DE102005027637A1 - Device for measuring oxygen concentration in gas mixtures, especially exhaust gases, has current-voltage converter to which pulsed control signal is applied when measurement device is switched off - Google Patents
Device for measuring oxygen concentration in gas mixtures, especially exhaust gases, has current-voltage converter to which pulsed control signal is applied when measurement device is switched off Download PDFInfo
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- DE102005027637A1 DE102005027637A1 DE200510027637 DE102005027637A DE102005027637A1 DE 102005027637 A1 DE102005027637 A1 DE 102005027637A1 DE 200510027637 DE200510027637 DE 200510027637 DE 102005027637 A DE102005027637 A DE 102005027637A DE 102005027637 A1 DE102005027637 A1 DE 102005027637A1
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- control signal
- voltage converter
- current
- oxygen concentration
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/403—Cells and electrode assemblies
- G01N27/414—Ion-sensitive or chemical field-effect transistors, i.e. ISFETS or CHEMFETS
- G01N27/4141—Ion-sensitive or chemical field-effect transistors, i.e. ISFETS or CHEMFETS specially adapted for gases
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- Molecular Biology (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Engineering & Computer Science (AREA)
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- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
Description
Die Erfindung betrifft eine Vorrichtung zur Messung der Sauerstoffkonzentration in Mischgasen, insbesondere Abgasen, umfassend ein Gehäuse, welches einen Kondensatabscheider und eine hinter diesem angeordnete elektrochemische Sensoreinheit aufnimmt, deren Kontakte mit einem elektronischen Stromspannungswandler verbunden sind.The The invention relates to a device for measuring the oxygen concentration in mixed gases, in particular exhaust gases, comprising a housing, which a Kondensatabscheider and arranged behind this electrochemical Sensor unit receives, whose contacts with an electronic Voltage converters are connected.
Zur Messung der Sauerstoffkonzentration in Mischgasen werden Messgeräte mit elektrochemischen Sensoren verwendet. Derartige Sensoren arbeiten prinzipiell wie eine Brennstoffzelle. Dabei wird die Messkomponente Sauerstoff an der Grenzschicht Katode/Elektrolyt elektrochemisch umgesetzt. Der daraus resultierende Strom ist der Sauerstoffkonzentration proportional. Um insbesondere bei Langzeitmessungen die Messgeräte vor unnötigen Belastungen durch Kondensatabscheidungen an den Sensoren zu schützen, sind Ihnen Kondensatabscheider vorgeschaltet. Sie enthalten eine Kühleinheit, durch die das Mischgas geführt wird.to Measurement of oxygen concentration in mixed gases are measuring devices with electrochemical Sensors used. Such sensors work in principle as a fuel cell. The measuring component becomes oxygen the boundary layer cathode / electrolyte electrochemically reacted. The result resulting current is proportional to the oxygen concentration. In particular for long-term measurements, the measuring devices against unnecessary loads by condensate deposits on the sensors to protect are Upstream of the condensate separator. They contain a cooling unit, passed through the mixed gas becomes.
Beim Kühlen des Abgases wird der größte Teil der in ihm enthaltenen Feuchtigkeit in Form von Kondensat abgeschieden. An den nachgeordneten Sensoren kann kein Kondensat mehr anfallen. Dem Sauerstoffsensor nachgeschaltet ist eine Filter- und Verstärkerschaltung, welche der Auswertung der an dem Sensor anliegenden Ströme dient. An der Filter- und Verstärkerschaltung liegt bei Betrieb des Messgerätes eine kontinuierliche Steuerspannung an. Nach Einschalten der Messgeräte benötigen diese eine Einlaufzeit von etwa drei bis fünf Minuten. Die Sensoren haben eine Lebensdauer von etwa ein bis zwei Jahren.At the Cool the exhaust gas becomes the largest part the moisture contained in it in the form of condensate deposited. The downstream sensors can no longer produce condensate. Downstream of the oxygen sensor is a filter and amplifier circuit, which serves to evaluate the currents applied to the sensor. At the filter and amplifier circuit lies during operation of the measuring device a continuous control voltage. After switching on the measuring devices they need one Warm-up time of about three to five Minutes. The sensors have a lifespan of about one to two Years.
Aufgabe der vorliegenden Erfindung ist es, die Einlaufzeit derartiger Messgeräte zu verkürzen und gleichzeitig die Lebensdauer der Sauerstoffsensoren zu verlängern. Gemäß der Erfindung wird diese Aufgabe dadurch gelöst, dass der Stromspannungswandler mit einem gepulsten Steuersignal in ausgeschaltetem Zustand des Messgerätes beaufschlagt ist.task The present invention is to shorten the running time of such meters and at the same time extend the life of the oxygen sensors. According to the invention this task is solved by that the current-voltage converter with a pulsed control signal is acted upon in off state of the meter.
Mit der Erfindung ist eine Vorrichtung zur Messung der Sauerstoffkonzentration in Mischgasen, insbesondere Abgasen geschaffen, welche eine geringe Einlaufzeit hat und bei der die Lebenszeit des Sauerstoffsensors verlängert ist.With The invention is an apparatus for measuring the oxygen concentration created in mixed gases, in particular exhaust gases, which a small Warm-up time and lifetime of the oxygen sensor extended is.
In Weiterbildung der Erfindung ist das Steuersignal mit einer Taktfrequenz von 1 Hz gepulst. Hierdurch ist die Lebensdauer etwa um den Faktor 2 erhöht, was auf dem Verhältnis der Ein- und Ausschaltdauer von 1:1 beruht. Bei diesem Verhältnis ergibt sich darüber hinaus eine deutlich geringere Einlaufzeit des Messgerätes.In Further development of the invention is the control signal with a clock frequency pulsed by 1 Hz. As a result, the lifetime is about the factor 2 increased, what's on the ratio the on and off duration of 1: 1 is based. At this ratio results about it In addition, a significantly lower break-in period of the meter.
In Ausgestaltung der Erfindung weist der Stromspannungswandler einen Feldeffekttransistor (FET) auf, an dessen Gate-Elektrode das gepulste Steuersignal anliegt. Hierdurch ist eine optimale Filterung des Ausgangssignals des Sauerstoffsensors erzielt.In Embodiment of the invention, the current-voltage converter has a Field effect transistor (FET) on whose gate electrode, the pulsed control signal is applied. This provides optimal filtering of the output signal achieved the oxygen sensor.
Andere Ausgestaltungen und Weiterbildungen der Erfindung sind in den übrigen Unteransprüchen angegeben. Ein Ausführungsbeispiel der Erfindung ist in den Zeichnungen dargestellt und wird nachfolgend im Einzelnen beschrieben. Es zeigen:Other Embodiments and developments of the invention are specified in the remaining subclaims. An embodiment The invention is illustrated in the drawings and will become apparent below described in detail. Show it:
Die
als Ausführungsbeispiel
gewählte
Vorrichtung zur Messung der Sauerstoffkonzentration in Mischgasen
besteht im Wesentlichen aus einem Kondensatabscheider
Der
Kondensatabschneider
Der
Sauerstoffsensor ist im Wesentlichen gebildet aus einem Gehäuse
Der
Stromspannungswandler
Claims (4)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200510027637 DE102005027637A1 (en) | 2005-06-14 | 2005-06-14 | Device for measuring oxygen concentration in gas mixtures, especially exhaust gases, has current-voltage converter to which pulsed control signal is applied when measurement device is switched off |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200510027637 DE102005027637A1 (en) | 2005-06-14 | 2005-06-14 | Device for measuring oxygen concentration in gas mixtures, especially exhaust gases, has current-voltage converter to which pulsed control signal is applied when measurement device is switched off |
Publications (1)
Publication Number | Publication Date |
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DE102005027637A1 true DE102005027637A1 (en) | 2006-12-28 |
Family
ID=37513337
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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DE200510027637 Withdrawn DE102005027637A1 (en) | 2005-06-14 | 2005-06-14 | Device for measuring oxygen concentration in gas mixtures, especially exhaust gases, has current-voltage converter to which pulsed control signal is applied when measurement device is switched off |
Country Status (1)
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DE (1) | DE102005027637A1 (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE29505570U1 (en) * | 1995-03-31 | 1995-09-21 | Reiß, Gerhard, Dr., 69469 Weinheim | Connection fitting for an electrochemical sensor |
WO1996025661A1 (en) * | 1995-02-17 | 1996-08-22 | Rainer Gorris | Process for improving the functioning and catalytic activity of electrodes and catalytic substances used in an electrochemical or electrocatalytic process |
DE19648685A1 (en) * | 1996-11-25 | 1998-05-28 | Bosch Gmbh Robert | Gas sensor |
WO2002082067A2 (en) * | 2001-04-05 | 2002-10-17 | Robert Bosch Gmbh | Gas sensor, in particular lambda-probe |
-
2005
- 2005-06-14 DE DE200510027637 patent/DE102005027637A1/en not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1996025661A1 (en) * | 1995-02-17 | 1996-08-22 | Rainer Gorris | Process for improving the functioning and catalytic activity of electrodes and catalytic substances used in an electrochemical or electrocatalytic process |
DE29505570U1 (en) * | 1995-03-31 | 1995-09-21 | Reiß, Gerhard, Dr., 69469 Weinheim | Connection fitting for an electrochemical sensor |
DE19648685A1 (en) * | 1996-11-25 | 1998-05-28 | Bosch Gmbh Robert | Gas sensor |
WO2002082067A2 (en) * | 2001-04-05 | 2002-10-17 | Robert Bosch Gmbh | Gas sensor, in particular lambda-probe |
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OP8 | Request for examination as to paragraph 44 patent law | ||
8130 | Withdrawal | ||
8165 | Unexamined publication of following application revoked |