Exhaust species sensing method and device
AssigneeDelphi Technologies, Inc.
InventorsDa Yu Wang, Raymond L. Bloink, Frederick L. Kennard, Lone-Wen F. Tai, Eric J. Detwiler, Walter J. Symons, Paul C. Kikuchi, Lora Younkman
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Abstract
A gas sensor for sensing NOx having electrochemical cells wherein dielectric material surrounds electrolytes except where electrodes are attached. Thereby, the exhaust gas is effectively prevented from contacting the electrolytes of the sensor's electrochemical cells. With the use of this technique, signal cross talk is minimized while enhancing NOx sensing sensitivity. Further, the total number electrodes needed are reduced which allows for more complex sensors structures.
Claims21
A gas sensor, comprising:
- a first electrochemical cell having a first electrolyte disposed between and in ionic communication with first and second electrodes;
- a second electrochemical cell having a second electrolyte disposed between and in ionic communication with third and fourth electrodes wherein said first and second electrochemical cells are ionically isolated from each other;
- a third electrochemical cell having a fifth electrode disposed on the same side of the second electrolyte as the third electrode, wherein the fifth electrode and the third electrode are disposed in a spaced relation;
- and
- at least two layers of dielectric material, wherein said first and second electrolytes are each disposed in a separate layer of the dielectric material.
A gas sensor, comprising:
- a first electrochemical cell having a first electrolyte disposed between and in ionic communication with first and second electrodes;
- a second electrochemical cell having a second electrolyte disposed between and in ionic communication with third and fourth electrodes wherein said first and second electrochemical cells are ionically isolated from each other;
- a third electrochemical cell having a fifth electrode disposed on the same side of the second electrolyte as the third electrode, wherein the third and fifth electrodes are disposed in a spaced relation;
- a fourth electrochemical cell disposed on a side of the second electrochemical cell opposite the first electrochemical cell, the fourth electrochemical cell having a third electrolyte disposed between and in ionic communication with sixth and seventh electrodes, wherein the fourth electrochemical cell is disposed in a dielectric layer, and wherein the first, second, and fourth electrochemical cells substantially ionically isolated from one another;
- and
- at least two layers of dielectric material, wherein said first and second electrolytes are each disposed in a separate layer of the dielectric material.
A gas sensor for sensing NOx, comprising:
- a first electrochemical cell having a first electrolyte disposed between and in electrical communication with first and second electrodes;
- a second electrochemical cell having a second electrolyte disposed between and in electrical communication with third and fourth electrodes;
- a third electrochemical cell having said second electrolyte disposed between and in electrical communication with a fifth and said fourth electrodes wherein said first, second, and third electrochemical cells are ionically isolated from each other;
- a dielectric material surrounding said first, second, and third electrochemical cells wherein said first and second electrolytes are each embedded in a separate layer of dielectric material.
Dependencies are inferred from the claim text.