EP2039903A2 - Method for determining the output of a cooling system - Google Patents

Method for determining the output of a cooling system Download PDF

Info

Publication number
EP2039903A2
EP2039903A2 EP08164380A EP08164380A EP2039903A2 EP 2039903 A2 EP2039903 A2 EP 2039903A2 EP 08164380 A EP08164380 A EP 08164380A EP 08164380 A EP08164380 A EP 08164380A EP 2039903 A2 EP2039903 A2 EP 2039903A2
Authority
EP
European Patent Office
Prior art keywords
cooling system
retarder
temperature
performance
temperature gradient
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Withdrawn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
EP08164380A
Other languages
German (de)
French (fr)
Other versions
EP2039903A3 (en
Inventor
Peter Schmidtner
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.)
ZF Friedrichshafen AG
Original Assignee
ZF Friedrichshafen 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 ZF Friedrichshafen AG filed Critical ZF Friedrichshafen AG
Publication of EP2039903A2 publication Critical patent/EP2039903A2/en
Publication of EP2039903A3 publication Critical patent/EP2039903A3/en
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • 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
    • F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
    • F01P11/14—Indicating devices; Other safety devices
    • F01P11/16—Indicating devices; Other safety devices concerning coolant 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
    • F01P2060/00—Cooling circuits using auxiliaries
    • F01P2060/06—Retarder

Definitions

  • the present invention relates to a method for determining a performance of a cooling system according to the preamble of claim 1.
  • Cooling systems are mounted in different sizes and with different capabilities in vehicles. At a cooling system of a vehicle several applications are connected, for. As engine, retarder and transmission whose control and regulation must be adjusted to the cooling system to prevent overheating of the cooling system. Thus, for each application, multiple controls must be present in order to adapt the applications to the current cooling system. For example, the same retarder with different back-regulation strategies must be provided to work with different-performing cooling systems. Additional controls or regulations for different application and cooling system variants mean additional costs.
  • the cooling liquid of a cooling cooling system of the retarder is heated up. How quickly the temperature drops after switching off the retarder depends on the efficiency of the cooling system. In a high performance cooling system, the temperature will drop quickly and in a lower performance cooling system, the temperature will drop more slowly. Therefore, an inventive method is proposed, in which by determining the temperature gradient of the coolant immediately after a braking of the retarder, the performance of the cooling system is determined. Temperature sensors for determining the temperature of the coolant are present in every cooling system as standard. Thus, the method is both simple and inexpensive, since no additional devices are needed to determine the performance of the cooling system. If the retarder control can determine the performance of the cooling system itself, several feedback control strategies can be preprogrammed in the control, and the control itself selects the feedback control strategy appropriate for the cooling performance of the cooling system.
  • the temperature gradient of the coolant is additionally determined during retarder braking, wherein the determination of the temperature gradient is performed before switching back on.
  • the performance of the cooling system is classified into predefined levels, such as good, medium and poor cooling systems.
  • the measured temperature gradients be stored. An average value is calculated from several consecutively determined and stored temperature gradients.
  • the engine and the engine brake are additionally monitored by already existing CAN signals and their influence on the temperature gradient of the coolant is taken into account.
  • the inventive method determines the performance of the cooling system, it is possible to save different variants of the retarder control. Instead, the retarder control is provided with several different feedback control strategies, the appropriate being selected by the result of the method according to the invention.
  • Fig. 1 and 2 diagrams are recorded in which a temperature T of a coolant of a cooling system of a vehicle is shown in relation to the time t. Until the time t_1 retarder braking is performed and the coolant of the cooling system has a temperature T_1. At time t_1, the retarder is switched off, the temperature T falling to T_2.
  • the temperature gradient dT / dt shows how quickly the cooling system cools down again when the retarder no longer supplies heat in the cooling system.
  • the temperature gradient dT / dt is measured and stored. If at least two temperature gradients dT / dt are stored, an average value of the temperature gradient dT / dt is calculated. The average value is used to determine the performance of the cooling system.
  • the Fig. 1 and 2 show an ideal situation in which neither engine nor engine brake from time t_1 are turned on, but the vehicle rolls out.
  • Fig. 1 the temperature gradient dT / dt is greater than that in Fig. 2 .
  • the controller may be provided with a plurality of alternative feedback control strategies selected depending on the determined performance of the refrigeration system.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Braking Arrangements (AREA)
  • Regulating Braking Force (AREA)
  • Control Of Driving Devices And Active Controlling Of Vehicle (AREA)
  • Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
  • Motor Or Generator Cooling System (AREA)

Abstract

The method involves determining a temperature gradient (dT/ dt) of the cooling medium directly after braking a retarder and during heating the cooling system of retarder before switching of a back regulation of the retarder. The cooling efficiency of the cooling system is determined depending on measurement of the temperature gradient.

Description

Die vorliegende Erfindung betrifft ein Verfahren zur Bestimmung einer Leistungsfähigkeit eines Kühlsystems nach dem Oberbegriff des Anspruchs 1.The present invention relates to a method for determining a performance of a cooling system according to the preamble of claim 1.

Kühlsysteme werden in unterschiedlichen Größen und mit unterschiedlichen Leistungsfähigkeiten in Fahrzeugen montiert. An einem Kühlsystem eines Fahrzeugs werden mehrere Applikationen angeschlossen, z. B. Motor, Retarder und Getriebe, deren Steuerung und Regelung auf das Kühlsystem abgestimmt werden müssen, um eine Überhitzung des Kühlsystem zu vermieden. Somit müssen für jede Applikation mehrere Steuerungen bzw. Regelungen vorhanden sein, um die Appplikationen zum aktuellen Kühlsystem anpassen zu können. Beispielsweise muss der gleiche Retarder mit unterschiedlichen Rückregelungsstrategien vorgesehen werden, um mit unterschiedlich leistungsstarkem Kühlsysteme funktionieren zu können. Zusätzliche Steuerungen bzw. Regelungen für unterschiedliche Applikations- und Kühlsystem-Varianten bedeuten zusätzliche Kosten.Cooling systems are mounted in different sizes and with different capabilities in vehicles. At a cooling system of a vehicle several applications are connected, for. As engine, retarder and transmission whose control and regulation must be adjusted to the cooling system to prevent overheating of the cooling system. Thus, for each application, multiple controls must be present in order to adapt the applications to the current cooling system. For example, the same retarder with different back-regulation strategies must be provided to work with different-performing cooling systems. Additional controls or regulations for different application and cooling system variants mean additional costs.

In der DE 10 2004 040 327 ist eine Vorrichtung und ein Verfahren zur Überwachung der Leistungsfähigkeit eines Kühlsystems eines Fahrzeugs vorgeschlagen. Im Verfahren wird ein Temperaturunterschied an einem Kühlereintritt und einem Kühleraustritt ermittelt, wobei ein Temperatur-Ist-Unterschied mit einem Soll-Unterschied verglichen wird und somit die Leistungsfähigkeit des Kühlsystems bestimmt wird. Das Verfahren setzt voraus, dass die Leistungsfähigkeit des Kühlsystems bekannt ist und bestimmt somit eine Ist-Leistungsfähigkeit eines Kühlsystems im Vergleich mit der Soll-Leistungsfähigkeit des Kühlsystems.In the DE 10 2004 040 327 An apparatus and a method for monitoring the performance of a cooling system of a vehicle is proposed. In the method, a temperature difference at a radiator inlet and a radiator outlet is determined, wherein a temperature-actual difference is compared with a desired difference and thus the performance of the cooling system is determined. The method assumes that the performance of the cooling system is known and thus determines an actual performance of a cooling system as compared to the desired performance of the cooling system.

Daher ist es die Aufgabe der Erfindung, ein einfaches und kostengünstiges Verfahren vorzuschlagen, welches die Leistungsfähigkeit eines Kühlsystems in Verbindung mit einem Retarder bestimmen kann.Therefore, it is the object of the invention to propose a simple and inexpensive method, which can determine the performance of a cooling system in conjunction with a retarder.

Ausgehend von einem Verfahren der eingangs näher genannten Art erfolgt die Lösung dieser Aufgabe mit den Merkmalen des Anspruchs 1; vorteilhafte Ausgestaltungen sind in den Unteransprüchen beschrieben.Based on a method of the type mentioned in more detail, the solution of this problem is carried out with the features of claim 1; advantageous embodiments are described in the subclaims.

Während einer Bremsung mit einem Retarder wird die Kühlflüssigkeit eines kühlenden Kühlsystems des Retarders aufgeheizt. Wie schnell die Temperatur nach abschalten des Retarders wieder abfällt ist abhängig von der Leistungsfähigkeit des Kühlsystems. In einem Kühlsystem mit hoher Leistungsfähigkeit wird die Temperatur schnell abfallen und in einem Kühlsystem mit niedrigerer Leistungsfähigkeit wird die Temperatur langsamer abfallen. Daher wird ein erfindungsgemäßes Verfahren vorgeschlagen, bei dem durch Ermitteln des Temperaturgradienten des Kühlmittels unmittelbar nach einer Bremsung des Retarders die Leistungsfähigkeit des Kühlsystems bestimmt wird. Temperatursensoren zur Ermittlung der Temperatur des Kühlmittels sind standardgemäß in jedem Kühlsystem vorhanden. Damit ist das Verfahren sowohl einfach als auch kostengünstig, da keine zusätzlichen Vorrichtungen benötigt werden, um die Leistungsfähigkeit des Kühlsystems zu bestimmen. Wenn die Retardersteuerung die Leistungsfähigkeit des Kühlsystems selber ermitteln kann, können in der Steuerung mehrere Rückregelungsstrategien vorprogrammiert sein und die Steuerung wählt selber die zur Kühlleistung des Kühlsystems passende Rückregelungsstrategie aus.During braking with a retarder, the cooling liquid of a cooling cooling system of the retarder is heated up. How quickly the temperature drops after switching off the retarder depends on the efficiency of the cooling system. In a high performance cooling system, the temperature will drop quickly and in a lower performance cooling system, the temperature will drop more slowly. Therefore, an inventive method is proposed, in which by determining the temperature gradient of the coolant immediately after a braking of the retarder, the performance of the cooling system is determined. Temperature sensors for determining the temperature of the coolant are present in every cooling system as standard. Thus, the method is both simple and inexpensive, since no additional devices are needed to determine the performance of the cooling system. If the retarder control can determine the performance of the cooling system itself, several feedback control strategies can be preprogrammed in the control, and the control itself selects the feedback control strategy appropriate for the cooling performance of the cooling system.

Des Weiteren wird vorgeschlagen, dass der Temperaturgradient des Kühlmittels zusätzlich während einer Retarderbremsung ermittelt wird, wobei die Ermittlung des Temperaturgradienten vor einer Einschaltung einer Rückregelung durchgeführt wird. Somit können während einer Bremsung zwei Ergebnisse der Leistungsfähigkeit des Kühlsystems ermittelt werden und dadurch ein sicheres Ergebnis erreicht werden.Furthermore, it is proposed that the temperature gradient of the coolant is additionally determined during retarder braking, wherein the determination of the temperature gradient is performed before switching back on. Thus, two results of the performance of the cooling system can be determined during braking, thereby achieving a safe result.

Die Leistung des Kühlsystems wird in vordefinierte Stufen einklassifiziert, beispielsweise gutes, mittleres und schlechtes Kühlsystem.The performance of the cooling system is classified into predefined levels, such as good, medium and poor cooling systems.

Um ein sicheres Ergebnis des Verfahrens zu bekommen wird vorgeschlagen, dass die gemessenen Temperaturgradienten abgespeichert werden. Ein Durchschnittswert wird von mehreren nach einander folgenden ermittelten und abgespeicherten Temperaturgradienten berechnet.In order to obtain a reliable result of the method, it is proposed that the measured temperature gradients be stored. An average value is calculated from several consecutively determined and stored temperature gradients.

In einer weiteren vorteilhaften Variante des Verfahrens wird vorgeschlagen, dass der Motor und die Motorbremse zusätzlich durch schon vorhandene CAN-Signale überwacht und deren Einfluss auf den Temperaturgradient des Kühlmittels berücksichtigt wird.In a further advantageous variant of the method, it is proposed that the engine and the engine brake are additionally monitored by already existing CAN signals and their influence on the temperature gradient of the coolant is taken into account.

Eine genaue Ermittlung des Temperaturgradienten des Kühlmittels während eines Zugbetriebs des Motors oder eines Bremsbetriebs der Motorbremse wird nicht möglich sein, da dann zusätzliche Wärme vom Motor im Kühlsystem zugeführt wird. Daher wird des Weiteren vorgeschlagen, dass bei einem erkannten Zugbetrieb des Motors oder einem erkannten Bremsbetrieb der Motorbremse auf die Ermittlung des Temperaturgradienten des Kühlmittels verzichtet wird.Accurate determination of the temperature gradient of the coolant during a traction operation of the engine or a brake operation of the engine brake will not be possible since additional heat is then supplied by the engine in the cooling system. Therefore, it is further proposed that is omitted in a detected train operation of the engine or a detected braking operation of the engine brake on the determination of the temperature gradient of the coolant.

Da das erfindungsgemäße Verfahren die Leistungsfähigkeit des Kühlsystems bestimmt, ist es möglich unterschiedliche Varianten der Retardersteuerung einzusparen. Stattdessen wird die Retardersteuerung mit mehreren unterschiedlichen Rückregelungsstrategien vorgesehen, wobei die geeignete durch das Ergebnis des erfindungsgemäßen Verfahrens ausgewählt wird.Since the inventive method determines the performance of the cooling system, it is possible to save different variants of the retarder control. Instead, the retarder control is provided with several different feedback control strategies, the appropriate being selected by the result of the method according to the invention.

Weitere Varianten und vorteilhafte Weiterbildungen der Erfindung werden anhand der Zeichnung und der Ausführungsbeispiele beschrieben. Es zeigen:

  • Fig. 1 ein Temperatur-Zeit-Diagramm für ein Kühlsystem mit großer Kühlleistung und
  • Fig. 2 ein Temperatur-Zeit-Diagramm für ein Kühlsystem mit geringer Kühlleistung.
Further variants and advantageous developments of the invention will be described with reference to the drawing and the embodiments. Show it:
  • Fig. 1 a temperature-time diagram for a cooling system with high cooling capacity and
  • Fig. 2 a temperature-time diagram for a cooling system with low cooling capacity.

In Fig. 1 und 2 sind Diagramme aufgezeichnet, in welchen eine Temperatur T eines Kühlmittels eines Kühlsystems eines Fahrzeugs im Verhältnis zu der Zeit t gezeigt wird. Bis zum Zeitpunkt t_1 wird eine Retarderbremsung durchgeführt und das Kühlmittel des Kühlsystems weist eine Temperatur T_1 auf. Im Zeitpunkt t_1 wird der Retarder ausgeschaltet, wobei die Temperatur T auf T_2 abfällt. Der Temperaturgradient dT/dt zeigt wie schnell das Kühlsystem wieder abkühlt, wenn der Retarder keine Wärme mehr im Kühlsystem zuführt. Beim Abschalten des Retarders wird der Temperaturgradient dT/dt gemessen und abgespeichert. Wenn zumindest zwei Temperaturgradienten dT/dt abgespeichert sind, wird ein Durchschnittswert vom Temperaturgradient dT/dt berechnet. Der Durchschnittswert wird benutzt um die Leistungsfähigkeit des Kühlsystems zu bestimmen. Die Fig. 1 und 2 zeigen eine ideale Situation, bei welcher weder Motor noch Motorbremse ab Zeitpunkt t_1 eingeschaltet sind, sondern das Fahrzeug ausrollt.In Fig. 1 and 2 diagrams are recorded in which a temperature T of a coolant of a cooling system of a vehicle is shown in relation to the time t. Until the time t_1 retarder braking is performed and the coolant of the cooling system has a temperature T_1. At time t_1, the retarder is switched off, the temperature T falling to T_2. The temperature gradient dT / dt shows how quickly the cooling system cools down again when the retarder no longer supplies heat in the cooling system. When switching off the retarder, the temperature gradient dT / dt is measured and stored. If at least two temperature gradients dT / dt are stored, an average value of the temperature gradient dT / dt is calculated. The average value is used to determine the performance of the cooling system. The Fig. 1 and 2 show an ideal situation in which neither engine nor engine brake from time t_1 are turned on, but the vehicle rolls out.

In Fig. 1 ist der Temperaturgradient dT/dt größer als den in Fig. 2. Von einem großen Temperaturgradienten dT/dt wird geschlossen, dass das Kühlsystem eine höhere Leistungsfähigkeit besitzt. Dadurch dass die Steuerung des Retarders selber die Leistungsfähigkeit des Kühlsystems bestimmen kann, wird es ermöglicht auf unterschiedliche Varianten der Retardersteuerung für unterschiedliche Fahrzeug bzw. Kühlsystemstypen zu verzichten. Stattdessen kann die Steuerung mit mehreren alternativen Rückregelungsstrategien vorgesehen werden, welche abhängig von der ermittelten Leistungsfähigkeit des Kühlsystems ausgewählt wird.In Fig. 1 the temperature gradient dT / dt is greater than that in Fig. 2 , From a large temperature gradient dT / dt it is concluded that the cooling system has a higher capacity. The fact that the control of the retarder itself can determine the performance of the cooling system, it is possible to dispense with different variants of the retarder control for different vehicle or cooling system types. Instead, the controller may be provided with a plurality of alternative feedback control strategies selected depending on the determined performance of the refrigeration system.

Bezugszeichenreference numeral

TT
Temperaturtemperature
T_1T_1
Temperatur während einer RetarderbremsungTemperature during retarder braking
T_2T_2
Temperatur nach einer RetarderbremsungTemperature after retarder braking
tt
ZeitTime
t_1t_1
Zeitpunkt des Ausschaltens des RetardersTime of switching off the retarder
dT/dtdT / dt
Temperaturgradienttemperature gradient

Claims (5)

Verfahren zur Bestimmung einer Leistungsfähigkeit eines Kühlsystems eines Kraftfahrzeugs mit einem Retarder als Funktion einer Temperatur (T) eines Kühlmittels, dadurch gekennzeichnet, dass ein Temperaturgradient (dT/dt) des Kühlmittels ermittelt wird unmittelbar nach einer Bremsung des Retarders und/oder während das Kühlsystem vom Retarder aufgeheizt wird aber vor einer Einschaltung einer Rückregelung des Retarders, wobei die Leistungsfähigkeit des Kühlsystems abhängig von Größe des Temperaturgradienten dT/dt bestimmt wird.Method for determining a performance of a cooling system of a motor vehicle with a retarder as a function of a temperature (T) of a coolant, characterized in that a temperature gradient (dT / dt) of the coolant is determined immediately after a braking of the retarder and / or during the cooling system of Retarder is heated but before switching on a back-regulation of the retarder, wherein the performance of the cooling system is determined depending on the size of the temperature gradient dT / dt. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Leistungsfähigkeit des Kühlsystems in vordefinierte Stufen einklassifiziert wird.A method according to claim 1, characterized in that the performance of the cooling system is classified into predefined stages. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichne t, dass ein Durchschnittswert von mehreren nachfolgenden Temperaturgradienten (dT/dt) benutzt wird um die Leistungsfähigkeit des Kühlsystems zu ermitteln.A method according to claim 1 or 2, characterized in that an average value of a plurality of subsequent temperature gradients (dT / dt) is used to determine the performance of the cooling system. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet , dass ein Motor und eine Motorbremse zusätzlich durch schon vorhandene CAN-Signale überwacht werden und deren Einfluss auf die Temperatur (T) bzw. den Temperaturgradienten (dT/dt) des Kühlmittels berücksichtigt werden.A method according to claim 1 or 2, characterized in that a motor and an engine brake are additionally monitored by already existing CAN signals and their influence on the temperature (T) and the temperature gradient (dT / dt) of the coolant are taken into account. Verfahren nach Anspruch 1, 2 oder 3, dadurch gekennzeichn et, dass bei erkanntem Zugbetrieb des Motors oder erkanntem Bremsbetrieb der Motorbremse auf die Ermittlung des Temperaturgradienten (dT/dt) verzichtet wird.Method according to Claim 1, 2 or 3, characterized in that the determination of the temperature gradient (dT / dt) is dispensed with when the engine is detected as being in traction or when the brake is detected.
EP08164380A 2007-09-22 2008-09-16 Method for determining the output of a cooling system Withdrawn EP2039903A3 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200710045370 DE102007045370A1 (en) 2007-09-22 2007-09-22 Method for determining a performance of a cooling system

Publications (2)

Publication Number Publication Date
EP2039903A2 true EP2039903A2 (en) 2009-03-25
EP2039903A3 EP2039903A3 (en) 2013-01-23

Family

ID=40243924

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08164380A Withdrawn EP2039903A3 (en) 2007-09-22 2008-09-16 Method for determining the output of a cooling system

Country Status (3)

Country Link
EP (1) EP2039903A3 (en)
BR (1) BRPI0804065A2 (en)
DE (1) DE102007045370A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014063863A1 (en) * 2012-10-25 2014-05-01 Voith Patent Gmbh Method for limiting the maximum brake torque of a hydrodynamic retarder, as well as a hydrodynamic retarder for a motor vehicle
CN106232959A (en) * 2014-04-30 2016-12-14 卡明斯公司 Optimize electromotor and the integrated system and method for vehicles driveline retarder

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012220364A1 (en) 2012-11-08 2014-05-08 Zf Friedrichshafen Ag Method for controlling the braking power of a hydrodynamic retarder
DE102022214357B3 (en) 2022-12-23 2024-03-14 Volkswagen Aktiengesellschaft Method and device for detecting the operation of an engine-independent additional heater and for diagnosing a coolant temperature sensor of a motor vehicle

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004040327A1 (en) 2004-08-20 2006-03-09 Volkswagen Ag Vehicle`s cooling system performance monitoring device, has device measuring temperature difference, where cooling performance efficiency signal is displayed upon comparison with target differential input that is found based on difference

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2635640A1 (en) * 1975-08-11 1977-03-03 Wormald Int HEAT DETECTOR DEVICE
JPS5717810A (en) * 1980-07-07 1982-01-29 Nippon Denso Co Ltd Alarm method and device for vehicle
ES2201363T3 (en) * 1997-04-23 2004-03-16 VOITH TURBO GMBH & CO. KG PROCEDURE AND DEVICE FOR THE MAXIMUM USE OF THE BRAKING EFFECT OF A RETARDER.
SE526865C2 (en) * 2004-02-25 2005-11-15 Scania Cv Ab Monitoring of engine coolant temperature sensors
JP2005256641A (en) * 2004-03-09 2005-09-22 Toyota Motor Corp Cooling control device for internal combustion engine
GB2424474A (en) * 2005-03-21 2006-09-27 Bombardier Transp Gmbh Cooling system for an internal combustion engine, and a method of use in a vehicle

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004040327A1 (en) 2004-08-20 2006-03-09 Volkswagen Ag Vehicle`s cooling system performance monitoring device, has device measuring temperature difference, where cooling performance efficiency signal is displayed upon comparison with target differential input that is found based on difference

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014063863A1 (en) * 2012-10-25 2014-05-01 Voith Patent Gmbh Method for limiting the maximum brake torque of a hydrodynamic retarder, as well as a hydrodynamic retarder for a motor vehicle
CN104755785A (en) * 2012-10-25 2015-07-01 福伊特专利有限公司 Method for limiting the maximum brake torque of a hydrodynamic retarder, as well as a hydrodynamic retarder for a motor vehicle
CN106232959A (en) * 2014-04-30 2016-12-14 卡明斯公司 Optimize electromotor and the integrated system and method for vehicles driveline retarder
EP3137747A4 (en) * 2014-04-30 2017-12-13 Cummins, Inc. System and method for optimizing the integration of engines and vehicle driveline retarders
CN106232959B (en) * 2014-04-30 2020-12-22 康明斯公司 System and method for optimizing engine and vehicle driveline retarder integration
US11230969B2 (en) 2014-04-30 2022-01-25 Cummins Inc. System and method for optimizing the integration of engines and vehicle driveline retarders

Also Published As

Publication number Publication date
BRPI0804065A2 (en) 2010-06-15
EP2039903A3 (en) 2013-01-23
DE102007045370A1 (en) 2009-04-02

Similar Documents

Publication Publication Date Title
DE3543145C2 (en) Electric braking system for a vehicle
DE3418235A1 (en) METHOD AND SYSTEM FOR DERIVING WHEEL SPEED DATA FOR A MOTOR VEHICLE NON-SLIP CONTROL
DE102019214080A1 (en) Method for monitoring an oil flow generated by means of an oil pump in an oil cooling circuit of a thermal management system
EP0224689B1 (en) Device for monitoring the temperature of direct current shunt dynamos for rotary printing machines
EP2039903A2 (en) Method for determining the output of a cooling system
EP2908059B1 (en) Method for the diagnosis of a heating installation with at least one heat exchanger
EP3105078B1 (en) Cooling method for a vehicle component, cooling apparatus and vehicle
EP3278190B1 (en) Regulation method for an electrical enclosure cooling device
EP1129915B1 (en) Method for increasing the availability of a prime mover and control device
EP1380485B1 (en) Method for the limitation of the braking action of a retarder depending on the temperature
EP3363260A1 (en) High-voltage vehicle heater and method for using recuperation power in a vehicle
EP2115868B1 (en) Method for controlling the temperature of a generator and generator controller
WO2016059197A1 (en) Method for controlling or regulating a coolant circuit of a motor vehicle air conditioning system
DE102015209139B4 (en) Apparatus for controlling a solenoid valve and control method therefor
EP2652409B1 (en) Method for operating a heat pump device
EP2105341B1 (en) Power supply device for a vehicle
EP2011706A2 (en) Method for regulating a retarder of a motor vehicle
EP0703416A1 (en) Central heating installation
DE10227163B4 (en) Method for determining a criterion for changing an actual value from a plurality of successively obtained measured values and heating device with a control device designed to carry out the method
DE19959706B4 (en) Method and device for controlling the braking torque of a brake force regulator on at least one wheel of a motor vehicle
DE202014104435U1 (en) heating system
DE102020109009B3 (en) Method and device for monitoring the switching position of a directional control valve in a cooling system
WO2009092469A2 (en) Method for operating a control unit for heat-sensitive actuators
WO2007068616A1 (en) Method for the determination of an overload range of an electric brake
DE102008058694A1 (en) Method for controlling hydraulic sequence system for use in hydraulic system, involves converting electrical control signal into hydraulic pilot pressure by proportional valve, and hydraulic pilot pressure controls hydraulic sequence system

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA MK RS

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA MK RS

RIC1 Information provided on ipc code assigned before grant

Ipc: F01P 11/16 20060101AFI20121220BHEP

17P Request for examination filed

Effective date: 20130722

AKX Designation fees paid

Designated state(s): DE SE

17Q First examination report despatched

Effective date: 20131203

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20150310