EP0727570A1 - Dispositif de régulation de la température du système de refroidissement d'un moteur à combustion interne - Google Patents

Dispositif de régulation de la température du système de refroidissement d'un moteur à combustion interne Download PDF

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Publication number
EP0727570A1
EP0727570A1 EP95119912A EP95119912A EP0727570A1 EP 0727570 A1 EP0727570 A1 EP 0727570A1 EP 95119912 A EP95119912 A EP 95119912A EP 95119912 A EP95119912 A EP 95119912A EP 0727570 A1 EP0727570 A1 EP 0727570A1
Authority
EP
European Patent Office
Prior art keywords
defect
coolant temperature
coolant
signal
air conditioning
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.)
Granted
Application number
EP95119912A
Other languages
German (de)
English (en)
Other versions
EP0727570B1 (fr
Inventor
Joachim Froeschl
Wolfgang Schmidt
Franz Dietmar
Gerhart Huemer
Heinz Lemberger
Dieter Wittelsberger
Günter Ranzinger
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.)
Bayerische Motoren Werke AG
Original Assignee
Bayerische Motoren Werke 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 Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Publication of EP0727570A1 publication Critical patent/EP0727570A1/fr
Application granted granted Critical
Publication of EP0727570B1 publication Critical patent/EP0727570B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • F01P7/167—Controlling of coolant flow the coolant being liquid by thermostatic control by adjusting the pre-set temperature according to engine parameters, e.g. engine load, engine speed
    • 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
    • F01P2023/00—Signal processing; Details thereof
    • F01P2023/08—Microprocessor; Microcomputer
    • 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
    • F01P2031/00—Fail safe
    • 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
    • F01P2031/00—Fail safe
    • F01P2031/32—Deblocking of damaged thermostat
    • 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
    • F01P2070/00—Details
    • F01P2070/04—Details using electrical heating elements

Definitions

  • the invention relates to a coolant temperature control system for the cooling system of an internal combustion engine in motor vehicles with an electrically heatable thermostatic valve, the operation of which can be shifted towards the cooler operation by means of electrical current supply.
  • Such a coolant temperature control system is known for example from DE 43 24 178 A1.
  • a cooler and a thermostatic valve are provided, with which the temperature of the coolant can be regulated in a warm-up mode, a mixed mode and a cooler mode.
  • the thermostatic valve contains an expansion element that can be heated electrically to reduce the coolant temperature.
  • the expansion element is designed in such a way that the coolant temperature adjusts to an upper working limit temperature in warm-up operation and / or in mixed operation without heating the expansion element.
  • This upper working limit temperature is preferably equal to the most economical operating temperature of the internal combustion engine and is only slightly less than a maximum permissible operating temperature. This upper working limit temperature can be, for example, approximately 105 ° C.
  • this upper working limit temperature can be too high for other systems regulating the coolant flow.
  • overheating can usually be prevented in a possible coolant flow control.
  • the heat exchanger temperature in heating or air conditioning systems is controlled by the timed activation of valves in permissible ranges.
  • the coolant can flow freely into the heat exchanger. This can lead to malfunctions, damage and possibly total failure of the heating or air conditioning system, especially when the coolant temperature is around the upper working limit temperature.
  • means are provided for detecting a defect in a further system regulating the coolant flow in the motor vehicle. If this system detects a defect, the thermostatic valve is energized. When the thermostatic valve is energized, the operating mode of the thermostatic valve is shifted in the direction of the cooler operation, as a result of which the coolant temperature is reduced if a defect is present.
  • the energization of the thermostatic valve is carried out in such a way that the coolant temperature is below a predetermined coolant temperature threshold.
  • this protects against overheating of the systems in the event of a defect; B. a reduction in fuel consumption, not having to give up completely.
  • a compromise is thus achieved between the requirements for the internal combustion engine and the requirements for further systems through which the coolant flows with respect to the coolant temperature.
  • the detection of a defect is carried out by means of plausibility monitoring of output signals of the systems through which the coolant flows.
  • These output signals are preferably existing input signals of a control device which generally regulates the electrical energization of the thermostatic valve. This enables a further function of the coolant temperature control system without having to make design changes to the hardware. For example, a separate error signal line is saved.
  • An electronic engine control unit 1 which also performs other functions of an internal combustion engine in motor vehicles, not shown here, contains, inter alia, a function block 4.
  • the electronic engine control unit 1 has a plurality of input and output signals.
  • a possible output signal is, for example, the current switching signal S T.
  • Input signals of the electronic engine control unit 1 are the coolant temperature signal T Kist , an air conditioning readiness signal S AC and an air conditioning compressor activation signal S KO .
  • the air conditioning readiness signal S AC and the air conditioning compressor switch-on signal S KO are output signals of an air conditioning control unit 2 of an air conditioning system, which here is an example of a further system regulating the coolant flow.
  • the air conditioning control unit 2 emits, inter alia, a valve switching signal S V , with which a valve is actuated in a clocked manner, in particular by a pulse width modulated signal, in order to regulate the flow of the coolant for the internal combustion engine accordingly in order to achieve a desired heat exchanger temperature.
  • a valve switching signal S V with which a valve is actuated in a clocked manner, in particular by a pulse width modulated signal, in order to regulate the flow of the coolant for the internal combustion engine accordingly in order to achieve a desired heat exchanger temperature.
  • a bus system such as. B. exchange the known motor vehicle bus CAN.
  • the climate control device 2 controls a diagnostics-capable driver circuit 3 to emit the valve switching signal S V depending on different input signals, such as. B. from signals of the control unit of an air conditioning system.
  • the air conditioning control unit 2 detects via the diagnostics-capable driver circuit 3 when a proper valve switching signal S V cannot be output.
  • the valve switching signal S V can cause the valve to open continuously due to a defect. This would allow unhindered heating coolant to flow through the heat exchanger and endanger the functionality of the air conditioning system.
  • This is an example of the presence of a defect in a system regulating the coolant flow, which is initially recognized by the air conditioning control unit 2 and is subsequently communicated to the electronic engine control unit 1 or the function block 4, for example.
  • This error can be reported, for example, via the CAN bus or, if such a bus is not present, via the air conditioning standby and air conditioning compressor activation signals S AC and S KO , which are present anyway.
  • the air conditioning system ready signal S AC informs the electronic engine control unit 1 that the driver has requested that the air conditioning system be switched on.
  • the air conditioning compressor switch-on signal S KO the information is transmitted to the electronic engine control unit 1 that the air conditioning compressor is active and, for example, the idle speed must therefore be increased.
  • the predetermined coolant temperature threshold T Kdef can be defined , for example, as a coolant temperature setpoint T Ksoll instead of a setpoint during normal operation as a function of various operating parameters in the event of a defect.
  • a setpoint specification in the event of a defect can, like in normal operation, be carried out using characteristic diagrams which are stored in the control unit. Different errors can also be communicated and recognized, for example via the CAN bus.
  • the coolant temperature threshold T Kdef can thus also be set differently in accordance with the type of defect or also in accordance with the system which is currently transmitting a defect.
  • a coolant temperature control system is created which, on the one hand, can be implemented flexibly but, on the other hand, can be implemented in a cost-saving manner.
EP95119912A 1995-02-14 1995-12-16 Dispositif de régulation de la température du système de refroidissement d'un moteur à combustion interne Expired - Lifetime EP0727570B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19504893A DE19504893B4 (de) 1995-02-14 1995-02-14 Kühlmitteltemperatur-Regelsystem für die Kühlanlage eines Verbrennungsmotors
DE19504893 1995-02-14

Publications (2)

Publication Number Publication Date
EP0727570A1 true EP0727570A1 (fr) 1996-08-21
EP0727570B1 EP0727570B1 (fr) 1998-08-26

Family

ID=7753922

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95119912A Expired - Lifetime EP0727570B1 (fr) 1995-02-14 1995-12-16 Dispositif de régulation de la température du système de refroidissement d'un moteur à combustion interne

Country Status (4)

Country Link
US (1) US5692460A (fr)
EP (1) EP0727570B1 (fr)
DE (2) DE19504893B4 (fr)
ES (1) ES2122429T3 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19728814A1 (de) * 1997-07-05 1999-01-07 Behr Thermot Tronik Gmbh & Co Kühlanlage für einen Verbrennungsmotor eines Kraftfahrzeuges
JPH11117739A (ja) * 1997-10-09 1999-04-27 Toyota Motor Corp 内燃機関の冷却水循環装置
US6200021B1 (en) * 1997-11-10 2001-03-13 Toyoto Jidosha Kabushiki Kaisha Abnormality detector apparatus for a coolant apparatus for cooling an engine
JP2000234535A (ja) * 1999-02-12 2000-08-29 Yamaha Motor Co Ltd 船舶推進機用排気装置
DE69935923T2 (de) * 1999-08-05 2008-01-10 Nippon Thermostat Co. Ltd., Kiyose Kühlungsregler für eine brennkraftmaschine
US6612271B2 (en) * 2001-03-13 2003-09-02 Nippon Thermostat Co., Ltd. Cooling controller for internal-combustion engine
US6925376B2 (en) * 2003-04-01 2005-08-02 Cummins, Inc. System for diagnosing operation of a cooling system for an internal combustion engine
DE10336599B4 (de) * 2003-08-08 2016-08-04 Daimler Ag Verfahren zur Ansteuerung eines Thermostaten in einem Kühlkreislauf eines Verbrennungsmotors
DE102005048313B4 (de) * 2005-10-06 2013-10-10 Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr Verfahren zur Diagnose des Zustands eines Thermostaten
DE202014002635U1 (de) * 2014-03-26 2015-06-29 GM Global Technology Operations LLC (n. d. Gesetzen des Staates Delaware) Kühlsystem für ein Kraftfahrzeug
US11046448B2 (en) * 2016-12-20 2021-06-29 Textron Innovations Inc. Engine cooling systems for aircraft

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4324178A1 (de) 1993-07-19 1995-01-26 Bayerische Motoren Werke Ag Kühlanlage für einen Verbrennungsmotor eines Kraftfahrzeuges mit einem Thermostatventil, das ein elektrisch beheizbares Dehnstoffelement enthält
EP0644320A1 (fr) * 1993-09-22 1995-03-22 Bayerische Motoren Werke Aktiengesellschaft Dispositif de refroidissement pour moteur à combustion interne refroidi par liquide d'un véhicule automobile
EP0664383A1 (fr) * 1994-01-20 1995-07-26 Bayerische Motoren Werke Aktiengesellschaft Système de refroidissement pour un moteur à combustion interne

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57181918A (en) * 1981-04-30 1982-11-09 Fuji Heavy Ind Ltd Cooling controller for water-cooled engine
IT1179990B (it) * 1984-02-24 1987-09-23 Gilardini Spa Gruppo termostatico per il circuito di raffreddamento del motore di veicoli
US4672920A (en) * 1984-12-10 1987-06-16 Duprez Wayne R Pressure compensated temperature switch unit for protection of an internal combustion engine
DE8702534U1 (fr) * 1987-02-19 1988-06-23 Gustav Wahler Gmbh U. Co, 7300 Esslingen, De
DE4109498B4 (de) * 1991-03-22 2006-09-14 Robert Bosch Gmbh Vorrichtung und Verfahren zur Regelung der Temperatur einer Brennkraftmaschine
DE9115114U1 (fr) * 1991-12-05 1992-02-20 Gustav Wahler Gmbh U. Co, 7300 Esslingen, De
JPH05332139A (ja) * 1992-05-29 1993-12-14 Toyota Motor Corp 内燃機関の冷却装置
DE4448011B4 (de) * 1993-07-19 2011-09-15 Bayerische Motoren Werke Aktiengesellschaft Kühlanlage für einen Verbrennungsmotor eines Kraftfahrzeuges mit einem Thermostatventil, das ein elektrisch beheizbares Dehnstoffelement enthält

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4324178A1 (de) 1993-07-19 1995-01-26 Bayerische Motoren Werke Ag Kühlanlage für einen Verbrennungsmotor eines Kraftfahrzeuges mit einem Thermostatventil, das ein elektrisch beheizbares Dehnstoffelement enthält
EP0644320A1 (fr) * 1993-09-22 1995-03-22 Bayerische Motoren Werke Aktiengesellschaft Dispositif de refroidissement pour moteur à combustion interne refroidi par liquide d'un véhicule automobile
EP0664383A1 (fr) * 1994-01-20 1995-07-26 Bayerische Motoren Werke Aktiengesellschaft Système de refroidissement pour un moteur à combustion interne

Also Published As

Publication number Publication date
DE19504893A1 (de) 1996-08-22
DE19504893B4 (de) 2004-12-30
DE59503336D1 (de) 1998-10-01
ES2122429T3 (es) 1998-12-16
EP0727570B1 (fr) 1998-08-26
US5692460A (en) 1997-12-02

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