EP4634551A1 - Motorbremsfunktion für ein stufenloses getriebe - Google Patents
Motorbremsfunktion für ein stufenloses getriebeInfo
- Publication number
- EP4634551A1 EP4634551A1 EP23810012.7A EP23810012A EP4634551A1 EP 4634551 A1 EP4634551 A1 EP 4634551A1 EP 23810012 A EP23810012 A EP 23810012A EP 4634551 A1 EP4634551 A1 EP 4634551A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- torque
- limit function
- transmission
- gear ratio
- drive train
- 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
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
- F16H61/66—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 continuously variable gearings
- F16H61/662—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 continuously variable gearings with endless flexible members
- F16H61/66272—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 continuously variable gearings with endless flexible members characterised by means for controlling the torque transmitting capability of the gearing
-
- 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
- F16H61/66—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 continuously variable gearings
-
- 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
- F16H61/66—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 continuously variable gearings
- F16H61/662—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 continuously variable gearings with endless flexible members
- F16H61/66254—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 continuously variable gearings with endless flexible members controlling of shifting being influenced by a signal derived from the engine and the main coupling
- F16H61/66259—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 continuously variable gearings with endless flexible members controlling of shifting being influenced by a signal derived from the engine and the main coupling using electrical or electronical sensing or control means
-
- 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
- F16H2059/147—Transmission input torque, e.g. measured or estimated engine torque
-
- 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
- F16H61/02—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 characterised by the signals used
- F16H61/0202—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 characterised by the signals used the signals being electric
- F16H61/0204—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 characterised by the signals used the signals being electric for gearshift control, e.g. control functions for performing shifting or generation of shift signal
- F16H61/0213—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 characterised by the signals used the signals being electric for gearshift control, e.g. control functions for performing shifting or generation of shift signal characterised by the method for generating shift signals
- F16H2061/0234—Adapting the ratios to special vehicle conditions
- F16H2061/0237—Selecting ratios for providing 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
- F16H61/66—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 continuously variable gearings
- F16H2061/6604—Special control features generally applicable to continuously variable gearings
- F16H2061/6611—Control to achieve a particular driver perception, e.g. for generating a shift shock sensation
- F16H2061/6612—Control to achieve a particular driver perception, e.g. for generating a shift shock sensation for engine braking
Definitions
- the invention relates to a method according to the preamble of claim 1 and a computer program according to the preamble of claim 6.
- Controls for automatic transmissions that implement engine braking are known from the state of the art. A corresponding control is disclosed, for example, in JP 6 11 46 645 A2. In order to achieve engine braking, the transmission is prevented from shifting up.
- the control is subject to a torque limitation. This is intended to protect the drive train from overload.
- the maximum engine torque and the torque load capacity of the downstream drive train are taken into account when limiting the torque.
- the invention is based on the object of improving the braking effect of a drive train with a continuously variable transmission. This object is achieved by a method according to claim 1 and a computer program according to claim 6. Preferred developments are contained in the subclaims.
- a continuously variable transmission also known as a CVT, is a transmission whose ratio between the input and output shafts can be continuously adjusted.
- CVT continuously variable transmission
- it can be a continuously variable power-split transmission that is used in a construction machine.
- the drive train includes all torque-conducting components that are in a torque flow from the engine to the driven wheels of the vehicle.
- the engine, one or more drive shafts and one or more axle differentials also belong to the drive train.
- the drive train can be operated in traction mode or in overrun mode. In traction mode, the engine generates a drive torque that provides propulsion. In overrun mode, the drive train is subjected to a torque flow in the opposite direction. This torque flow has a braking effect and thus counteracts the vehicle's propulsion.
- the gear ratio of the transmission is controlled so that a torque applied to a shaft of the drive train does not exceed a first limit function.
- the gear ratio is controlled so that the torque applied to the shaft does not exceed a limit torque that assigns the first limit function to the corresponding gear ratio of the transmission.
- the shaft can be any shaft of the drive train whose torque can be determined. It is preferably a shaft equipped with a torque sensor.
- the first limit function assigns a limit torque to the shaft to each gear ratio. This is present when the entire drive train is loaded with the maximum possible torque during traction. When the maximum possible torque load is applied to the drive train during traction, the limit torque mentioned is therefore present at the shaft.
- the gear ratio is controlled analogously using a second limit function.
- the gear ratio is controlled in detail so that the torque applied to the shaft does not exceed a limit torque, which the second limit function assigns to the corresponding gear ratio.
- the second limit function assigns a limit torque to each gear ratio of the transmission, which corresponds to a maximum possible torque load of a part of the drive train downstream of the engine in overrun mode.
- This limit torque is applied to the shaft at a maximum torque load of the said part of the drive train in overrun mode.
- the maximum braking effect that the part downstream of the engine can achieve is therefore utilized. of the drive train without damage. This makes it possible to exploit the maximum possible braking effect of the engine, taking into account the load capacity of the downstream part of the drive train.
- the downstream part of the driveline refers to a part of the driveline that lies between the engine and the driven wheels of the vehicle.
- This part of the driveline may include the transmission, one or more drive shafts and/or one or more axle differentials.
- the first limit function and the second limit function are different for at least one gear ratio of the transmission.
- the limit torque that the first limit function assigns to at least one gear ratio of the transmission differs from the limit torque that the second limit function assigns to the same gear ratio.
- the differences between the first limit function and the second limit function correspond to different load capacities of the drive train in traction and overrun mode.
- the development makes it possible to take these differences into account when regulating the gear ratio.
- the second limit function is greater than the first limit function for at least one gear ratio of the transmission.
- a limit torque that the second limit function assigns to at least one gear ratio of the transmission is greater than the limit torque that the first limit function assigns to the same gear ratio.
- the engine is adapted so that it can apply an increased braking torque.
- This can be achieved, for example, by means of a variable valve control.
- the movements of the pistons can then be made more difficult by closed valves. Accordingly, the development provides that a torque with which the engine can downstream part of the drive train is greater in magnitude for at least one speed in overrun mode than in traction mode.
- a brake of the vehicle is automatically activated in a further preferred development. This supports the engine braking according to the invention.
- a computer program according to the invention implements the method according to the invention or a preferred development.
- the computer program is therefore designed to carry out the method according to the invention or a preferred development of the method.
- the computer program includes instructions for carrying out the method according to the invention or a preferred development.
- the computer program causes a transmission control unit to carry out the method according to the invention or a preferred development when the computer program is executed by the transmission control unit.
- the computer program can be contained in the transmission control unit, stored on a storage medium or encoded in one or more transferable or transmitted signals.
- the computer program can be present as a computer program product, that is, as a tradable unit or a unit that serves the purpose of transferring ownership of the computer program.
- the computer program can be present not only as software, but also in the form of hardware-based circuit logic.
- FIG. 1 A preferred embodiment of the invention is shown in Fig. 1. In detail:
- Fig. 1 two limit functions.
- a first limit function 101 and a second limit function 103 are shown.
- the two limit functions 101, 103 assign a maximum output torque 107 to each gear ratio or reciprocal gear ratio 105 of a continuously variable transmission.
- the first limit function 101 corresponds to the maximum torque load capacity of the entire drive train in traction operation.
- the drive train also includes an engine. This limits the maximum load capacity of the drive train at higher reciprocal ratios 105.
- the second limit function 103 corresponds to the maximum torque load capacity of a part of the drive train downstream of the engine in overrun mode. A limitation by the engine is therefore not included in the second limit function 103. Therefore, the second limit function 103 allows larger torque loads for larger reciprocal ratios.
- A indicates an operating state in overrun mode.
- the output torque 107 present in state A exceeds the permissible limit torque according to the first limit function 101 for the corresponding reciprocal ratio 105. If the first limit function were used to control the ratio in overrun mode, the reciprocal ratio 105 would have to be increased accordingly. However, this would result in a reduced braking effect.
- the second limit function 103 is used instead. This allows a higher output torque 107 for the reciprocal ratio 105 of operating state A. This increases the braking torque that can be achieved.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Transmission Device (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102022213789.2A DE102022213789B3 (de) | 2022-12-16 | 2022-12-16 | Motorbremsfunktion für ein stufenloses Getriebe |
| PCT/EP2023/082317 WO2024125954A1 (de) | 2022-12-16 | 2023-11-20 | Motorbremsfunktion für ein stufenloses getriebe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4634551A1 true EP4634551A1 (de) | 2025-10-22 |
Family
ID=88921097
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP23810012.7A Pending EP4634551A1 (de) | 2022-12-16 | 2023-11-20 | Motorbremsfunktion für ein stufenloses getriebe |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP4634551A1 (de) |
| CN (1) | CN120225795A (de) |
| DE (1) | DE102022213789B3 (de) |
| WO (1) | WO2024125954A1 (de) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61146645A (ja) | 1984-12-18 | 1986-07-04 | Aisin Warner Ltd | 車両用動力伝達装置の制御装置 |
| DE4330391B4 (de) | 1993-03-31 | 2008-02-07 | Robert Bosch Gmbh | Verfahren zum Betrieb eines Fahrzeugs mit kontinuierlich verstellbarem Getriebe |
| DE4417335A1 (de) | 1993-06-01 | 1995-03-16 | Michael Meyerle | Stufenloses hydrostatisch-mechanisches Leistungsverzweigungsgetriebe |
| US6368247B1 (en) * | 1999-04-28 | 2002-04-09 | Mitsubishi Jidosha Kogyo Kabushiki | Speed ratio control system for continuously variable transmission |
| JP2004124965A (ja) * | 2002-09-30 | 2004-04-22 | Jatco Ltd | ベルト式無段変速機の制御装置 |
-
2022
- 2022-12-16 DE DE102022213789.2A patent/DE102022213789B3/de active Active
-
2023
- 2023-11-20 WO PCT/EP2023/082317 patent/WO2024125954A1/de not_active Ceased
- 2023-11-20 CN CN202380082762.8A patent/CN120225795A/zh active Pending
- 2023-11-20 EP EP23810012.7A patent/EP4634551A1/de active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| WO2024125954A1 (de) | 2024-06-20 |
| DE102022213789B3 (de) | 2024-02-29 |
| CN120225795A (zh) | 2025-06-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DE69214235T2 (de) | Rückschaltsteuerungsstrategie für ein stufenloses Getriebe zur Minimalisierung des Schlupfes an der Triebscheibe | |
| DE10040203A1 (de) | Unterdrehzahlsteuersystem für ein Hydromechanisches Antriebssystem und Verfahren zum Betrieb von diesem | |
| DE3439882A1 (de) | Steuerung fuer ein stufenlos veraenderliches fahrzeuggetriebe | |
| DE112012006767T5 (de) | Fahrzeuggetriebesteuerung | |
| DE102012200537A1 (de) | Verfahren zum Betreiben einers Fahrzeugantriebsstranges | |
| DE102012207364A1 (de) | System und Verfahren zur modellbasierten Neutral-Leerlauf-Kupplungssteuerung | |
| DE3144902A1 (de) | "antriebsaggregat mit einem schaltgetriebe" | |
| DE102013205358B4 (de) | Getriebesteuerkreis mit einem Druckbegrenzungsventil, Arbeitsmaschine mit einem Getriebesteuerkreis, sowie Verfahren zum Steuern desselben | |
| DE102017223274A1 (de) | Verfahren zum Betreiben eines Antriebsstrangs eines Kraftfahrzeugs | |
| DE102015207258A1 (de) | Hydrostatisches Getriebe, Fahrantrieb mit dem Getriebe und Verfahren zu Steuerung des Getriebes | |
| DE102014222948A1 (de) | Verfahren zum Ermitteln eines Soll-Wertes eines Betätigungsstroms | |
| DE102022214068B3 (de) | Verfahren und Steuergerät zum Betreiben eines Getriebes eines Kraftfahrzeugs | |
| DE10218186A1 (de) | Verfahren zur Steuerung eines Anfahrvorgangs mit einem Doppelkupplungsgetriebe | |
| DE102021208184B3 (de) | Verfahren zur Steuerung einer Reversierung bei einer Arbeitsmaschine sowie Steuereinrichtung und Arbeitsmaschine mit einer solchen Steuereinrichtung | |
| DE10247970A1 (de) | Verfahren zum Anfahren eines Kraftfahrzeuges | |
| DE1948953A1 (de) | Steuersystem fuer ein Getriebe,insbesondere fuer Kraftfahrzeuge | |
| EP4634551A1 (de) | Motorbremsfunktion für ein stufenloses getriebe | |
| DE102007039083A1 (de) | Verfahren zum Betreiben einer Hydraulikpumpe eines Antriebsstrangs sowie Antriebsstrang | |
| DE102009001799A1 (de) | Verfahren zum kontrollierten Langsamfahren im Zugbetrieb für ein Kraftfahrzeug mit einem Stufenautomatgetriebe | |
| EP2310717B1 (de) | Verfahren zum betrieb eines drehmomentübertragungssystems und drehmomentübertragungssystem | |
| DE19952352A1 (de) | Verfahren und Vorrichtung zum Steuern und Regeln einer Kupplung in einem automatisierten Stufengetriebe für ein Kraftfahrzeug | |
| DE102019200125A1 (de) | Verfahren zum Betreiben eines Antriebsstranges eines Fahrzeugs | |
| DE102019209401A1 (de) | Verfahren zur Anpassung eines auf einem Steuergerät hinterlegten Reibwerts eines Schaltelements | |
| DE102017204469B4 (de) | Verfahren und Steuerungseinrichtung zum Betreiben eines Getriebes | |
| DE102022214070B3 (de) | Verfahren und Steuergerät zum Betreiben eines Getriebes eines Kraftfahrzeugs |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: UNKNOWN |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE |
|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE |
|
| 17P | Request for examination filed |
Effective date: 20250520 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC ME MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
| GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: GRANT OF PATENT IS INTENDED |
|
| DAV | Request for validation of the european patent (deleted) | ||
| DAX | Request for extension of the european patent (deleted) | ||
| INTG | Intention to grant announced |
Effective date: 20260304 |