WO2016005520A1 - Method, device, system, computer program, and computer program product for operating a nitrogen oxide sensor - Google Patents
Method, device, system, computer program, and computer program product for operating a nitrogen oxide sensor Download PDFInfo
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- WO2016005520A1 WO2016005520A1 PCT/EP2015/065749 EP2015065749W WO2016005520A1 WO 2016005520 A1 WO2016005520 A1 WO 2016005520A1 EP 2015065749 W EP2015065749 W EP 2015065749W WO 2016005520 A1 WO2016005520 A1 WO 2016005520A1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
- G01N33/0037—NOx
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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
- G01N27/416—Systems
- G01N27/417—Systems using cells, i.e. more than one cell and probes with solid electrolytes
- G01N27/419—Measuring voltages or currents with a combination of oxygen pumping cells and oxygen concentration cells
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Definitions
- the invention relates to a method, an apparatus, a system, a computer program and a computer program product for operating a nitrogen oxide sensor in an exhaust gas tract ei ⁇ nes vehicle.
- the object of the invention is to provide a method and an on ⁇ direction, is for operating a nitrogen oxide sensor so that permits operation of an internal combustion engine with very clotting ⁇ gen pollutant emissions.
- the object is solved by the features of the independent claims.
- Advantageous embodiments of the invention are characterized in the subclaims.
- the invention is characterized by a method and a corresponding device for operating a nitrogen oxide sensor ⁇ in an exhaust system of a vehicle.
- the nitrogen oxide ⁇ sensor is operated in a first control mode in which a measurement signal of the nitrogen oxide sensor is representative of a gas concentration of a first gas.
- the nitrogen oxide sensor is operated in a second drive mode that is different from the first drive mode in which a measurement signal of the nitrogen oxide sensor is representative of a gas concentration of a second gas that differs from the first gas in at least one chemical element.
- the invention is based on the finding that with a nitrogen oxide sensor, other gases can be detected. As a result, two different gases can be measured in a very simple and effective manner with only one sensor.
- the nitrogen oxide sensor is in particular a nitrogen oxide sensor having two or more than two chambers, for example, where a first pump current can be set in a first chamber such that interfering gases flow out again from the Stickoxidsen ⁇ sor, so that in a second chamber or extensive ⁇ ren chamber the gas to be measured can be measured. This is achieved, for example, by producing a constant partial pressure of the oxygen contained in the exhaust gas by applying the first pumping current. Furthermore, in the
- Nitrous oxide sensor for example, a second pumping current can be adjusted so that the gas to be measured in the second Chamber or another chamber is decomposed and in the second chamber or the other chamber, a current can be measured, which is proportional to the content of the measured Ga ⁇ ses in the exhaust gas and forms the measurement signal of the nitrogen oxide sensor.
- the second control mode differs from the ers ⁇ th driving mode in particular in that controlled variables of the nitrogen oxide sensor to be adjusted such as a pump current and / or voltage to be applied.
- controlled variables of the nitrogen oxide sensor such as a pump current and / or voltage to be applied.
- electrodes can be switched on in the individual chambers of the nitrogen oxide sensor or till ⁇ switches in the second driving mode.
- either the ers ⁇ te gas or the second gas is a nitric oxide.
- the determination of concentrations of nitrogen oxides is particularly important to ensure low-emission operation. For example, for operation of an SCR system (Selective Catalytic Reduction), it is important to be able to determine the O 2 concentration in order to detect catalyst malfunctions.
- either the first gas or the second gas is a chemical compound of Kohlenwas ⁇ hydrogen.
- hydrocarbons are particularly important to ensure low-emission operation.
- very stringent hydrocarbon limits are prescribed by future and / or applicable legal regulations, such as the European standard EURO-6 or the US standard SULEF.
- Such Koh ⁇ bons for example, ethene and / or ethane and / or ethyne and / or propene and / or propane.
- Hydrocarbons alternatively or additionally include gases such as long-chain C 8 H X and / or C 2 H x.
- either the first gas or the second gas is a chemical compound of carbon and oxygen.
- concentrations of compounds of carbon and oxygen are important to ensure a low-emission operation.
- the invention is characterized by a system comprising the device for operating the
- Nitrogen sensor and the nitrogen oxide sensor are Nitrogen sensor and the nitrogen oxide sensor.
- the invention features a computer program, wherein the computer program is adapted to perform the method for operating of the nitrogen oxide sensor, or an advantageous embodiment of the method for operating of the nitrogen oxide sensor on a Da ⁇ ten kausvorraum.
- the invention is characterized by a computer program product comprising an executable program code, wherein the program code executes the method for operating the nitrogen oxide sensor or an advantageous Ausges ⁇ staltung of the method for operating the nitrogen oxide sensor when executed by a data processing device.
- the computer program product comprises a medium which can be read by the data processing device and on which the program code is stored.
- FIG. 1 shows a nitrogen oxide sensor and FIG. 2 shows a flow chart for operating a nitrogen oxide sensor .
- 1 shows a nitrogen oxide sensor 1.
- the sensor 1 is nitric oxide, especially in an exhaust gas duct of a vehicle angeord ⁇ net.
- the nitrogen oxide sensor 1 has, for example, an inlet 5 through which exhaust gas can flow into a first chamber 7.
- the nitrogen oxide sensor 1 has a first diffusi ⁇ onspfad 11 and a second chamber 9, and a second diffusion path 13 further may have the nitrogen oxide sensor 1 wei ⁇ tere chambers and further diffusion paths.
- the nitrogen oxide sensor 1 comprises in particular a pump chamber for each electrode, it includes a first pump electrode 15 and the second chamber 9 a two ⁇ te pump electrode 17 for the first chamber 7.
- first chamber 7 and the second chamber 9 individually or for both chambers together a mass ⁇ electrode 19. Furthermore, in the first chamber 7, a reference electrode
- the nitrogen oxide sensor 1 has a heating element 25.
- a first pumping current in the first chamber 7 can be adjusted by means of the first pumping electrode 15 and the grounding electrode 19 such that disturbing gases flow out of the inlet 5 again, so that the gas content of the gas to be measured can be measured in the second chamber 9 passes through the first diffusion path 11 into the second chamber 9.
- This is achieved, for example, by gene of the first pumping current, a constant partial pressure of the oxygen contained in the exhaust gas is produced.
- the first pump current is for example inversely proportional to the air ⁇ fuel ratio.
- the second pump electrode 17 and the ground electrode 19 may be, for example, a second pumping current is such ⁇ assumed that the gas to be measured is decomposed in the second chamber.
- a current is measured at the measuring electrode 23, which is propor tional to ⁇ the measured gas content in the exhaust gas. This current forms the measurement signal of the nitrogen oxide sensor.
- a control device 50 is adapted to run the stick ⁇ oxide sensor 1, in particular the first and the second pump electrode 15 to drive the 17th
- the Steuervorrich ⁇ device 50 has for this purpose in particular a computing unit, a program and data storage, as well as, for example, one or more communication interfaces.
- the control device 50 can also serve as device for loading ⁇ drive a nitrogen oxide sensor 1 are designated.
- control device 50 On the data and program memory of the control device 50 is in particular a program for operating the
- Nitrogen sensors 1 stored.
- FIG. 2 shows a flow diagram of the program for operating the nitrogen oxide sensor 1.
- the program is started in a step S1, in which variables can be initialized if necessary.
- the nitrogen oxide sensor 1 is operated in a ⁇ ers th driving mode in which a measurement signal of the nitrogen oxide sensor 1 is representative of a Gaskonzentrati ⁇ on a first gas.
- the nitrogen oxide sensor 1 is operated in a two ⁇ th drive mode, which differs from the first on ⁇ control mode in which a measurement signal of the nitrogen oxide sensor 1 is representative of a gas concentration of a second gas, at least in a chemi ⁇ element different from the first gas.
- a step S7 the program is terminated and can gege ⁇ appropriate, be started in the step Sl again.
- the program can also recover in the step S3 fortge ⁇ sets.
- the first gas or the second gas is, for example, a nitrogen oxide.
- either the first gas or the second gas is a chemical compound of carbon ⁇ hydrogen.
- either the ers ⁇ te gas or the second gas is a chemical compound of Koh ⁇ lenstoff and oxygen. This can help to ensure that with only one
- the concentrations of several different gases can be he ⁇ averages.
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Abstract
Description
Beschreibung description
Verfahren, Vorrichtung, System, Computerprogramm und Compu¬ terprogrammprodukt zum Betreiben eines Stickoxidsensors A method, apparatus, system, computer program and Compu ¬ program product for operating a nitrogen oxide sensor
Die Erfindung betrifft ein Verfahren, eine Vorrichtung, ein System, ein Computerprogramm und ein Computerprogrammprodukt zum Betreiben eines Stickoxidsensors in einem Abgastrakt ei¬ nes Fahrzeuges. The invention relates to a method, an apparatus, a system, a computer program and a computer program product for operating a nitrogen oxide sensor in an exhaust gas tract ei ¬ nes vehicle.
Immer strengere gesetzliche Vorschriften bezüglich zulässiger Schadstoffemissionen in Kraftfahrzeugen, in denen Brennkraft¬ maschinen angeordnet sind, machen es erforderlich, die Schad¬ stoffemissionen bei einem Betrieb der Brennkraftmaschine so gering wie möglich zu halten. Hierdurch ist es insbesondere für den Einsatz von Abgasnachbehandlungssystemen, wie Kataly¬ satoren, erforderlich die Schadstoffkomponenten im Abgastrakt sehr genau zu bestimmen. Zur Bestimmung des Stickoxidgehalts im Abgas werden insbeson¬ dere Stickoxidsensoren eingesetzt. Increasingly strict legal requirements regarding permissible pollutant emissions in automobiles, in which internal combustion ¬ machines are arranged, make it necessary for the damaged ¬ emissions to be kept as low as possible during operation of the internal combustion engine. This makes it particularly for the use of exhaust aftertreatment systems, such as cata ¬ sators, required to determine the pollutant components in the exhaust system very accurately. To determine the nitrogen oxide content in the exhaust insbeson ¬ particular nitrogen oxide sensors.
Aus dem Fachbuch „Handbuch Verbrennungsmotoren", Herausgeber Richard von Basshuysen/Fred Schäfer, 2. Auflage, Juni 2002, Friedrich Vieweg & Sohn Verlagsgesellschaft mbH Braunschweig/ Wiesbaden, Seite 589 ff., ist ein Stickoxidsensor auf der Ba¬ sis von ZrC>2 Keramik bekannt, der zwei Kammern aufweist. In der ersten Kammer wird durch Anlegen eines Pumpstroms ein konstanter Partialdruck des im Abgas enthaltenen Sauerstoffs hergestellt. Der Pumpstrom ist umgekehrt proportional zumFrom the book "Handbook combustion engines", edited by Richard von Basshuysen / Fred Schafer, 2nd edition, June 2002, Friedrich Vieweg & Sohn Verlagsgesellschaft mbH Braunschweig / Wiesbaden, page 589 et seq., A nitrogen oxide sensor on the Ba ¬ sis of ZrC> 2 In the first chamber, a constant partial pressure of the oxygen contained in the exhaust gas is produced by applying a pumping current
LuftkraftStoffVerhältnis . In der zweiten Kammer wird das im Abgas enthaltene Stickoxid durch Anlegen eines weiteren Air-fuel ratio. In the second chamber, the nitrogen oxide contained in the exhaust gas by applying another
Stroms zersetzt. Hieraufhin kann an einer Messelektrode in der zweiten Kammer ein Strom gemessen werden, der proportio- nal zum Stickoxidgehalt im Abgas ist und der das Messsignal des Stickoxidsensors bildet. Die Aufgabe der Erfindung ist es, ein Verfahren und eine Vor¬ richtung zu schaffen, zum Betreiben eines Stickoxidsensors, so dass ein Betrieb einer Brennkraftmaschine mit sehr gerin¬ gen Schadstoffemissionen ermöglicht wird. Strom decomposes. Following this, a current which is proportional to the nitrogen oxide content in the exhaust gas and forms the measurement signal of the nitrogen oxide sensor can be measured at a measuring electrode in the second chamber. The object of the invention is to provide a method and an on ¬ direction, is for operating a nitrogen oxide sensor so that permits operation of an internal combustion engine with very clotting ¬ gen pollutant emissions.
Die Aufgabe wird gelöst durch die Merkmale der unabhängigen Patentansprüche. Vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen gekennzeichnet. Die Erfindung zeichnet sich aus durch ein Verfahren und eine korrespondierende Vorrichtung zum Betreiben eines Stickoxid¬ sensors in einem Abgastrakt eines Fahrzeugs. Der Stickoxid¬ sensor wird in einem ersten Ansteuerungsmodus betrieben, in dem ein Messsignal des Stickoxidsensors repräsentativ ist für eine Gaskonzentration eines ersten Gases. Der Stickoxidsensor wird in einem zweiten Ansteuerungsmodus betrieben, der sich von dem ersten Ansteuerungsmodus unterscheidet, in dem ein Messsignal des Stickoxidsensors repräsentativ ist für eine Gaskonzentration eines zweiten Gases, das sich zumindest in einem chemischen Element von dem ersten Gas unterscheidet. The object is solved by the features of the independent claims. Advantageous embodiments of the invention are characterized in the subclaims. The invention is characterized by a method and a corresponding device for operating a nitrogen oxide sensor ¬ in an exhaust system of a vehicle. The nitrogen oxide ¬ sensor is operated in a first control mode in which a measurement signal of the nitrogen oxide sensor is representative of a gas concentration of a first gas. The nitrogen oxide sensor is operated in a second drive mode that is different from the first drive mode in which a measurement signal of the nitrogen oxide sensor is representative of a gas concentration of a second gas that differs from the first gas in at least one chemical element.
Der Erfindung liegt die Erkenntnis zugrunde, dass mit einem Stickoxidsensor auch andere Gase detektiert werden können. Hierdurch können auf sehr einfache und effektive Weise mit nur einem Sensor zwei unterschiedliche Gase gemessen werden. The invention is based on the finding that with a nitrogen oxide sensor, other gases can be detected. As a result, two different gases can be measured in a very simple and effective manner with only one sensor.
Der Stickoxidsensor ist insbesondere ein Stickoxidsensor mit zwei oder mehr als zwei Kammern, bei dem beispielsweise ein erster Pumpstrom in einer ersten Kammer derart eingestellt werden kann, dass störende Gase wieder aus dem Stickoxidsen¬ sor herausströmen, sodass in einer zweiten Kammer oder weite¬ ren Kammer das zu messende Gas gemessen werden kann. Dies wird beispielsweise erreicht, indem durch Anlegen des ersten Pumpstroms ein konstanter Partialdruck des im Abgas enthalte- nen Sauerstoffs hergestellt wird. Weiterhin kann bei demThe nitrogen oxide sensor is in particular a nitrogen oxide sensor having two or more than two chambers, for example, where a first pump current can be set in a first chamber such that interfering gases flow out again from the Stickoxidsen ¬ sor, so that in a second chamber or extensive ¬ ren chamber the gas to be measured can be measured. This is achieved, for example, by producing a constant partial pressure of the oxygen contained in the exhaust gas by applying the first pumping current. Furthermore, in the
Stickoxidsensor beispielsweise ein zweiter Pumpstrom derart eingestellt werden, dass das zu messende Gas in der zweiten Kammer oder einer weiteren Kammer zersetzt wird und in der zweiten Kammer oder der weiteren Kammer ein Strom gemessen werden kann, der proportional zum Gehalt des zu messenden Ga¬ ses im Abgas ist und der das Messsignal des Stickoxidsensors bildet. Nitrous oxide sensor, for example, a second pumping current can be adjusted so that the gas to be measured in the second Chamber or another chamber is decomposed and in the second chamber or the other chamber, a current can be measured, which is proportional to the content of the measured Ga ¬ ses in the exhaust gas and forms the measurement signal of the nitrogen oxide sensor.
Der zweite Ansteuerungsmodus unterscheidet sich von dem ers¬ ten Ansteuerungsmodus insbesondere dadurch, dass Regelgrößen des Stickoxidsensors angepasst werden, wie beispielsweise ein Pumpstrom und/oder eine anzulegende Spannung. Alternativ oder zusätzlich können in den zweiten Ansteuerungsmodus Elektroden in den einzelnen Kammern des Stickoxidsensor zu- oder abge¬ schaltet werden. Gemäß einer vorteilhaften Ausgestaltung ist entweder das ers¬ te Gas oder das zweite Gas ein Stickoxid. The second control mode differs from the ers ¬ th driving mode in particular in that controlled variables of the nitrogen oxide sensor to be adjusted such as a pump current and / or voltage to be applied. Alternatively or additionally, electrodes can be switched on in the individual chambers of the nitrogen oxide sensor or abge ¬ switches in the second driving mode. According to an advantageous embodiment, either the ers ¬ te gas or the second gas is a nitric oxide.
Gerade das Ermitteln von Konzentrationen von Stickoxiden ist besonders wichtig um eine emissionsarmen Betrieb zu gewähr- leisten. Beispielsweise für einen Betrieb eines SCR-System (Selektive katalytische Reduktion) ist es wichtig die O2 Konzentration ermitteln zu können, um Fehlfunktionen eines Katalysators zu ermitteln. Gemäß einer weiteren Ausgestaltung ist entweder das erste Gas oder das zweite Gas eine chemische Verbindung aus Kohlenwas¬ serstoff . The determination of concentrations of nitrogen oxides is particularly important to ensure low-emission operation. For example, for operation of an SCR system (Selective Catalytic Reduction), it is important to be able to determine the O 2 concentration in order to detect catalyst malfunctions. According to a further embodiment, either the first gas or the second gas is a chemical compound of Kohlenwas ¬ hydrogen.
Gerade Kohlenwasserstoffe sind besonders wichtig um eine emissionsarmen Betrieb zu gewährleisten. So sind insbesondere durch zukünftige und/oder geltende gesetzliche Vorschriften, wie der Europäischen Norm EURO-6 oder der US-Norm SULEF, sehr strenge Kohlenwasserstoffgrenzen vorgegeben. Derartige Koh¬ lenwasserstoffe umfassen beispielsweise Ethen und/oder Ethan und/oder Ethin und/oder Propen und/oder Propan. DerartigeEspecially hydrocarbons are particularly important to ensure low-emission operation. For example, very stringent hydrocarbon limits are prescribed by future and / or applicable legal regulations, such as the European standard EURO-6 or the US standard SULEF. Such Koh ¬ bons, for example, ethene and / or ethane and / or ethyne and / or propene and / or propane. such
Kohlenwasserstoffe umfassen alternativ oder zusätzlich auch längerkettige Gase wie C8HX und/oder Ci2Hx. Gemäß einer weiteren vorteilhaften Ausgestaltung ist entweder das erste Gas oder das zweite Gas eine chemische Verbindung aus Kohlenstoff und Sauerstoff. Hydrocarbons alternatively or additionally include gases such as long-chain C 8 H X and / or C 2 H x. According to a further advantageous embodiment, either the first gas or the second gas is a chemical compound of carbon and oxygen.
Auch die Ermittlung von Konzentrationen von Verbindungen aus Kohlenstoff und Sauerstoff, wie zum Beispiel CO und/oder CO2, sind wichtig um einen emissionsarmen Betrieb zu gewährleis- ten . The determination of concentrations of compounds of carbon and oxygen, such as CO and / or CO 2 , are important to ensure a low-emission operation.
Gemäß einem weiteren Aspekt zeichnet sich die Erfindung aus durch ein System, das die Vorrichtung zum Betreiben des According to a further aspect, the invention is characterized by a system comprising the device for operating the
Stickoxidsensors aufweist und den Stickoxidsensor. Nitrogen sensor and the nitrogen oxide sensor.
Gemäß einer weiteren vorteilhaften Ausgestaltung zeichnet sich die Erfindung aus durch ein Computerprogramm, wobei das Computerprogramm ausgebildet ist, das Verfahren zum Betreiben des Stickoxidsensors oder eine vorteilhafte Ausgestaltung des Verfahrens zum Betreiben des Stickoxidsensors auf einer Da¬ tenverarbeitungsvorrichtung durchzuführen . According to a further advantageous embodiment, the invention features a computer program, wherein the computer program is adapted to perform the method for operating of the nitrogen oxide sensor, or an advantageous embodiment of the method for operating of the nitrogen oxide sensor on a Da ¬ tenverarbeitungsvorrichtung.
Gemäß einem weiteren Aspekt zeichnet sich die Erfindung aus durch ein Computerprogrammprodukt, das einen ausführbaren Programmcode umfasst, wobei der Programmcode bei Ausführung durch eine Datenverarbeitungsvorrichtung das Verfahren zum Betreiben des Stickoxidsensors oder eine vorteilhafte Ausges¬ taltung des Verfahrens zum Betreiben des Stickoxidsensors ausführt . According to a further aspect, the invention is characterized by a computer program product comprising an executable program code, wherein the program code executes the method for operating the nitrogen oxide sensor or an advantageous Ausges ¬ staltung of the method for operating the nitrogen oxide sensor when executed by a data processing device.
Das Computerprogrammprodukt umfasst insbesondere ein von der Datenverarbeitungsvorrichtung lesbares Medium, auf dem der Programmcode gespeichert ist. In particular, the computer program product comprises a medium which can be read by the data processing device and on which the program code is stored.
Ausführungsbeispiele der Erfindung sind im Folgenden anhand der schematischen Zeichnungen näher erläutert. Es zeigen: Embodiments of the invention are explained in more detail below with reference to the schematic drawings. Show it:
Figur 1 einen Stickoxidsensor und Figur 2 ein Ablaufdiagramm zum Betreiben eines Stickoxid¬ sensors . Figur 1 zeigt einen Stickoxidsensor 1. Der Stickoxidsensor 1 ist insbesondere in einem Abgastrakt eines Fahrzeugs angeord¬ net . FIG. 1 shows a nitrogen oxide sensor and FIG. 2 shows a flow chart for operating a nitrogen oxide sensor . 1 shows a nitrogen oxide sensor 1. The sensor 1 is nitric oxide, especially in an exhaust gas duct of a vehicle angeord ¬ net.
Der Stickoxidsensor 1 weist beispielsweise einen Einlass 5 auf, durch den Abgas in eine erste Kammer 7 strömen kann.The nitrogen oxide sensor 1 has, for example, an inlet 5 through which exhaust gas can flow into a first chamber 7.
Weiterhin weist der Stickoxidsensor 1 einen ersten Diffusi¬ onspfad 11 auf und eine zweite Kammer 9, sowie einen zweiten Diffusionspfad 13. Weiterhin kann der Stickoxidsensor 1 wei¬ tere Kammern und weitere Diffusionspfade aufweisen. Furthermore, the nitrogen oxide sensor 1 has a first diffusi ¬ onspfad 11 and a second chamber 9, and a second diffusion path 13 further may have the nitrogen oxide sensor 1 wei ¬ tere chambers and further diffusion paths.
Der Stickoxidsensor 1 weist insbesondere für jede Kammer eine Pumpelektrode auf, so weist er für die erste Kammer 7 eine erste Pumpelektrode 15 und für die zweite Kammer 9 eine zwei¬ te Pumpelektrode 17 auf. The nitrogen oxide sensor 1 comprises in particular a pump chamber for each electrode, it includes a first pump electrode 15 and the second chamber 9 a two ¬ te pump electrode 17 for the first chamber 7.
Zusätzlich weist er für die erste Kammer 7 und die zweite Kammer 9 einzeln oder für beide Kammern gemeinsam eine Masse¬ elektrode 19 auf. Weiterhin ist in der ersten Kammer 7 eine ReferenzelektrodeIn addition, it has for the first chamber 7 and the second chamber 9 individually or for both chambers together a mass ¬ electrode 19. Furthermore, in the first chamber 7, a reference electrode
21 und in der zweiten Kammer 9 eine Messelektrode 23 angeord¬ net . 21 and in the second chamber 9, a measuring electrode 23 angeord ¬ net.
Weiterhin weist der Stickoxidsensor 1 ein Heizelement 25 auf. Furthermore, the nitrogen oxide sensor 1 has a heating element 25.
Mittels der ersten Pumpelektrode 15 und der Masseelektrode 19 kann beispielsweise ein erster Pumpstrom in der ersten Kammer 7 derart eingestellt werden, dass störende Gase wieder aus dem Einlass 5 herausströmen, sodass in der zweiten Kammer 9 das Gasgehalt des zu messenden Gases gemessen werden kann, das durch den ersten Diffusionspfad 11 in die zweite Kammer 9 gelangt. Dies wird beispielsweise erreicht, indem durch Anle- gen des ersten Pumpstroms ein konstanter Partialdruck des im Abgas enthaltenen Sauerstoffs hergestellt wird. Der erste Pumpstrom ist beispielsweise umgekehrt proportional zum Luft¬ kraftStoffVerhältnis . By way of example, a first pumping current in the first chamber 7 can be adjusted by means of the first pumping electrode 15 and the grounding electrode 19 such that disturbing gases flow out of the inlet 5 again, so that the gas content of the gas to be measured can be measured in the second chamber 9 passes through the first diffusion path 11 into the second chamber 9. This is achieved, for example, by gene of the first pumping current, a constant partial pressure of the oxygen contained in the exhaust gas is produced. The first pump current is for example inversely proportional to the air ¬ fuel ratio.
Mittels der zweiten Pumpelektrode 17 und der Masseelektrode 19 kann beispielsweise ein zweiter Pumpstrom derart einge¬ stellt werden, dass das zu messende Gas in der zweiten Kammer 9 zersetzt wird. By means of the second pump electrode 17 and the ground electrode 19 may be, for example, a second pumping current is such ¬ assumed that the gas to be measured is decomposed in the second chamber. 9
An der Messelektrode 23 wird ein Strom gemessen, der propor¬ tional zu dem zu messenden Gasgehalt im Abgas ist. Dieser Strom bildet das Messsignal des Stickoxidsensors. Eine Steuervorrichtung 50 ist dazu ausgebildet, den Stick¬ oxidsensor 1 zu betreiben, insbesondere die erste und die zweite Pumpelektrode 15, 17 anzusteuern. Die Steuervorrich¬ tung 50 weist hierfür insbesondere eine Recheneinheit, einen Programm- und Datenspeicher, sowie beispielsweise eine oder mehrere Kommunikationsschnittstellen auf. Der Programm- und Datenspeicher und/oder die Recheneinheit und/oder die Kommu¬ nikationsschnittstellen können in einer Baueinheit und/oder verteilt auf mehrere Baueinheiten ausgebildet sein. Die Steuervorrichtung 50 kann auch als Vorrichtung zum Be¬ treiben eines Stickoxidsensors 1 bezeichnet werden. A current is measured at the measuring electrode 23, which is propor tional to ¬ the measured gas content in the exhaust gas. This current forms the measurement signal of the nitrogen oxide sensor. A control device 50 is adapted to run the stick ¬ oxide sensor 1, in particular the first and the second pump electrode 15 to drive the 17th The Steuervorrich ¬ device 50 has for this purpose in particular a computing unit, a program and data storage, as well as, for example, one or more communication interfaces. The program and data memory and / or computing unit and / or which may Kommu terfaces ¬ in one structural unit and / or distributed to be formed on a plurality of building units. The control device 50 can also serve as device for loading ¬ drive a nitrogen oxide sensor 1 are designated.
Auf dem Daten- und Programmspeicher der Steuervorrichtung 50 ist hierfür insbesondere ein Programm zum Betreiben des On the data and program memory of the control device 50 is in particular a program for operating the
Stickoxidsensors 1 gespeichert. Nitrogen sensors 1 stored.
Figur 2 zeigt ein Ablaufdiagramm des Programms zum Betreiben des Stickoxidsensors 1. Das Programm wird in einem Schritt Sl gestartet, in dem gegebenenfalls Variablen initialisiert wer- den können. In einem Schritt S3 wird der Stickoxidsensor 1 in einem ers¬ ten Ansteuerungsmodus betrieben, in dem ein Messsignal des Stickoxidsensors 1 repräsentativ ist für eine Gaskonzentrati¬ on eines ersten Gases. FIG. 2 shows a flow diagram of the program for operating the nitrogen oxide sensor 1. The program is started in a step S1, in which variables can be initialized if necessary. In a step S3, the nitrogen oxide sensor 1 is operated in a ¬ ers th driving mode in which a measurement signal of the nitrogen oxide sensor 1 is representative of a Gaskonzentrati ¬ on a first gas.
In einem Schritt S5 wird der Stickoxidsensor 1 in einem zwei¬ ten Ansteuerungsmodus betrieben, der sich von dem ersten An¬ steuerungsmodus unterscheidet, in dem ein Messsignal des Stickoxidsensors 1 repräsentativ ist für eine Gaskonzentrati- on eines zweiten Gases, das sich zumindest in einem chemi¬ schen Element von dem ersten Gas unterscheidet. In a step S5, the nitrogen oxide sensor 1 is operated in a two ¬ th drive mode, which differs from the first on ¬ control mode in which a measurement signal of the nitrogen oxide sensor 1 is representative of a gas concentration of a second gas, at least in a chemi ¬ element different from the first gas.
In einem Schritt S7 wird das Programm beendet und kann gege¬ benenfalls wieder in dem Schritt Sl gestartet werden. Alter- nativ kann das Programm auch wieder in dem Schritt S3 fortge¬ setzt werden. In a step S7, the program is terminated and can gege ¬ appropriate, be started in the step Sl again. As an alternative, the program can also recover in the step S3 fortge ¬ sets.
Das erste Gas oder das zweite Gas ist beispielsweise ein Stickoxid. Alternativ oder zusätzlich ist entweder das erste Gas oder das zweite Gas eine chemische Verbindung aus Kohlen¬ wasserstoff. Alternativ oder zusätzlich ist entweder das ers¬ te Gas oder das zweite Gas eine chemische Verbindung aus Koh¬ lenstoff und Sauerstoff. Hierdurch kann dazu beigetragen werden, dass mit nur einemThe first gas or the second gas is, for example, a nitrogen oxide. Alternatively or additionally, either the first gas or the second gas is a chemical compound of carbon ¬ hydrogen. Alternatively or additionally, either the ers ¬ te gas or the second gas is a chemical compound of Koh ¬ lenstoff and oxygen. This can help to ensure that with only one
Sensor die Konzentrationen von mehreren verschieden Gasen er¬ mittelt werden können. Sensor, the concentrations of several different gases can be he ¬ averages.
Claims
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| DE102014213484.6 | 2014-07-10 | ||
| DE102014213484.6A DE102014213484A1 (en) | 2014-07-10 | 2014-07-10 | A method, apparatus, system, computer program and computer program product for operating a nitrogen oxide sensor |
Publications (1)
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| WO2016005520A1 true WO2016005520A1 (en) | 2016-01-14 |
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| PCT/EP2015/065749 Ceased WO2016005520A1 (en) | 2014-07-10 | 2015-07-09 | Method, device, system, computer program, and computer program product for operating a nitrogen oxide sensor |
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| WO (1) | WO2016005520A1 (en) |
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| CN109416341A (en) * | 2016-06-23 | 2019-03-01 | 日本碍子株式会社 | The method for measurement of concentration of multiple target components in gas sensor and measured gas |
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| WO2017207208A1 (en) * | 2016-05-31 | 2017-12-07 | Continental Automotive Gmbh | Method, device for operating a nitrogen oxide sensor, computer program, and computer program product |
| CN109196346A (en) * | 2016-05-31 | 2019-01-11 | 大陆汽车有限公司 | Method, apparatus, computer program and computer program product for operating a nitrogen oxide sensor |
| KR20190010586A (en) * | 2016-05-31 | 2019-01-30 | 콘티넨탈 오토모티브 게엠베하 | Method, device, computer program and computer program product for operating a nitrogen oxide sensor |
| CN109196346B (en) * | 2016-05-31 | 2020-11-10 | 大陆汽车有限公司 | Method, apparatus, computer program and computer program product for operating a nitrogen oxide sensor |
| KR102202761B1 (en) * | 2016-05-31 | 2021-01-13 | 콘티넨탈 오토모티브 게엠베하 | Method, device, computer program and recording medium for operating nitric oxide sensor |
| US11125718B2 (en) | 2016-05-31 | 2021-09-21 | Vitesco Technologies GmbH | Method and device for operating a nitrogen oxide sensor |
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| US11249045B2 (en) | 2016-06-23 | 2022-02-15 | Ngk Insulators, Ltd. | Gas sensor, and method for measuring concentrations of plurality of target components in gas to be measured |
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| DE102014213484A1 (en) | 2016-01-28 |
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