Method of controlling lambda sensor preheating and lambda sensor drive controller
US-2015377827-A1 · Dec 31, 2015 · US
Circuit assembly for operating a gas probe
US9983157B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9983157-B2 |
| Application number | US-201113704650-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jun 10, 2011 |
| Priority date | Jun 15, 2010 |
| Publication date | May 29, 2018 |
| Grant date | May 29, 2018 |
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- Title
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Abstract
Official abstract text for this publication.
The invention relates to a circuit assembly for operating a probe ( 10 ) for determining the oxygen concentration in a gas mixture, in particular a Lambda probe for determining the oxygen concentration in the exhaust gas of internal combustion engines, comprising two electrodes ( 11, 15 ) which act as an outer and an inner pump electrode and form a pump cell, two electrodes which act as a Nernst electrode ( 15 ) and a reference electrode ( 19 ) and form a Nernst cell, and a pump current controller ( 210 ), which controls a pump current that is applied to the pump cell such that a predeterminable Nernst voltage (U N ) that can be tapped at the Nernst cell is controlled to a predeterminable value, characterized in that the predeterminable value of the Nernst voltage can be varied.
First claim
Opening claim text (preview).
The invention claimed is: 1. A circuit assembly for operating a probe ( 10 ) for determining the oxygen concentration in a gas mixture comprising a pump cell having two electrodes ( 11 , 15 ), as an outer and an inner pump electrode, a Nernst cell having two electrodes, a Nernst electrode ( 15 ) and a reference electrode ( 19 ), and a pump current controller ( 210 ), which controls a pump current that is applied to the pump cell such that a predeterminable Nernst voltage (U N ), that can be tapped at the Nernst cell, is controlled to a predeterminable value, characterized in that the predeterminable value of the Nernst voltage is varied. 2. The circuit assembly according to claim 1 , characterized in that the predeterminable value of the Nernst voltage is varied as a function of an operating point. 3. The circuit assembly according to claim 1 , characterized in that the predeterminable value is continuously varied. 4. The circuit assembly according to claim 1 , characterized in that the predeterminable value of the Nernst voltage is controlled in steps to at least two voltage values. 5. The circuit assembly according to claim 1 , characterized in that the predeterminable value of the Nernst voltage is varied as a function of the probe temperature. 6. The circuit assembly according to claim 1 , characterized in that the predeterminable value of the Nernst voltage is varied as a function of the composition of the gas mixture. 7. The circuit assembly according to claim 1 , characterized in that the predeterminable value of the Nernst voltage is varied as a function of the probe temperature and the composition of the gas mixture. 8. The circuit assembly according to claim 7 , characterized in that the predeterminable value of the Nernst voltage is reduced if a nominal operating temperature of the probe is undershot. 9. The circuit assembly according to claim 8 , characterized in that the predeterminable value of the Nernst voltage is reduced from 450 mV to 200 mV if a nominal operating temperature of the probe is undershot.
Assignees
Inventors
Classifications
- G01N27/419Primary
Measuring voltages or currents with a combination of oxygen pumping cells and oxygen concentration cells · CPC title
- G01N27/00Primary
Investigating or analysing materials by the use of electric, electrochemical, or magnetic means (G01N3/00 – G01N25/00 take precedence; measurement or testing of electric or magnetic variables or of electric or magnetic properties of materials G01R) · CPC title
Circuit arrangements specially adapted therefor · CPC title
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Frequently asked questions
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- What does patent US9983157B2 cover?
- The invention relates to a circuit assembly for operating a probe ( 10 ) for determining the oxygen concentration in a gas mixture, in particular a Lambda probe for determining the oxygen concentration in the exhaust gas of internal combustion engines, comprising two electrodes ( 11, 15 ) which act as an outer and an inner pump electrode and form a pump cell, two electrodes which act as a Nerns…
- Who is the assignee on this patent?
- Bevot Claudius, Schichlein Helge, Bosch Gmbh Robert
- What technology area does this patent fall under?
- Primary CPC classification G01N27/419. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue May 29 2018 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).