DE10247970A1 - Method for starting of motor vehicle with double clutch transmission entails operating first clutch in static friction domain and operating second clutch in dependence upon slip state of driving wheels - Google Patents
Method for starting of motor vehicle with double clutch transmission entails operating first clutch in static friction domain and operating second clutch in dependence upon slip state of driving wheels Download PDFInfo
- Publication number
- DE10247970A1 DE10247970A1 DE10247970A DE10247970A DE10247970A1 DE 10247970 A1 DE10247970 A1 DE 10247970A1 DE 10247970 A DE10247970 A DE 10247970A DE 10247970 A DE10247970 A DE 10247970A DE 10247970 A1 DE10247970 A1 DE 10247970A1
- Authority
- DE
- Germany
- Prior art keywords
- clutch
- slip
- drive
- torque
- starting
- 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.)
- Withdrawn
Links
- 238000000034 method Methods 0.000 title claims abstract description 30
- 230000005540 biological transmission Effects 0.000 title claims abstract description 15
- 230000003068 static effect Effects 0.000 title claims abstract description 7
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 108010074506 Transfer Factor Proteins 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000000881 depressing effect Effects 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K28/00—Safety devices for propulsion-unit control, specially adapted for, or arranged in, vehicles, e.g. preventing fuel supply or ignition in the event of potentially dangerous conditions
- B60K28/10—Safety devices for propulsion-unit control, specially adapted for, or arranged in, vehicles, e.g. preventing fuel supply or ignition in the event of potentially dangerous conditions responsive to conditions relating to the vehicle
- B60K28/16—Safety devices for propulsion-unit control, specially adapted for, or arranged in, vehicles, e.g. preventing fuel supply or ignition in the event of potentially dangerous conditions responsive to conditions relating to the vehicle responsive to, or preventing, spinning or skidding of wheels
- B60K28/165—Safety devices for propulsion-unit control, specially adapted for, or arranged in, vehicles, e.g. preventing fuel supply or ignition in the event of potentially dangerous conditions responsive to conditions relating to the vehicle responsive to, or preventing, spinning or skidding of wheels acting on elements of the vehicle drive train other than the propulsion unit and brakes, e.g. transmission, clutch, differential
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2510/00—Input parameters relating to a particular sub-units
- B60W2510/02—Clutches
- B60W2510/0241—Clutch slip, i.e. difference between input and output speeds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2520/00—Input parameters relating to overall vehicle dynamics
- B60W2520/26—Wheel slip
-
- 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
- F16H2312/00—Driving activities
- F16H2312/02—Driving off
-
- 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
- F16H61/0059—Braking of gear output shaft using simultaneous engagement of engaging means, e.g. clutches or brakes, applied for different gear ratios
-
- 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
- F16H61/68—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 specially adapted for stepped gearings
- F16H61/684—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 specially adapted for stepped gearings without interruption of drive
- F16H61/688—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 specially adapted for stepped gearings without interruption of drive with two inputs, e.g. selection of one of two torque-flow paths by clutches
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)
Abstract
Description
Die Erfindung bezieht sich auf eine
Verfahren zum Anfahren eines Kraftfahrzeuges mit einem Doppelkupplungsgetriebe
und einer zugehörigen
Doppelkupplung, bei welchem zum Anfahren zwei unterschiedliche Gänge verwendet
werden. Solche Verfahren zum Anfahren mit einem Doppelkupplungsgetriebe
sind bekannt (z. B.
Ebenfalls ist es bekannt, zum Anfahren
eines Kraftfahrzeuges mit einem Doppelkupplungsgetriebe die Kupplung
des ersten Ganges von einer Schlupfstellung aus zu schließen und
gleichzeitig die Kupplung des zweiten Ganges von einer Schlupfstellung aus
zu öffnen
(z. B.
Weiterhin ist auch bekannt, zum Anfahren den
Drehmomentenfluss über
zwei Reibungskupplungen aufrechtzuerhalten, bis spätestens
Drehzahlgleichheit zwischen Eingangsseite und Ausgangsseite an der
Reibungskupplung der niedrigeren Gangstufe vorherrscht (z. B.
Zum sportlichen Anfahren mit einem
Fahrzeug mit einem automatisierten Antriebsstrang ist es weiterhin
bekannt, die Kupplung mit eingelegtem Anfahrgang soweit zu schließen, dass
die Antriebsräder durchdrehen
und den auftretenden Schlupf der Antriebsräder mittels Schließen und Öffnen der
Kupplung zu steuern. Dieser sogenannte Rennstart ist z. B. aus der
Hiervon ausgehend ist es Aufgabe der Erfindung, ein sportliches Anfahren eines Kraftfahrzeuges mit einem Doppelkupplungsgetriebe darzustellen, bei welchem beide Kupplungen benutzt werden.Based on this, it is the task the invention, a sporty start of a motor vehicle with to represent a dual clutch transmission, in which both clutches to be used.
Zur Lösung dieser Aufgabe ist erfindungsgemäß vorgesehen, dass eine erste Kupplung im Haftreibungsbereich betrieben wird, und eine zweite Kupplung, abhängig vom Schlupfzustand der Antriebsräder, betrieben wird. Die zweite Kupplung wird hierbei im Schlupfzustand betrieben. Vorzugsweise ist der Gang, welcher der zweiten, schlupfenden Kupplung zugeordnet ist, größer als der Gang der ersten Kupplung. Nach einem wesentlichen Merkmal der Erfindung wird die zweite Kupplung dann im Gleitreibungsbereich betrieben, wenn die Schlupfdrehzahl der Antriebsräder einen vorgegebenen Grenzwert überschreitet.To achieve this object, the invention provides that a first clutch is operated in the static friction area, and a second clutch, depending the slip condition of the drive wheels, is operated. The second clutch is in the slip state operated. Preferably the gear is that of the second slipping clutch is assigned greater than the gear of the first clutch. According to an essential characteristic of The second clutch is then invented in the sliding friction range operated when the slip speed of the drive wheels one exceeds the predetermined limit.
Für ein sportliches und effektives Anfahren nach der erfindungsgemäßen Methode ist es erforderlich, dass die Schlupfdrehzahl der Antriebsräder in einem vorgegebenen Schlupfdrehzahlbereich gehalten wird, da durch übermäßiges Durchdrehen der Räder das Fahrzeug nicht mehr maximal beschleunigen kann. Erfindungsgemäß ist vorgesehen, dass bei Überschreiten des Grenzwertes der Schlupfdrehzahl diese dadurch verringert wird, dass das Antriebsmoment der Antriebsräder reduziert wird. Vorzugsweise wird das Antriebsmoment der Antriebsräder dadurch reduziert, dass eine zweite Kupplung, welche bis dahin kein Drehmoment auf die Antriebsräder übertragen hat, Drehmoment auf die Antriebsräder überträgt. Höchst vorzugsweise wird diese zweite Kupplung dazu im Gleitreibungsbereich betrieben. Nach einem wesentlichen Merkmal der Erfindung ist die Summe der Antriebsmomente, welche die beiden Kupplungen auf die Antriebsräder übertragen, kleiner als das Drehmoment, welches vorher von der ersten Kupplung allein auf die Antriebsräder übertragen wurde. Dem erfindungsgemäßen Verfahren liegt die Erkenntnis zugrunde, dass durch das Zuschalten der zweiten Kupplung, welcher ein höherer Gang als der ersten Kupplung zugeordnet ist, diese dadurch im gleichen Maße entlastet wird wie die zweite Kupplung belastet wird.For a sporty and effective start-up according to the method according to the invention, it is necessary that the slip speed of the drive wheels is kept in a predetermined slip speed range, since the vehicle can no longer accelerate as much as possible due to excessive wheel spin. It is provided according to the invention that if the limit value of the slip speed is exceeded, this is reduced by reducing the drive torque of the drive wheels. The drive torque of the drive wheels is preferably reduced in that a second clutch, which has not yet transmitted any torque to the drive wheels, transmits torque to the drive wheels. This second clutch is most preferably operated in the sliding friction range. According to an essential feature of the invention, the sum of the drive torques that the two clutches transmit to the drive wheels is smaller than the torque that the first clutch alone transmits to the drive wheels has been. The method according to the invention is based on the knowledge that by engaging the second clutch, which is assigned a higher gear than the first clutch, this is relieved to the same extent as the second clutch is loaded.
Dadurch wird das Drehmoment, welches auf die Antriebswelle wirkt, reduziert, da der Teil des Motordrehmoments welcher über den höheren Gang und die zweite Kupplung übertragen wird, aufgrund der höheren Übersetzung ein geringeres Drehmoment an der Abtriebswelle bedingt.This creates the torque which acts on the drive shaft, reduced because the part of the engine torque which about the higher Gear and the second clutch transferred will, due to the higher translation a lower torque on the output shaft.
Leistet der Fahrzeugmotor zum Beispiel 300Nm, wird über die Anfahrkupplung und den ersten Gang mit einer Übersetzung von z. B. Faktor 5 auf die Antriebswelle 1500 Nm übertragen.For example, if the vehicle engine is 300Nm, is about the starting clutch and first gear with a gear ratio from Z. B. Transfer factor 5 to the drive shaft 1500 Nm.
Wird die zweite Kupplung und eingelegter zweiter
Gang (Übersetzungsfaktor
Nach einem weiteren wesentlichen Merkmal der Erfindung wird das durch die zweite Kupplung übertragbare Moment dann wieder reduziert, wenn ein Grenzwert der Schlupfdrehzahl der Antriebsräder unterschritten wird. Besonders vorteilhaft hierbei ist, dass man damit die Schlupfdrehzahl der Antriebsräder in einem vorgegebenen Schlupfdrehzahlbereich einregeln kann. Vorzugsweise wird durch zumindest teilweises Öffnen der zweiten Kupplung der Schlupf der Antriebsräder wieder erhöht, da damit das Antriebsmoment der Antriebsräder erhöht wird. Das erfindungsgemäße Verfahren kann in ähnlicher Weise wie beim bekannten Rennstart, zum Anfahren des Fahrzeuges durch Betätigung des Fahrpedals ausgelöst werden. Vorzugsweise wird dazu das Fahrpedal stärker als ein Schwellenwert betätigt. Darüber hinaus kann das erfindungsgemäße Verfahren nicht nur zum Anfahren verwendet werden, sondern auch zum Einregeln eines Schlupfzustandes der Antriebsräder während der Fahrt. Vorzugsweise wird das erfindungsgemäße Verfahren jedoch zum Anfahren verwendet, wobei beim Betätigen des Fahrpedals in beschriebener Weise dies ein Hochdrehen der Antriebseinheit bewirkt. Daraufhin wird erfindungsgemäß die erste Kupplung innerhalb eines vorgebbaren Zeitintervalls soweit geschlossen, bis sie den Gleitreibungsbereich durchschritten hat und im Haftreibungsbereich arbeitet. Damit ist die thermische Belastung der ersten Kupplung, welche jetzt im Haftreibungsbereich ar beitet minimiert, da sie nicht mehr schlupft und dadurch keine Reibleistung mehr erzeugt.After another essential The feature of the invention is that which can be transmitted by the second clutch Torque then reduced again when a limit value of the slip speed of the drive wheels becomes. It is particularly advantageous here that the slip speed is adjusted the drive wheels can adjust in a predetermined slip speed range. Preferably is by at least partially opening the second clutch the slip of the drive wheels increased again because of that the drive torque of the drive wheels elevated becomes. The method according to the invention can in similar As with the well-known race start, for starting the vehicle by actuation of the accelerator pedal triggered become. For this purpose, the accelerator pedal is preferably stronger than a threshold value actuated. About that In addition, the method according to the invention not only used for starting, but also for adjusting a slip state of the drive wheels while driving. Preferably is the inventive method however used for starting, being described when pressing the accelerator pedal in Way this causes the drive unit to turn up. thereupon is the first according to the invention Coupling closed within a predefinable time interval as far as until it has passed through the sliding friction area and in the static friction area is working. This is the thermal load on the first clutch, which now works in the stiction area minimized, since it is not slips and therefore no longer generates friction.
Ein bevorzugtes Ausführungsbeispiel
ist in
Es zeigt:It shows:
In
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10247970A DE10247970A1 (en) | 2002-10-15 | 2002-10-15 | Method for starting of motor vehicle with double clutch transmission entails operating first clutch in static friction domain and operating second clutch in dependence upon slip state of driving wheels |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10247970A DE10247970A1 (en) | 2002-10-15 | 2002-10-15 | Method for starting of motor vehicle with double clutch transmission entails operating first clutch in static friction domain and operating second clutch in dependence upon slip state of driving wheels |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE10247970A1 true DE10247970A1 (en) | 2004-04-29 |
Family
ID=32049267
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE10247970A Withdrawn DE10247970A1 (en) | 2002-10-15 | 2002-10-15 | Method for starting of motor vehicle with double clutch transmission entails operating first clutch in static friction domain and operating second clutch in dependence upon slip state of driving wheels |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE10247970A1 (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1637424A3 (en) * | 2004-08-19 | 2006-04-05 | LuK Lamellen und Kupplungsbau Beteiligungs KG | Method and device for regulating the drive stability of a vehicle |
| DE102005029965A1 (en) * | 2005-06-28 | 2007-01-25 | Volkswagen Ag | Motor vehicle`s starting process realizing method, involves shifting increase in engine moment from region of thermal combustion to region of mechanical energy by adjusting firing angle during activation of starting process |
| DE102005051145A1 (en) * | 2005-10-26 | 2007-05-03 | Daimlerchrysler Ag | Drive chain operating method for motor vehicle, involves adjusting slippage by changing clutch torque, and finding slippage on relative valve, in which friction coefficient between wheels and road surface lies in region of maximum valve |
| EP2037158A1 (en) * | 2007-09-17 | 2009-03-18 | LuK Lamellen und Kupplungsbau Beteiligungs KG | Method for preventing drive wheels from spinning |
| WO2009047162A1 (en) * | 2007-10-08 | 2009-04-16 | Robert Bosch Gmbh | Method for generating braking torque in motor vehicles with a double clutch transmission |
| EP1536162A3 (en) * | 2003-11-27 | 2009-06-03 | Hitachi, Ltd. | Automobile and control apparatus, and power train system of automobile |
| EP2767733A4 (en) * | 2011-09-20 | 2016-07-13 | Aisin Ai Co Ltd | POWER TRANSMISSION CONTROL DEVICE FOR VEHICLE |
| WO2018046587A1 (en) * | 2016-09-09 | 2018-03-15 | Volkswagen Aktiengesellschaft | Method for carrying out launch control starting processes |
| DE102005035302B4 (en) | 2005-07-28 | 2019-02-28 | Bayerische Motoren Werke Aktiengesellschaft | Method for controlling a selectable by the driver starting a motor vehicle |
| CN110573760A (en) * | 2017-04-26 | 2019-12-13 | 奥迪股份公司 | Method for operating a clutch of a power train of a motor vehicle and motor vehicle with a power train |
| WO2021023344A1 (en) * | 2019-08-06 | 2021-02-11 | Schaeffler Technologies AG & Co. KG | Method for determining an output torque in a drive system capable of being power shifted in a vehicle |
| DE112008002301B4 (en) * | 2007-09-06 | 2024-11-07 | Getrag Getriebe- Und Zahnradfabrik Hermann Hagenmeyer Gmbh & Cie Kg | Method for controlling a dual-clutch transmission |
-
2002
- 2002-10-15 DE DE10247970A patent/DE10247970A1/en not_active Withdrawn
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1536162A3 (en) * | 2003-11-27 | 2009-06-03 | Hitachi, Ltd. | Automobile and control apparatus, and power train system of automobile |
| EP1637424A3 (en) * | 2004-08-19 | 2006-04-05 | LuK Lamellen und Kupplungsbau Beteiligungs KG | Method and device for regulating the drive stability of a vehicle |
| DE102005029965A1 (en) * | 2005-06-28 | 2007-01-25 | Volkswagen Ag | Motor vehicle`s starting process realizing method, involves shifting increase in engine moment from region of thermal combustion to region of mechanical energy by adjusting firing angle during activation of starting process |
| DE102005035302B4 (en) | 2005-07-28 | 2019-02-28 | Bayerische Motoren Werke Aktiengesellschaft | Method for controlling a selectable by the driver starting a motor vehicle |
| DE102005051145A1 (en) * | 2005-10-26 | 2007-05-03 | Daimlerchrysler Ag | Drive chain operating method for motor vehicle, involves adjusting slippage by changing clutch torque, and finding slippage on relative valve, in which friction coefficient between wheels and road surface lies in region of maximum valve |
| DE112008002301B4 (en) * | 2007-09-06 | 2024-11-07 | Getrag Getriebe- Und Zahnradfabrik Hermann Hagenmeyer Gmbh & Cie Kg | Method for controlling a dual-clutch transmission |
| EP2037158A1 (en) * | 2007-09-17 | 2009-03-18 | LuK Lamellen und Kupplungsbau Beteiligungs KG | Method for preventing drive wheels from spinning |
| US8150592B2 (en) | 2007-09-17 | 2012-04-03 | Schaeffler Technologies AG & Co. KG | Method for preventing drive wheels from spinning |
| WO2009047162A1 (en) * | 2007-10-08 | 2009-04-16 | Robert Bosch Gmbh | Method for generating braking torque in motor vehicles with a double clutch transmission |
| EP2767733A4 (en) * | 2011-09-20 | 2016-07-13 | Aisin Ai Co Ltd | POWER TRANSMISSION CONTROL DEVICE FOR VEHICLE |
| WO2018046587A1 (en) * | 2016-09-09 | 2018-03-15 | Volkswagen Aktiengesellschaft | Method for carrying out launch control starting processes |
| US11204069B2 (en) | 2016-09-09 | 2021-12-21 | Volkswagen Aktiengesellschaft | Method for carrying out launch control starting operations |
| CN109996972A (en) * | 2016-09-09 | 2019-07-09 | 大众汽车有限公司 | The method started for implementing ejection |
| CN110573760A (en) * | 2017-04-26 | 2019-12-13 | 奥迪股份公司 | Method for operating a clutch of a power train of a motor vehicle and motor vehicle with a power train |
| US11261924B2 (en) | 2017-04-26 | 2022-03-01 | Audi Ag | Method for operating a clutch of a drivetrain for a motor vehicle and motor vehicle having a drivetrain |
| WO2021023344A1 (en) * | 2019-08-06 | 2021-02-11 | Schaeffler Technologies AG & Co. KG | Method for determining an output torque in a drive system capable of being power shifted in a vehicle |
| US11703095B2 (en) | 2019-08-06 | 2023-07-18 | Schaeffler Technologies AG & Co. KG | Method for determining an output torque in a drive system capable of being power shifted in a vehicle |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 8110 | Request for examination paragraph 44 | ||
| R119 | Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee |
Effective date: 20120501 |