WO1996021128A1 - Vehicle heater with combustion-air fan control - Google Patents

Vehicle heater with combustion-air fan control Download PDF

Info

Publication number
WO1996021128A1
WO1996021128A1 PCT/DE1995/001750 DE9501750W WO9621128A1 WO 1996021128 A1 WO1996021128 A1 WO 1996021128A1 DE 9501750 W DE9501750 W DE 9501750W WO 9621128 A1 WO9621128 A1 WO 9621128A1
Authority
WO
WIPO (PCT)
Prior art keywords
combustion air
combustion
air
fuel
electric motor
Prior art date
Application number
PCT/DE1995/001750
Other languages
German (de)
French (fr)
Inventor
Herbert Langen
Original Assignee
Firma J. Eberspächer
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
Application filed by Firma J. Eberspächer filed Critical Firma J. Eberspächer
Publication of WO1996021128A1 publication Critical patent/WO1996021128A1/en

Links

Classifications

    • 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
    • F01N3/22—Control of additional air supply only, e.g. using by-passes or variable air pump drives
    • F01N3/222—Control of additional air supply only, e.g. using by-passes or variable air pump drives using electric valves only
    • 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
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
    • F01N3/025—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust
    • 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
    • F01N3/22—Control of additional air supply only, e.g. using by-passes or variable air pump drives
    • 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
    • F01N9/00—Electrical control of exhaust gas treating apparatus
    • F01N9/002—Electrical control of exhaust gas treating apparatus of filter regeneration, e.g. detection of clogging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N3/00—Regulating air supply or draught
    • F23N3/08—Regulating air supply or draught by power-assisted systems
    • F23N3/082—Regulating air supply or draught by power-assisted systems using electronic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/18—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel
    • F23N5/184—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel using electronic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2233/00—Ventilators
    • F23N2233/06—Ventilators at the air intake
    • F23N2233/08—Ventilators at the air intake with variable speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2241/00—Applications
    • F23N2241/14—Vehicle heating, the heat being derived otherwise than from the propulsion plant
    • 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
    • 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

Definitions

  • the invention relates to a vehicle heating device with a burner to which fuel and combustion air is fed via a ner combustion air blower driven by an electric motor, and one
  • Vehicle heaters are used in particular as auxiliary heater-independent auxiliary heaters in cars and trucks, camping trailers, campers, but also in boats and ships.
  • a special area of application are also construction machines and devices, which require sufficient heating for the machine driver's room, especially for winter operation.
  • Essential components of the usual vehicle heaters are a combustion chamber around which a circulated heat transfer medium flows, which is preceded by a burner, to which fuel is fed via a metering pump and combustion air is fed via a combustion blower unit.
  • the operation of the vehicle heating device is controlled by a controller which is usually designed as an electronic component.
  • Combustion air blower operated at such a constant speed that - ideally - the most favorable combustion resulted in terms of exhaust gas composition, temperatures and efficiency.
  • Deviations of the amount of air delivered by the blower per unit of time from the ideal amount of air related to the amount of fuel delivered are derived from the ideal amount of air related to the amount of fuel delivered.
  • blower units including drive rotors with tolerances of ⁇ 10% specified by the manufacturer are usually sold. That means: for example, with a Characteristic curve of the air flow as a function of the fan speed, the air flow at certain speeds may be 10% above or 10% below the setpoint. In other words: The total fluctuation range of the air flow at a certain speed with a setpoint of "100" can be between
  • the invention has for its object to provide a vehicle heater of the type mentioned, in which an optimal combustion in the burner is practically always achieved with relatively simple means.
  • Output is connected to the controller, which controls the speed of the electric motor depending on the sensor output signal.
  • Air mass flow sensors are state of the art today, they are used especially in the regulation of catalysts of the exhaust gas
  • a special embodiment is designed as a hot wire anemometer.
  • the sensor delivers an analog or digital signal, which is further processed by the control.
  • the control then outputs a control signal to the electric motor of the blower in order to regulate the blower speed to such a value that the measured air mass flow corresponds to the desired mass flow corresponding to the respective quantity of fuel delivered.
  • the mass flow sensor in the combustion air inlet duct is upstream with respect to the
  • Combustion air blower arranged. This arrangement is structural very cheap. In principle, however, it is also possible to arrange the mass flow sensor directly behind the fan.
  • the present invention is not limited to the vehicle heaters explained in more detail above, but the regulation of one
  • Combustion air blower as a function of a mass flow sensor arranged in the air duct is also and in particular possible for burners for the thermal regeneration of a particle filter for diesel engine exhaust gases.
  • burners are used for "cleaning" particle filters in the exhaust gas duct of diesel engines.
  • the advantages explained above for regulating the combustion air blower according to the invention can also be used in such burners (heating devices).
  • Fig. 1 is a block diagram of an embodiment of part of a vehicle heater
  • Fig. 2 is a schematic representation of a vehicle heater.
  • a vehicle heater 20 has a metallic housing 22 in which a combustion chamber 24 is formed, which is closed on all sides except for an opening on the burner side. Water is conducted as a heat carrier through the annular space between the outer housing 22 and the combustion chamber 24, for which purpose flow guide ribs, indicated by dashed lines in FIG. 2, are formed on the outside of the combustion chamber 24.
  • a burner 26 adjoining the combustion chamber is supplied with fuel in a quantity predetermined by a controller 4 in accordance with the requested burner output via a metering pump P.
  • the burner 26 receives combustion air via a combustion air blower unit 6.
  • the combustion air reaches the actual blower via a combustion air duct 2, into which a schematically indicated mass flow sensor 8 is inserted.
  • the controller 4 receives various signals required for the control operation and outputs them to the various components of the
  • Fig. 1 schematically shows the control of the combustion air blower unit 6, which includes an electric motor 10 and an air blower 12 coupled to the output shaft of the electric motor 10.
  • 1 shows various sections 2, 2 2 and 2 3 of the combustion air duct 2.
  • the mass flow sensor 8, which is designed here as a hot-wire anemometer, is located between the sections 2 and 2.
  • the sensor 8 delivers an actual
  • Air mass flow signal M to the controller 4, which also receives a fuel flow signal M B.
  • the controller 4 determines a target air mass throughput from the fuel throughput signal M B , and in order to set this throughput in the combustion air duct, the controller 4 sets the corresponding speed n of the electric motor 10.
  • the speed n of the electric motor 10 is a function of the air mass flow M measured in the combustion air duct; the air mass flow is the air mass flowing per unit of time.

Abstract

The invention concerns a vehicle heater in which an exactly metered amount of fuel per unit time is fed to a burner by a pump. A fan (12) supplies, in dependence on the amount of fuel, the appropriate amount of air for optimum combustion. Since conventional fans have wide tolerance ranges, i.e. since the air-flow rate stated for a given fan speed is in fact subject to considerable fluctuations, an air-flow sensor (8) is fitted in the combustion-air inlet duct to ensure combustion is always optimum, the heater control unit (4) controlling, in dependence on the measured air flow, the rpm (n) of the electric motor (10) which drives the fan.

Description

1 1
Fahrzeugheizgerät mit geregeltem VerbrennungsluftgebläseVehicle heater with controlled combustion air fan
Die Erfindung betrifft ein Fahrzeugheizgerät, mit einem Brenner, dem Brennstoff und über ein von einem Elektromotor angetriebenes Nerbrennungsluftgebläse Verbrennungsluft zugeführt wird, und einerThe invention relates to a vehicle heating device with a burner to which fuel and combustion air is fed via a ner combustion air blower driven by an electric motor, and one
Steuerung.Control.
Fahrzeugheizgeräte gelangen insbesondere als antriebsmotorunabhängige Zusatzheizgeräte in Personen- und Lastkraftwagen, Campinganhängern, Campingmobilen, aber auch in Booten und Schiffen zum Einsatz. Ein spezielles Anwendungsgebiet sind auch Baumaschinen und -gerate, die insbesondere für den Winterbetrieb eine ausreichende Beheizung für den Maschinenführerraum benötigen.Vehicle heaters are used in particular as auxiliary heater-independent auxiliary heaters in cars and trucks, camping trailers, campers, but also in boats and ships. A special area of application are also construction machines and devices, which require sufficient heating for the machine driver's room, especially for winter operation.
Wesentliche Bestandteile der üblichen Fahrzeugheizgeräte sind eine von einem umgewälzten Wärmeträger umströmte Brennkammer, welcher ein Brenner vorgeschaltet ist, dem seinerseits über eine Dosierpumpe Brennstoff und über eine Verbrennungsgebläseeinheit Verbrennungsluft zugefühπ werden. Der Betrieb des Fahrzeugheizgeräts wird von einer üblicherweise als Elektronik-Bauteil ausgebildeten Steuerung gesteuert.Essential components of the usual vehicle heaters are a combustion chamber around which a circulated heat transfer medium flows, which is preceded by a burner, to which fuel is fed via a metering pump and combustion air is fed via a combustion blower unit. The operation of the vehicle heating device is controlled by a controller which is usually designed as an electronic component.
Früher war es üblich, derartige Fahrzeugheizgeräte mit stufenweise verstellbarer Leistung auszuführen. Je nach eingestellter Leistungsstufe wurde dem Brenner dann von der Dosierpumpe eine bestimmte Menge Brennstoff zugeführt, und dazu entsprechend wurde dasIn the past, it was common to design such vehicle heaters with power that can be adjusted in stages. Depending on the set power level, the burner was then supplied with a certain amount of fuel by the metering pump, and this was done accordingly
Verbrennungsluftgebläse mit einer solchen, konstanten Drehzahl betrieben, daß sich - im Idealfall - die hinsichlich Abgaszusammensetzung, Temperaturen und Wirkungsgrad günstigste Verbrennung ergab.Combustion air blower operated at such a constant speed that - ideally - the most favorable combustion resulted in terms of exhaust gas composition, temperatures and efficiency.
Solange der das Verbrennungsluftgebläse antreibende Elektromotor mit konstanten Spannungen betrieben wird, ist die Drehzahl des Motors abhängig von einer stabilen Versorgungsspannung. Bei Schwankungen der Versorgungsspannungen müssen beträchtliche Drehzahlschwankungen in Kauf genommen werden. Das Verhältnis von Verbrennungsluft und Brennstoff ändert sich dabei unter Umständen sehr stark, so daß die Verbrennung bei weitem nicht optimal ist. Zur Behebung dieser unzulänglichen Versorgung des Brenners mit Verbrennungsluft, aber auch im Hinblick auf eine stufenlose Änderung der Brennerleistung mit entsprechend stufenloser oder feinabgestufter Einstellung der Brennstoffzufuhr wurde die Drehzahlregelung für den Antriebsmotor des Verbrennungsluftgebläses eingeführt. Ausgangspunkt war die jeweils geforderte Brennerleistung, in deren Abhängigkeit die Brermstoffzufuhr über die Ansteuerung der Dosieφumpe eingestellt wurde. Abhängig von dem Brennstoff-Durchsatz wurde dann die Drehzahl des Verbrennungsluftgebläses - basierend auf den Kennwerten des Verbrennungsluftgebläses - so geregelt, daß man eine optimaleAs long as the electric motor driving the combustion air blower is operated with constant voltages, the speed of the motor is depending on a stable supply voltage. In the event of fluctuations in the supply voltages, considerable speed fluctuations must be accepted. The ratio of combustion air and fuel changes very strongly under certain circumstances, so that the combustion is far from optimal. In order to remedy this inadequate supply of the burner with combustion air, but also with regard to a continuous change in the burner output with a correspondingly stepless or fine-tuned setting of the fuel supply, the speed control for the drive motor of the combustion air blower was introduced. The starting point was the burner output required, depending on which the fuel supply was set via the control of the dosing pump. Depending on the fuel throughput, the speed of the combustion air blower was then regulated - based on the characteristic values of the combustion air blower - in such a way that an optimum was achieved
Verbrennung erwarten durfte.May expect combustion.
Ein derart aufgebauter und betriebener Brenner eines Fahrzeugheizgeräts arbeitet mit Einschränkungen zufriedenstellend. Allerdings gibt es trotz der Drehzahlregelung des Verbrennungsluftgebläses noch erheblicheA burner of a vehicle heating device constructed and operated in this way works satisfactorily with restrictions. However, despite the speed control of the combustion air blower, there are still significant ones
Abweichungen der pro Zeiteinheit von dem Gebläse geförderten Luftmenge von der auf die geförderte Brennstoffmenge bezogenen idealen Luftmenge. Während der Durchsatz von Brennstoff mit den heute zur Verfügung stehenden, üblicherweise als druckgesteuerte Pumpe ausgebildeten Dosierpumpen in sehr engen Grenzen mit hoherDeviations of the amount of air delivered by the blower per unit of time from the ideal amount of air related to the amount of fuel delivered. During the throughput of fuel with the metering pumps available today, usually designed as pressure-controlled pumps, within very narrow limits with high
Genauigkeit geregelt werden kann, unterliegt der von der Drehzahl abhängige Durchsatz von Luft bei den derzeit üblichen Verbrennungsluftgebläsen erheblichen Schwankungen. Zurückzuführen ist diese unerwünschte Eigenschaft üblicher Gebläse auf gewisse Störgrößen, zu denen insbesondere die Fertigungstoleranzen gehören.Accuracy can be controlled, the speed-dependent throughput of air is subject to considerable fluctuations in the combustion air blowers currently customary. This undesirable property of conventional fans can be attributed to certain disturbance variables, which in particular include the manufacturing tolerances.
Nicht nur das Gebläse selbst in seinem mechanischen Aufbau unterliegt erheblichen Fertigungstoleranzen, sondern auch die für den Antrieb des Gebläses verwendeten Elektromotoren weisen erhebliche Streuung auf. Üblicherweise werden Verbrennungsluftgebläseeinheiten einschließlich Antriebsrotor mit herstellerseitig angegebenen Toleranzen von ± 10 % in den Handel gebracht. Das heißt: Bei einem beispielsweise durch eine Kennlinie angegebenen Verlauf des Luftdurchsatzes in Abhängigkeit der Gebläsedrehzahl kann der Luftdurchsatz bei bestimmten Drehzahlen um 10 % über oder um 10 % unterhalb des Sollwerts liegen. Anders ausgedrückt: Die gesamte Schwankungsbreite des Luftdurchsatzes bei einer gewissen Drehzahl bei einem Sollwert von "100" kann zwischenNot only the blower itself in its mechanical construction is subject to considerable manufacturing tolerances, but also the electric motors used to drive the blower show considerable variation. Combustion air blower units including drive rotors with tolerances of ± 10% specified by the manufacturer are usually sold. That means: for example, with a Characteristic curve of the air flow as a function of the fan speed, the air flow at certain speeds may be 10% above or 10% below the setpoint. In other words: The total fluctuation range of the air flow at a certain speed with a setpoint of "100" can be between
90 und 110 liegen.90 and 110 lie.
Man sieht also, daß auch bei sehr gut arbeitender Drehzahlregelung, bei der die Ist-Drehzahl des Verbrennungsluftgebläses bzw. des das Gebläse antreibenden Elektromotors mit der Soll-Drehzahl verglichen wird, die tatsächlich geförderte Luftmenge erheblich von der idealen Luftmenge abweichen kann.It can be seen that even with very good speed control, in which the actual speed of the combustion air blower or the electric motor driving the blower is compared with the target speed, the amount of air actually delivered can deviate significantly from the ideal amount of air.
Der Erfindung liegt die Aufgabe zugrunde, ein Fahrzeugheizgerät der eingangs genannten Art anzugeben, bei dem mit vergleichsweise einfachen Mitteln praktisch immer eine optimale Verbrennung im Brenner erreicht wird.The invention has for its object to provide a vehicle heater of the type mentioned, in which an optimal combustion in the burner is practically always achieved with relatively simple means.
Gelöst wird diese Aufgabe erfindungsgemäß dadurch, daß in dem Verbrennungsluftkanal ein Massenstromsensor angeordnet ist, dessenThis object is achieved in that a mass flow sensor is arranged in the combustion air duct, the
Ausgang mit der Steuerung verbunden ist, welche in Abhängigkeit des Sensor-Ausgangssignals die Drehzahl des Elektromotors regelt.Output is connected to the controller, which controls the speed of the electric motor depending on the sensor output signal.
Luftmassenstromsensoren sind heute Stand der Technik, sie werden speziell bei der Regelung von Katalysatoren des Abgases vonAir mass flow sensors are state of the art today, they are used especially in the regulation of catalysts of the exhaust gas
Verbrennungsmotoren eingesetzt. Eine spezielle Ausführungsform ist als Hitzedraht-Anemometer ausgebildet. Der Sensor liefert ein analoges oder digitales Signal, welches von der Steuerung weiterverarbeitet wird. Die Steuerung gibt dann ein Stellsignal an den Elektromotor des Gebläses, um die Gebläsedrehzahl auf einen solchen Wert einzuregeln, daß der gemessene Luftmassenstrom dem durch die jeweilige geförderte Brennstoffmenge entsprechenden Soll-Massenstrom entspricht.Internal combustion engines used. A special embodiment is designed as a hot wire anemometer. The sensor delivers an analog or digital signal, which is further processed by the control. The control then outputs a control signal to the electric motor of the blower in order to regulate the blower speed to such a value that the measured air mass flow corresponds to the desired mass flow corresponding to the respective quantity of fuel delivered.
In einer bevorzugten Ausführungsform ist der Massenstromsensor in dem Verbrennungslufteinlaßkanal stromauf bezüglich desIn a preferred embodiment, the mass flow sensor in the combustion air inlet duct is upstream with respect to the
Verbrennungsluftgebläses angeordnet. Diese Anordnung ist baulich besonders günstig. Möglich ist grundsätzlich aber auch die Anordnung des Massenstromsensors direkt hinter dem Gebläse.Combustion air blower arranged. This arrangement is structural very cheap. In principle, however, it is also possible to arrange the mass flow sensor directly behind the fan.
Die vorliegende Erfindung ist nicht auf die oben näher erläuterten Fahrzeugheizgeräte beschränkt, sondern die Regelung einesThe present invention is not limited to the vehicle heaters explained in more detail above, but the regulation of one
Verbrennungsluftgebläses in Abhängigkeit eines im Luftkanal angeordneten Massenstromsensors ist auch und insbesondere möglich bei Brennern für die thermische Regeneration eines Partikelfilters für Dieselmotorabgase. Bekanntlich dienen solche Brenner zum "Reinigen" von Partikelfiltern im Abgaskanal von Dieselmotoren. Auch bei derartigen Brennern (Heizgeräten) können die oben erläuterten Vorteile der erfindungsgemäßen Regelung des Verbrennungsluftgebläses genutzt werden. Combustion air blower as a function of a mass flow sensor arranged in the air duct is also and in particular possible for burners for the thermal regeneration of a particle filter for diesel engine exhaust gases. As is known, such burners are used for "cleaning" particle filters in the exhaust gas duct of diesel engines. The advantages explained above for regulating the combustion air blower according to the invention can also be used in such burners (heating devices).
Im folgenden wird ein Ausführungsbeispiel der Erfindung anhand der Zeichnungen näher erläutert. Es zeigen:An exemplary embodiment of the invention is explained in more detail below with reference to the drawings. Show it:
Fig. 1 ein Blockdiagramm einer Ausfuhrungsform eines Teils eines Fahrzeugheizgeräts, undFig. 1 is a block diagram of an embodiment of part of a vehicle heater, and
Fig. 2 eine schematische Darstellung eines Fahrzeugheizgeräts.Fig. 2 is a schematic representation of a vehicle heater.
Zum besseren Verständnis der Erfindung soll anhand von Fig. 2 zunächst kurz der grundsätzliche Aufbau eines Fahrzeugheizgeräts erläutert werden.For a better understanding of the invention, the basic structure of a vehicle heater will first be briefly explained with reference to FIG. 2.
Ein Fahrzeugheizgerät 20 besitzt ein metallisches Gehäuse 22, in der eine bis auf eine brennerseitige Öffnung allseitig geschlossene Brennkammer 24 ausgebildet ist. Durch den Ringraum zwischen äußerem Gehäuse 22 und Brennkammer 24 wird Wasser als Wärmeträger geleitet, wozu in Fig. 2 gestrichelt angedeutete Strömungsleitrippen auf der Außenseite der Brennkammer 24 ausgebildet sind.A vehicle heater 20 has a metallic housing 22 in which a combustion chamber 24 is formed, which is closed on all sides except for an opening on the burner side. Water is conducted as a heat carrier through the annular space between the outer housing 22 and the combustion chamber 24, for which purpose flow guide ribs, indicated by dashed lines in FIG. 2, are formed on the outside of the combustion chamber 24.
Einem an die Brennkammer anschließenden Brenner 26 wird über eine Dosieφumpe P Brennstoff in der von einer Steuerung 4 vorgegebenen Menge entsprechend der angeforderten Brennerleistung zugeführt. Verbrennungsluft erhält der Brenner 26 über eine Verbrennungsluftgebläseeinheit 6. Die Verbrennungsluft gelangt über einen Verbrennungsluftkanal 2, in den ein schematisch angedeuteter Massenstromsensor 8 eingefügt ist, zu dem eigentlichen Gebläse.A burner 26 adjoining the combustion chamber is supplied with fuel in a quantity predetermined by a controller 4 in accordance with the requested burner output via a metering pump P. The burner 26 receives combustion air via a combustion air blower unit 6. The combustion air reaches the actual blower via a combustion air duct 2, into which a schematically indicated mass flow sensor 8 is inserted.
Die Steuerung 4 empfängt verschiedene für den Steuerungsbetrieb erforderliche Signale und gibt an die verschiedenen Komponenten desThe controller 4 receives various signals required for the control operation and outputs them to the various components of the
Fahrzeugheizgeräts Stell- oder Schaltsignale.Vehicle heater control or switching signals.
F i g . 1 z e i g t s c h e m a t i s c h d i e R e g e l u n g d e r Verbrennungsluftgebläseeinheit 6, die einen Elektromotor 10 und ein mit der Ausgangswelle des Elektromotors 10 gekoppeltes Luftgebläse 12 enthält. In Fig. 1 sind verschiedene Abschnitte 2, 22 und 23 des VeΛrennungsluftkanals 2 dargestellt. Zwischen den Abschnitten 2. und 2. befindet sich der Massenstromsensor 8, der hier als Hitzedraht- Anemometer ausgebildet ist. Der Sensor 8 liefert ein Ist-Fig. 1 schematically shows the control of the combustion air blower unit 6, which includes an electric motor 10 and an air blower 12 coupled to the output shaft of the electric motor 10. 1 shows various sections 2, 2 2 and 2 3 of the combustion air duct 2. The mass flow sensor 8, which is designed here as a hot-wire anemometer, is located between the sections 2 and 2. The sensor 8 delivers an actual
Luftmassenstromsignal M an die Steuerung 4, die außerdem ein Brennstoffdurchsatzsignal MB empfängt . Aus dem Brennstoffdurchsatzsignal MB ermittelt die Steuerung 4 einen Soll- Luftmassendurchsatz, und um diesen Durchsatz in dem Veibrennungsluftkanal einzustellen, stellt die Steuerung 4 die entsprechende Drehzahl n des Elektromotors 10 ein. Die Drehzahl n des Elektromotors 10 ist eine Funktion des in dem Verbrennungsluftkanal gemessenen Lüftmassenstroms M; der Luftmassenstrom ist die pro Zeiteinheit strömende Luftmasse.Air mass flow signal M to the controller 4, which also receives a fuel flow signal M B. The controller 4 determines a target air mass throughput from the fuel throughput signal M B , and in order to set this throughput in the combustion air duct, the controller 4 sets the corresponding speed n of the electric motor 10. The speed n of the electric motor 10 is a function of the air mass flow M measured in the combustion air duct; the air mass flow is the air mass flowing per unit of time.
Wie man sieht, kann mit Hilfe der in Flg. 1 dargestellten Regelung auch dann stets die zu dem Brennstoffdurchsatz optimal passende Verbrennungsluftmenge von dem Gebläse 12 gefördert werden, wenn dieses Gebläse 12 an sich unter dem Mangel eines sehr großen Toleranzbereichs leidet, also der in Abhängigkeit der Drehzahl n angegebene Luftstromdurchsatz sehr starken Schwankungen unterworfen ist. Selbst wenn sich die drehzahlabhängige Durchsatzkennlinie des Gebläses im Laufe der Zeit ändern sollte, beispielsweise durch Verformungen des Laufrades, Verschmutzung oder dergleichen, so wird dennoch stets die für eine optimale Verbrennung benötigte Luftmenge gefördert. As you can see, with the help of Flg. 1 shown control always the combustion air quantity optimally matched to the fuel throughput are conveyed by the blower 12 when this blower 12 itself suffers from the lack of a very large tolerance range, that is to say the air flow throughput indicated as a function of the speed n is subject to very strong fluctuations. Even if the speed-dependent throughput characteristic of the blower should change over time, for example due to deformation of the impeller, dirt or the like, the amount of air required for optimal combustion is always delivered.

Claims

Patentanspruche Claims
1. Fahizeugheizgerät mit einem Brenner (26), dem Brennstoff und über ein von einem Elektromotor (10) angetriebenes1. Fahizeugheizgerät with a burner (26), the fuel and a driven by an electric motor (10)
Verbrennungsluftgebläse (12) Verbrennungsluft zugeführt wird, und einer Steuerung (4), dadurch gekennzeichnet, daß in dem Verbrennungsluftkanal (2) ein Massenstromsensor (8) angeordnet ist, dessen Ausgang mit der Steuerung (4) verbunden ist, welche in Abhängigkeit des Sensor-Ausgangssignals (M) die Drehzahl (n) des Elektromotors (10) regelt.Combustion air blower (12) combustion air is supplied, and a controller (4), characterized in that a mass flow sensor (8) is arranged in the combustion air duct (2), the output of which is connected to the controller (4), which is dependent on the sensor Output signal (M) controls the speed (n) of the electric motor (10).
2. Fahrzeugheizgerät nach Anspruch 1, dadurch gekennzeichnet, daß der Massenstromsensor (8) in dem Verbrennungsluftein kanal stromauf bezüglich des Verbrennungsluftgebläses (12) angeordnet ist.2. Vehicle heater according to claim 1, characterized in that the mass flow sensor (8) in the combustion air channel upstream with respect to the combustion air blower (12) is arranged.
3. Brenner für thermische Regeneration eines Partikelfilters für3. Burner for thermal regeneration of a particle filter for
Dieselmotorabgas, welchem Brennstoff und über ein von einem Elektromotor angetriebenes Verbrennungsluftgebläse Verbrennungsluft zugeführt wird, mit einer Steuerung, dadurch gekennzeichnet, daß in dem Vert>reιmungsluftkanal ein Massenstromsensor angeordnet ist, dessen Ausgang mit der Steuerung verbunden ist, welche in Abhängigkeit des Sensor-Ausgangssignals die Drehzahl des Elektromotors regelt. Diesel engine exhaust gas, to which fuel and combustion air is fed by a combustion air blower driven by an electric motor, with a control, characterized in that a mass flow sensor is arranged in the distribution air duct, the output of which is connected to the control, which, depending on the sensor output signal Regulates the speed of the electric motor.
PCT/DE1995/001750 1994-12-30 1995-12-02 Vehicle heater with combustion-air fan control WO1996021128A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP4447286.2 1994-12-30
DE4447286A DE4447286A1 (en) 1994-12-30 1994-12-30 Vehicle heater with controlled combustion air fan

Publications (1)

Publication Number Publication Date
WO1996021128A1 true WO1996021128A1 (en) 1996-07-11

Family

ID=6537529

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1995/001750 WO1996021128A1 (en) 1994-12-30 1995-12-02 Vehicle heater with combustion-air fan control

Country Status (2)

Country Link
DE (1) DE4447286A1 (en)
WO (1) WO1996021128A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10114405B4 (en) * 2001-03-23 2011-03-24 Ebm-Papst Landshut Gmbh Blower for combustion air
DE102012019409A1 (en) * 2012-10-04 2014-04-10 August Brötje GmbH Device for generating heat from at least one energy carrier medium with the addition of air

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10050513A1 (en) * 2000-10-11 2002-04-25 Webasto Thermosysteme Gmbh Controlling vehicle heater involves controlling combustion air flow if sensor measurement value lies above upper threshold value or below lower threshold value for combustion air flow
DE10063922C1 (en) 2000-12-20 2002-07-18 Webasto Thermosysteme Gmbh Heater, for vehicle, includes protective device with heat carrier mass flow meter to protect immediately against overheating
DE10125588C1 (en) 2001-05-25 2002-06-06 Webasto Thermosysteme Gmbh Automobile auxiliary heating device controlled in dependence on detected quality of fuel supplied to burner
DE10144406C1 (en) * 2001-09-10 2003-05-22 Webasto Thermosysteme Gmbh Auxiliary heating device for automobile or boat has burner controlled depending on combustion characteristics and detected fuel mass
DE10144402B4 (en) * 2001-09-10 2004-05-06 Webasto Thermosysteme International Gmbh Mobile auxiliary heater with airtight control
DE10157310C1 (en) * 2001-11-23 2002-10-31 Webasto Thermosysteme Gmbh Automobile heating device with liquid-fuel burner has fuel feed monitoring device providing signal for control unit for heating device
DE10218900B4 (en) * 2002-04-26 2010-03-04 Webasto Ag Car heater
WO2004000590A1 (en) * 2002-06-20 2003-12-31 Webasto Thermosysteme Gmbh Heat-generating apparatus comprising an overheat-protecting device and method for controlling said apparatus
DE10335307B4 (en) * 2003-08-01 2005-08-04 Webasto Ag Method for controlling the combustion air mass flow in a heater
DE102008063990A1 (en) 2008-12-19 2010-06-24 J. Eberspächer GmbH & Co. KG vehicle burner
DE102010021753B4 (en) * 2009-12-17 2016-02-04 Deutz Ag Regeneration of particle filters
DE202010018511U1 (en) * 2010-03-10 2017-03-24 Ebm-Papst Landshut Gmbh Pneumatic compound with mass balance

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59226221A (en) * 1983-06-07 1984-12-19 Mitsubishi Motors Corp Burner air control system for diesel particulate filter system
US4613072A (en) * 1984-07-31 1986-09-23 Mikuni Kogyo Kabushiki Kaisha Apparatus for heating fluid by burning liquid fuel
GB2237665A (en) * 1989-10-31 1991-05-08 Potterton Int Ltd Boiler control
JPH03286920A (en) * 1990-03-30 1991-12-17 Noritz Corp Air quantity controller
EP0520170A1 (en) * 1991-06-22 1992-12-30 Zeuna-Stärker Gmbh & Co Kg Method for controlling the air supply to a burner for the regeneration of particle filters
JPH05118532A (en) * 1991-10-30 1993-05-14 Yamatake Honeywell Co Ltd Combustion controller
DE4239079A1 (en) * 1992-11-20 1994-05-26 Pierburg Gmbh Burner system for exhaust gas detoxification or purification of an internal combustion engine

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59226221A (en) * 1983-06-07 1984-12-19 Mitsubishi Motors Corp Burner air control system for diesel particulate filter system
US4613072A (en) * 1984-07-31 1986-09-23 Mikuni Kogyo Kabushiki Kaisha Apparatus for heating fluid by burning liquid fuel
GB2237665A (en) * 1989-10-31 1991-05-08 Potterton Int Ltd Boiler control
JPH03286920A (en) * 1990-03-30 1991-12-17 Noritz Corp Air quantity controller
EP0520170A1 (en) * 1991-06-22 1992-12-30 Zeuna-Stärker Gmbh & Co Kg Method for controlling the air supply to a burner for the regeneration of particle filters
JPH05118532A (en) * 1991-10-30 1993-05-14 Yamatake Honeywell Co Ltd Combustion controller
DE4239079A1 (en) * 1992-11-20 1994-05-26 Pierburg Gmbh Burner system for exhaust gas detoxification or purification of an internal combustion engine

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 009, no. 103 (M - 377) 8 May 1985 (1985-05-08) *
PATENT ABSTRACTS OF JAPAN vol. 016, no. 119 (M - 1225) 25 March 1992 (1992-03-25) *
PATENT ABSTRACTS OF JAPAN vol. 017, no. 490 (M - 1474) 6 September 1993 (1993-09-06) *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10114405B4 (en) * 2001-03-23 2011-03-24 Ebm-Papst Landshut Gmbh Blower for combustion air
DE102012019409A1 (en) * 2012-10-04 2014-04-10 August Brötje GmbH Device for generating heat from at least one energy carrier medium with the addition of air
EP2716973A3 (en) * 2012-10-04 2014-09-03 August Brötje GmbH Device for generating heat from at least one energy carrier medium, with the addition of air

Also Published As

Publication number Publication date
DE4447286A1 (en) 1996-07-04

Similar Documents

Publication Publication Date Title
WO1996021128A1 (en) Vehicle heater with combustion-air fan control
EP0619197B1 (en) Engine independent vehicle heating system
EP3269572A1 (en) Heating device and method for operating same
DE10239517A1 (en) Coating device with a rotary atomizer and method for controlling its operation
EP1286458A1 (en) Method and device to control a rotary power unit
DE19906285C2 (en) Fuel-operated heater for motor vehicles
EP2502003B1 (en) Heating device
DE4120702A1 (en) BURNER FOR REGENERATING PARTICLE FILTERS
DE19526003C2 (en) Heater for a vehicle powered by an internal combustion engine
EP1992507B1 (en) Method for operating a fuel driven heating device, in particular a vehicle heating device
DE4217150C1 (en) Air-fuel heater for a car - has fuel and pressure-controlled air supply to burner, with combustion gases exhausting through heat exchanger
EP1834817B1 (en) Method for operating a vehicle heater during combustion operation
EP1333227B1 (en) Method to adapt a heating device including a burner to its dedicated air-/exhaust system
DE102006047990B4 (en) Control of heating power of a heater
DE4416014A1 (en) Improving cleaning of exhaust gases from internal combustion engines
DE4342103A1 (en) Regulation of speed of coal crushing mill having fluid torque converter
DE4342191C1 (en) Vehicle heating system
DE10346827B4 (en) Method for regulating the air temperature of a motor vehicle air conditioning system with auxiliary heating function
WO2008135010A9 (en) Heating device and method for supplying fuel to a heating device
DE102004049905A1 (en) Combustion and heating control operation for motor vehicle, involves using control unit to regulate combustion air-fuel mixture in combustion chamber of heating unit based on given ambient parameters to control motor vehicle operation
DE10343775B4 (en) Power demand controlled cooling and heating system for motor vehicles with independent of the internal combustion engine drivable conveyor
EP0764817A1 (en) Speed control
DE19951751A1 (en) Vehicle fuel delivery system has controller that sets fuel delivery quantity actually required to operate engine depending on measured air flow and additional quantity by controlling fuel pump
DE10014564A1 (en) Fuel proportioning system for IC engines has hot-start recognition unit and Lambda regulation for ventilation valve regulation
DE10247322A1 (en) Device and method for mass flow measurement

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): CA CN CZ RU US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FR GB GR IE IT LU MC NL PT SE

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
122 Ep: pct application non-entry in european phase
NENP Non-entry into the national phase

Ref country code: CA