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EP0708903A1 - Heater for use in vehicles - Google Patents

Heater for use in vehicles

Info

Publication number
EP0708903A1
EP0708903A1 EP94921648A EP94921648A EP0708903A1 EP 0708903 A1 EP0708903 A1 EP 0708903A1 EP 94921648 A EP94921648 A EP 94921648A EP 94921648 A EP94921648 A EP 94921648A EP 0708903 A1 EP0708903 A1 EP 0708903A1
Authority
EP
European Patent Office
Prior art keywords
combustion air
transition
speed
air blower
heater
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP94921648A
Other languages
German (de)
French (fr)
Inventor
Herbert Langen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eberspaecher Climate Control Systems GmbH and Co KG
Original Assignee
J Eberspaecher GmbH and Co KG
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 J Eberspaecher GmbH and Co KG filed Critical J Eberspaecher GmbH and Co KG
Publication of EP0708903A1 publication Critical patent/EP0708903A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/22—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant
    • B60H1/2203—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant the heat being derived from burners
    • B60H1/2206—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant the heat being derived from burners controlling the operation of burners
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/02—Regulating fuel supply conjointly with air supply
    • F23N1/022—Regulating fuel supply conjointly with air supply using electronic means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/22—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant
    • B60H2001/2228—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant controlling the operation of heaters
    • B60H2001/224—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant controlling the operation of heaters automatic operation, e.g. control circuits or methods
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/22—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant
    • B60H2001/2246—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant obtaining information from a variable, e.g. by means of a sensor
    • B60H2001/2256—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant obtaining information from a variable, e.g. by means of a sensor related to the operation of the heater itself, e.g. flame detection or overheating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/22—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant
    • B60H2001/2259—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant output of a control signal
    • B60H2001/2265—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant output of a control signal related to the quantity of heat produced by the heater
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2223/00—Signal processing; Details thereof
    • F23N2223/08—Microprocessor; Microcomputer
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2225/00—Measuring
    • F23N2225/08—Measuring temperature
    • F23N2225/18—Measuring temperature feedwater temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2227/00—Ignition or checking
    • F23N2227/10—Sequential burner running
    • 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
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/30—Pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2237/00—Controlling
    • F23N2237/10—High or low fire
    • 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

Definitions

  • the invention relates to a heating device for vehicles, with a burner, which has a fuel supply device and a combustion air blower, and a heating power control device, it being possible to switch between different power levels, in which the combustion air blower runs in each case mix at a predetermined speed.
  • the heating power is regulated in accordance with one or different parameters, for example the temperature of the heating medium (air or water).
  • a more comfortable version of such heating devices provides several, for example two, power levels. In normal operation, there is then a constant change between, for example, full load and partial load, depending on the state of the parameter parameters which are decisive for the regeneration process.
  • ERSATZBL ⁇ I7 (RULE 26) When switching from one to the other power level, there is in particular a change in the speed of the combustion air blower, and accordingly also a change in the fuel supply via the fuel pump.
  • the speed changeover of the combustion blower now brings not only considerable switching noise with devices controlled by means of relays, but also when using semiconductor switching elements and the like.
  • the rapid change in speed of the combustion air blower is usually accompanied by clearly audible and possibly unpleasant noises, which are caused, for example, by vibrations in the housing or the like.
  • the present invention is intended to remedy this.
  • the object of the invention is to develop a heating device of the type mentioned at the outset in such a way that the transition between different power levels is practically silent.
  • This object is achieved in that a smooth transition is provided in the case of a transition from one power level to another.
  • “Sliding transition” here means in particular the departure from the sudden change in the speed of the combustion air fan. If the speed of the combustion air blower decreases, for example, from a high Wen at full load to a half of Wen at partial load, the "smooth transition" takes place within a time interval of, for example, one minute. A correspondingly long transition area is also provided when the speed increases.
  • SPARE BLADE (RULE 26)
  • the transition from one speed to the other of the combustion air blower is extended so long that the desired power level (speed of the combustion air blower) is not reached at all, but before that there is yet another switchover so that after a downshift, for example gradual decrease in the speed of the combustion air fan, a subsequent gradual increase in the speed of the fan takes place, and vice versa.
  • Fig. 1 is a block diagram of a heater for vehicles
  • Fig. 2 different speed curves in a combustion air fan of a heating device.
  • FIG. 1 The construction of a heating device for vehicles shown in FIG. 1 is known per se.
  • a burner 2 In order to generate a flame in a combustion chamber 4, a burner 2 contains a fuel feed line 6 with a fuel pump 8 for supplying fuel to an evaporator, atomizer or other comparable device (not shown here).
  • a combustion air blower 10 serves to supply combustion air in accordance with the direction of the arrow shown.
  • the fuel / air mixture is ignited by an ignition device 12 at the beginning of an operating cycle, so that a flame is produced in a flame tube 14 of the combustion chamber 4.
  • the exhaust gases escape through an exhaust duct 16.
  • the flame tube 14 is surrounded by a water jacket 18, in which the water serving as heat carrier is circulated by a pump 20.
  • the temperature of the water is detected by a temperature sensor 24 in the area of a water outlet 22.
  • the temperature sensor sends corresponding signals to a heating power control circuit 26.
  • the arrangement of the flame tube 14 and the water jacket 18 forms a heat exchanger 18 which ensures the heat transfer from the combustion gases to the water in the water jacket 18.
  • the water flowing in the direction of the arrow is cooled by a water / air heat exchanger 28 shown on the right in FIG. 1. That one- when warm air coming from the heat exchanger 28 reaches a passenger compartment shown here in dash-dotted lines.
  • FIG. 2 shows at "A" the time course of the fan speed of the combustion air fan 10 shown at the bottom left in FIG. 1.
  • VL full load
  • TL part load
  • Fig. 2 "B” the transition of the fan speed from full load (VL) to partial load (TL) takes place gradually, e.g. within a period of more than about a minute. Conversely, the transition between partial load (TL) and full load (VL) also takes place gradually, e.g. within a period of about a minute.
  • the heating power control circuit shown in FIG. 1 contains corresponding circuit elements with which the gradual transitions shown in FIGS. 2B and 2C are implemented.
  • a microprocessor is provided in the heating power circuit 26, which adjusts the desired course of the speed of the combustion air blower.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Air-Conditioning For Vehicles (AREA)
  • Regulation And Control Of Combustion (AREA)

Abstract

Described is a vehicle heater with several heat-output settings. When heaters of this kind are switched from one setting to another, annoying noises are produced by the actual switching operation and by the rapid change in rpm of the combustion-air fan (10) of the burner (2) in the heater. In order to avoid this, the invention calls for a smooth, gradual change in fan rpm whenever the heater is switched from one output setting to another.

Description

HEIZEINRICHTUNG FÜR FAHRZEUGE HEATING DEVICE FOR VEHICLES
Die Erfindung betrifft eine Heizeinrichtung für Fahrzeuge, mit einem Brenner, der eine BrennstoSzuführeinrichtung und ein Verbrennungsluftgebläse aufweist, und eine Heizleistungs-Regelvorrichtung, wobei eine Umschaltung zwischen verschiedenen Lei¬ stungsstufen möglich ist, bei denen das Verbrennungsluftgebläse jeweils mix einer vorbe¬ stimmten Drehzahl läuft.The invention relates to a heating device for vehicles, with a burner, which has a fuel supply device and a combustion air blower, and a heating power control device, it being possible to switch between different power levels, in which the combustion air blower runs in each case mix at a predetermined speed.
Derartige Heizeiπrichtungen sind in verschiedensten Varianten bekannt. Die Regelung der Heizleistung erfolgt nach Maßgabe eines oder verschiedener Parameter, zum Bei¬ spiel der Temperatur des Heizmediums (Luft oder Wasser).Such heating devices are known in a wide variety of variants. The heating power is regulated in accordance with one or different parameters, for example the temperature of the heating medium (air or water).
Früher war es üblich, lediglich eine einzige Leistungsstufe bei derartigen Geräten vorzu¬ sehen, wobei dann, abhängig von einer vorgegebenen Temperatur, der Brenner einge¬ schaltet oder ausgeschaltet wurde. Dies kann unter anderem starke Temperturschwan- kungen in dem zu beheizenden Bereich zur Folge haben.In the past, it was customary to provide only a single power level in such devices, the burner then being switched on or off depending on a predetermined temperature. Among other things, this can result in strong temperature fluctuations in the area to be heated.
Eine komfortablere Version derartiger Heizeinrichtungen sieht mehrere, beispielsweise zwei, Leistungsstufen vor. Im normalen Betrieb erfolgt dann ein stetiger Wechsel zwi¬ schen beispielsweise Vollast und Teillast, je nach Zustand der für den Regeivorgang maßgeblichen Parametergrößen.A more comfortable version of such heating devices provides several, for example two, power levels. In normal operation, there is then a constant change between, for example, full load and partial load, depending on the state of the parameter parameters which are decisive for the regeneration process.
ERSATZBLÄI7 (REGEL 26) Bei einem Umschalten von der einen auf die andere Leistungsstufe erfolgt insbesondere eine Änderung der Drehzahl des Verbrennungsluflgebläses, und dementsprechend auch eine Änderung der Brennstofeufuhr über die Brennstofipumpe.ERSATZBLÄI7 (RULE 26) When switching from one to the other power level, there is in particular a change in the speed of the combustion air blower, and accordingly also a change in the fuel supply via the fuel pump.
Insbesondere die Drehzahlumschaltung des Verbrennungsgebläses bringt aber nun nicht nur bei mittels Relais gesteuerten Einrichtungen ein beträchtliches Umschaltgeräusch mit sich, sondern auch bei Verwendung von Halbleiter-Schaltelementen und dergleichen. Die rasche Drehzahländerung des Verbrennungsluflgebläses geht in der Regel mit deut¬ lich hörbaren und unter Umständen unangenehm empfundenen Geräuschen einher, die zum Beispiel durch Vibrationen des Gehäuses oder dergleichen hervorgerufen werden.In particular, the speed changeover of the combustion blower now brings not only considerable switching noise with devices controlled by means of relays, but also when using semiconductor switching elements and the like. The rapid change in speed of the combustion air blower is usually accompanied by clearly audible and possibly unpleasant noises, which are caused, for example, by vibrations in the housing or the like.
Die vorliegende Erfindung soll hier Abhilfe schaffen. Aufgabe der Erfindung ist es, eine Heizeinrichtung der eingangs genannten Art derart weiterzubilden, daß der Übergang zwischen verschiedenen Leistungsstufen praktisch geräuschlos vonstatten geht.The present invention is intended to remedy this. The object of the invention is to develop a heating device of the type mentioned at the outset in such a way that the transition between different power levels is practically silent.
Gelöst wird diese Aufgabe dadurch, daß bei einem Übergang von einer Leistungsstufe auf eine andere ein gleitender Übergang vorgesehen ist.This object is achieved in that a smooth transition is provided in the case of a transition from one power level to another.
"Gleitender Übergang" bedeutet hier insbesondere die Abkehr von der sprunghaften Än¬ derung der Drehzahl des Verbrennungsluflgebläses. Nimmt die Drehzahl des Verbren¬ nungsluflgebläses beispielsweise von einem hohen Wen bei Vollast auf einen nur etwa halb so großen Wen bei Teillast ab, so geschieht der "gleitende Übergang" innerhalb ei¬ nes Zeitintervalls von beispielsweise einer Minute. Auch bei einer Drehzahlzunahme ist ein entsprechend zeitlich langer Übergangsbereich vorgesehen.“Sliding transition” here means in particular the departure from the sudden change in the speed of the combustion air fan. If the speed of the combustion air blower decreases, for example, from a high Wen at full load to a half of Wen at partial load, the "smooth transition" takes place within a time interval of, for example, one minute. A correspondingly long transition area is also provided when the speed increases.
Es hat sich überraschenderweise gezeigt, daß durch einen solchen allmählichen Über¬ gang von einer Leistungsstufe auf die andere die Drehzahländerung des Verbrennungs¬ luflgebläses praktisch geräuschlos und unbemerkt vonstatten geht. Mit dem gleitenden Übergang der Drehzahl des Verbrennungsluflgebläses von einem Wert auf einen anderen kann auch der Übergang der Leistung der Brennstofipumpe nicht - wie bisher üblich - abrupt, sondern allmählich erfolgen.Surprisingly, it has been shown that such a gradual transition from one power stage to the other makes the speed change of the combustion air blower practically noiseless and unnoticed. With the smooth transition of the speed of the combustion air blower from one value to another, the transition of the output of the fuel pump can also not take place abruptly, as was previously the case, but gradually.
ERSATZBLÄΓT (REGEL 26) In einem Grenzfall ist der Übergang von einer Drehzahl zur anderen des Verbrennungs¬ luflgebläses derart lang ausgedehnt, daß die angestrebte Leistungsstufe (Drehzahl des Verbrennungsluflgebläses) gar nicht erreicht wird, sondern vorher noch ein erneutes Umschalten im Sine eines Rückschaltens erfolgt, so daß nach beispielsweise einer all¬ mählichen Abnahme der Drehzahl des Verbrennungsluflgebläses eine nachfolgende all¬ mähliche Zunahme der Drehzahl des Gebläses stattfindet, und umgekehrt. SPARE BLADE (RULE 26) In a borderline case, the transition from one speed to the other of the combustion air blower is extended so long that the desired power level (speed of the combustion air blower) is not reached at all, but before that there is yet another switchover so that after a downshift, for example gradual decrease in the speed of the combustion air fan, a subsequent gradual increase in the speed of the fan takes place, and vice versa.
Im folgenden wird ein Ausführungsbeispiel der Erfindung anhand der Zeichnung näher erläutert. Es zeigen:An exemplary embodiment of the invention is explained in more detail below with reference to the drawing. Show it:
Fig. 1 ein Blockschaltbild einer Heizeinrichtung für Fahrzeuge, undFig. 1 is a block diagram of a heater for vehicles, and
Fig. 2 verschiedene Drehzahlverläufe bei einem Verbrennungsluflgebläse einer Heizein¬ richtung.Fig. 2 different speed curves in a combustion air fan of a heating device.
Der in Fig. 1 dargestellte Aufbau einer Heizeinrichtung für Fahrzeuge ist an sich be¬ kannt.The construction of a heating device for vehicles shown in FIG. 1 is known per se.
Ein Brenner 2 enthält zum Erzeugen einer Flamme in einer Brennkammer 4 eine Brenn- stofizuleitung 6 mit einer Brennstoffpumpe 8 zum Zuführen von Brennstoff zu einem hier nicht dargestellten Verdampfer, Zerstäuber oder einer anderen vergleichbaren Ein¬ richtung. Ein Verbrennungsluflgebläse 10 dient zum Zuführen von Verbrennungslufl entsprechend der dargestellten Pfeilrichtung. Von einer Zündvorrichtung 12 wird am Anfang eines Betriebszyklus das Brennstoff-/Lufl-Gemisch entzündet, so daß in einem Flammrohr 14 der Brennkammer 4 eine Flamme entsteht. Die Abgase entweichen über einen Abgaskanal 16.In order to generate a flame in a combustion chamber 4, a burner 2 contains a fuel feed line 6 with a fuel pump 8 for supplying fuel to an evaporator, atomizer or other comparable device (not shown here). A combustion air blower 10 serves to supply combustion air in accordance with the direction of the arrow shown. The fuel / air mixture is ignited by an ignition device 12 at the beginning of an operating cycle, so that a flame is produced in a flame tube 14 of the combustion chamber 4. The exhaust gases escape through an exhaust duct 16.
Das Flammrohr 14 ist von einem Wassermantel 18 umgeben, in welchem das als Wärme¬ träger dienende Wasser von einer Pumpe 20 umgewälzt wird. Im Bereich eines Was¬ seraustritts 22 wird die Temperatur des Wassers von einem Temperaturfühler 24 erfaßt. Der Temperaturfühler gibt entsprechende Signale an eine Heizleistungs-Regelschaltung 26.The flame tube 14 is surrounded by a water jacket 18, in which the water serving as heat carrier is circulated by a pump 20. The temperature of the water is detected by a temperature sensor 24 in the area of a water outlet 22. The temperature sensor sends corresponding signals to a heating power control circuit 26.
Die Anordnung des Flammrohrs 14 und des Wassermantels 18 bildet einen Wärmetau¬ scher 18, der für den Wärmeübergang von den Verbrennungsgasen auf das in dem Was¬ sermantel 18 befindliche Wasser sorgt. Das in Pfeilrichtung strömende Wasser wird von einem rechts in Fig. 1 dargestellten Wasser/Luft- Wärmetauscher 28 abgekühlt. Die da- bei von dem Wärmetauscher 28 kommende warme Luft gelangt in einen hier strichpunk¬ tiert dargestellten Fahrgastraum.The arrangement of the flame tube 14 and the water jacket 18 forms a heat exchanger 18 which ensures the heat transfer from the combustion gases to the water in the water jacket 18. The water flowing in the direction of the arrow is cooled by a water / air heat exchanger 28 shown on the right in FIG. 1. That one- when warm air coming from the heat exchanger 28 reaches a passenger compartment shown here in dash-dotted lines.
Fig. 2 zeigt bei " A" den zeitlichen Verlauf der Gebläsedrehzahl des links unten in Fig. 1 dargestellten Verbrennungsluflgebläses 10. Es erfolgt ein ständiger Wechsel zwischen Vollast (VL) und Teillast (TL). Dieser Verlauf entspricht dem Stand der Technik, weil das Umschalten innerhalb der Heizieistungsregelschaltung 26 entweder über ein Relais oder über einen Halbleiterschalter erfolgt. Die dabei auftretenden Schaltgeräusche sowie die Geräusche bei der relativ schnellen Drehzahländerung des Verbrennungsluflgebläses sollen erfindungsgemäß beseitigt werden.2 shows at "A" the time course of the fan speed of the combustion air fan 10 shown at the bottom left in FIG. 1. There is a constant change between full load (VL) and part load (TL). This course corresponds to the prior art, because the switching within the heating power control circuit 26 takes place either via a relay or via a semiconductor switch. The switching noises that occur as well as the noises during the relatively rapid change in speed of the combustion air blower are to be eliminated according to the invention.
Gemäß Fig. 2 "B" erfolgt der Übergang der Gebläsedrehzahl von Vollast (VL) auf Teil¬ last (TL) allmählich, z.B. innerhalb einer Zeitspanne von mehr als etwa einer Minute. Umgekehrt erfolgt auch der Übergang zwischen Teillast (TL) und Vollast (VL) allmäh¬ lich, z.B. innerhalb eines Zeitraums von etwa einer Minute.According to Fig. 2 "B" the transition of the fan speed from full load (VL) to partial load (TL) takes place gradually, e.g. within a period of more than about a minute. Conversely, the transition between partial load (TL) and full load (VL) also takes place gradually, e.g. within a period of about a minute.
Außer der Drehzahl des Verbrennungsluflgebläses 10 erfolgt eine Leistungsänderung bei der Brennstofipumpe 8; da diese jedoch hinsichtlich der Betriebsgeräusche unkritisch ist, spielt sie hier keine besondere Rolle.In addition to the speed of the combustion air blower 10, there is a change in output in the fuel pump 8; however, since this is not critical with regard to operating noise, it does not play a special role here.
Fig. 2 zeigt bei "C" einen Spezialfall der erfindungsgemäßen Heizeinrichtung bzw. des Betriebs der Heizeinrichtung. Der "allmähliche Übergang" der Gebläsedrehzahl von ei¬ nem der Vollast entsprechenden Wert auf einen der Teillast entsprechenden Wert ist derart flach, das heißt, die "Zeitkonstante" für den Abfall der Drehzahl ist derart groß, daß möglicherweise ein erneutes Umschalten im Sinne einer Erhöhung der Leistung stattfindet, bevor die untere Leistungsstufe überhaupt erreicht wird. Durch entsprechen¬ de Einstellung der Zeitkonstanten, die für die Länge des Übergangs zwischen den ver¬ schiedenen Leistungsstufen maßgeblich ist, kann man also einen quasi-anaiogen Regel¬ betrieb erreichen. Die in Fig. 1 dargestellte Heizieistungsregelschaltung enthält entsprechende Schal¬ tungselemente, mit denen die in Fig. 2B und Fig. 2C dargestellten allmählichen Über¬ gänge realisiert werden. Insbesondere ist in der Heizleistungsschaltung 26 ein Mikropro¬ zessor vorgesehen, der den gewünschten Verlauf der Drehzahl des Verbrennungsluflge¬ bläses einstellt. 2 shows at "C" a special case of the heating device according to the invention or the operation of the heating device. The "gradual transition" of the fan speed from a value corresponding to the full load to a value corresponding to the partial load is so flat, that is to say the "time constant" for the drop in the speed is so great that a renewed switchover in the sense of an increase may be possible performance takes place before the lower performance level is reached. By setting the time constant accordingly, which is decisive for the length of the transition between the different power levels, quasi-analog control operation can be achieved. The heating power control circuit shown in FIG. 1 contains corresponding circuit elements with which the gradual transitions shown in FIGS. 2B and 2C are implemented. In particular, a microprocessor is provided in the heating power circuit 26, which adjusts the desired course of the speed of the combustion air blower.

Claims

Patentansprüche claims
1. Heizeinrichtung für Fahrzeuge, mit einem Brenner (2), der eine BrennstoSzufüh¬ reinrichtung (6,8) und ein Verbrennungsluflgebläse (10) aufweist, und einer Heizleistungs-Regelvorrichtung (26), wobei eine Umschaltung zwischen ver¬ schiedenen Leistungsstufen (VL,TL) möglich ist, bei denen das Verbrennungs¬ luflgebläse (10) jeweils mit einer vorbestimmten Drehzahl läuft, dadurch gekennzeichnet, daß bei einem Übergang von einer Leistungsstufe auf eine andere ein gleitender1. Heating device for vehicles, with a burner (2), which has a fuel supply device (6, 8) and a combustion air blower (10), and a heating power control device (26), with a switchover between different power levels (VL , TL) is possible, in which the combustion air blower (10) runs in each case at a predetermined speed, characterized in that when moving from one power level to another a smooth one
Übergang vorgesehen ist.Transition is provided.
2. Heizeinrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Regelvorrichtung (26) eine Mikroprozessorsteuerung aufweist, und daß der Übergang von einer Leistungsstufe auf die andere zeitlich linear erfolgt.2. Heating device according to claim 1, characterized in that the control device (26) has a microprocessor control, and that the transition from one power level to the other is linear in time.
J . Heizeinrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Übergang in einem Intervall der Größenordnung von mehr als einer Mi¬ nute erfolgt. J. Heating device according to claim 1 or 2, characterized in that the transition takes place in an interval of the order of more than one minute.
EP94921648A 1993-07-14 1994-07-14 Heater for use in vehicles Withdrawn EP0708903A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4323586 1993-07-14
DE4323586A DE4323586C2 (en) 1993-07-14 1993-07-14 Vehicle heater
PCT/EP1994/002330 WO1995002790A1 (en) 1993-07-14 1994-07-14 Heater for use in vehicles

Publications (1)

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EP0708903A1 true EP0708903A1 (en) 1996-05-01

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EP94921648A Withdrawn EP0708903A1 (en) 1993-07-14 1994-07-14 Heater for use in vehicles

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EP (1) EP0708903A1 (en)
JP (1) JPH09502510A (en)
CN (1) CN1127033A (en)
CA (1) CA2167204A1 (en)
CZ (1) CZ10696A3 (en)
DE (1) DE4323586C2 (en)
WO (1) WO1995002790A1 (en)

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DE19511545C2 (en) * 1995-03-09 2003-08-21 Eberspaecher J Gmbh & Co Process for the consumption and noise-optimized power control of a burner of a heater
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DE10125589A1 (en) * 2001-05-25 2002-12-05 Webasto Thermosysteme Gmbh Device for providing supplementary heating in a motor vehicle detects level of noise to increase levels of passenger comfort in the vehicle
DE102004027569B4 (en) * 2004-06-04 2006-05-04 Webasto Ag Process to operate vehicle heating burning fuel as heat source delivers fuel at low rate on reduced power
DE102007007122A1 (en) * 2007-02-13 2008-08-14 J. Eberspächer GmbH & Co. KG Fuel operated vehicle heater e.g. independent vehicle heater, operating method, involves controlling air conveying arrangement based on operating parameter, and controlling fuel conveying arrangement based on another operating parameter
CH700427B1 (en) * 2007-09-12 2010-08-31 Thermmix Ag A method of controlling an evaporative burner.
DE102011087971B4 (en) 2011-12-08 2021-03-04 Eberspächer Climate Control Systems GmbH Method for operating a heater that can be operated with hydrocarbon fuel
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Also Published As

Publication number Publication date
CA2167204A1 (en) 1995-01-26
DE4323586A1 (en) 1995-01-19
DE4323586C2 (en) 1998-01-29
WO1995002790A1 (en) 1995-01-26
JPH09502510A (en) 1997-03-11
CN1127033A (en) 1996-07-17
CZ10696A3 (en) 1996-07-17

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