DE102011005280B4 - Method for implementing coasting operation in a motor vehicle with an automatic transmission - Google Patents
Method for implementing coasting operation in a motor vehicle with an automatic transmission Download PDFInfo
- Publication number
- DE102011005280B4 DE102011005280B4 DE102011005280.1A DE102011005280A DE102011005280B4 DE 102011005280 B4 DE102011005280 B4 DE 102011005280B4 DE 102011005280 A DE102011005280 A DE 102011005280A DE 102011005280 B4 DE102011005280 B4 DE 102011005280B4
- Authority
- DE
- Germany
- Prior art keywords
- speed
- combustion engine
- internal combustion
- motor vehicle
- automatic transmission
- 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.)
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Classifications
-
- 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
- F16H61/04—Smoothing ratio shift
- F16H61/0437—Smoothing ratio shift by using electrical signals
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
- B60Y2300/00—Purposes or special features of road vehicle drive control systems
- B60Y2300/18—Propelling the vehicle
- B60Y2300/18008—Propelling the vehicle related to particular drive situations
- B60Y2300/18066—Coasting
- B60Y2300/18083—Coasting without torque flow between driveshaft and engine, e.g. with clutch disengaged or transmission in neutral
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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
- F16H59/14—Inputs being a function of torque or torque demand
- F16H59/18—Inputs being a function of torque or torque demand dependent on the position of the accelerator pedal
- F16H2059/186—Coasting
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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
- F16H61/04—Smoothing ratio shift
- F16H2061/0496—Smoothing ratio shift for low engine torque, e.g. during coasting, sailing or engine braking
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Transmission Device (AREA)
Abstract
Verfahren zur Realisierung des Segelbetriebs bei einem Kraftfahrzeug mit einem Automatgetriebe, dadurch gekennzeichnet, dass die Drehmomentübertragungsfähigkeit eines im Fahrgang, aus dem in den Segelbetrieb eingestiegen wird, drehmomentführenden Schaltelementes über den Druck am Schaltelement derart geregelt wird, dass die Drehzahl des Verbrennungsmotors auf eine Solldrehzahl eingeregelt wird, die kleiner ist als die Motorleerlaufdrehzahl und eine Ölversorgung des Getriebes gerade noch sicherstellt.Method for implementing coasting mode in a motor vehicle with an automatic transmission, characterized in that the torque transmission capacity of a torque-carrying shifting element in driving gear, from which coasting mode is entered, is controlled via the pressure on the shifting element in such a way that the speed of the internal combustion engine is adjusted to a target speed is lower than the engine idling speed and just ensures that the transmission is supplied with oil.
Description
Die vorliegende Erfindung bezieht sich auf ein Verfahren zur Realisierung des Segelbetriebs bei einem Kraftfahrzeug mit einem Automatgetriebe gemäß dem Oberbegriff des Patentanspruchs 1.The present invention relates to a method for implementing coasting operation in a motor vehicle with an automatic transmission according to the preamble of patent claim 1.
Bei einem Fahrzeug mit einem Automatgetriebe wird im Schubbetrieb der Verbrennungsmotor unbefeuert geschleppt, wobei das Schleppmoment dazu führt, dass das Fahrzeug stärker verzögert wird, als beim Rollen bei vom Antriebsstrang entkoppeltem Verbrennungsmotor.In a vehicle with an automatic transmission, the internal combustion engine is towed unfired in overrun mode, with the drag torque causing the vehicle to be decelerated more than when rolling with the internal combustion engine decoupled from the drive train.
Um das Schubmoment des Verbrennungsmotors zu reduzieren, ist aus dem Stand bekannt, im Rahmen eines Segelbetriebs, bei dem das Fahrzeug ohne Zugkraftanforderung frei rollen kann, ein Schaltelement im Getriebe zu öffnen und den Verbrennungsmotor auf eine Zieldrehzahl zu führen, die in der Regel der Motorleerlaufdrehzahl entspricht, wobei bei Leerlaufdrehzahl des Verbrennungsmotors die Ölversorgung des Getriebes noch gewährleistet ist. In nachteiliger Weise muss der vom Antriebsstrang entkoppelte Verbrennungsmotor aktiv befeuert werden, um die Motorleerlaufdrehzahl zu halten.In order to reduce the overrun torque of the internal combustion engine, it is known from the prior art to open a shifting element in the transmission and bring the internal combustion engine to a target speed, which is usually the engine idle speed, during coasting operation, in which the vehicle can roll freely without a request for traction corresponds to the oil supply of the transmission is still guaranteed at idle speed of the combustion engine. Disadvantageously, the internal combustion engine, which is decoupled from the drive train, has to be actively fired in order to maintain the engine idle speed.
Aus der
Des Weiteren geht aus der
Der vorliegenden Erfindung liegt die Aufgabe zugrunde, ein Verfahren zur Realisierung des Segelbetriebs bei einem Kraftfahrzeug mit einem Automatgetriebe anzugeben. Durch das erfindungsgemäße Verfahren sollen das Schleppmoment des Verbrennungsmotors reduziert und die Ölversorgung des Getriebes sichergestellt werden.The present invention is based on the object of specifying a method for implementing coasting operation in a motor vehicle with an automatic transmission. The drag torque of the internal combustion engine is to be reduced and the oil supply to the transmission is to be ensured by the method according to the invention.
Demnach wird ein Verfahren zur Realisierung des Segelbetriebs bei einem Kraftfahrzeug mit einem Automatgetriebe vorgeschlagen, im Rahmen dessen die Drehmomentübertragungsfähigkeit eines im Fahrgang, aus dem in den Segelbetrieb eingestiegen wird, drehmomentführenden Schaltelementes über den Druck am Schaltelement derart geregelt wird, dass die Drehzahl des Verbrennungsmotors auf eine Solldrehzahl eingeregelt wird, die kleiner ist als die Motorleerlaufdrehzahl und eine Ölversorgung des Getriebes gerade noch sicherstellt.Accordingly, a method is proposed for implementing coasting mode in a motor vehicle with an automatic transmission, in the context of which the torque transmission capacity of a torque-carrying shifting element in driving gear, from which coasting mode is entered, is controlled via the pressure on the shifting element in such a way that the speed of the internal combustion engine increases a setpoint speed is adjusted that is lower than the engine idling speed and just ensures that the transmission is supplied with oil.
Hierbei wird die Drehzahl des Verbrennungsmotors über die sich ändernde Abtriebsdrehzahl konstant gehalten; zudem wird erfindungsgemäß die Drehzahl des Verbrennungsmotors während einer Gangnachführung über die Regelung des Drucks am Schaltelement ebenfalls konstant gehalten und entspricht der Solldrehzahl. Die Wandlerkupplung des Automatgetriebes ist geschlossen oder wird in einen Zustand mit geringem Schlupf überführt.The speed of the internal combustion engine is kept constant over the changing output speed; In addition, according to the invention, the speed of the internal combustion engine is also kept constant during gear tracking via the regulation of the pressure at the shifting element and corresponds to the setpoint speed. The converter clutch of the automatic transmission is closed or is being transferred to a state with low slip.
Gemäß einer Weiterbildung der Erfindung kann eine zusätzliche vom Verbrennungsmotor angetriebene Pumpe oder eine elektrische Zusatzpumpe verwendet werden, wodurch bei sichergestellter Ölversorgung des Getriebes die Drehzahl des Verbrennungsmotors noch weiter abgesenkt werden kann.According to a development of the invention, an additional pump driven by the internal combustion engine or an additional electric pump can be used, as a result of which the speed of the internal combustion engine can be reduced even further while the oil supply to the transmission is ensured.
Um zu gewährleisten, dass die Drehzahl des Verbrennungsmotors während des Segelbetriebs nicht unterhalb der Solldrehzahl fällt, wird im Rahmen einer weiteren Ausgestaltung der Erfindung vorgeschlagen, während des Segelbetriebs den Drehzahlregler des Verbrennungsmotors zu aktivieren. Hierbei greift der Drehzahlregler ein, wenn die Istdrehzahl des Verbrennungsmotors die Solldrehzahl unterschreitet, weil der Druck im Schaltelement nicht ausreicht, um den Verbrennungsmotor auf der Zieldrehzahl zu halten. Hierdurch wird sichergestellt, dass die Ölversorgung auf jeden Fall gewährleistet bleibt.In order to ensure that the speed of the internal combustion engine does not fall below the setpoint speed during coasting operation, another embodiment of the invention proposes activating the speed controller of the combustion engine during coasting operation. The speed controller intervenes when the actual speed of the internal combustion engine falls below the set speed because the pressure in the switching element is not sufficient to keep the internal combustion engine at the target speed. This ensures that the oil supply is always guaranteed.
Durch die erfindungsgemäße Konzeption wird der Vorteil erzielt, dass das Schleppmoment des Verbrennungsmotors reduziert wird, ohne die Ölversorgung des Getriebes negativ zu beeinflussen. Dadurch wird zum einen die Reichweite, die das Fahrzeug zurücklegen kann, erhöht; zum anderen entfällt die Notwendigkeit einer aktiven Befeuerung des Verbrennungsmotors, was in einer Kraftstoffersparnis resultiert.The inventive concept has the advantage that the drag torque of the internal combustion engine is reduced without negatively influencing the oil supply to the transmission. On the one hand, this increases the range that the vehicle can cover; on the other hand, there is no need for active firing of the internal combustion engine, which results in fuel savings.
Claims (4)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102011005280.1A DE102011005280B4 (en) | 2011-03-09 | 2011-03-09 | Method for implementing coasting operation in a motor vehicle with an automatic transmission |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102011005280.1A DE102011005280B4 (en) | 2011-03-09 | 2011-03-09 | Method for implementing coasting operation in a motor vehicle with an automatic transmission |
Publications (2)
Publication Number | Publication Date |
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DE102011005280A1 DE102011005280A1 (en) | 2012-09-13 |
DE102011005280B4 true DE102011005280B4 (en) | 2022-06-23 |
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Family Applications (1)
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DE102011005280.1A Active DE102011005280B4 (en) | 2011-03-09 | 2011-03-09 | Method for implementing coasting operation in a motor vehicle with an automatic transmission |
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Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10307462A1 (en) | 2003-02-21 | 2004-09-02 | Robert Bosch Gmbh | Method and device for controlling the drive unit of a vehicle |
DE102004017115A1 (en) | 2004-04-07 | 2005-10-27 | Zf Friedrichshafen Ag | Vehicle speed regulating method, involves accelerating vehicle again in optimized consumption over upper threshold value for speed in roll-out phase, when vehicle attains lower threshold value |
DE102008029453A1 (en) | 2008-06-21 | 2009-12-24 | Bayerische Motoren Werke Aktiengesellschaft | Method for setting a so-called "sailing mode" in a motor vehicle |
DE102009002521A1 (en) | 2009-04-21 | 2010-10-28 | Zf Friedrichshafen Ag | Method for operating a vehicle with a sailing or rolling mode |
EP2269882A2 (en) | 2009-06-30 | 2011-01-05 | Getrag Ford Transmissions GmbH | Method for operating a vehicle in coasting mode |
-
2011
- 2011-03-09 DE DE102011005280.1A patent/DE102011005280B4/en active Active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10307462A1 (en) | 2003-02-21 | 2004-09-02 | Robert Bosch Gmbh | Method and device for controlling the drive unit of a vehicle |
DE102004017115A1 (en) | 2004-04-07 | 2005-10-27 | Zf Friedrichshafen Ag | Vehicle speed regulating method, involves accelerating vehicle again in optimized consumption over upper threshold value for speed in roll-out phase, when vehicle attains lower threshold value |
DE102008029453A1 (en) | 2008-06-21 | 2009-12-24 | Bayerische Motoren Werke Aktiengesellschaft | Method for setting a so-called "sailing mode" in a motor vehicle |
DE102009002521A1 (en) | 2009-04-21 | 2010-10-28 | Zf Friedrichshafen Ag | Method for operating a vehicle with a sailing or rolling mode |
EP2269882A2 (en) | 2009-06-30 | 2011-01-05 | Getrag Ford Transmissions GmbH | Method for operating a vehicle in coasting mode |
Also Published As
Publication number | Publication date |
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DE102011005280A1 (en) | 2012-09-13 |
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Free format text: PREVIOUS MAIN CLASS: F16H0061120000 Ipc: F16H0061020000 |
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