DE102009046331A1 - Device for determining temperature profile of e.g. particulate filter in exhaust gas duct of internal-combustion engine of motor vehicle, has tap provided between elements of thermoelectric generator to determine electrical voltage - Google Patents
Device for determining temperature profile of e.g. particulate filter in exhaust gas duct of internal-combustion engine of motor vehicle, has tap provided between elements of thermoelectric generator to determine electrical voltage Download PDFInfo
- Publication number
- DE102009046331A1 DE102009046331A1 DE102009046331A DE102009046331A DE102009046331A1 DE 102009046331 A1 DE102009046331 A1 DE 102009046331A1 DE 102009046331 A DE102009046331 A DE 102009046331A DE 102009046331 A DE102009046331 A DE 102009046331A DE 102009046331 A1 DE102009046331 A1 DE 102009046331A1
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- Germany
- Prior art keywords
- thermoelectric generator
- exhaust gas
- thermoelectric
- elements
- temperature profile
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- 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.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
- F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
- F02G5/00—Profiting from waste heat of combustion engines, not otherwise provided for
- F02G5/02—Profiting from waste heat of exhaust gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/06—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a temperature sensor
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
Description
Die Erfindung betrifft eine Vorrichtung zur Bestimmung eines Temperaturprofils in einer Abgasreinigungsanlage in einem Abgaskanal einer Brennkraftmaschine, wobei an der Abgasreinigunganlage ein aus mehreren in Serie geschalteten thermoelektrischen Elementen bestehender thermoelektrischer Generator angebracht ist.The invention relates to a device for determining a temperature profile in an exhaust gas purification system in an exhaust passage of an internal combustion engine, wherein on the exhaust gas purification system consisting of a plurality of series-connected thermoelectric elements existing thermoelectric generator.
Stand der TechnikState of the art
Abgasreinigungsanlagen für Brennkraftmaschinen für Kraftfahrzeuge dienen der katalytischen Umsetzung unerwünschter gasförmiger Bestandteile oder der Rückhaltung fester Partikel im Abgas, wobei diese Partikelfilter bei Bedarf freigebrannt werden müssen. In beiden Fällen ist eine gewisse Mindest-Temperatur zur bestimmungsgemäßen Funktion erforderlich. Andererseits dürfen materialabhängige Höchst-Temperaturen nicht überschritten werden, um die Lebensdauer des Bauteils nicht zu beeinträchtigen. Es ist daher erforderlich, die Temperatur der Bauteile im Betrieb zu überwachen. Nach dem Stand der Technik werden hierzu ein oder mehrere Temperaturfühler an der Abgasreinigungsanlage angebracht.Exhaust gas purification systems for internal combustion engines for motor vehicles are used for the catalytic conversion of unwanted gaseous components or the retention of solid particles in the exhaust gas, these particulate filters must be burned if necessary. In both cases, a certain minimum temperature for proper function is required. On the other hand, material-dependent maximum temperatures must not be exceeded in order not to impair the service life of the component. It is therefore necessary to monitor the temperature of the components during operation. According to the prior art, one or more temperature sensors are attached to the exhaust gas purification system for this purpose.
Im Rahmen einer Verbesserung der Nutzung der Energie der Brennstoffe für Kraftfahrzeuge wird eine Nutzung der in den heißen Abgasen enthaltenen Energie angestrebt. Eine Option sind thermoelektrische Generatoren, die an Bauteilen im Abgaskanal der Brennkraftmaschinen angebracht werden. Thermoelektrische Generatoren nutzen die Erzeugung von Spannungsdifferenzen aufgrund des Seebeck-Effekts an Halbleitermaterialien wie Bi2Te3, PbTe, SiGe, BiSb, FeSi2 wenn zwei Bereiche eines Körpers aus einem solchen Halbleitermaterials unterschiedlichen Temperaturen haben. Bei vorgegebener Temperaturdifferenz hängt die Spannungsdifferenz dabei vom Seebeck-Koeffizienten des Materials ab, der durch dotieren des Halbleitermaterials beeinflusst werden kann. Zur Erreichung praktisch nutzbarer Spannungen werden thermoelektrische Elemente in einem thermoelektrischen Generator in Serie geschaltet. Hierbei werden abwechselnd p-dotierte und n-dotierte Materialien für die Elemente verwendet, so dass sich die Spannungen addieren. Die an einem thermoelektrischen Element auftretenden Spannung ist weitgehend proportional zur Temperaturdifferenz zwischen dessen Enden.As part of an improvement in the use of energy from fuels for motor vehicles, the aim is to use the energy contained in the hot exhaust gases. One option is thermoelectric generators, which are attached to components in the exhaust passage of the internal combustion engine. Thermoelectric generators use the generation of voltage differences due to the Seebeck effect on semiconductor materials such as Bi 2 Te 3 , PbTe, SiGe, BiSb, FeSi 2 when two regions of a body of such a semiconductor material have different temperatures. At a given temperature difference, the voltage difference depends on the Seebeck coefficient of the material, which can be influenced by doping the semiconductor material. To achieve practically usable voltages, thermoelectric elements in a thermoelectric generator are connected in series. In this case, alternately p-doped and n-doped materials are used for the elements, so that the voltages add up. The voltage occurring at a thermoelectric element is largely proportional to the temperature difference between its ends.
Nachteilig bei den bekannten Vorrichtungen ist, dass Temperaturfühler eingesetzt werden, die zusätzliche Kosten verursachen.A disadvantage of the known devices is that temperature sensors are used, which cause additional costs.
Es ist Aufgabe der Erfindung, eine Vorrichtung bereitzustellen, mit welcher die Temperatur in einer Abgasreinigungsanlage während des Betriebs überwacht werden kann.It is an object of the invention to provide a device with which the temperature in an exhaust gas purification system can be monitored during operation.
Offenbarung der ErfindungDisclosure of the invention
Die die Vorrichtung betreffende Aufgabe der Erfindung wird dadurch gelöst, dass zwischen zumindest zwei Elementen des thermoelektrischen Generators ein Abgriff zur Bestimmung einer elektrischen Spannung vorgesehen ist. Da die von einem thermoelektrischen Element erzeugte Spannung weitgehend proportional der Temperaturdifferenz über dem Element ist, kann über die Spannungsabgriffe das Temperaturprofil in Längsrichtung der Abgasreinigungsanlage bestimmt werden, wenn der thermoelektrische Generator entsprechend angeordnet ist. Der Spannungsabgriff erfolgt dabei hochohmig im Vergleich zum Innenwiderstand der thermoelektrischen Elemente um die Spannungsbestimmung nicht zu verfälschen. In einer vereinfachten Ausführung können nur die von außen auf der kalten Seite angebrachten Verbindungen zwischen den thermoelektrischen Elementen mit Abgriffen versehen sein. Hierdurch wird zwar die Ortsauflösung halbiert, andererseits wird aber eine Kontaktierung und eine Führung von Leitern im Heißbereich des thermoelektrischen Generators vermieden. Es ist somit ohne zusätzliche Vorrichtungen möglich, das Temperaturprofil der Abgasreinigungsanlage zu bestimmen; Zusatzkosten können somit vermieden werden.The object of the invention relating to the device is achieved in that a tap for determining an electrical voltage is provided between at least two elements of the thermoelectric generator. Since the voltage generated by a thermoelectric element is largely proportional to the temperature difference across the element, the temperature profile in the longitudinal direction of the emission control system can be determined via the voltage taps, if the thermoelectric generator is arranged accordingly. The voltage tap is thereby high impedance compared to the internal resistance of the thermoelectric elements in order not to falsify the voltage determination. In a simplified embodiment, only the externally mounted on the cold side connections between the thermoelectric elements can be provided with taps. As a result, although the spatial resolution is halved, but on the other hand, a contact and a leadership of conductors in the hot region of the thermoelectric generator is avoided. It is thus possible without additional devices to determine the temperature profile of the emission control system; Additional costs can be avoided.
Sind zumindest ein Teil der thermoelektrischen Elemente zu einem Teil im Innern der Abgasreinigungsanlage angeordnet, entspricht deren Temperatur am heißen Ende sehr genau der zu überwachenden Temperatur. Bei einem intakten Katalysator mit einer hohen Konvertierungsrate stellt sich unter sonst gleichen Randbedingungen wie Abgaszusammensetzung, Temperatur des Abgases beim Eintritt in die Abgasreinigungsanlage und Abgasmenge eine höhere Temperatur ein als bei einem bereits zonenweise geschädigten Katalysator. Im Falle eines Partikelfilters können beim Freibrennen lokale Überhitzungen auftreten, die mit der erfindungsgemäßen Anordnung erkannt werden können. In einem solchen Fall kann das Freibrennen beendet werden.If at least some of the thermoelectric elements are arranged to a part in the interior of the emission control system, their temperature at the hot end corresponds very closely to the temperature to be monitored. With an intact catalyst with a high conversion rate, a temperature which is otherwise the same as exhaust gas composition, temperature of the exhaust gas when entering the exhaust gas purification system and exhaust gas quantity is higher than in the case of an already zone-damaged catalyst. In the case of a particulate filter, local overheating can occur during burn-off, which can be detected with the arrangement according to the invention. In such a case, burnout can be stopped.
Ist der thermoelektrische Generator mit einer Spannungsquelle verbindbar, kann im Fall einer sich andeutenden Überhitzung der Abgasreinigungsanlage mittels des Generators eine Kühlung bewirkt werden, indem die Spannungen so gepolt werden, dass die der Abgasreinigungsanlage zugewendete Seite über den Peltier-Effekt gekühlt wird. Durch die Abgriffe an den Verbindungsstellen der thermoelektrischen Elemente kann dies auch lokal gezielt bewirkt werden.If the thermoelectric generator can be connected to a voltage source, a cooling can be effected in the case of a suggestive overheating of the exhaust gas purification system by means of the generator by polarizing the voltages such that the side facing the exhaust gas purification system is cooled by the Peltier effect. By the taps at the junctions of the thermoelectric elements, this can also be effected locally targeted.
Die erfindungsgemäße Vorrichtung ist für Abgasreinigungsanlagen geeignet, die als ein Partikelfilter, ein Dreiwege-Katalysator oder als ein Stickoxid-Speicherkatalysator ausgebildet sind.The device according to the invention is suitable for emission control systems which are designed as a particle filter, a three-way catalytic converter or as a nitrogen oxide storage catalytic converter.
Kurze Beschreibung der ZeichnungenBrief description of the drawings
Die Erfindung wird im Folgenden anhand eines in den Figuren dargestellten Ausführungsbeispiels näher erläutert. Es zeigen:The invention will be explained in more detail below with reference to an embodiment shown in FIGS. Show it:
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Claims (5)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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DE102009046331A DE102009046331A1 (en) | 2009-11-03 | 2009-11-03 | Device for determining temperature profile of e.g. particulate filter in exhaust gas duct of internal-combustion engine of motor vehicle, has tap provided between elements of thermoelectric generator to determine electrical voltage |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102009046331A DE102009046331A1 (en) | 2009-11-03 | 2009-11-03 | Device for determining temperature profile of e.g. particulate filter in exhaust gas duct of internal-combustion engine of motor vehicle, has tap provided between elements of thermoelectric generator to determine electrical voltage |
Publications (1)
Publication Number | Publication Date |
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DE102009046331A1 true DE102009046331A1 (en) | 2011-05-05 |
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DE102009046331A Withdrawn DE102009046331A1 (en) | 2009-11-03 | 2009-11-03 | Device for determining temperature profile of e.g. particulate filter in exhaust gas duct of internal-combustion engine of motor vehicle, has tap provided between elements of thermoelectric generator to determine electrical voltage |
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DE (1) | DE102009046331A1 (en) |
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2009
- 2009-11-03 DE DE102009046331A patent/DE102009046331A1/en not_active Withdrawn
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