US20050224020A1 - Internal combustion engine with a coolant loop - Google Patents

Internal combustion engine with a coolant loop Download PDF

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Publication number
US20050224020A1
US20050224020A1 US11/124,412 US12441205A US2005224020A1 US 20050224020 A1 US20050224020 A1 US 20050224020A1 US 12441205 A US12441205 A US 12441205A US 2005224020 A1 US2005224020 A1 US 2005224020A1
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US
United States
Prior art keywords
temperature
internal combustion
combustion engine
temperature sensor
component
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.)
Abandoned
Application number
US11/124,412
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English (en)
Inventor
Jens Gregory
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.)
Daimler AG
Original Assignee
DaimlerChrysler 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 DaimlerChrysler AG filed Critical DaimlerChrysler AG
Assigned to DAIMLERCHRYSLER AG reassignment DAIMLERCHRYSLER AG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: VON GREGORY, JENS
Publication of US20050224020A1 publication Critical patent/US20050224020A1/en
Abandoned legal-status Critical Current

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    • 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
    • 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
    • F01P2025/31—Cylinder 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
    • F01P2025/33—Cylinder head 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
    • F01P2025/40—Oil temperature

Definitions

  • the invention relates to an internal combustion engine including a coolant loop for cooling a component or an operating medium of the engine, a thermostatic valve for controlling the flow of coolant in said cooling loop, and a temperature control device for controlling the temperature of the engine component or operating medium.
  • DE 23 47 038 A1 discloses an internal combustion engine including a cooling loop and a preferably wax-filled temperature sensor which may be disposed within the coolant loop and can be used to control the temperature of, for example, a cylinder head of the engine as a function of the coolant temperature.
  • the engine component such as the cylinder head
  • the engine component is usually cooled too much, especially during operation in the partial-load range.
  • it takes the engine much longer to reach its optimal operating temperature so that it cannot run optimally for a relatively long time.
  • overcooling of the cylinder head can cause internal stresses to be set up therein which may result in structural damage to the cylinder head.
  • Temperature control devices of this kind can also be used to control the temperature of operating mediums, such as motor oil, transmission fluid and fuel.
  • operating mediums such as motor oil, transmission fluid and fuel.
  • conventional control devices depend also on the temperature of the coolant and, therefore, tend to initiate cooling of the operating medium long before it has reached its maximum permissible temperature limit. Such an unnecessary overcooling of the operating medium will not allow an optimal temperature control of the operating medium to be achieved.
  • the above-mentioned problem arising due to the need of a control flow is present also in cooling the operating mediums of the engine.
  • DE 41 13 294 C1 discloses a temperature sensor for use in the cylinder head of an internal combustion engine which senses the temperature of a component of the cylinder head and sends its temperature reading to an engine control unit, which controls the operation of a thermostatic valve in the cooling circuit.
  • the invention has for its principal objective to solve these problems by providing an internal combustion engine with an improved and simple device for controlling the temperature of a component and/or operating medium of the engine in a more effective way.
  • a temperature control device which comprises a purely mechanical temperature sensor disposed in intimate heat transfer relationship with the component, and mechanical means extend between the temperature sensor and the thermostatic valve and define a path for transmitting temperature-related information from the former to the latter.
  • the invention accordingly resides in the provision of an internal combustion including a coolant loop for cooling a component or operating medium of the engine, a thermostatic valve for controlling the coolant flow in the coolant loop, and a temperature sensor for controlling the temperature of said engine component or operating medium.
  • the temperature control device comprises a purely mechanical temperature sensor disposed in intimate heat transfer relationship with the engine component or operating medium, and mechanical means connecting the temperature sensor to the thermostatic valve and forming a path for transmitting temperature-related information from the temperature sensor to the thermostatic valve.
  • the controlled quantity i.e. the degree to which the thermostatic valve opens
  • the regulating quantity i.e. the temperature of the engine component
  • cooling can be achieved depending on load and on the temperature of the engine component or operating medium, thus resulting in a much more direct temperature control than can be achieved with conventional controls.
  • Such direct temperature control makes it possible for the engine component or operating medium to be cooled more effectively than before under full-load conditions so that the engine requires less cooling under partial-load conditions. This leads, under partial-load conditions, to a temperature increase of the component or operating medium which, in turn, allows the engine to operate more efficiently.
  • the temperature control device embodying the invention also simplifies, or even renders redundant, the processes currently used to calculate the exact quantity of coolant to be supplied to engine components or operating mediums.
  • the temperature control device embodying the invention does not require a control flow since its temperature sensor takes the needed information directly from the engine component and requires no temperature information concerning the coolant. This eliminates the common heat-loss problem previously encountered, especially in cooling operating mediums, so that the internal combustion engine can warm up more quickly.
  • the invention attains its objective by providing an improved temperature control device utilizing a mechanical temperature sensor and mechanical means connecting it to a thermostatic valve.
  • the temperature control device according to the invention is particularly suitable for use in the cylinder head of an internal combustion engine or for controlling the temperature of a winding of the generator connected to the engine.
  • FIG. 1 is a diagrammatic view of an internal combustion engine embodying the invention
  • FIG. 2 is an enlarged view of one of various temperatures sensors shown in FIG. 1 .
  • the internal combustion engine schematically shown in FIG. 1 includes a crankcase 2 containing a predetermined quantity of motor oil 4 , a cylinder head 3 mounted on the crankcase 2 , a gear unit 5 adjoining the crankcase 2 and containing transmission oil, and a fuel tank 7 containing fuel 8 for powering the engine 1 .
  • the motor oil 4 and the transmission oil 6 could be combined in one volume.
  • the internal combustion engine 1 includes further a temperature control device 9 which in this case is used to control the temperature of a component of the engine, i.e. the cylinder head 3 , and to control the temperature of several operating mediums, i.e. the engine oil 4 , the transmission oil 6 , and the fuel 8 .
  • a temperature control device 9 which in this case is used to control the temperature of a component of the engine, i.e. the cylinder head 3 , and to control the temperature of several operating mediums, i.e. the engine oil 4 , the transmission oil 6 , and the fuel 8 .
  • it could also be used for controlling the temperature of, for example, only one engine component and/or one operating medium or of several engine components and one or more operating mediums.
  • the temperature control device 9 comprises four temperature sensors 10 , 11 , 12 and 13 disposed directly within the cylinder head 3 , the motor oil 4 , the transmission oil 6 and the fuel 8 , respectively.
  • these temperature sensors are purely mechanical and require no electrical power supply. One of them will be more fully described later herein with particular reference to FIG. 2 .
  • the temperature sensor 10 disposed within the cylinder head 3 communicates through a purely mechanical connecting line 14 with a thermostatic valve 15 in the cooling circuit 16 of the internal combustion engine 1 .
  • the thermostatic valve 10 controls the operation of a coolant pump 17 which serves to pump coolant also through the cylinder head 3 .
  • the cooling circuit 16 includes further a water cooler 18 , an exhaust return cooler 19 , a heater 20 , and an auxiliary heater. Reference to the four last-mentioned components 18 , 19 , 20 and 21 is made only for the sake of completeness.
  • the cooling circuit 16 includes a branch loop 22 including an oil cooler 23 for the motor oil 4 and for the transmission oil 6 , a heat exchanger 24 for the fuel 8 , and a water cooler 25 for supplying the heat exchanger 24 with coolant.
  • the two temperature sensors 11 and 12 communicate with a thermostatic valve 28 through mechanical connections 26 and 27 , respectively.
  • the temperature sensor 13 communicates with a thermostatic valve 30 via a mechanical connection 29 .
  • Both thermostatic valves 28 and 30 are part of a branch loop 22 .
  • temperature control device 9 of the illustrated embodiment utilizes four temperature sensors 10 , 11 , 12 and 13 and three thermostatic valves 15 , 28 , 30 , it should be understood that, depending on the intended use, it could have any number of such temperature sensors and thermostatic valves.
  • Each temperature sensor 10 , 11 , 12 or 13 transmits the temperature information obtained from the associated engine component directly to the associated thermostatic valve 15 , 28 or 30 through a path formed by the associated mechanical connection 14 , 26 , 27 or 29 .
  • the thermostatic valve will change its valve nozzle area in direct relation to the transmitted temperature information such that an increase of the temperature of the engine component will immediately result in an increased coolant flow through the valve.
  • a temperature increase detected by the temperature sensor 10 in the cylinder head 3 will immediately result in a stronger coolant flow through the cylinder head 3 ; and a temperature increase detected by the temperature sensor 11 or 12 will immediately result in an increased coolant flow through the oil cooler 23 or heat exchanger 24 , respectively.
  • a temperature increase of the engine component will result in an almost instant increase in the cooling thereof which allows the respective thermostatic valves 15 , 28 , 30 to open only at relatively high temperatures. This allows the cylinder head 3 to be kept at a higher temperature closer to the permissible limit and thereby creates more favorable operating conditions for the engine, and protects the operating mediums, i.e.
  • the motor oil, transmission oil and fuel 8 at low temperatures from being unnecessarily cooled since the temperature sensors 10 , 11 , 12 and 13 do not need any control flow and, therefore, will not initiate a response causing coolant to flow through the oil cooler 23 and the heat exchanger 24 .
  • the sensor comprises a tubular member 31 which is open on one side and disposed within the engine component, i.e. the cylinder head 3 , or in one of the operating mediums, i.e. the motor oil 4 , transmission fluid and/or the fuel 31 , Disposed within the tubular member is an expansion element 32 containing or consisting of an expansion material, such as wax, which will expand when its temperature rises above a predetermined degree. Based upon its operating characteristics, the tubular member 31 may be referred to as a capillary tube. As apparent from FIG.
  • expansion material is disposed also within the mechanical connection line 14 , 26 , 27 , 29 .
  • the expansion element 32 expands, the resultant pressure increase in the connection line 14 , 26 , 27 , 29 determines when and how wide the associated thermostatic valve 15 , 28 , 30 will open.
  • the temperature control device 9 can also be used to control the winding temperature of the generator utilized by and forming a component of the internal combustion engine 1 .

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Temperature-Responsive Valves (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
US11/124,412 2002-11-09 2005-05-06 Internal combustion engine with a coolant loop Abandoned US20050224020A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10252154A DE10252154A1 (de) 2002-11-09 2002-11-09 Vorrichtung zur Regelung der Temperatur eines Bauteils oder eines Betriebsmediums einer Brennkraftmaschine
DE10252154.9 2002-11-09
PCT/EP2003/011520 WO2004044398A1 (de) 2002-11-09 2003-10-17 Vorrichtung zur regelung der temperatur eines bauteils oder eines betriebsmediums einer brennkraftmaschine

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2003/011520 Continuation-In-Part WO2004044398A1 (de) 2002-11-09 2003-10-17 Vorrichtung zur regelung der temperatur eines bauteils oder eines betriebsmediums einer brennkraftmaschine

Publications (1)

Publication Number Publication Date
US20050224020A1 true US20050224020A1 (en) 2005-10-13

Family

ID=32308502

Family Applications (1)

Application Number Title Priority Date Filing Date
US11/124,412 Abandoned US20050224020A1 (en) 2002-11-09 2005-05-06 Internal combustion engine with a coolant loop

Country Status (4)

Country Link
US (1) US20050224020A1 (de)
EP (1) EP1558838A1 (de)
DE (1) DE10252154A1 (de)
WO (1) WO2004044398A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20180231926A1 (en) * 2015-08-10 2018-08-16 Canon Kabushiki Kaisha Image forming apparatus and unit control device

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2070092A (en) * 1929-04-11 1937-02-09 Gen Motors Corp Oil cooling system
US3300134A (en) * 1963-10-23 1967-01-24 Wahler Gustav Thermostatic control valve
US5445318A (en) * 1993-06-24 1995-08-29 Nicolas Pinilla Thermostatic safety valve for a hydraulic cooling circuit
US6450275B1 (en) * 2000-11-02 2002-09-17 Ford Motor Company Power electronics cooling for a hybrid electric vehicle
US6508212B2 (en) * 2000-04-17 2003-01-21 International Engine Intellectual Property Company, L.L.C. Cartridge thermostat system
US20060060346A1 (en) * 2004-08-30 2006-03-23 Toyota Jidosha Kabushiki Kaisha Heat exchanger structure of automatic transmission

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2347038A1 (de) * 1973-09-19 1975-03-27 Robionek Hans Joachim Thermostat fuer die kuehlung von verbrennungsmotoren
DE2809187A1 (de) * 1978-03-03 1979-09-13 Maschf Augsburg Nuernberg Ag Regeleinrichtung fuer den kuehlwasserkreislauf von brennkraftmaschinen
FR2579679B1 (fr) * 1985-03-27 1989-05-19 Minoux Jean Pierre Procede et dispositif de prechauffage du combustible liquide d'un moteur diesel

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2070092A (en) * 1929-04-11 1937-02-09 Gen Motors Corp Oil cooling system
US3300134A (en) * 1963-10-23 1967-01-24 Wahler Gustav Thermostatic control valve
US5445318A (en) * 1993-06-24 1995-08-29 Nicolas Pinilla Thermostatic safety valve for a hydraulic cooling circuit
US6508212B2 (en) * 2000-04-17 2003-01-21 International Engine Intellectual Property Company, L.L.C. Cartridge thermostat system
US6450275B1 (en) * 2000-11-02 2002-09-17 Ford Motor Company Power electronics cooling for a hybrid electric vehicle
US20060060346A1 (en) * 2004-08-30 2006-03-23 Toyota Jidosha Kabushiki Kaisha Heat exchanger structure of automatic transmission

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20180231926A1 (en) * 2015-08-10 2018-08-16 Canon Kabushiki Kaisha Image forming apparatus and unit control device

Also Published As

Publication number Publication date
DE10252154A1 (de) 2004-06-24
WO2004044398A1 (de) 2004-05-27
EP1558838A1 (de) 2005-08-03

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AS Assignment

Owner name: DAIMLERCHRYSLER AG, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:VON GREGORY, JENS;REEL/FRAME:016716/0383

Effective date: 20050517

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION