DE102011007184A1 - Heating device for metering system of e.g. aqueous urea solution, has heating elements that provide predetermined heating power over predetermined voltage range of supply voltage to maintain specific temperature range of urea solution - Google Patents

Heating device for metering system of e.g. aqueous urea solution, has heating elements that provide predetermined heating power over predetermined voltage range of supply voltage to maintain specific temperature range of urea solution Download PDF

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DE102011007184A1
DE102011007184A1 DE102011007184A DE102011007184A DE102011007184A1 DE 102011007184 A1 DE102011007184 A1 DE 102011007184A1 DE 102011007184 A DE102011007184 A DE 102011007184A DE 102011007184 A DE102011007184 A DE 102011007184A DE 102011007184 A1 DE102011007184 A1 DE 102011007184A1
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Germany
Prior art keywords
heating
urea solution
heating device
temperature range
heating elements
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DE102011007184A
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German (de)
Inventor
Elvis Spahic
Mirza Hamzic
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Robert Bosch GmbH
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Robert Bosch GmbH
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Priority to DE102011007184A priority Critical patent/DE102011007184A1/en
Priority to IN506DE2012 priority patent/IN2012DE00506A/en
Priority to CN201210104030.8A priority patent/CN102733900B/en
Priority to FR1253285A priority patent/FR2974145B1/en
Publication of DE102011007184A1 publication Critical patent/DE102011007184A1/en
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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
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/78—Heating arrangements specially adapted for immersion heating
    • H05B3/82—Fixedly-mounted immersion heaters
    • 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
    • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
    • F01N2240/16—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being an electric heater, i.e. a resistance heater
    • 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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • 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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/10—Adding substances to exhaust gases the substance being heated, e.g. by heating tank or supply line of the added substance
    • 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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/10—Adding substances to exhaust gases the substance being heated, e.g. by heating tank or supply line of the added substance
    • F01N2610/105—Control thereof
    • 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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1486—Means to prevent the substance from freezing
    • 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
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/04—Methods of control or diagnosing
    • F01N2900/0412—Methods of control or diagnosing using pre-calibrated maps, tables or charts
    • 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
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/18—Parameters used for exhaust control or diagnosing said parameters being related to the system for adding a substance into the exhaust
    • F01N2900/1806—Properties of reducing agent or dosing system
    • F01N2900/1811—Temperature
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/002—Heaters using a particular layout for the resistive material or resistive elements
    • H05B2203/003—Heaters using a particular layout for the resistive material or resistive elements using serpentine layout
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/021—Heaters specially adapted for heating liquids
    • 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

Abstract

The heating device has heating elements (210,220) that are arranged in parallel and switched to provide a predetermined heating power over a predetermined voltage range of supply voltage to maintain a specific temperature range of aqueous urea solution. The heating element is formed meander-like or in grid shape. The temperature range of the aqueous urea solution is -40-+20[deg] C. The heating elements provide a maximum temperature of 120[deg] C.

Description

Die Erfindung betrifft eine Heizung für ein Dosiersystem für ein flüssiges Medium nach der Gattung des unabhängigen Anspruchs 1.The invention relates to a heater for a dosing system for a liquid medium according to the preamble of independent claim 1.

Stand der TechnikState of the art

Um die Emissionsgrenzwerte für Stickoxide bei Kraftfahrzeugen einhalten zu können, werden seit einiger Zeit Abgasnachbehandlungseinrichtungen eingesetzt, die eine selektive katalytische Reduktion (Selective Catalytic Reduction – SCR) der in den Rohemissionen der Brennkraftmaschine enthaltenen Stickoxide vornehmen. Dieses sogenannte SCR-Verfahren zur Abgasreinigung ist aus dem Stand der Technik bekannt, sodass auf eine detaillierte Erläuterung der bei diesen Verfahren ablaufenden chemischen Vorgänge verzichtet werden kann.In order to be able to comply with the emission limit values for nitrogen oxides in motor vehicles, exhaust aftertreatment devices have been used for some time, which carry out a selective catalytic reduction (SCR) of the nitrogen oxides contained in the raw emissions of the internal combustion engine. This so-called SCR process for exhaust gas purification is known from the prior art, so that a detailed explanation of the chemical processes occurring in these processes can be dispensed with.

Ein Beispiel einer solchen Abgasnachbehandlungseinrichtung ist aus der DE 10 2006 012 855 A1 bekannt. Dort wird eine wässrige Harnstofflösung in einem Tank gespeichert und von einer Dosierpumpe mit Hilfe eines Dosierventils bedarfsabhängig in ein Abgasrohr der Brennkraftmaschine eingedüst.An example of such an exhaust aftertreatment device is from the DE 10 2006 012 855 A1 known. There, an aqueous urea solution is stored in a tank and injected by a metering pump with the aid of a metering valve as needed in an exhaust pipe of the internal combustion engine.

Die heute gebräuchlichen flüssigen Reduktionsmittel gefrieren je nach zugesetztem Schutzmittel bei Temperaturen zwischen –11°C und –40°C. Da auch bei tiefen Temperaturen die Schadstoffe verringert werden müssen, muss das Reduktionsmittel zunächst aufgetaut werden. Bei Personenkraftwagen wird zu diesem Zweck eine elektrische Heizung im Tank des Dosiersystems eingesetzt. Eine solche Heizung, mit der das Auftauen des gefrorenen Reduktionsmittels rasch erreicht wird, ist allein schon deshalb unverzichtbar, weil das SCR-System aufgrund der gesetzlichen Vorgaben auch bei tiefen Temperaturen innerhalb einer vorgegebenen Zeit betriebsbereit sein muss.The currently used liquid reducing agents freeze at temperatures between -11 ° C and -40 ° C depending on the added protective agent. Since even at low temperatures, the pollutants must be reduced, the reducing agent must first be thawed. For passenger cars, an electric heater is used in the tank of the dosing system for this purpose. Such a heater, with which the thawing of the frozen reducing agent is rapidly achieved, is indispensable simply because the SCR system must be ready for operation within a predetermined time due to the legal requirements even at low temperatures.

Diese elektrischen Heizungen können unter bestimmten Bedingungen zu einer Überhitzung des flüssigen Mediums oder sogar zu einer Überhitzung des gesamten Fördermoduls führen, beispielsweise aufgrund eines Kurzschlusses, einer falschen Bedatung oder dergleichen. Die Folgeschäden können zum Systemausfall und dieser wiederum zu erhöhten Abgasemissionen führen.Under certain conditions, these electric heaters can lead to overheating of the liquid medium or even to overheating of the entire delivery module, for example because of a short circuit, incorrect charging or the like. The consequential damage can lead to system failure and this in turn leads to increased exhaust emissions.

Es ist daher Aufgabe der Erfindung, eine Heizung für ein Dosiersystem zu vermitteln, durch welche die vorgenannten Störfälle vermieden werden.It is therefore an object of the invention to provide a heater for a dosing system, by which the aforementioned incidents are avoided.

Offenbarung der ErfindungDisclosure of the invention

Vorteile der ErfindungAdvantages of the invention

Diese Aufgabe wird durch eine Heizung für ein Dosiersystem mit den Merkmalen des Anspruchs 1 gelöst. Grundidee der Erfindung ist es, wenigstens ein Heizelement vorzusehen, das über einen vorgebbaren Spannungsbereich der Versorgungsspannung des Fahrzeugs und über einen vorgebbaren Temperaturbereich des flüssigen Mediums eine vorgebbare Heizleistung zur Verfügung stellt. Auf diese Weise können Überhitzungen vermieden werden, andererseits ist auch bei sehr tiefen Temperaturen ein schnelles Auftauen und eine Heizungsfunktion, welche das Dosiermittel auch bei tiefen Temperaturen auf der gewünschten Temperatur hält, realisierbar.This object is achieved by a heater for a dosing with the features of claim 1. The basic idea of the invention is to provide at least one heating element which provides a predefinable heating power over a predefinable voltage range of the supply voltage of the vehicle and over a predeterminable temperature range of the liquid medium. In this way, overheating can be avoided, on the other hand, even at very low temperatures, a rapid thawing and a heating function, which keeps the dosing at low temperatures at the desired temperature, feasible.

Durch die in den abhängigen Ansprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen der im unabhängigen Anspruch angegebenen Heizeinrichtung möglich. So sieht eine vorteilhafte Ausführungsform beispielsweise vor, dass das wenigstens eine Heizelement ein gitter- oder mäanderförmig aufgebautes Heizelement, ein sogenannter Base-Grid-Heater ist.The measures listed in the dependent claims advantageous refinements and improvements of the independent claim heating device are possible. For example, an advantageous embodiment provides that the at least one heating element is a lattice-shaped or meander-shaped heating element, a so-called base-grid heater.

Eine besonders vorteilhafte Ausführungsform sieht zwei parallel geschaltete Heizelemente, insbesondere zwei gitter- oder mäanderförmig aufgebaute Heizelemente, zwei sogenannter Grid Heater, vor. Hierdurch wird vermieden, dass es zu einer Überhitzung des Fördermoduls kommt oder dass der Heizbetrieb bei unzulässig hohen Temperaturen unterbrochen wird. Durch die beiden Heizelemente wird insbesondere auch eine sehr kurze Auftauzeit realisiert.A particularly advantageous embodiment provides two parallel heating elements, in particular two grid or meander-shaped heating elements, two so-called grid heaters. This avoids that the delivery module overheats or that the heating operation is interrupted at inadmissibly high temperatures. In particular, a very short thawing time is realized by the two heating elements.

Der vorgegebene Temperaturbereich wird dabei vorzugsweise so gewählt, dass er sich von –40°C bis +20°C der Harnstoff-Wasserlösung erstreckt. Das Heizelement wird dabei so gewählt, dass es eine Heizertemperatur bis maximal 120°C zur Verfügung stellt.The predetermined temperature range is preferably chosen so that it extends from -40 ° C to + 20 ° C of the urea-water solution. The heating element is chosen so that it provides a heater temperature up to 120 ° C available.

Der Spannungsbereich wird so gewählt, dass er sich im Falle einer 12 V Spannungsversorgung von 8 V bis 16 V und im Falle einer 24 V Spannungsversorgung von 16 V bis 32 V erstreckt. Hierdurch werden die in Fahrzeugen aufgrund teilentladener Batterien auftretenden Spannungsbereiche überdeckt.The voltage range is chosen to be 8 V to 16 V in the case of a 12 V power supply and 16 V to 32 V in the case of a 24 V power supply. As a result, the voltage ranges occurring in vehicles due to partially discharged batteries are covered.

Kurze Beschreibung der ZeichnungenBrief description of the drawings

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird in der nachfolgenden Beschreibung näher erläutert.An embodiment of the invention is illustrated in the drawing and will be explained in more detail in the following description.

In der Zeichnung zeigen:In the drawing show:

1 schematisch eine aus dem Stand der Technik bekannte Dosiereinrichtung eines SCR-Katalysatorsystems und 1 schematically a known from the prior art metering of an SCR catalyst system and

2 die Heizelemente einer erfindungsgemäßen Heizeinrichtung. 2 the heating elements of a heating device according to the invention.

Beschreibung von AusführungsbeispielenDescription of exemplary embodiments

In der 1 sind in schematischer Weise die bekannten Komponenten eines SCR-Katalysatorsystems dargestellt. In einem Abgasstrang 10 einer Brennkraftmaschine 11, die lediglich schematisch dargestellt ist, ist ein SCR-Katalysator 12 angeordnet, der durch eine selektive katalytische Reduktion (SCR) selektiv Stickoxide im Abgas reduziert. Bei dieser Reaktion wird Ammoniak (NH3) als Reduktionsmittel eingesetzt. Da Ammoniak eine toxische Substanz ist, wird diese Substanz aus der ungiftigen Trägersubstanz Harnstoff gewonnen. Harnstoff wird als flüssige Harnstoff-Wasserlösung über die Dosiereinrichtung 13, zum Beispiel ein Dosierventil, in den Abgasstrang 10 stromaufwärts des SCR-Katalysators 12 bedarfsabhängig eingespritzt. Die wässrige Harnstofflösung wird in einem Reduktionsmitteltank 14 bevorratet. Zur Entnahme der Harnstofflösung ist eine Saugleitung 15 vorgesehen. Die Entnahme der Lösung erfolgt mittels einer Förderpumpe 16, sodass die flüssige Lösung und der Druck in der Druckleitung 17 zur Dosiereinrichtung 13 geleitet und in den Abgasstrang 10 eingespritzt wird.In the 1 are shown in a schematic way the known components of an SCR catalyst system. In an exhaust system 10 an internal combustion engine 11 , which is shown only schematically, is an SCR catalyst 12 arranged, which selectively reduces nitrogen oxides in the exhaust gas by a selective catalytic reduction (SCR). In this reaction, ammonia (NH 3 ) is used as a reducing agent. Since ammonia is a toxic substance, this substance is derived from the non-toxic carrier substance urea. Urea is used as a liquid urea-water solution through the metering device 13 , for example, a metering valve, in the exhaust system 10 upstream of the SCR catalyst 12 injected according to demand. The aqueous urea solution is placed in a reducing agent tank 14 stored. To remove the urea solution is a suction line 15 intended. The removal of the solution by means of a feed pump 16 so that the liquid solution and the pressure in the pressure line 17 to the metering device 13 passed and into the exhaust system 10 is injected.

Der Reduktionsmitteltank 14 ist mit einer Heizeinrichtung 18 ausgestaltet, die wenigstens ein Heizelement, insbesondere zwei Heizelemente, die nachfolgend noch näher erläutert werden, umfasst. Die Heizeinrichtung 18 wird durch ein Steuergerät 19 mittels eines Leistungsschalters 20 angesteuert. Der Leistungsschalter 20 ist mit dem Steuergerät 19 durch eine Steuerleitung 21 verbunden. Die Heizeinrichtung 18 ist mit dem Steuergerät 19 über eine Signalleitung 22 verbunden, über die messbare Größen, die den Stromverlauf an den Heizelementen der Heizeinrichtung 18 charakterisieren, an das Steuergerät 19 weitergeleitet werden. Die Temperatur im Reduktionsmitteltank kann auf an sich bekannte Weise mittels der Heizelemente erfasst werden. Diese Großen, insbesondere die an den Heizelementen messbaren Ströme und/oder Spannungen und/oder Widerstände werden über eine Leitung 22 dem Steuergerät 19 zugeführt. In 2 sind schematisch die beiden parallelgeschalteten Heizelemente der Heizeinrichtung 18 dargestellt. Jedes dieser Heizelemente 210, 220 ist jeweils ein mäanderförmiges oder gitterförmiges Heizelement, ein sogenannter Grid Heater, die über separate Anschlussklemmen 211, 212, 221, 222 verfügen. Die Heizelemente sind so ausgelegt, dass eine vorgebbare Heizleistung über einen vorgebbaren Spannungsbereich, der sich im Falle einer 12 V Spannungsversorgung von 8 V bis 16 V und sich im Falle einer 24 V Spannungsversorgung von 16 V bis 32 V erstreckt, und über einen vorgebbaren Temperaturbereich der Harnstoffwasserlösung, der sich bevorzugt zwischen –40°C und +20°C erstreckt, zur Verfügung gestellt wird. Hierzu werden Widerstände der Heizelemente entsprechend gewählt und ausgelegt, um den kompletten Spannungs- und Temperaturbereich der Auftau- und Heizfunktion zu gewährleisten. Auch im Falle eines elektrischen Kurzschlusses würde es so nicht zu einer Überhitzung des Fördermoduls kommen. Die Heiztemperatur wird dabei so gewählt, dass sie sich bis zu maximal 120°C erstreckt.The reducing agent tank 14 is with a heater 18 configured, the at least one heating element, in particular two heating elements, which are explained in more detail below, comprises. The heater 18 is through a control unit 19 by means of a circuit breaker 20 driven. The circuit breaker 20 is with the controller 19 through a control line 21 connected. The heater 18 is with the controller 19 via a signal line 22 connected, over the measurable sizes, which the current flow at the heating elements of the heating device 18 characterize, to the controller 19 to get redirected. The temperature in the reducing agent tank can be detected in a known manner by means of the heating elements. These variables, in particular the currents and / or voltages and / or resistances measurable on the heating elements, are transmitted via a line 22 the control unit 19 fed. In 2 are schematically the two parallel heating elements of the heater 18 shown. Each of these heating elements 210 . 220 is in each case a meandering or grid-shaped heating element, a so-called grid heater, which has separate connection terminals 211 . 212 . 221 . 222 feature. The heating elements are designed so that a specified heating power over a predefined voltage range, which extends in the case of a 12 V power supply from 8 V to 16 V and in the case of a 24 V power supply from 16 V to 32 V, and over a predeterminable temperature range the urea water solution, which preferably extends between -40 ° C and + 20 ° C, is provided. For this purpose, resistors of the heating elements are selected and designed accordingly to ensure the complete voltage and temperature range of the thawing and heating function. Even in the case of an electrical short circuit, the delivery module would not overheat. The heating temperature is chosen so that it extends up to a maximum of 120 ° C.

ZITATE ENTHALTEN IN DER BESCHREIBUNG QUOTES INCLUDE IN THE DESCRIPTION

Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Zitierte PatentliteraturCited patent literature

  • DE 102006012855 A1 [0003] DE 102006012855 A1 [0003]

Claims (6)

Heizeinrichtung für ein Dosiersystem für ein flüssiges Medium, insbesondere eine Harnstoff-Wasserlösung, dadurch gekennzeichnet, dass sie wenigstens ein Heizelement (210, 220) umfasst, das über einen vorgebbaren Spannungsbereich der Versorgungsspannung und einen vorgebbaren Temperaturbereich des flüssigen Mediums eine vorgebbare Heizleistung zur Verfügung stellt.Heating device for a dosing system for a liquid medium, in particular a urea-water solution, characterized in that it comprises at least one heating element ( 210 . 220 ), which provides a predefinable heating power over a predefinable voltage range of the supply voltage and a predeterminable temperature range of the liquid medium. Heizeinrichtung nach Anspruch 1, dadurch gekennzeichnet, dass das wenigstens eine Heizelement ein gitter- oder mäanderförmiges Heizelement (210, 220) ist.Heating device according to claim 1, characterized in that the at least one heating element, a grid or meandering heating element ( 210 . 220 ). Heizeinrichtung nach Anspruch 1, dadurch gekennzeichnet, dass zwei parallel geschaltete Heizelemente (210, 220) vorgesehen sind.Heating device according to claim 1, characterized in that two parallel heating elements ( 210 . 220 ) are provided. Heizeinrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass sie so gewählt wird, dass sie in einem Temperaturbereich der Harnstoffwasserlösung von –40°C bis +20°C einsetzbar ist.Heating device according to one of claims 1 to 3, characterized in that it is chosen so that it can be used in a temperature range of urea water solution of -40 ° C to + 20 ° C. Heizeinrichtung nach Anspruch 4, dadurch gekennzeichnet, dass die Heizeinrichtung eine Heizertemperatur bereitstellt, die bis maximal 120°C beträgt.Heating device according to claim 4, characterized in that the heating device provides a heater temperature which amounts to a maximum of 120 ° C. Heizeinrichtung nach Anspruch 1, dadurch gekennzeichnet, dass der Spannungsbereich sich von 8 V bis 16 V im Falle einer 12 V Spannungsversorgung und von 16 V bis 32 V im Falle einer 24 V Spannungsversorgung erstreckt.Heating device according to claim 1, characterized in that the voltage range extends from 8 V to 16 V in the case of a 12 V power supply and 16 V to 32 V in the case of a 24 V power supply.
DE102011007184A 2011-04-12 2011-04-12 Heating device for metering system of e.g. aqueous urea solution, has heating elements that provide predetermined heating power over predetermined voltage range of supply voltage to maintain specific temperature range of urea solution Withdrawn DE102011007184A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE102011007184A DE102011007184A1 (en) 2011-04-12 2011-04-12 Heating device for metering system of e.g. aqueous urea solution, has heating elements that provide predetermined heating power over predetermined voltage range of supply voltage to maintain specific temperature range of urea solution
IN506DE2012 IN2012DE00506A (en) 2011-04-12 2012-02-22
CN201210104030.8A CN102733900B (en) 2011-04-12 2012-04-11 Heater for metering system
FR1253285A FR2974145B1 (en) 2011-04-12 2012-04-11 HEATING INSTALLATION OF A DOSING SYSTEM, IN PARTICULAR A LIQUID MEDIUM AND IN PARTICULAR AN AQUEOUS SOLUTION OF UREA

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CN102733900B (en) 2017-08-08

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