EP4448987A1 - Steuerung eines getriebes - Google Patents
Steuerung eines getriebesInfo
- Publication number
- EP4448987A1 EP4448987A1 EP22823559.4A EP22823559A EP4448987A1 EP 4448987 A1 EP4448987 A1 EP 4448987A1 EP 22823559 A EP22823559 A EP 22823559A EP 4448987 A1 EP4448987 A1 EP 4448987A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- gear
- requested
- change
- waiting time
- time
- 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
- F16H61/16—Inhibiting or initiating shift during unfavourable conditions , e.g. preventing forward-reverse shift at high vehicle speed, preventing engine overspeed
-
- 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
-
- 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
- F16H2061/0481—Smoothing ratio shift during range shift from drive (D) or reverse (R) to neutral (N)
-
- 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
- F16H61/08—Timing control
Definitions
- the present invention relates to the control of a transmission.
- the invention relates to the determination of a gear on the transmission depending on a position of a selector lever.
- a motor vehicle includes a drive train with a manual transmission.
- different driving stages and gears can be engaged, each of which implements a reduction in the drive train.
- the transmission can be controlled automatically, with a driver of the motor vehicle specifying a gear and a gear that is appropriate for a driving situation can be determined and engaged.
- Common gears include D for forward, R for reverse, P for park when the driveline is open and the output side is locked, and N for neutral when the driveline is disconnected.
- a traditional, mechanical selector lever is increasingly being replaced by an electronic selector lever, which electrically encodes a driver's request and forwards it to a control device, which then activates a suitable gear.
- buttons or switches can also be used to select the speed level. Such controls can be small and operated quickly.
- a driver can request changing gears faster than the transmission can be controlled to engage the gear. If a partially engaged gear is corrected, torque transmission in the transmission can be changed abruptly. This can be perceived as unpleasant and places a heavy load on parts of the transmission.
- a method for controlling an applicable gear of a transmission for a motor vehicle as a function of a requested gear includes steps of detecting a change in the requested gear from a first to a second gear; waiting until a predetermined waiting time has elapsed if none of the past A speed steps has been requested for longer than a predetermined holding time; and changing the current gear to the second gear.
- the driving stage can only be changed after the predetermined waiting time has elapsed.
- A is a positive integer and is preferably at least two.
- the method can be used to improve control of a transmission for a motor vehicle.
- a driver can spontaneously change the gear on a transmission controlled by the method, also several times in quick succession. If he does this more often than predetermined in succession, his requirements can initially be accepted with a delay. If the driver changes the requirements faster than the waiting time, they will no longer be accepted. In this way, improved dynamics can be achieved when controlling the transmission without having to accept the disadvantages of driving stages being changed too quickly one after the other.
- the transmission can be loaded less and torque engagement through the transmission can have reduced peaks.
- the waiting time after waiting can be increased.
- the increase can be by a predetermined amount, where the amount can be dependent on the last valid waiting time, so that a non-linear increase in the waiting time can be controlled.
- the maximum waiting time is preferably limited to a predetermined value, which is more preferably greater than the time that the transmission needs to disengage the previous gear and to fully engage the next gear. If a change request arrives during the waiting time, the previous request can be discarded and the waiting time can start again. At the end With a rapid succession of position requests, the last position request can accordingly be implemented after the waiting time has elapsed.
- the waiting time and/or the holding time can be set depending on a number of consecutive rapid changes in demand.
- the time in question may be lengthened as the number of consecutive rapid changes in demand increases. In other words, a delay effect when accepting a requested speed step can be all the greater, the more changes that follow one another in rapid succession are requested.
- the waiting time and/or the holding time can each be determined as a function of the second gear.
- a transition to a first predetermined speed step can thus take place more quickly than to a second predetermined speed step.
- the waiting time and/or the holding time can also depend on the first driving step.
- a specific transition from a first to a second predetermined driving stage can be decisive for determining the waiting time.
- a change can be defined by a transition from a predetermined first to a predetermined second gear.
- an external influence for determining the waiting time and/or the holding time can also be taken into account.
- the waiting time and/or holding time can be selected to be shorter when the accelerator pedal is actuated than when the accelerator pedal is not actuated.
- Actuation of the accelerator pedal can correspond to a driver-controlled request for torque on a drive motor connected to the transmission.
- a more complex process can also be determined and taken into account. For example, it can be determined that the vehicle is to be rocked free, for which there can be a sequence of rapid changes between forward and reverse travel while simultaneously actuating an accelerator pedal to control a drive torque. In this case, the waiting time and/or the holding time can be reduced in order to enable a quick gear change. If the change in the requested speed level is less than the hold time after the last change in the requested speed level, the hold time can also be increased after the wait. In this way, a condition for a slow request for changing the gear can be successively tightened. The hold time can also be increased in constant steps or non-linearly. The holding time is preferably limited to a predetermined value, which can be approximately 2-3 seconds, for example.
- the waiting time can be set to zero if the hold time has elapsed since the requested speed level was last changed. Alternatively, another initial value can also be used.
- the holding time can also be set to an initial value, which preferably differs from zero.
- the maximum waiting time can be as long as is necessary to disengage the first gear and to engage the second gear in the transmission.
- the delay in a gear change can be so strong that the transmission follows the requested gear at maximum speed.
- a realistic maximum waiting time can be approximately 900 ms in one example.
- a neutral gear N can be activated, in which a power flow in the transmission is interrupted. Torque can then no longer be transmitted between the input shaft and the output shaft. This can correspond to putting the transmission into neutral during the waiting period. From neutral, a gear of an applicable gear can be engaged quickly because another gear does not have to be disengaged first.
- the second driving level can be activated immediately if it is a parking level.
- one or more external conditions can be determined, for example that a driving speed of the motor vehicle is sufficiently low.
- only predetermined changes between gears are taken into account.
- predetermined changes between speed levels cannot be taken into account.
- a change that is not to be taken into account by the method can be implemented directly on the transmission. In different embodiments of the method, such a change can be counted as a rapid change, as a slow change or not at all.
- A is three.
- Practice has shown that a rapid change of more than three gears in a row can lead to an unpleasant build-up of traction.
- a signal can be provided to the driver that the holding time is still running. The driver can then expect delayed implementation of the gear. In another embodiment, the driver can be provided with a signal that indicates that the waiting time has expired.
- the signals can each be provided optically, acoustically or haptically.
- a device for controlling an applicable gear of a transmission for a motor vehicle as a function of a requested gear includes a sensor for detecting a change in the requested gear from a first to a second gear; and a controller.
- the control device is set up to wait until a predetermined waiting time has elapsed if none of the previous A driving steps was requested for longer than a predetermined holding time; and only then to change the applicable gear to the second gear.
- the control device can be set up to carry out a method described herein in whole or in part.
- the control device can include a programmable microcomputer or microcontroller, and the method can be in the form of a computer program product with program code means.
- the computer program product can also be on a computer-readable be stored on disk. Additional features or advantages of the method can be transferred to the device or vice versa.
- a motor vehicle includes a device as described herein.
- the motor vehicle can include, for example, a passenger car, a truck or a bus.
- FIG. 1 shows a control device on board a motor vehicle
- FIG. 2 shows a flow chart of a method
- FIG. 3 shows an exemplary time sequence of events.
- FIG. 1 shows a motor vehicle 100 with a drive train 105 that includes a transmission 110 .
- the transmission 110 can be controlled by means of a device 112 comprising a control device 115 .
- Device 112 is set up to engage different gears with different gears in transmission 110, each of which implements a reduction between an input shaft, which is connected to a drive motor 120, and an output shaft, which is connected to a drive wheel 125 of motor vehicle 100.
- the control device 1 15 can control a gear to be engaged in the transmission 110 according to a gear.
- the driving stage can be specified by a driver of motor vehicle 100 using a selector lever 130 .
- the selector lever 130 can be implemented in any way, for example by a switch, a button or a touchscreen.
- at least the gears P, D, N and R are available for selection; further gears can optionally be provided, for example 2 to set the highest gear to be engaged or L to control a particularly high gear reduction.
- the driver can also choose the strategy with which the gears a gear should be engaged, for example more sporty or more economical.
- Selector lever 130 is set up to provide control device 115 with a driving position requested by the driver or a desired change in the applicable driving position. For this purpose, a mostly digital message is preferably transmitted electrically to the control device 115.
- selector lever 130 does not have any direct influence on a gear selected in transmission 110 , but provides control information to control device 115 , on the basis of which control device 115 controls the engagement of a gear in transmission 110 .
- a driving position that is valid, that is to say one that is decisive for the control device 115, can be transmitted back to the selector lever 130 and displayed by means of an output device 135, for example an optical indicator.
- the output device 135 can also be provided at another location of the motor vehicle 100, for example on an instrument in a dashboard.
- the control device 115 controls a gear engaged in the transmission 110 in addition to the applicable gear, usually depending on a drive or driving state of the motor vehicle 100 or the drive train 105, for example a requested torque, a speed of the drive shaft or a speed of the output shaft.
- the gear requested by the driver can usually be changed by operating the selector lever 130 faster than the current gear can follow it.
- the change in the applicable gear is linked to a mechanical engagement of a gear in the transmission 110 and therefore cannot take place at any desired speed.
- Engaging or disengaging a gear requires the controlled actuation of an actuator. Not every actuator can be controlled proportionally via its actuation path, so that an actuation may not be able to be aborted or, in the event of an abort, there is a risk that a position of the actuator determined by means of a mathematical model will be lost actuator is inaccurate or incorrect.
- a technique is proposed to better track the applicable speed level of the requested speed level.
- FIG. 2 shows a flowchart of a method 200 for controlling a transmission 110 for a motor vehicle 100.
- Method 200 can be executed on a control device 115.
- a transition from a first requested driving stage F1 to a second requested driving stage F2 can be determined. This takes place when the driver actuates selector lever 130 .
- a step 210 it can be determined whether this transition is to be treated in a further differentiated manner with regard to the present method 200 . If, for example, one of the driving stages F1 or F2 relates to a predetermined driving stage such as P, or if a predetermined driving situation of motor vehicle 100 has been determined, such as rocking free, a branch can be made directly to step 230, in which the second driving stage F2 is accepted as valid. Alternatively, it is also possible to branch to a step 235, as indicated by a broken line.
- the change can be determined in a step 215 whether the determined change is to be considered a rapid change. This is the case when the change is determined less than a predetermined hold time th after the change last determined.
- the holding time th can initially assume a predetermined value of, for example, approximately 300-400 ms and can be changed in the course of the method 200 .
- a rapid change it can be determined in a step 220 whether a predetermined number of A previous changes in requested driving stages were each determined as rapid.
- A is preferably at least two or three. If a previous change can no longer be determined, for example at the start of method 200 or because motor vehicle 100 starts a new journey, the missing change can be assumed to be slow.
- the number of past rapid changes is counted and whether this number has reached N.
- a ring memory is provided, in which changes from A past are noted in each case as to whether the change is rapid.
- step 230 in which the second driving step F2 is accepted as valid.
- step 225 in which the elapse of a predetermined waiting time tw is awaited.
- the requested second gear F2 is not accepted during the waiting time tw.
- the neutral driving position N can apply during the waiting time tw and can be implemented immediately.
- the transmission 110 can be controlled into neutral during the waiting time tw.
- no change can be made and a last applicable speed step can be retained.
- the waiting time tw can initially be approximately 100 ms, for example. After the waiting time tw has expired, it can be increased by a predetermined amount, for example approximately 200-400 ms. The increase may depend on the last valid value of th. There is preferably no increase above a predetermined maximum value, which in one embodiment can be approximately 1000 ms.
- the holding time th can also be increased by a predetermined amount, for example 100 ms, with a non-linear increase depending on the applicable holding time th also being able to be provided here.
- the holding time th can also be limited to a predetermined amount, which is, for example, approximately 2 to 3 s.
- the second gear F2 can be accepted as valid.
- a suitable gear can then be determined and engaged in transmission 110 . If it was determined in step 215 that the current change is not considered rapid, then the hold time th can be reset in a step 235 to an assigned initial value. Likewise, the waiting time tw can be reset to an assigned initial value, in particular zero. If counting how many previous changes are considered fast, this number can be set to zero. A branch can then be made to step 230, where the requested second gear F2 is accepted.
- the method 200 may cause a slowly requested gear to be implemented immediately.
- the first A speed steps that are engaged quickly can also be implemented quickly, with a certain delay due to a waiting time tw being able to apply.
- the waiting time tw can increase with each new rapid change in a row.
- the holding time th which is decisive for the assessment of whether a request for a changed speed level is considered fast or slow, can also increase in this case.
- the requested change cannot be implemented at first. Only when the applicable waiting time after the last change request has elapsed can the most recently requested gear be adopted and the transmission 110 controlled with respect to this gear. In another embodiment, after the waiting time has elapsed, the applicable driving step can remain unchanged until a new change request arrives.
- FIG. 3 shows an exemplary time sequence of events relating to a device 100 or a method 200. A time is plotted in the horizontal direction.
- a first course 305 relates to a driver-controlled request to change or engage a gear. Drive levels requested by way of example are indicated in capital letters on the first profile 305 .
- a second curve 310 shows a count of a first timer for the hold time th. The first timer is loaded to a value representing th when a request to change gear is detected. Then the first timer is decremented to zero at a predetermined rate. If a new change request is detected before the first timer reaches zero, then that request is considered fast, otherwise slow.
- a third trace 315 reflects a number of detected consecutive rapid changes. The count is incremented when a fast request is detected and may be reset to zero when the first timer count reaches zero. In this case, a subsequent change can no longer be considered fast and consequently the last A change requests cannot all be fast either. The counting of change requests that follow each other in rapid succession can therefore be restarted.
- a fourth curve 320 shows a count of a second timer for the waiting time tw.
- the second timer is loaded to a value representing tw when a rapid request to change gear is detected and a predetermined number of past change requests have also been rapid.
- the second timer is then decremented to zero at a predetermined rate. While the second timer has a counter reading greater than zero, a change in the applicable gear is preferably prevented. As soon as the counter reading reaches zero, the last requested speed level can be engaged.
- a fifth profile 325 indicates whether the end of a waiting time tw is being awaited.
- the fifth history is a logic 1 if the second timer has a count greater than zero and is a logic 0 otherwise. While the fifth history 325 is a logic one, changing the applicable gear may be prohibited.
- a sixth curve 330 shows a count of a third timer.
- the third timer is loaded to a predetermined value, for example 1000 ms, when a rapid request to change gear is detected and a predetermined number of past change requests were also fast.
- the third timer is then decremented to zero at a predetermined rate. As soon as the counter reading reaches zero, the last requested speed level can be engaged.
- a seventh course reflects a valid driving stage of the control device 110. Driving stages that apply by way of example are indicated in capital letters on the seventh course 305.
- A 1
- Subsequent rapid change requests are delayed by the waiting time tw, which is increased for each subsequent rapid change request.
- the waiting time tw from the fourth quick change request is greater than the time between the request changes, so that the applicable speed step can no longer follow the last requested one. Instead, the last applicable gear can be maintained or the predetermined gear N can be engaged. In order to accept requests again, no further change request may arrive while the waiting time tw is still running. After it has expired, the last valid or the last requested speed step can be accepted as valid.
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 |
|---|---|---|---|
| DE102021214365.2A DE102021214365A1 (de) | 2021-12-15 | 2021-12-15 | Steuerung eines Getriebes |
| PCT/EP2022/084202 WO2023110454A1 (de) | 2021-12-15 | 2022-12-02 | Steuerung eines getriebes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4448987A1 true EP4448987A1 (de) | 2024-10-23 |
Family
ID=84535876
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP22823559.4A Pending EP4448987A1 (de) | 2021-12-15 | 2022-12-02 | Steuerung eines getriebes |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP4448987A1 (de) |
| DE (1) | DE102021214365A1 (de) |
| WO (1) | WO2023110454A1 (de) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4113173B2 (ja) | 2004-09-29 | 2008-07-09 | 本田技研工業株式会社 | 車両用自動変速機の制御装置 |
| EP1929184B1 (de) | 2005-09-08 | 2012-03-07 | Volvo Lastvagnar Ab | Verfahren zur kommunikation einer gangschaltanweisung an ein getriebe |
| DE102011077964B4 (de) * | 2011-06-22 | 2024-10-31 | Zf Friedrichshafen Ag | Verfahren zum Ansteuern einer Schaltposition in einem automatischen oder automatisierten Kraftfahrzeug-Getriebe, sowie Vorrichtung und automatisches oder automatisiertes Getriebe, betrieben mit diesem Verfahren |
| DE102019200076B4 (de) * | 2019-01-07 | 2026-04-02 | Zf Friedrichshafen Ag | Verfahren zur Erhöhung des Komforts beim Reversieren bei einem Kraftfahrzeug umfassend ein Automatgetriebe |
| US10926769B1 (en) * | 2019-09-17 | 2021-02-23 | GM Global Technology Operations LLC | Method and system of controlling a quick succession drive-neutral-drive (D-N-D) shift |
-
2021
- 2021-12-15 DE DE102021214365.2A patent/DE102021214365A1/de active Pending
-
2022
- 2022-12-02 WO PCT/EP2022/084202 patent/WO2023110454A1/de not_active Ceased
- 2022-12-02 EP EP22823559.4A patent/EP4448987A1/de active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE102021214365A1 (de) | 2023-06-15 |
| WO2023110454A1 (de) | 2023-06-22 |
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