WO2005100758A1 - Device for cooling at least one piston of an internal combustion engine - Google Patents

Device for cooling at least one piston of an internal combustion engine Download PDF

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Publication number
WO2005100758A1
WO2005100758A1 PCT/EP2005/003783 EP2005003783W WO2005100758A1 WO 2005100758 A1 WO2005100758 A1 WO 2005100758A1 EP 2005003783 W EP2005003783 W EP 2005003783W WO 2005100758 A1 WO2005100758 A1 WO 2005100758A1
Authority
WO
WIPO (PCT)
Prior art keywords
lubricating oil
internal combustion
combustion engine
piston
cooling
Prior art date
Application number
PCT/EP2005/003783
Other languages
German (de)
French (fr)
Inventor
Ulrich Ernst
Uwe Brendel
Carsten Wolf
Original Assignee
Bayerische Motoren Werke
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 filed Critical Bayerische Motoren Werke
Priority to EP05730786A priority Critical patent/EP1743091A1/en
Publication of WO2005100758A1 publication Critical patent/WO2005100758A1/en
Priority to US11/546,415 priority patent/US20070022981A1/en

Links

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
    • F01P3/00—Liquid cooling
    • F01P3/06—Arrangements for cooling pistons
    • F01P3/08—Cooling of piston exterior only, e.g. by jets
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/08—Lubricating systems characterised by the provision therein of lubricant jetting means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/08—Lubricating systems characterised by the provision therein of lubricant jetting means
    • F01M2001/086—Lubricating systems characterised by the provision therein of lubricant jetting means for lubricating gudgeon pins
    • 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
    • F01P2003/006—Liquid cooling the liquid being oil
    • 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
    • F01P2025/40—Oil 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
    • F01P2025/60—Operating parameters
    • F01P2025/64—Number of revolutions
    • 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
    • F01P7/164—Controlling of coolant flow the coolant being liquid by thermostatic control by varying pump speed

Definitions

  • the invention relates to a device for cooling at least one piston of an internal combustion engine according to the preamble of claim 1.
  • the invention has for its object to provide a method which ensures an optimized piston cooling such that the Internal combustion engine is improved in terms of their overall efficiency.
  • a non-return valve in the main supply line or a non-return valve per supply line is used in a known manner, the lubricating oil pump for regulating the pressure within the lubricating oil circuit for adapting to different operating states of the internal combustion engine being load-dependent. Due to the load-dependent control of the lubricating oil pump, a non-return valve can be used which works with an increased opening pressure compared to a non-return valve of a system without a lubricating oil pump controlled according to the load. This avoids unnecessary piston cooling in many operating states.
  • the lubricating oil pump is controlled as a function of additional operating parameters - in particular as a function of the speed of the internal combustion engine and / or the temperature of the internal combustion engine and / or the coolant temperature of the internal combustion engine and / or the lubricating oil temperature.
  • Figure 1 a first device according to the invention.
  • Figure 1 shows a schematic representation of a device for cooling the pistons 2 (or the at least one piston) of an internal combustion engine.
  • the device comprises one Lubricating oil pump 10, which supplies the piston 2 with lubricating oil via a feed line 12 for cooling.
  • a check valve 14 is arranged in the feed line 12 between the lubricating oil pump 10 and the outlet opening 12a of the feed line 12.
  • the lubricating oil pump 10 is controlled by a control unit 20, which ensures that the lubricating oil pump 10 is regulated as a function of the determined load of the internal combustion engine.
  • the lubricating oil pump 10 is preferably controlled via the control unit 20 (for example an engine control unit) by means of a map control as a function of a plurality of operating parameters.
  • the control is carried out as a function of the engine temperature, the engine speed and / or the lubricating oil temperature. Due to the load-dependent regulation of the lubricating oil pump 10, the check valve 14 can be designed for an increased opening pressure.
  • a check valve 14 in the conventional, non-load-dependent control of the lubricating oil pump of an internal combustion engine in a motor vehicle is designed for an opening pressure of approximately two bar - in order to ensure sufficient piston cooling even in all critical conditions -
  • a check valve 14 with a higher opening pressure than this - for example an opening pressure of three bar - is used.
  • valves one valve per supply line
  • main supply line connected to the supply lines (not shown).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)

Abstract

The invention relates to a device for cooling the pistons of an internal combustion engine, by means of a lubricating oil pump supplying oil to each piston, at least on the bottom face thereof, from the lubricating oil circuit, by means of a supply line comprising an outlet opening, whereby oil supply is achieved through at least one valve. According to the invention, the at least one valve is a non-return valve, which permits a supply of oil only when a defined pressure in the lubricating oil circuit is achieved, provided with a controller, which guarantees that the lubricating oil pump is controlled such as to provided a variable pressure in the lubricating oil circuit, under differing operating conditions for the internal combustion engine depending on load.

Description

Vorrichtung zur Kühlung von zumindest einem Kolben einer BrennkraftmaschineDevice for cooling at least one piston of an internal combustion engine
Die Erfindung betrifft eine Vorrichtung zur Kühlung von zumindest einem Kolben einer Brennkraftmaschine gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a device for cooling at least one piston of an internal combustion engine according to the preamble of claim 1.
Eine derartige Vorrichtung nebst Verfahren ist bereits aus der DE 199 33 363 A1 bekannt. Hierbei wird die Schmierölzufuhr zur Kühlung der Kolben der Brennkraftmaschine über ein in Abhängigkeit der Motorparameter - Öltemperatur, Wassertemperatur oder Öldruck - gesteuertes Magnetventil geregelt. Auf diese Weise erfolgt eine Kühlung der Kolben beispielsweise erst nach einer durchlaufenen Kaltstartphase, so dass eine schnelle Brennraumerwärmung gewährleistet ist.Such a device and method are already known from DE 199 33 363 A1. The lubricating oil supply for cooling the pistons of the internal combustion engine is controlled via a solenoid valve that is controlled depending on the engine parameters - oil temperature, water temperature or oil pressure. In this way, the pistons are cooled, for example, only after a cold start phase has been completed, so that rapid combustion chamber heating is ensured.
Ferner ist aus der DE102 06 769 A1 ein Verfahren zum Betrieb einer Brennkraftmaschine mit Motorbremse und einer steuerbaren Kolbenkühlung bekannt, wobei im Motorbremsbetrieb die Kolbenkühlung reduziert wird. Hierdurch wird erreicht, dass der Kolben sich im Motorbremsbetrieb nicht übermäßig abkühlt. Das Auftreten eines vergrößerten Spiels zwischen Kolben und Zylinderwand und ein damit verbundenes vergrößertes Durchblasen von Luft aus dem Brennraum in den Kurbelraum (bfow-by) wird hierdurch vermieden.Furthermore, from DE102 06 769 A1 a method for operating an internal combustion engine with an engine brake and a controllable piston cooling system is known, the piston cooling being reduced in engine braking mode. This ensures that the piston does not cool down excessively during engine braking. This prevents the occurrence of increased play between the piston and cylinder wall and the associated increased blowing of air from the combustion chamber into the crank chamber (bfow-by).
Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren anzugeben, welches eine optimierte Kolbenkühlung gewährleistet derart, dass die Brennkraftmaschine im Hinblick auf ihren Gesamtwirkungsgrad verbessert wird.The invention has for its object to provide a method which ensures an optimized piston cooling such that the Internal combustion engine is improved in terms of their overall efficiency.
Erfindungsgemäß wird die Aufgabe durch die Gesamtheit der Merkmale des Anspruchs 1 gelöst. Gemäß der Erfindung findet in bekannter Art und Weise ein Rückschlagventil in der Hauptversorgungsleitung oder ein Rückschlagventil pro Zuführleitung Verwendung, wobei gemäß der Erfindung die Schmierölpumpe zur Regelung des Druckes innerhalb des Schmierölkreislaufs zur Anpassung an unterschiedliche Betriebszustände der Brennkraftmaschine lastabhängig erfolgt. Aufgrund der lastabhängigen Regelung der Schmierölpumpe kann ein Rückschlagventil Verwendung finden, welches mit einem - im Vergleich zu einem Rückschlagventil eines Systems ohne lastabhängig geregelte Schmierölpumpe - erhöhten Öffnungsdruck arbeitet. Hierdurch wird in vielen Betriebszuständen eine unnötige Kolbenkühlung vermieden.According to the invention, the object is achieved by the entirety of the features of claim 1. According to the invention, a non-return valve in the main supply line or a non-return valve per supply line is used in a known manner, the lubricating oil pump for regulating the pressure within the lubricating oil circuit for adapting to different operating states of the internal combustion engine being load-dependent. Due to the load-dependent control of the lubricating oil pump, a non-return valve can be used which works with an increased opening pressure compared to a non-return valve of a system without a lubricating oil pump controlled according to the load. This avoids unnecessary piston cooling in many operating states.
In einer Weiterbildung der Erfindung erfolgt die Regelung der Schmierölpumpe in Abhängigkeit zusätzlicher Betriebsparameter - insbesondere in zusätzlicher Abhängigkeit von der Drehzahl der Brennkraftmaschine und/oder der Temperatur der Brennkraftmaschine und/oder der Kühlmitteltemperatur der Brennkraftmaschine und/oder die Schmieröltemperatur.In a development of the invention, the lubricating oil pump is controlled as a function of additional operating parameters - in particular as a function of the speed of the internal combustion engine and / or the temperature of the internal combustion engine and / or the coolant temperature of the internal combustion engine and / or the lubricating oil temperature.
Im Folgenden wird die Erfindung anhand einer einzigen näher erläutert. Es zeigt:The invention is explained in more detail below with reference to a single one. It shows:
Figur 1 : eine erste Vorrichtung gemäß der Erfindung.Figure 1: a first device according to the invention.
Figur 1 zeigt in schematischer Darstellung eine Vorrichtung zur Kühlung der Kolben 2 (bzw. des mindestens einen Kolbens) einer Brennkraftmaschine. Dabei umfasst die Vorrichtung in der dargestellten Ausführungsform eine Schmierölpumpe 10, die über eine Zuführleitung 12 den Kolben 2 zwecks Kühlung mit Schmieröl versorgt. In der Zuführleitung 12 ist zwischen der Schmierölpumpe 10 und der Austrittsöffnung 12a der Zuführleitung 12 ein Rückschlagventil 14 angeordnet. Erfindungsgemäß wird die Schmierölpumpe 10 über eine Steuereinheit 20 angesteuert, die gewährleistet, dass die Schmierölpumpe 10 in Abhängigkeit von der ermittelten Last der Brennkraftmaschine geregelt wird. Bevorzugt wird die Schmierölpumpe 10 über die Steuereinheit 20 (beispielsweise ein Motorsteuergerät) mittels einer Kennfeldregelung in Abhängigkeit von einer Mehrzahl von Betriebsparametern angesteuert. Neben der Regelung bzw. Ansteuerung der Schmierölpumpe 10 in Abhängigkeit von der Last, erfolgt die Ansteuerung in Abhängigkeit von der Motortemperatur, der Motordrehzahl und/oder der Schmieröltemperatur. Aufgrund der lastabhängigen Regelung der Schmierölpumpe 10 kann das Rückschlagventil 14 für einen erhöhten Öffnungsdruck ausgelegt werden. Während ein Rückschlagventil 14 bei herkömmlicher, nicht-lastabhängiger Regelung der Schmierölpumpe einer Brennkraftmaschine bei einem Kraftfahrzeug für einen Öffnungsdruck von zirka zwei bar ausgelegt ist - um auch in allen kritischen Zuständen eine ausreichende Kolbenkühlung zu gewährleisten -, wird bei der erfindungsgemäßen lastabhängigen Regelung der Schmierölpumpe 10 ein Rückschlagventil 14 mit einem im Vergleich hierzu erhöhten Öffnungsdruck - beispielsweise einem Öffnungsdruck von drei bar - verwendet.Figure 1 shows a schematic representation of a device for cooling the pistons 2 (or the at least one piston) of an internal combustion engine. In the embodiment shown, the device comprises one Lubricating oil pump 10, which supplies the piston 2 with lubricating oil via a feed line 12 for cooling. A check valve 14 is arranged in the feed line 12 between the lubricating oil pump 10 and the outlet opening 12a of the feed line 12. According to the invention, the lubricating oil pump 10 is controlled by a control unit 20, which ensures that the lubricating oil pump 10 is regulated as a function of the determined load of the internal combustion engine. The lubricating oil pump 10 is preferably controlled via the control unit 20 (for example an engine control unit) by means of a map control as a function of a plurality of operating parameters. In addition to the regulation or control of the lubricating oil pump 10 as a function of the load, the control is carried out as a function of the engine temperature, the engine speed and / or the lubricating oil temperature. Due to the load-dependent regulation of the lubricating oil pump 10, the check valve 14 can be designed for an increased opening pressure. While a check valve 14 in the conventional, non-load-dependent control of the lubricating oil pump of an internal combustion engine in a motor vehicle is designed for an opening pressure of approximately two bar - in order to ensure sufficient piston cooling even in all critical conditions -, in the load-dependent control of the lubricating oil pump 10 according to the invention a check valve 14 with a higher opening pressure than this - for example an opening pressure of three bar - is used.
Selbstverständlich die Mehrzahl der Ventile (ein Ventil pro Zuführleitung) durch den Einsatz eines einzigen Ventils in einer mit den Zuführleitungen verbundenen Hauptversorgungsleitung ersetzt werden (nicht dargestellt). Of course, the majority of the valves (one valve per supply line) can be replaced by using a single valve in a main supply line connected to the supply lines (not shown).

Claims

Patentansprüche claims
1. Vorrichtung zur Kühlung von zumindest einem Kolben (2; 2') einer Brennkraftmaschine - mittels einer Schmierölpumpe (10; 10'), die Öl aus dem Schmierölkreislauf dem mindestens einen Kolben (2; 2') über eine, eine Austrittsöffnung (12a; 12a') aufweisende Zuführleitung (12; 12') zumindest bodenseitig zuführt, - wobei die Ölzufuhr über zumindest ein Ventil (14; 14') erfolgt, dadurch gekennzeichnet, dass - das zumindest eine Ventil (14) ein Rückschlagventil ist, welches eine Zuführung von Öl erst ab einem definierten Druck im Schmierölkreislauf zulässt und eine Steuereinheit (20) vorhanden ist, die gewährleistet, dass die Schmierölpumpe (10) zur Bereitstellung eines variablen Druckes im Schmierölkreislauf bei unterschiedlichen Betriebszuständen der Brennkraftmaschine lastabhängig geregelt wird.1. Device for cooling at least one piston (2; 2 ') of an internal combustion engine - by means of a lubricating oil pump (10; 10'), which supplies oil from the lubricating oil circuit to the at least one piston (2; 2 ') via an outlet opening (12a ; 12a ') having supply line (12; 12') at least at the bottom, - wherein the oil supply takes place via at least one valve (14; 14 '), characterized in that - the at least one valve (14) is a check valve, which is a The supply of oil is only permitted from a defined pressure in the lubricating oil circuit and a control unit (20) is present, which ensures that the lubricating oil pump (10) is regulated depending on the load in order to provide a variable pressure in the lubricating oil circuit in different operating states of the internal combustion engine.
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Steuereinheit (20; 20') derart ausgebildet ist, dass die Regelung der Schmierölpumpe (10) in Abhängigkeit von weiteren Betriebsparametem wie der Motordrehzahl und/oder der Motortemperatur und/oder der Kühlwassertemperatur und/oder der Schmieröltemperatur erfolgt. 2. Device according to claim 1, characterized in that the control unit (20; 20 ') is designed such that the control of the lubricating oil pump (10) in dependence on further operating parameters such as the engine speed and / or the engine temperature and / or the cooling water temperature and / or the lubricating oil temperature.
PCT/EP2005/003783 2004-04-13 2005-04-11 Device for cooling at least one piston of an internal combustion engine WO2005100758A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP05730786A EP1743091A1 (en) 2004-04-13 2005-04-11 Device for cooling at least one piston of an internal combustion engine
US11/546,415 US20070022981A1 (en) 2004-04-13 2006-10-12 Device for cooling at least one piston of an internal combustion engine

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004017909.3 2004-04-13
DE102004017909A DE102004017909A1 (en) 2004-04-13 2004-04-13 Device for cooling at least one piston of an internal combustion engine

Related Child Applications (1)

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US11/546,415 Continuation US20070022981A1 (en) 2004-04-13 2006-10-12 Device for cooling at least one piston of an internal combustion engine

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WO2005100758A1 true WO2005100758A1 (en) 2005-10-27

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US (1) US20070022981A1 (en)
EP (1) EP1743091A1 (en)
DE (1) DE102004017909A1 (en)
WO (1) WO2005100758A1 (en)

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