DE3525115A1 - Hazardous-material sensor for motor vehicles, working-protection cabs and other stressed spaces having analogous compensation for the influences of temperature and air humidity on semiconductor gas sensors - Google Patents

Hazardous-material sensor for motor vehicles, working-protection cabs and other stressed spaces having analogous compensation for the influences of temperature and air humidity on semiconductor gas sensors

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Publication number
DE3525115A1
DE3525115A1 DE19853525115 DE3525115A DE3525115A1 DE 3525115 A1 DE3525115 A1 DE 3525115A1 DE 19853525115 DE19853525115 DE 19853525115 DE 3525115 A DE3525115 A DE 3525115A DE 3525115 A1 DE3525115 A1 DE 3525115A1
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DE
Germany
Prior art keywords
temperature
sensor
gas sensors
semiconductor gas
cabs
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
DE19853525115
Other languages
German (de)
Inventor
Heinz Dipl Ing Hoelter
Hanns Ing Grad Rump
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE19843431373 external-priority patent/DE3431373A1/en
Application filed by Individual filed Critical Individual
Priority to DE19853525115 priority Critical patent/DE3525115A1/en
Publication of DE3525115A1 publication Critical patent/DE3525115A1/en
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/00642—Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
    • B60H1/00735—Control systems or circuits characterised by their input, i.e. by the detection, measurement or calculation of particular conditions, e.g. signal treatment, dynamic models
    • B60H1/00785—Control systems or circuits characterised by their input, i.e. by the detection, measurement or calculation of particular conditions, e.g. signal treatment, dynamic models by the detection of humidity or frost
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/00642—Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
    • B60H1/00735—Control systems or circuits characterised by their input, i.e. by the detection, measurement or calculation of particular conditions, e.g. signal treatment, dynamic models
    • B60H1/008—Control systems or circuits characterised by their input, i.e. by the detection, measurement or calculation of particular conditions, e.g. signal treatment, dynamic models the input being air quality
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H3/00—Other air-treating devices
    • B60H3/0085—Smell or pollution preventing arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H3/00—Other air-treating devices
    • B60H3/06—Filtering
    • B60H2003/0683—Filtering the quality of the filter or the air being checked

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  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Biomedical Technology (AREA)
  • Health & Medical Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Atmospheric Sciences (AREA)
  • Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)

Abstract

The invention describes the further refinement of a sensor which is described in P 3431373.7, the compensation for moisture and temperature on semiconductor gas sensors by means of electrical circuit measures being described according to the invention.

Description

In der Hauptanmeldung P 34 31 373.7 wird beschrieben, daß die zur Regelung erforderliche Temperaturerfassung unmittelbar am Sensor erfolgt und die Sensorheizspannung auf konstante Beheizungsleistung geregelt wird, wobei der Sensortemperaturfühler und der dazu erforderliche Verstärker - Regelstufe - zur Erzeugung der temperaturgeführten Heizspannung in einem gemeinsamen Gehäuse untergebracht ist und hierbei im Bereich des Sensors das Gehäuse perforiert ausgebildet ist.The main application P 34 31 373.7 describes that the temperature detection required for control takes place directly at the sensor and the sensor heating voltage regulated to constant heating output is, the sensor temperature sensor and the required amplifier - control stage - for generation the temperature-controlled heating voltage in a common Housing is housed in the area of the sensor, the housing is perforated is.

Um die Fehler des erfaßten, schadstoff-, temperatur- und feuchtekorrelierten Ausgangssignals kompensieren zu können, wird erfindungsgemäß vorgeschlagen, die Kennlinien des Sensors in einem Spannungsteiler nachzubilden, der außerhalb des Sensors gemeinsam mit dem Sensor einen Spannungsteiler hin zur gemeinsamen Versorgungsspannung bildet, dergestalt, daß die Einflußgrößen in gleicher proportionaler Wertänderung sowohl des Sensors als auch der Außenbeschaltung sich gegenseitig kompensieren. To avoid the errors of the detected, pollutant, temperature and compensate for the moisture-correlated output signal To be able to, it is proposed according to the invention that To reproduce the characteristic curves of the sensor in a voltage divider, the outside of the sensor together with the Sensor a voltage divider towards the common supply voltage forms, such that the influencing factors in the same proportional change in value both the sensor as well as the external wiring itself compensate each other.  

Ergebnismäßig bleibt das Ausgangssignal über die Temperatur konstant.As a result, the output signal remains above the Temperature constant.

Gleichzeitig wird die Sensorheizleistung ebenfalls in Abhängigkeit von der Temperatur verändert. Bei kleinen Temperaturen wird die Heizspannung (damit die Leistung) erhöht, bei höheren Temperaturen verringert.At the same time, the sensor heating output is also changed depending on the temperature. At low temperatures, the heating voltage (hence the performance) increases at higher temperatures decreased.

In der bevorzugten Ausführung beträgt die Heizspannung bei 20°C 5 V.In the preferred embodiment, the heating voltage is at 20 ° C 5 V.

Es ist charakteristisch für die SnO2-Detektoren, daß die Abhängigkeit von der absoluten Luftfeuchte in hohem Maße an das Vorhandensein des Gases CO gebunden ist.It is characteristic of the SnO 2 detectors that the dependence on the absolute air humidity is to a large extent linked to the presence of the gas CO.

Die Empfindlichkeit des Sensors, CO gegenüber, ist bei wechselnder Heizungsleistung in einem kleineren Bereich zwischen etwa 4,8 und 5,2 Volt nahezu konstant, während die Empfindlichkeit anderen Gasen gegenüber mit zunehmender Heizleistung abnimmt.The sensitivity of the sensor to CO is with changing heating output in a smaller one Range between about 4.8 and 5.2 volts almost constant while the sensitivity of other gases  compared with decreasing heating output.

Die temperaturabhängige Modulation der Heizspannung und die Bemessung des Widerstandsnetzwerkes im Meßzweig sind so dimensioniert, daß die Ausgangswerte bei komplexen Signalen, wie sie im Straßenverkehrsabgas vorhanden sind, - un immer sowohl CO als auch andere Verbindungen enthalten -, durch die Kombination von Heizmodulation und Spannungsteilernetzwerk den Einfluß der Feuchte dadurch zurückdrängen, weil die absolute Feuchte in hohem Maße an die Lufttemperatur gekoppelt ist, der Temperatureinfluß die Heizspannung und damit die Empfindlichkeit allen Gasen außer CO gegenüber verändert, und der Spannungsteiler im Meßzweig zusätzlich zur reinen Temperaturempfindlichkeit diese zusätzliche Änderung ebenfalls mit berücksichtigt.The temperature-dependent modulation of the heating voltage and the dimensioning of the resistance network in the measuring branch are dimensioned so that the initial values with complex signals such as those found in road traffic emissions are present - and always both CO and other compounds included - by the combination of heating modulation and voltage divider network Suppress the influence of moisture because the absolute humidity to a high degree at the air temperature coupled, the temperature influence the heating voltage and thus the sensitivity of all gases except CO changed compared to, and the voltage divider in Measuring branch in addition to the pure temperature sensitivity this additional change is also taken into account.

Der erfindungsgemäße Gedanke wird anhand beiliegender Schaltskizze realisiert.The idea according to the invention is illustrated in the attached Circuit diagram realized.

In der Skizze ist der Sensor mit (1) bezeichnet, der Außenwiderstand ist mit (2) bezeichnet und besteht aus einem temperaturabhängigen Widerstand mit negativem Temperaturkoeffizienten sowie (4) einem parallel geschalteten Linearisierungswiderstand und einem längsgeschalteten Begrenzungswiderstand (5). Parallel zum Sensor ist ein Linearisierungswiderstand (6) geschaltet, um die nicht lineare Kennlinie des Sensors zu linearisieren.In the sketch, the sensor is labeled ( 1 ), the external resistance is labeled ( 2 ) and consists of a temperature-dependent resistor with a negative temperature coefficient, and ( 4 ) a linearization resistor connected in parallel and a series resistor ( 5 ). A linearization resistor ( 6 ) is connected in parallel to the sensor in order to linearize the non-linear characteristic of the sensor.

Die Modulation der Heizspannung wird aus der Hauptanmeldung P 34 31 373.7 übernommen.The modulation of the heating voltage is based on the main application P 34 31 373.7 adopted.

In der Hauptanmeldung wird die Spannungsmodulation durchgeführt, indem im positiven Zweig ein PTC - Widerstand angebracht ist. Selbstverständlich ist es möglich, im negativen Zweig des Spannungsteilers einen NTC-Widerstand vorzusehen.In the main application, the voltage modulation performed by a PTC in the positive branch Resistance is appropriate. It goes without saying it is possible in the negative branch of the voltage divider to provide an NTC resistor.

Die vorliegende Anmeldung beschreibt einen speziellen Lösungsvorschlag.The present application describes a special one Proposed solution.

Der erfindungsgemäße Gedanke ist selbstverständlich nicht auf diesen einen Lösungsvorschlag beschränkt, sondern schließt andere denkbare Schaltungskonfigurationen ein, die den gleichen prinzipiellen Grundgedanken benutzen. The idea of the invention is self-evident not limited to this one solution, but closes other conceivable circuit configurations  one that has the same basic principle to use.  

Anlagen:Investments:

Fig. 1 - elektrisches Prinzipschaltbild Fig. 1 - electrical block diagram

Fig. 2 - Kennlinienfeld
Abhängigkeit der Sensorempfindlichkeit von der Heizspannung bei verschiedenen Gasen Fig. 2 - Characteristic field
Dependence of the sensor sensitivity on the heating voltage for different gases

Fig. 3 - Kennlinienfeld
Verlauf der unkorrigierten Sensorempfindlichkeitskurve bei komplexen Gasgemischen, z. B. Autoabgasen Fig. 3 - Characteristic field
Course of the uncorrected sensor sensitivity curve for complex gas mixtures, e.g. B. car exhaust

Fig. 4 - Kennlinien
Darstellung der Abhängigkeit des inneren Sensorwiderstandes bei CO = 20 ppm in Abhängigkeit von der absoluten Luftfeuchte. Fig. 4 - Characteristic curves
Representation of the dependency of the internal sensor resistance at CO = 20 ppm depending on the absolute air humidity.

Claims (4)

Anspruch 1
Sensor zum Zwecke der Schadstoffindikation für die Steuerung von Kraftfahrzeugkabinen, Arbeitsschutzkabinen und ähnlichen Anwendungen mit analoger Fehlerkompensation für Feuchte und Temperatur an Halbleiter- Gas-Sensoren dadurch gekennzeichnet, daß die Heizleistung in Abhängigkeit von der Lufttemperatur gesteuert wird.Claim 1
Sensor for the purpose of indicating pollutants for the control of motor vehicle cabins, occupational safety cabins and similar applications with analog error compensation for humidity and temperature on semiconductor gas sensors, characterized in that the heating power is controlled as a function of the air temperature. Anspruch 2
Apparat und Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der Sensor teil eines Ohm'schen Spannungsteilers ist.Claim 2
Apparatus and method according to claim 1, characterized in that the sensor is part of an ohmic voltage divider. Anspruch 3
Apparat und Verfahren nach Anspruch 1 und 2, dadurch gekennzeichnet, daß ein Teil des Spannungsteilers als temperaturabhängiger Widerstand ausgebildet ist. Claim 3
Apparatus and method according to Claims 1 and 2, characterized in that part of the voltage divider is designed as a temperature-dependent resistor. Anspruch 4
Apparat und Verfahren nach Anspruch 1 bis 3, dadurch gekennzeichnet, daß der Temperatureinfluß auf die Heizspannung und auf den im Anspruch 3 beschriebenen temperaturabhängigen Widerstand im Außenzweig so aufeinander abgestimmt sind, daß sie im Zusammenwirken mit dem Temperaturverhalten des verwendeten Sensors sich gegenseitig kompensieren.Claim 4
Apparatus and method according to claims 1 to 3, characterized in that the temperature influence on the heating voltage and on the temperature-dependent resistance described in claim 3 in the outer branch are coordinated with one another in such a way that they compensate one another in cooperation with the temperature behavior of the sensor used.
DE19853525115 1984-08-25 1985-07-13 Hazardous-material sensor for motor vehicles, working-protection cabs and other stressed spaces having analogous compensation for the influences of temperature and air humidity on semiconductor gas sensors Ceased DE3525115A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19853525115 DE3525115A1 (en) 1984-08-25 1985-07-13 Hazardous-material sensor for motor vehicles, working-protection cabs and other stressed spaces having analogous compensation for the influences of temperature and air humidity on semiconductor gas sensors

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19843431373 DE3431373A1 (en) 1984-08-25 1984-08-25 Pollutant sensor for motor vehicles, protective working cabins, etc.
DE19853525115 DE3525115A1 (en) 1984-08-25 1985-07-13 Hazardous-material sensor for motor vehicles, working-protection cabs and other stressed spaces having analogous compensation for the influences of temperature and air humidity on semiconductor gas sensors

Publications (1)

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DE3525115A1 true DE3525115A1 (en) 1987-01-22

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4882287A (en) * 1985-07-19 1989-11-21 Heinz Holter Process for indicating the presence of toxic substances in air that is supplied to a personnel-occupied space
US8359899B2 (en) * 2006-03-14 2013-01-29 Continental Automotive Gmbh Method for correcting the output signal of a lambda probe

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3014955A1 (en) * 1979-05-29 1980-12-11 Hewlett Packard Co TEMPERATURE STABILIZED CHAMBER, ESPECIALLY FOR A CRYSTAL OSCILLATOR
DE2836883B2 (en) * 1978-08-23 1981-07-16 Siemens AG, 1000 Berlin und 8000 München Device for temperature-controlled heating of probes
DE3134183A1 (en) * 1981-08-28 1983-03-17 Peter 8000 München Kersten Device for controlling the temperature of a heater (radiator)
DE3419694A1 (en) * 1983-05-27 1984-12-20 Transamerica Delaval Inc., Lawrenceville, N.J. ELECTRONIC DEVICE
DE3011525C2 (en) * 1979-03-29 1985-03-28 Vaisala Oy, Helsinki Control device for a humidity transmitter

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2836883B2 (en) * 1978-08-23 1981-07-16 Siemens AG, 1000 Berlin und 8000 München Device for temperature-controlled heating of probes
DE3011525C2 (en) * 1979-03-29 1985-03-28 Vaisala Oy, Helsinki Control device for a humidity transmitter
DE3014955A1 (en) * 1979-05-29 1980-12-11 Hewlett Packard Co TEMPERATURE STABILIZED CHAMBER, ESPECIALLY FOR A CRYSTAL OSCILLATOR
DE3134183A1 (en) * 1981-08-28 1983-03-17 Peter 8000 München Kersten Device for controlling the temperature of a heater (radiator)
DE3419694A1 (en) * 1983-05-27 1984-12-20 Transamerica Delaval Inc., Lawrenceville, N.J. ELECTRONIC DEVICE

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4882287A (en) * 1985-07-19 1989-11-21 Heinz Holter Process for indicating the presence of toxic substances in air that is supplied to a personnel-occupied space
US8359899B2 (en) * 2006-03-14 2013-01-29 Continental Automotive Gmbh Method for correcting the output signal of a lambda probe

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