Ammonia sensor element, heater, and method for making the same
AssigneeDelphi Technologies, Inc.
InventorsDavid K. Chen, Raymond L. Bloink, Carlos A. Valdes, Eric L. Ker, Jinping Zhang
Life of this patent
Estimating the term…
Abstract
A sensor element can comprise a co-fired heater section, a sensing section, and a third insulating layer disposed between the electrode portion and the temperature sensor. The heater section can comprise a heater, a shield, and a temperature sensor, with a first insulating layer disposed between the heater and the shield, and a second insulating layer disposed between the shield and the temperature sensor. The sensing section can comprise an electrode portion and a sensing portion, wherein the sensing portion is disposed on a side of the electrode portion opposite the heater section.
Claims15
A sensor element, comprising:
- a co-fired heater section comprising a heater, a shield, and a temperature sensor, with a first insulating layer disposed between the heater and the shield, and a second insulating layer disposed between the shield and the temperature sensor;
- a sensing section comprising an electrode portion and a sensing portion, wherein the sensing portion is disposed on a side of the electrode portion opposite the heater section;
- and
- a third insulating layer disposed between the electrode portion and the temperature sensor,
- wherein the heater further comprises,
- a serpentine, wherein the serpentine comprises center inner legs, second inner legs, and outer legs, and wherein the second inner legs have a varying second width, and
- leads in electrical communication with the outer legs,
- wherein, during operation, the heater has a longitudinal temperature gradient of less than or equal to about 5° C.
A sensor element, comprising:
- a co-fired heater section comprising a heater, a shield, and a temperature sensor, with a first insulating layer disposed between the heater and the shield, and a second insulating layer disposed between the shield and the temperature sensor;
- a sensing section comprising an electrode portion and a sensing portion, wherein the sensing portion is disposed on a side of the electrode portion opposite the heater section;
- and
- a third insulating layer disposed between the electrode portion and the temperature sensor,
- wherein the third insulating layer has a surface roughness of less than or equal to about 0.5 micrometers.
A sensor element, comprising:
- a heater section comprising a heater, a shield, and a temperature sensor, with a first insulating layer disposed between the heater and the shield, and a second insulating layer disposed between the shield and the temperature sensor;
- a sensing section comprising an electrode portion and a sensing portion, wherein the sensing portion is disposed on a side of the electrode portion opposite the heater section;
- and
- a third insulating layer disposed between the electrode portion and the temperature sensor;
- wherein the heater comprises a serpentine and leads in electrical communication with the serpentine, wherein the serpentine comprises center inner legs, second inner legs, and outer legs, and wherein the second inner legs have a varying second width, and
- wherein the third insulating layer has a surface roughness of less than or equal to about 0.5 micrometers.
A sensor element, comprising:
- a co-fired heater section comprising a heater, a shield, and a temperature sensor, with a first insulating layer disposed between the heater and the shield, and a second insulating layer disposed between the shield and the temperature sensor;
- a sensing section comprising an electrode portion and a sensing portion, wherein the sensing portion is disposed on a side of the electrode portion opposite the heater section;
- a third insulating layer disposed between the electrode portion and the temperature sensor;
- and
- a protective divider disposed between the electrode portion and the sensing portion, prior to co-firing.
Dependencies are inferred from the claim text.