DE102021209871A1 - Procedure for determining the oil temperature of a wet clutch - Google Patents
Procedure for determining the oil temperature of a wet clutch Download PDFInfo
- Publication number
- DE102021209871A1 DE102021209871A1 DE102021209871.1A DE102021209871A DE102021209871A1 DE 102021209871 A1 DE102021209871 A1 DE 102021209871A1 DE 102021209871 A DE102021209871 A DE 102021209871A DE 102021209871 A1 DE102021209871 A1 DE 102021209871A1
- Authority
- DE
- Germany
- Prior art keywords
- pressure pump
- wet clutch
- current
- oil temperature
- pressure
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 14
- 230000005540 biological transmission Effects 0.000 claims abstract description 6
- 230000004913 activation Effects 0.000 claims abstract description 3
- 238000001816 cooling Methods 0.000 claims description 2
- 238000010200 validation analysis Methods 0.000 description 2
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
- F16H59/68—Inputs being a function of gearing status
- F16H59/72—Inputs being a function of gearing status dependent on oil characteristics, e.g. temperature, viscosity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D48/00—External control of clutches
- F16D48/02—Control by fluid pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/0021—Generation or control of line pressure
- F16H61/0025—Supply of control fluid; Pumps therefore
- F16H61/0031—Supply of control fluid; Pumps therefore using auxiliary pumps, e.g. pump driven by a different power source than the engine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2500/00—External control of clutches by electric or electronic means
- F16D2500/30—Signal inputs
- F16D2500/308—Signal inputs from the transmission
- F16D2500/30802—Transmission oil properties
- F16D2500/30803—Oil temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
- F16H59/68—Inputs being a function of gearing status
- F16H2059/683—Sensing pressure in control systems or in fluid controlled devices, e.g. by pressure sensors
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Control Of Transmission Device (AREA)
Abstract
Ein Verfahren zur Ermittlung der Öltemperatur einer Nasskupplung, wobei die Nasskupplung mittels einer elektrischen Druckpumpe aktuiert wird, wobei die Druckpumpe zum Einregeln eines Solldruckes auf eine aktuelle Drehzahl eingestellt wird, wobei die aktuelle Druckpumpenstromaufnahme beim Einstellen der aktuellen Drehzahl für den Solldruck ermittelt wird, wobei aus der aktuellen Druckpumpenstromaufnahme, der aktuellen Drehzahl und dem Solldruck aus einem abgespeicherten Kennfeld die Öltemperatur der Nasskupplung bestimmt wird und eine Getriebevorrichtung umfassend eine Nasskupplung, eine elektrische Druckpumpe zur Aktuierung der Nasskupplung und ein Steuergerät zur direkten oder indirekten Ansteuerung der Druckpumpe, wobei das Steuergerät dazu eingerichtet ist, ein solches Verfahren durchzuführen.A method for determining the oil temperature of a wet clutch, the wet clutch being actuated by means of an electric pressure pump, the pressure pump being set to a current speed in order to regulate a target pressure, the current pressure pump power consumption being determined when the current speed is set for the target pressure, with from the current pressure pump current consumption, the current speed and the target pressure from a stored characteristic map, the oil temperature of the wet clutch is determined and a transmission device comprising a wet clutch, an electric pressure pump for actuating the wet clutch and a control unit for direct or indirect activation of the pressure pump, the control unit being set up for this purpose is to carry out such a procedure.
Description
Gebiet der Erfindungfield of invention
Die vorliegende Erfindung betrifft ein Verfahren zur Ermittlung der Öltemperatur einer Nasskupplung, insbesondere in einem Kraftfahrzeug.The present invention relates to a method for determining the oil temperature of a wet clutch, in particular in a motor vehicle.
Stand der TechnikState of the art
Es ist bekannt, in Kraftfahrzeugen Nasskupplungen einzusetzen, insbesondere als Reibkupplungen, um beispielsweise eine Achse von einem Antrieb oder einer anderen Achse wahlweise zu trennen oder mit diesen zu koppeln.It is known to use wet clutches in motor vehicles, in particular as friction clutches, in order, for example, to selectively separate or couple an axle from a drive or another axle.
Nasskupplungen können bekannterweise ein Öl zur Betätigung der Kupplung verwenden, so dass mittels einer elektrischen Druckpumpe über das Öl die Kupplung aktuiert wird. Die Druckpumpe kann den Druck zum Schließen der Nasskupplung auf das Öl aufbringen.As is known, wet clutches can use oil to actuate the clutch, so that the clutch is actuated via the oil by means of an electric pressure pump. The pressure pump can apply the pressure to close the wet clutch to the oil.
Das Öl kann während dem Betrieb der Kupplung bzw. des Kraftfahrzeuges erhitzen und die genaue Kenntnis der Öltemperatur ist hilfreich zur exakten Aktuierung der Kupplung.The oil can heat up during operation of the clutch or the motor vehicle and precise knowledge of the oil temperature is helpful for precise actuation of the clutch.
In heutigen automatisierten Getrieben mit einer Naßkupplung werden üblicherweise Temperatursensoren eingesetzt, für Temperaturberechnungen der Kupplung und auch der Reibwerte. Die hierfür benötigte Hardware, wie Sensoren, Gehäusebearbeitung, Kabelbaum, Schnittstellen und Klips, verursachen hohe Kosten für das Produkt.In today's automated transmissions with a wet clutch, temperature sensors are usually used to calculate the temperature of the clutch and also the coefficients of friction. The hardware required for this, such as sensors, housing processing, cable harness, interfaces and clips, causes high costs for the product.
Zusammenfassung der ErfindungSummary of the Invention
Es ist eine Aufgabe der Erfindung, ein Verfahren zur Ermittlung der Öltemperatur einer Nasskupplung anzugeben, dass ohne Temperatursensoren auskommt und daher geringere Kosten verursacht.It is an object of the invention to specify a method for determining the oil temperature of a wet clutch that does not require temperature sensors and therefore causes lower costs.
Die Lösung der Aufgabe erfolgt durch ein Verfahren zur Ermittlung der Öltemperatur einer Nasskupplung, wobei die Nasskupplung mittels einer elektrischen Druckpumpe aktuiert wird, wobei die Druckpumpe zum Einregeln eines Solldruckes auf eine aktuelle Drehzahl eingestellt wird, wobei die aktuelle Druckpumpenstromaufnahme beim Einstellen der aktuellen Drehzahl für den Solldruck ermittelt wird, wobei aus der aktuellen Druckpumpenstromaufnahme, der aktuellen Drehzahl und dem Solldruck aus einem abgespeicherten Kennfeld die Öltemperatur der Nasskupplung bestimmt wird.The task is solved by a method for determining the oil temperature of a wet clutch, the wet clutch being actuated by means of an electric pressure pump, the pressure pump being set to a current speed in order to adjust a setpoint pressure, the current pressure pump current consumption when setting the current speed for the Target pressure is determined, the oil temperature of the wet clutch being determined from the current pressure pump power consumption, the current speed and the target pressure from a stored map.
Erfindungsgemäß erfolgt eine indirekte Messung der Temperatur des Öls durch Ermittlung der Stromaufnahmen der Druckpumpen. Zum Einregeln eines Solldrucks - Drucksensoren sind üblicherweise ohnehin vorhanden - muss die Pumpe in Abhängigkeit der Temperatur eine Drehzahl einstellen. Zudem ändert sich je nach Temperatur des Öls und damit verbunden der Viskosität, die Druckpumenstromaufnahme. Durch ein Kennfeld von Druck, Drehzahl und Stromaufnahmen kann mit hinreichender Genauigkeit auf eine Öltemperatur geschlossen werden.According to the invention, the temperature of the oil is measured indirectly by determining the power consumption of the pressure pumps. In order to regulate a target pressure - pressure sensors are usually present anyway - the pump must set a speed depending on the temperature. In addition, depending on the temperature of the oil and the associated viscosity, the power consumption of the pressure pump changes. An oil temperature can be deduced with sufficient accuracy from a map of pressure, speed and current consumption.
Es erfolgt somit eine indirekte Öltemperaturbestimmung durch Abgleich von Ist-Druck, Drehzahl und Stromaufnahme der Druckpumpe.There is thus an indirect determination of the oil temperature by comparing the actual pressure, speed and power consumption of the pressure pump.
Das Kennfeld umfasst zumindest die Dimensionen Druckpumpenstromaufnahme, Drehzahl, Solldruck und Öltemperatur, bevorzugt genau diese vier Dimensionen.The map includes at least the dimensions pressure pump power consumption, speed, target pressure and oil temperature, preferably precisely these four dimensions.
Das Verfahren wird bevorzugt von einem Steuergerät der Druckpumpe durchgeführt, das also direkt oder indirekt die Druckpumpe ansteuert.The method is preferably carried out by a control unit of the pressure pump, which therefore controls the pressure pump directly or indirectly.
Zur weiteren Validation kann ein Ölsumpftemperaturmodell eingesetzt werden, das die Verlustenergien in das Öl berechnet und die Kühlung des Getriebes berücksichtigt. Das Ergebnis einer solchen Validation über ein Ölsumpftemperaturmodell kann beispielsweise genutzt werden um die über die Druckpumenstromaufnahme ermittelte Öltemperatur zu korrigieren oder durch das Ergebnis des Ölsumpftemperaturmodells zu ersetzen.For further validation, an oil sump temperature model can be used, which calculates the energy loss in the oil and takes into account the cooling of the transmission. The result of such a validation using an oil sump temperature model can be used, for example, to correct the oil temperature determined using the pressure pump power consumption or to replace it with the result of the oil sump temperature model.
Eine erfindungsgemäße Getriebevorrichtung umfasst somit eine Nasskupplung, eine elektrische Druckpumpe zur Aktuierung der Nasskupplung und ein Steuergerät zur direkten oder indirekten Ansteuerung der Druckpumpe, wobei das Steuergerät dazu eingerichtet ist, ein Verfahren wie zuvor beschrieben durchzuführen.A transmission device according to the invention thus includes a wet clutch, an electric pressure pump for actuating the wet clutch and a control unit for direct or indirect activation of the pressure pump, the control unit being set up to carry out a method as described above.
Claims (5)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102021209871.1A DE102021209871A1 (en) | 2021-09-07 | 2021-09-07 | Procedure for determining the oil temperature of a wet clutch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102021209871.1A DE102021209871A1 (en) | 2021-09-07 | 2021-09-07 | Procedure for determining the oil temperature of a wet clutch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE102021209871A1 true DE102021209871A1 (en) | 2023-03-09 |
Family
ID=85226437
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE102021209871.1A Pending DE102021209871A1 (en) | 2021-09-07 | 2021-09-07 | Procedure for determining the oil temperature of a wet clutch |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE102021209871A1 (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008026553A1 (en) | 2008-06-03 | 2009-12-10 | Magna Powertrain Ag & Co Kg | Method for mathematically determining the oil temperature in a coupling unit |
| DE102012016591A1 (en) | 2012-08-16 | 2014-02-20 | Getrag Getriebe- Und Zahnradfabrik Hermann Hagenmeyer Gmbh & Cie Kg | Temperature determination method in a hydraulic system |
| DE102015225649A1 (en) | 2015-12-17 | 2017-07-06 | Volkswagen Aktiengesellschaft | Method for controlling and / or regulating a hydraulic system of a transmission |
| DE102016113282A1 (en) | 2016-07-19 | 2018-01-25 | GETRAG B.V. & Co. KG | Temperature determination method in a hydraulic system |
| WO2018130293A1 (en) | 2017-01-13 | 2018-07-19 | Gkn Automotive Ltd. | Method for adjusting the system pressure for a clutch |
-
2021
- 2021-09-07 DE DE102021209871.1A patent/DE102021209871A1/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008026553A1 (en) | 2008-06-03 | 2009-12-10 | Magna Powertrain Ag & Co Kg | Method for mathematically determining the oil temperature in a coupling unit |
| DE102012016591A1 (en) | 2012-08-16 | 2014-02-20 | Getrag Getriebe- Und Zahnradfabrik Hermann Hagenmeyer Gmbh & Cie Kg | Temperature determination method in a hydraulic system |
| DE102015225649A1 (en) | 2015-12-17 | 2017-07-06 | Volkswagen Aktiengesellschaft | Method for controlling and / or regulating a hydraulic system of a transmission |
| DE102016113282A1 (en) | 2016-07-19 | 2018-01-25 | GETRAG B.V. & Co. KG | Temperature determination method in a hydraulic system |
| WO2018130293A1 (en) | 2017-01-13 | 2018-07-19 | Gkn Automotive Ltd. | Method for adjusting the system pressure for a clutch |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R012 | Request for examination validly filed | ||
| R016 | Response to examination communication |