DE19807349A1 - Method of controlling automatic transmission of a wheel loader - Google Patents

Method of controlling automatic transmission of a wheel loader

Info

Publication number
DE19807349A1
DE19807349A1 DE1998107349 DE19807349A DE19807349A1 DE 19807349 A1 DE19807349 A1 DE 19807349A1 DE 1998107349 DE1998107349 DE 1998107349 DE 19807349 A DE19807349 A DE 19807349A DE 19807349 A1 DE19807349 A1 DE 19807349A1
Authority
DE
Germany
Prior art keywords
gear
transmission
range
programmed
automatic
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Withdrawn
Application number
DE1998107349
Other languages
German (de)
Inventor
Bernd Aumann
Hugo Burkhart
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ZF Friedrichshafen AG
Original Assignee
ZF Friedrichshafen AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by ZF Friedrichshafen AG filed Critical ZF Friedrichshafen AG
Priority to DE1998107349 priority Critical patent/DE19807349A1/en
Priority to PCT/EP1999/000910 priority patent/WO1999042746A1/en
Publication of DE19807349A1 publication Critical patent/DE19807349A1/en
Withdrawn legal-status Critical Current

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
    • F16H61/02—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
    • 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
    • F16H2061/023—Drive-off gear selection, i.e. optimising gear ratio for drive off of a vehicle
    • 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
    • F16H59/20—Kickdown

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Transmission Device (AREA)

Abstract

An electronic transmission controller activates the automatic mode of the transmission at system start. If the gear lever remains in the neutral position, the transmission selects an optimal gear for the driving conditions within a programmed range. A lower gear not in the programmed range is selected if an additional load is detected at the torque converter or accelerator pedal. The method involves using an electronic transmission controller which activates the automatic mode of the transmission at system start and if the gear lever remains in the neutral position for a defined period, so that preselecting the forward or reverse range causes a start-off gear to be selected, the transmission then selects an optimal gear for the driving conditions within a programmed range. A lower gear not in the programmed range is selected if an additional load is detected at the torque converter or accelerator pedal. When the additional load is not present the transmission changes back up into the normal programmed range.

Description

Die vorliegende Erfindung betrifft ein Verfahren zur Steuerung eines automatischen Getriebes, insbesondere eines Lastschaltgetriebes für einen Radlader, mittels einer elek­ tronischen Getriebesteuerung.The present invention relates to a method for Control of an automatic transmission, especially one Power shift transmission for a wheel loader, by means of an elec tronic transmission control.

Ein automatisches Getriebe für Kraftfahrzeuge weist üblicherweise einen hydrodynamischen Wandler, Kupplungen, Bremsen, ein hydraulisches Steuergerät und eine elektroni­ sche Getriebesteuerung auf, wobei letztere in Abhängigkeit von bestimmten Eingangsgrößen über das hydraulische Steu­ ergerät die Kupplungen und Bremsen derart ansteuert, daß über eine geeignete Kupplungs-/Brems-Kombination ein ent­ sprechender Gang bzw. eine Übersetzung definiert wird. Als Eingangsgrößen für die elektronische Getriebesteuerung können z. B. die Getriebeeingangsdrehzahl und die Getriebe­ ausgangsdrehzahl verwendet werden, wobei eine Hoch- oder Rückschaltung von einer ersten Übersetzung zu einer zweiten Übersetzung ausgeführt wird, indem eine erste Kupplung oder Bremse öffnet und eine zweite Kupplung oder Bremse schließt, während die elektronische Getriebesteuerung z. B. mit Beginn der Schaltung zyklisch aus der gemessenen Getriebeausgangsdrehzahl eine erste Kenngröße in Form ei­ nes Produktes aus Getriebeausgangsdrehzahl und erster Über­ setzung berechnet und z. B. als zweite Kenngröße die Ge­ triebeeingangsdrehzahl mißt, wie es in der DE P 195 36 339 der Anmelderin beschrieben ist.An automatic transmission for motor vehicles has usually a hydrodynamic converter, couplings, Brakes, a hydraulic control unit and an electronic cal transmission control, the latter depending of certain input variables via the hydraulic control it controls the clutches and brakes in such a way that a suitable clutch / brake combination speaking course or a translation is defined. As Input variables for electronic transmission control can e.g. B. the transmission input speed and the transmission output speed are used, with a high or Downshift from a first translation to a second Translation is carried out by a first clutch or Brake opens and a second clutch or brake closes while the electronic transmission control e.g. B. cyclically from the measured at the beginning of the circuit Transmission output speed a first parameter in the form of egg product of gearbox output speed and first over settlement calculated and z. B. as a second parameter, the Ge drive input speed measures, as in DE P 195 36 339 the applicant is described.

Bei den meisten automatischen Getrieben kann der Fah­ rer aus mehreren Automatikfahrbereichen und definierten Festgängen auswählen, wobei für den Normalbetrieb nur ein eingeschränkter Gangbereich benötigt wird. Erst bei hoher Zugkraftanforderung, wie sie z. B. bei Radladern durch das Befüllen oder bei Personenkraftwagen mit Anhängern bei Bergauffahrt auftritt, muß eine niedrigere Gangstufe ein­ gelegt werden, die oftmals nicht zum gewählten Automatik­ fahrbereich gehört. In diesem Fall muß der Fahrer den Fahrschalter oder einen Rückschaltschalter betätigen, um diesen niedrigeren, den neuen Fahrbedingungen angepaßten Gang schalten zu können, wonach zur Rückkehr in den norma­ len Fahrbereich, wie er durch die programmierten Gänge vor­ gegeben ist, erneut den Fahrschalter bzw. den Rückschalt­ schalter betätigen muß.With most automatic transmissions, the Fah rer from several automatic driving ranges and defined Select fixed routes, whereby only one for normal operation  restricted aisle area is required. Only at high Traction requirement, as z. B. in wheel loaders by Filling or in the case of passenger cars with trailers Uphill, a lower gear must be selected which are often not related to the selected automatic heard the driving range. In this case, the driver must Operate the travel switch or a downshift switch to these lower, adapted to the new driving conditions To be able to change gear, then return to norma len driving range as he through the programmed gears is given, the drive switch or the downshift again must operate the switch.

Aufgabe der Erfindung ist es, ein optimiertes Verfah­ ren zur Steuerung eines automatischen Getriebes zu schaf­ fen.The object of the invention is an optimized procedure to control an automatic transmission fen.

Die Lösung dieser Aufgabe erfolgt mit den im Patentan­ spruch angegebenen Verfahrensschritten.This problem is solved with those in Patentan Say specified process steps.

Beim Systemstart, beim Wechsel der Fahrtrichtungsvor­ wahl von V nach R und umgekehrt (Radlader + Reversiergang) und beim Verweilen des Fahrschalters in der Neutralposition während eines vorgegebenen Zeitraums t < t1 (mit t1 = 1 sec) aktiviert die elektronische Getriebesteuerung den Au­ tomatikmodus mit eingeschränktem Fahrbereich des Getriebes.At system start, when changing the direction of travel choice from V to R and vice versa (wheel loader + reverse gear) and when the control switch remains in the neutral position for a predetermined period of time t <t1 (with t1 = 1 sec) the electronic transmission control activates the Au automatic mode with limited gear range.

Wählt der Fahrer die Vorwärtsfahrtrichtung V vor, so schaltet das Getriebe in den aktuellen Anfahrgang in Fahrt­ richtung vorwärts.If the driver selects the forward direction V, so switches the transmission to the current starting gear direction forward.

Vorwärts vorwählen heißt dabei, daß der Fahrer den Fahrschalter von der Stellung N in Stellung V verschiebt. Preselecting forward means that the driver Moves the travel switch from position N to position V.  

Wählt der Fahrer die Rückwärtsfahrtrichtung R vor, so schaltet das Getriebe in den geschwindigkeitsangepaßten Rückwärtsgang innerhalb des Automatikfahrbereichs, wobei der zweite (bis dritte) Gang Standardanfahrgänge sind. Bei Fahrzeugstillstand wird immer in den zweiten Gang geschal­ tet.If the driver selects the reverse direction R, so switches the transmission to the speed-adjusted Reverse gear within the automatic driving range, whereby the second (to third) gear are standard starting gears. At The vehicle is at a standstill always in second gear tet.

Rückwärts vorwählen heißt dabei, daß der Fahrer den Fahrschalterhebel aus der Stellung N in die Stellung R ver­ schiebt.Preselecting backwards means that the driver takes the Ver switch lever from position N to position R ver pushes.

Nachdem der Fahrer eine Fahrtrichtung ausgewählt und einlegt hat, wählt das automatische Getriebe mit Hilfe der elektronischen Getriebesteuerung in Abhängigkeit von Fahr­ geschwindigkeit und Last den optimalen Gang innerhalb des programmierten vorgegebenen Automatikfahrbereichs.After the driver selected a direction of travel and has engaged, selects the automatic transmission using the electronic transmission control depending on driving speed and load the optimal gear within the programmed preset automatic driving range.

Tritt nun eine plötzliche erhöhte Zugkraftanforderung auf, z. B. weil das Fahrzeug einen Anhänger zieht und eine Steigung hinauffährt, so sorgt eine am Wandler oder am Gas­ pedal vorgesehene Lasterkennung dafür, daß die elektroni­ sche Getriebesteuerung auch niedrigere Gänge schaltet, die außerhalb des fest programmierten gewählten Gangbereiches sind. Bei Normalbetrieb bleibt das automatische Getriebe mit Hilfe der elektronischen Getriebesteuerung im limitier­ ten Gangbereich; bei Lastanforderung schaltet die Laster­ kennung einen entsprechend niedrigeren Gang ein; entfällt diese zusätzliche Lastanforderung, so schaltet die elektro­ nische Steuerung in Abhängigkeit von Lasterkennung und Fahrzeuggeschwindigkeit das Getriebe wieder in den normalen Automatikbereich hoch, so daß der Fahrer keine manuelle Fahrschaltebewegung durchführen muß.Now there is a sudden increased traction requirement on, e.g. B. because the vehicle pulls a trailer and one Drives up a slope, so one takes care of the converter or the gas Load detection provided for the pedal that the electronics cal transmission control also shifts lower gears that outside the permanently programmed selected gear range are. The automatic transmission remains in normal operation with the help of electronic transmission control in the limit th corridor area; the truck switches when the load is requested a correspondingly lower gear; not applicable this additional load request, so the electro switches African control depending on load detection and Vehicle speed the transmission back to normal Automatic range high so that the driver has no manual Carrier switch movement must perform.

Claims (1)

Verfahren zur Steuerung eines automatischen Getriebes mittels einer elektronischen Getriebesteuerung, wobei beim Systemstart und beim Verweilen des Fahrschalters in der Neutralposition während eines vorgegebenen Zeitraums t < t1 (mit t1 = 1 sec) die elektronische Getriebesteuerung den Automatikmodus des Getriebes aktiviert, so daß bei Vorwahl des Vorwärtsfahrbereiches oder Rückwärtsfahrbereiches durch den Fahrer ein Anfahrgang eingelegt wird und danach das automatische Getriebe jeweils den den Fahrbedingungen ent­ sprechenden optimalen Gang innerhalb eines programmierten Bereichs schaltet, wobei bei zusätzlicher Zugkraftanforde­ rung eine am Drehmomentwandler oder am Gaspedal vorgesehene Lasterkennung einen nicht zum programmierten Bereich gehö­ renden niedrigeren Gang automatisch schaltet und bei Weg­ fall dieser zusätzlichen Lastanforderung, in Abhängigkeit von Lasterkennung und Fahrzeuggeschwindigkeit, wieder von diesem niedrigeren Gang in den normalen programmierten Au­ tomatikbereich hochschaltet.Method for controlling an automatic transmission by means of an electronic transmission control, the System start and when the driving switch stays in the Neutral position for a predetermined period of time t <t1 (with t1 = 1 sec) the electronic transmission control Automatic mode of the gearbox activated so that when preselected of the forward driving range or reverse driving range the driver is put into a start gear and then that automatic gearbox according to the driving conditions speaking optimal gear within a programmed Area switches, with additional traction required tion provided on the torque converter or on the accelerator pedal Load detection is not part of the programmed range The lower gear automatically shifts and when away case of this additional load requirement, depending of load detection and vehicle speed, again of this lower gear in the normal programmed Au upshifts tomato range.
DE1998107349 1998-02-20 1998-02-20 Method of controlling automatic transmission of a wheel loader Withdrawn DE19807349A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE1998107349 DE19807349A1 (en) 1998-02-20 1998-02-20 Method of controlling automatic transmission of a wheel loader
PCT/EP1999/000910 WO1999042746A1 (en) 1998-02-20 1999-02-12 Method for controlling an automatic transmission

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1998107349 DE19807349A1 (en) 1998-02-20 1998-02-20 Method of controlling automatic transmission of a wheel loader

Publications (1)

Publication Number Publication Date
DE19807349A1 true DE19807349A1 (en) 1999-08-26

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ID=7858519

Family Applications (1)

Application Number Title Priority Date Filing Date
DE1998107349 Withdrawn DE19807349A1 (en) 1998-02-20 1998-02-20 Method of controlling automatic transmission of a wheel loader

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DE (1) DE19807349A1 (en)
WO (1) WO1999042746A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114347989B (en) * 2021-12-13 2024-04-16 潍柴动力股份有限公司 Vehicle speed control method and device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3939303A1 (en) * 1988-11-28 1990-09-27 Nissan Motor SWITCH CONTROL DEVICE FOR AN AUTOMATIC TRANSMISSION FOR MOTOR VEHICLES
WO1992013215A1 (en) * 1991-01-22 1992-08-06 Zf Friedrichshafen Ag Gear and gear-range selector for a semi-automatic or fully automatic vehicle gearbox
US5351570A (en) * 1991-12-19 1994-10-04 Mitsubishi Jukogyo Kabushiki Kaisha Electronically controlled automatic transmission for vehicles
DE4311886A1 (en) * 1993-04-10 1994-10-13 Porsche Ag Device and method for controlling an automatic transmission
DE19636629A1 (en) * 1995-09-21 1997-03-27 Volkswagen Ag Vehicle automatic gearbox control system with hydraulic torque converter

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE417413B (en) * 1979-06-28 1981-03-16 Volvo Bm SET TO CONTROL A POWER TRANSMISSION DEVICE AND DEVICE FOR EXECUTING THE SET
US5165307A (en) * 1990-04-26 1992-11-24 Dickey-John Corporation Transmission controller
US5406862A (en) * 1993-11-02 1995-04-18 Eaton Corporation Method and apparatus for selecting a starting gear in an automated mechanical transmission
DE19536339A1 (en) 1995-09-29 1997-04-03 Zahnradfabrik Friedrichshafen Safety system for an automatic transmission

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3939303A1 (en) * 1988-11-28 1990-09-27 Nissan Motor SWITCH CONTROL DEVICE FOR AN AUTOMATIC TRANSMISSION FOR MOTOR VEHICLES
WO1992013215A1 (en) * 1991-01-22 1992-08-06 Zf Friedrichshafen Ag Gear and gear-range selector for a semi-automatic or fully automatic vehicle gearbox
US5351570A (en) * 1991-12-19 1994-10-04 Mitsubishi Jukogyo Kabushiki Kaisha Electronically controlled automatic transmission for vehicles
DE4311886A1 (en) * 1993-04-10 1994-10-13 Porsche Ag Device and method for controlling an automatic transmission
DE19636629A1 (en) * 1995-09-21 1997-03-27 Volkswagen Ag Vehicle automatic gearbox control system with hydraulic torque converter

Also Published As

Publication number Publication date
WO1999042746A1 (en) 1999-08-26

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8139 Disposal/non-payment of the annual fee