DE10042496A1 - Internal combustion engine has temperature sensor arranged in heat circulation behind heating heat exchanger such that temperature sensor is connected to controller together with another temperature sensor - Google Patents

Internal combustion engine has temperature sensor arranged in heat circulation behind heating heat exchanger such that temperature sensor is connected to controller together with another temperature sensor

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Publication number
DE10042496A1
DE10042496A1 DE10042496A DE10042496A DE10042496A1 DE 10042496 A1 DE10042496 A1 DE 10042496A1 DE 10042496 A DE10042496 A DE 10042496A DE 10042496 A DE10042496 A DE 10042496A DE 10042496 A1 DE10042496 A1 DE 10042496A1
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DE
Germany
Prior art keywords
coolant
temperature sensor
circuit
combustion engine
internal combustion
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.)
Ceased
Application number
DE10042496A
Other languages
German (de)
Inventor
Soenke Driller
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.)
Volkswagen AG
Original Assignee
Volkswagen AG
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 Volkswagen AG filed Critical Volkswagen AG
Priority to DE10042496A priority Critical patent/DE10042496A1/en
Publication of DE10042496A1 publication Critical patent/DE10042496A1/en
Ceased legal-status Critical Current

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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
    • B60H1/02—Heating, cooling or ventilating [HVAC] devices the heat being derived from the propulsion plant
    • B60H1/03—Heating, cooling or ventilating [HVAC] devices the heat being derived from the propulsion plant and from a source other than the propulsion plant
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P3/00—Liquid cooling
    • F01P3/20—Cooling circuits not specific to a single part of engine or machine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00—Controlling of coolant flow
    • F01P7/14—Controlling of coolant flow the coolant being liquid
    • F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
    • F01P7/165—Controlling of coolant flow the coolant being liquid by thermostatic control characterised by systems with two or more loops
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P5/00—Pumping cooling-air or liquid coolants
    • F01P5/10—Pumping liquid coolant; Arrangements of coolant pumps
    • F01P2005/105—Using two or more pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P5/00—Pumping cooling-air or liquid coolants
    • F01P5/10—Pumping liquid coolant; Arrangements of coolant pumps
    • F01P5/12—Pump-driving arrangements
    • F01P2005/125—Driving auxiliary pumps electrically
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00—Controlling of coolant flow
    • F01P7/14—Controlling of coolant flow the coolant being liquid
    • F01P2007/146—Controlling of coolant flow the coolant being liquid using valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2025/00—Measuring
    • F01P2025/08—Temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2025/00—Measuring
    • F01P2025/08—Temperature
    • F01P2025/30—Engine incoming fluid temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2025/00—Measuring
    • F01P2025/08—Temperature
    • F01P2025/50—Temperature using two or more temperature sensors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2060/00—Cooling circuits using auxiliaries
    • F01P2060/08—Cabin heater
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2060/00—Cooling circuits using auxiliaries
    • F01P2060/18—Heater

Landscapes

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

Abstract

The internal combustion engine includes a temperature sensor (6) which is arranged in a heat circulation (9) and behind a heating heat exchanger (15). The temperature sensor is connected to a controller (14) together with another temperature sensor (5). The temperature sensor is provided to the return path of an inner cooling circuit (4) and installed in the region of a thermostat valve (7). An Independent claim is also included for a liquid cooling operating method for internal combustion engine.

Description

Die Erfindung betrifft eine Brennkraftmaschine mit Flüssigkeitskühlung und einer Kühlmittelzusatzheizung sowie ein Arbeitsverfahren einer solchen Flüssigkeitskühlung gemäß den Oberbegriffen der Ansprüche 1 und 4.The invention relates to an internal combustion engine with liquid cooling and Additional coolant heating and a working method of such a liquid cooling according to the preambles of claims 1 and 4.

Zur Steigerung des Komforts und zur Gewährleistung eines zuverlässigen Startverhaltens eines Fahrzeugmotors ist es bekannt, bei Brennkraftmaschinen mit Flüssigkeitskühlung eine Kühlmittelzusatzheizung im Kühlmittelkreislauf anzuordnen, DE 39 00 255 A1, die innerhalb eines inneren Kühlmittelkreislaufes in einem separaten Heizungskreislauf angeordnet ist, um motorunabhängig einen Heizungswärmetauscher zur Erwärmung des Fahrgastraumes zu betreiben.To increase comfort and ensure reliable Starting behavior of a vehicle engine is known in internal combustion engines To arrange an additional coolant heater in the coolant circuit, DE 39 00 255 A1, which is within an internal coolant circuit in a separate Heating circuit is arranged around a heating heat exchanger independently of the engine to operate to warm the passenger compartment.

Nachteile an den bekannten Kühlmittelzusatzheizungen treten vor allen Dingen beim Kaltstart einer Brennkraftmaschine auf, bei dem sich kaltes Kühlmittel aus dem Motorblock mit warmem Kühlmittel aus dem Heizkreislauf vermischt, so dass es zu Irritationen eines elektronischen Motormanagements mit Aufleuchten der On-Bord- Diagnose-Kontrollleuchten und auch zu einem schlechten Starverhalten einer Brennkraftmaschine führen kann, wobei dieses Problem teilweise durch ein Aufweiten des Kennfeldes der On-Bord-Diagnose zu lösen versucht wird, welches jedoch das Starverhalten nicht verbessert, die Abgaswerte hingegen verschlechtert.Disadvantages of the known additional coolant heaters occur above all Cold start of an internal combustion engine, in which cold coolant flows out of the Engine block mixed with warm coolant from the heating circuit, causing it to Irritation of an electronic engine management with lighting of the on-board Diagnostic indicator lights and also for poor starter behavior Internal combustion engine can cause this problem in part by widening the map of the on-board diagnosis is attempted to solve, which however Starling behavior not improved, but the exhaust gas values worsened.

Aufgabe der Erfindung ist es, negative Einflüsse einer Kühlmittelzusatzheizung auf eine Motorsteuerung, insbesondere auf die Abgaswerte und das Startverhalten einer Brennkraftmaschine zu verhindern.The object of the invention is to have negative effects of an additional coolant heater on a Engine control, in particular on the exhaust gas values and the starting behavior of a To prevent internal combustion engine.

Die Lösung dieser Aufgabe wird in Verbindung mit den Oberbegriffsmerkmalen erfindungsgemäß durch die in den kennzeichnenden Teilen der beiden Patentansprüche angegebenen technischen Lehren vermittelt. The solution to this problem is in connection with the generic terms according to the invention in the characterizing parts of the two claims given technical teachings.  

Durch die Anordnung eines zweiten Temperaturfühlers im Heizungskreislauf, welcher gemeinsam mit dem ersten Temperaturfühler über eine Steuereinheit entsprechende Ventile stellt, ist es möglich, bei einem Kaltstart einer Brennkraftmaschine ein Zusammenschalten des gesamten inneren Kühlkreislaufes so lange zu verhindern, bis die Kühlmitteltemperatur im Rücklauf eines kleinen inneren Kühlmittelkreislaufes mit der Temperatur des Kühlmittels im Rücklauf des Heizkreislaufes übereinstimmt, sodass die Motorelektronik keine falschen oder sich widersprechende Ausgangsdaten erhält.By arranging a second temperature sensor in the heating circuit, which together with the first temperature sensor via a control unit Valves sets, it is possible when a cold start of an internal combustion engine Prevent interconnection of the entire internal cooling circuit until the coolant temperature in the return of a small internal coolant circuit with the Temperature of the coolant in the return of the heating circuit matches, so that Motor electronics does not receive incorrect or contradicting output data.

Der zweite Temperaturfühler ist dabei bevorzugterweise hinter dem Heizungswärmetauscher angeordnet, der zusammen mit dem ersten Temperaturfühler, welcher im Bereich des Thermostatventils eingebaut ist, an ein Steuergerät angeschlossen ist, welches separat oder als Teil des Motorsteuergerätes ausgebildet sein kann. In Strömungsrichtung hinter dem zweiten Temperaturfühler ist ein Umschaltventil in den Kühlmittelkreislauf eingesetzt, welches das Kühlmittel des Heizkreislaufes bei unterschiedlichen Temperaturen der Kühlmittel aus dem Rücklauf in den Vorlauf des Heizkreislaufes zurückführt. Erst wenn beide Kühlmitteltemperaturen in den jeweiligen Rückläufen übereinstimmen, wird das Sperrventil in der Bypassleitung des kleinen inneren Kühlmittelkreislaufes geschlossen und das Umschaltventil so geschaltet, dass der gesamte innere Kühlkreislauf von dem Kühlmittel durchflossen wird. Damit wird vermieden, dass das warme Wasser der Standheizung die Diagnose bzw. die Motorsteuerung derart beeinflusst, dass das Steuergerät von einer warmen Brennkraftmaschine ausgeht, obwohl diese in Wirklichkeit noch kalt ist.The second temperature sensor is preferably behind the Heating heat exchanger arranged, which together with the first temperature sensor, which is installed in the area of the thermostatic valve to a control unit is connected, which is formed separately or as part of the engine control unit can be. In the direction of flow behind the second temperature sensor is a Changeover valve used in the coolant circuit, which is the coolant of the Heating circuit at different coolant temperatures from the return in returns the flow of the heating circuit. Only when both coolant temperatures in the respective returns, the check valve in the bypass line of the small internal coolant circuit closed and the switching valve switched so that the entire internal cooling circuit is flowed through by the coolant. So that will avoided that the warm water of the parking heater made the diagnosis or Engine control influences such that the control unit from a warm Internal combustion engine runs out, although in reality it is still cold.

Nachfolgend ist ein Ausführungsbeispiel der Erfindung anhand einer Prinzipskizze näher beschrieben. Es zeigen:An exemplary embodiment of the invention is described in more detail below on the basis of a schematic diagram described. Show it:

Fig. 1 eine Prinzipdarstellung eines Kühlmittelkreislaufes in einer ersten Betriebsstellung mit zugeschaltetem Heizkreislauf und Fig. 1 shows a schematic diagram of a coolant circuit in a first operating position with the heating circuit switched on and

Fig. 2 eine Prinzipdarstellung analog zur Fig. 1 in einer zweiten Betriebsstellung mit getrenntem Heizkreislauf. Fig. 2 is a schematic diagram analogous to Fig. 1 in a second operating position with a separate heating circuit.

Die Brennkraftmaschine 1 weist einen äußeren Kühlmittelkreislauf 3 auf, in dem ein Kühler 13 angeordnet ist, wobei dieser äußere Kühlkreislauf 3 erst nach Erreichen einer Grenztemperatur über ein Thermostatventil 7 mit dem inneren Kühlkreislauf 4 verbunden wird.The internal combustion engine 1 has an outer coolant circuit 3 , in which a cooler 13 is arranged, this outer cooling circuit 3 being connected to the inner cooling circuit 4 via a thermostatic valve 7 only after a limit temperature has been reached.

Der innere Kühlkreislauf 4 weist einen kleinen inneren Kühlkreislauf 18 und einen Heizkreislauf 9 auf, welche so lange voneinander getrennt sind, bis die Temperaturen des Kühlmittels in den jeweiligen Rückläufen übereinstimmen. Der kleine innere Kühlmittelkreislauf 18 beginnt im Austritt aus der Brennkraftmaschine und führt über eine Bypassleitung 17, in der ein Sperrventil 11 eingesetzt ist, wieder zurück in die Brennkraftmaschine 1.The inner cooling circuit 4 has a small inner cooling circuit 18 and a heating circuit 9 , which are separated from one another until the temperatures of the coolant in the respective returns match. The small internal coolant circuit 18 begins at the outlet from the internal combustion engine and leads back into the internal combustion engine 1 via a bypass line 17 in which a shut-off valve 11 is inserted.

Der Heizkreislauf 9 schließt sich an den kleinen inneren Kühlmittelkreislauf 18 an und besitzt eine Zusatzpumpe 8, mit der der Heizkreislauf 9 auch ohne sich in Betrieb befindlicher Brennkraftmaschine erzeugt werden kann. Die Zusatzpumpe 8 bewegt das Kühlmittel durch eine Kühlmittelzusatzheizung 2 und einen Heizungswärmetauscher 15, der seine Wärme in den Fahrgastraum abgibt. In Bewegungsrichtung des Kühlmittels ist dahinter ein zweiter Temperaturfühler 6 eingesetzt, der ebenso wie ein erster Temperaturfühler 5, welcher im Bereich des Thermostatventils 7 eingesetzt ist, mit einem Steuergerät 14 verbunden, welches als separates Steuergerät oder als Teil des Motorsteuergerätes ausgebildet sein kann.The heating circuit 9 connects to the small inner coolant circuit 18 and has an additional pump 8 with which the heating circuit 9 can also be generated without an internal combustion engine being in operation. The auxiliary pump 8 moves the coolant through an additional coolant heater 2 and a heating heat exchanger 15 , which emits its heat into the passenger compartment. In the direction of movement of the coolant, a second temperature sensor 6 is inserted behind it, which, like a first temperature sensor 5 , which is used in the area of the thermostatic valve 7 , is connected to a control unit 14 , which can be designed as a separate control unit or as part of the engine control unit.

Dieses Steuergerät 14 steuert nach einem Kaltstart der Brennkraftmaschine 1 und vorher in Betrieb befindlicher Kühlmittelzusatzheizung 2 ein Umschaltventil 12 zunächst so, dass das Kühlmittel aus dem Heizkreislauf 9 in den Vorlauf vor die Pumpe 8 umgeleitet ist und ein Sperrventil 11 geöffnet ist, wodurch die beiden separaten Kreisläufe erzeugt werden. Bei Temperaturgleichheit in den Rückläufen steuert das Steuergerät 14 das Umschaltventil 12 so, dass das Kühlmittel zurück in Richtung auf die Brennkraftmaschine 1 geleitet wird, worauf das Sperrventil 11 geschlossen wird, sodass nun der vollständige innere Kühlkreislauf 4 zusammengeschaltet ist.After a cold start of the internal combustion engine 1 and previously operating coolant auxiliary heater 2, this control unit 14 controls a changeover valve 12 so that the coolant is diverted from the heating circuit 9 into the flow before the pump 8 and a shut-off valve 11 is opened, as a result of which the two separate ones Cycles are generated. If the temperatures in the returns are the same, the control unit 14 controls the changeover valve 12 in such a way that the coolant is directed back towards the internal combustion engine 1 , whereupon the shutoff valve 11 is closed, so that the complete inner cooling circuit 4 is now interconnected.

Claims (5)

1. Brennkraftmaschine mit Flüssigkeitskühlung, mit einem inneren Kühlmittelkreislauf (4) mit einem Heizungswärmetauscher (15) und einem ersten Temperaturfühler (5) im Rücklauf des inneren Kühlmittelkreislaufes (4) und mit einer Kühlmittelzusatzheizung (2), einer Zusatzpumpe (8) zur Erzeugung eines inneren Heizkreislaufes (9) bei stehender Brennkraftmaschine und mit einer Verbindungsleitung als separaten Rücklauf (16) in den Heizkreislauf, dadurch gekennzeichnet, dass hinter dem Heizungswärmetauscher (15) ein zweiter Temperaturfühler (6) angeordnet ist, der zusammen mit dem ersten Temperaturfühler (5) an ein Steuergerät (14) angeschlossen ist.1. Internal combustion engine with liquid cooling, with an inner coolant circuit ( 4 ) with a heating heat exchanger ( 15 ) and a first temperature sensor ( 5 ) in the return of the inner coolant circuit ( 4 ) and with an additional coolant heater ( 2 ), an additional pump ( 8 ) for generating a internal heating circuit ( 9 ) when the internal combustion engine is at a standstill and with a connecting line as a separate return ( 16 ) into the heating circuit, characterized in that a second temperature sensor ( 6 ) is arranged behind the heating heat exchanger ( 15 ), which together with the first temperature sensor ( 5 ) is connected to a control unit ( 14 ). 2. Brennkraftmaschine nach Anspruch 1, dadurch gekennzeichnet, dass in Strömungsrichtung hinter dem Temperaturfühler (6) ein Umschaltventil (12) angeordnet ist, welches in einem ersten Schaltzustand das Kühlmittel durch den separaten Rücklauf (16) in den Vorlauf des Heizkreislaufes (9) und in einem zweiten Schaltzustand das Kühlmittel in den inneren Kühlkreislauf (4) zurückführt.2. Internal combustion engine according to claim 1, characterized in that a changeover valve ( 12 ) is arranged in the flow direction behind the temperature sensor ( 6 ), which in a first switching state, the coolant through the separate return ( 16 ) in the flow of the heating circuit ( 9 ) and in a second switching state, the coolant returns to the inner cooling circuit ( 4 ). 3. Brennkraftmaschine nach Anspruch 1 und 2, dadurch gekennzeichnet, dass im inneren Kühlmittelkreislauf (4) vor dem Heizkreislauf (9) ein Bypass (17) mit einem Sperrventil (11) zum Rücklauf des inneren Kühlmittelkreislaufs (4) angeordnet ist und etwa bei Temperaturgleichheit des Kühlmittels in den jeweiligen Rückläufen das Umschaltventil (12) zum inneren Kühlmittelkreislauf (4) hin auf- und das Sperrventil (11) zugesteuert ist und bei höherer Temperatur des Kühlmittels des Heizkreislaufes (9), das Umschaltventil (12) zum Heizkreislauf (9) auf- und das Sperrventil (11) ebenfalls aufgesteuert ist.3. Internal combustion engine according to claim 1 and 2, characterized in that in the inner coolant circuit ( 4 ) upstream of the heating circuit ( 9 ) a bypass ( 17 ) with a check valve ( 11 ) for returning the inner coolant circuit ( 4 ) is arranged and approximately in the same temperature of the coolant in the respective returns, the changeover valve ( 12 ) to the inner coolant circuit ( 4 ) is open and the shut-off valve ( 11 ) is activated and, at a higher temperature of the coolant of the heating circuit ( 9 ), the changeover valve ( 12 ) to the heating circuit ( 9 ) and the check valve ( 11 ) is also opened. 4. Arbeitsverfahren einer Flüssigkeitskühlung einer Brennkraftmaschine mit Kühlmittelzusatzheizung gemäß Anspruch 1, dadurch gekennzeichnet, dass im kalten Zustand bei Stillstand oder Kaltstart einer Brennkraftmaschine (1) und eingeschalteter Kühlmittelzusatzheizung (2) ein Teil des inneren Kühlmittelkreislaufes (4) als Heizkreislauf (9) geschaltet wird, in dem Kühlmittel von einer Zusatzpumpe (8) durch eine Kühlmittelzusatzheizung (2) und einen Heizungswärmetauscher (15) an einem zweiten Temperaturfühler (6) vorbei gepumpt wird und nach einem Kaltstart kaltes Kühlmittel durch einen Bypass (17) an einem ersten Temperaturfühler vorbei in einen kleinen inneren Kühlmittelkreislauf (18) zu einer Brennkraftmaschine (1) zurückgefördert wird, wobei die Temperaturfühler (5, 6) mit einem Steuergerät (14) verbunden sind, über welches bei Erreichen gleicher Kühlmitteltemperaturen ein Umschaltventil (12) im Rücklauf (10) die Förderrichtung des Kühlmittels in Richtung auf die Brennkraftmaschine (1) ändert und ein Sperrventil (11) im Bypass (17) schließt.4. Working method of liquid cooling of an internal combustion engine with additional coolant heating according to claim 1, characterized in that in the cold state when the internal combustion engine ( 1 ) is at a standstill or cold started and the additional coolant heating ( 2 ) is switched on, part of the internal coolant circuit ( 4 ) is switched as a heating circuit ( 9 ) , in which coolant is pumped by an additional pump ( 8 ) through an additional coolant heater ( 2 ) and a heating heat exchanger ( 15 ) past a second temperature sensor ( 6 ) and after a cold start, cold coolant through a bypass ( 17 ) past a first temperature sensor a small internal coolant circuit ( 18 ) is returned to an internal combustion engine ( 1 ), the temperature sensors ( 5 , 6 ) being connected to a control unit ( 14 ), via which a changeover valve ( 12 ) in the return line ( 10 ) when the coolant temperatures have reached the same level Delivery direction of the K coolant in the direction of the internal combustion engine ( 1 ) changes and a shut-off valve ( 11 ) in the bypass ( 17 ) closes. 5. Arbeitsverfahren nach Anspruch 4, dadurch gekennzeichnet, dass bei sehr kalten Umgebungstemperaturen im Bereich um oder unterhalb des Gefrierpunktes von Wasser und bei Inbetriebnahme der Kühlmittelzusatzheizung das Umschaltventil (12) und das Sperrventil (11) bis zu einer Mindesttemperatur des Kühlmittels aufgesteuert werden.5. Working method according to claim 4, characterized in that at very cold ambient temperatures in the area around or below the freezing point of water and when starting the additional coolant heating, the changeover valve ( 12 ) and the shut-off valve ( 11 ) are opened up to a minimum temperature of the coolant.
DE10042496A 2000-08-30 2000-08-30 Internal combustion engine has temperature sensor arranged in heat circulation behind heating heat exchanger such that temperature sensor is connected to controller together with another temperature sensor Ceased DE10042496A1 (en)

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DE10042496A DE10042496A1 (en) 2000-08-30 2000-08-30 Internal combustion engine has temperature sensor arranged in heat circulation behind heating heat exchanger such that temperature sensor is connected to controller together with another temperature sensor

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DE10042496A DE10042496A1 (en) 2000-08-30 2000-08-30 Internal combustion engine has temperature sensor arranged in heat circulation behind heating heat exchanger such that temperature sensor is connected to controller together with another temperature sensor

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Cited By (4)

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Publication number Priority date Publication date Assignee Title
FR2846715A1 (en) * 2002-11-04 2004-05-07 Valeo Climatisation Device supplying heat to automobile engine cooling loop comprises circuit connecting fluid outlet from engine to principal valve allowing passage of fluid to second circuit comprising heat exchanger cooling fluid before return to engine
DE10323900A1 (en) * 2003-05-26 2005-01-05 J. Eberspächer GmbH & Co. KG Multi-way valve for a vehicle cooling / heating system
DE10343775A1 (en) * 2003-09-18 2005-05-19 Volkswagen Ag Heating and cooling unit for passenger cabin driven by cooling system of engine, comprising additional independent electric pump
DE102008004133A1 (en) 2008-01-11 2009-07-16 Volkswagen Ag Heating device for motor vehicle, has heating circuit provided with heat exchanger arranged in exhaust gas discharge pipe between exhaust gas outlet of internal-combustion engine and surrounding outlet

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DE3544023A1 (en) * 1985-12-13 1987-06-19 Webasto Werk Baier Kg W VEHICLE HEATING
DE3900255A1 (en) * 1989-01-05 1990-07-12 Webasto Ag Fahrzeugtechnik METHOD FOR OPERATING A VEHICLE HEATING SYSTEM AND VEHICLE HEATING SYSTEM
DE19906523A1 (en) * 1999-02-17 2000-08-31 Volkswagen Ag Heating circuit for motor vehicles

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3544023A1 (en) * 1985-12-13 1987-06-19 Webasto Werk Baier Kg W VEHICLE HEATING
DE3900255A1 (en) * 1989-01-05 1990-07-12 Webasto Ag Fahrzeugtechnik METHOD FOR OPERATING A VEHICLE HEATING SYSTEM AND VEHICLE HEATING SYSTEM
DE19906523A1 (en) * 1999-02-17 2000-08-31 Volkswagen Ag Heating circuit for motor vehicles

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2846715A1 (en) * 2002-11-04 2004-05-07 Valeo Climatisation Device supplying heat to automobile engine cooling loop comprises circuit connecting fluid outlet from engine to principal valve allowing passage of fluid to second circuit comprising heat exchanger cooling fluid before return to engine
DE10323900A1 (en) * 2003-05-26 2005-01-05 J. Eberspächer GmbH & Co. KG Multi-way valve for a vehicle cooling / heating system
US7165513B2 (en) 2003-05-26 2007-01-23 J. Eberspacher Gmbh & Co. Kg Multiway valve for a vehicle cooling/heating system
DE10343775A1 (en) * 2003-09-18 2005-05-19 Volkswagen Ag Heating and cooling unit for passenger cabin driven by cooling system of engine, comprising additional independent electric pump
DE102008004133A1 (en) 2008-01-11 2009-07-16 Volkswagen Ag Heating device for motor vehicle, has heating circuit provided with heat exchanger arranged in exhaust gas discharge pipe between exhaust gas outlet of internal-combustion engine and surrounding outlet

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