reference electrode and the plurality of reference-side mounting parts includes at least one material that supplies additional oxygen for a combustion of one of an exhaust that has penetrated and residues from a manufacturing process; and

wherein the at least one material that supplies the additional oxygen is introduced as one of a solution, a plurality of pellets, and as a paste.