EP1740851A1 - Dispositif pour actionner un element de changement de vitesse - Google Patents

Dispositif pour actionner un element de changement de vitesse

Info

Publication number
EP1740851A1
EP1740851A1 EP05731000A EP05731000A EP1740851A1 EP 1740851 A1 EP1740851 A1 EP 1740851A1 EP 05731000 A EP05731000 A EP 05731000A EP 05731000 A EP05731000 A EP 05731000A EP 1740851 A1 EP1740851 A1 EP 1740851A1
Authority
EP
European Patent Office
Prior art keywords
switching means
control unit
control pressure
parameter
motor vehicle
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Withdrawn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
EP05731000A
Other languages
German (de)
English (en)
Inventor
Manfred Guggolz
Werner Hillenbrand
Mario Kaller
Markus Veit
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.)
Mercedes Benz Group AG
Original Assignee
DaimlerChrysler 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 DaimlerChrysler AG filed Critical DaimlerChrysler AG
Publication of EP1740851A1 publication Critical patent/EP1740851A1/fr
Withdrawn legal-status Critical Current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
    • F16H61/26—Generation or transmission of movements for final actuating mechanisms
    • F16H61/28—Generation or transmission of movements for final actuating mechanisms with at least one movement of the final actuating mechanism being caused by a non-mechanical force, e.g. power-assisted
    • F16H61/2807—Generation or transmission of movements for final actuating mechanisms with at least one movement of the final actuating mechanism being caused by a non-mechanical force, e.g. power-assisted using electric control signals for shift actuators, e.g. electro-hydraulic control therefor
    • 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
    • F16H61/12—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures
    • 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
    • F16H61/26—Generation or transmission of movements for final actuating mechanisms
    • F16H61/28—Generation or transmission of movements for final actuating mechanisms with at least one movement of the final actuating mechanism being caused by a non-mechanical force, e.g. power-assisted
    • F16H61/30—Hydraulic or pneumatic motors or related fluid control means therefor
    • 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
    • F16H59/68—Inputs being a function of gearing status
    • F16H2059/6807—Status of gear-change operation, e.g. clutch fully engaged
    • 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
    • F16H59/68—Inputs being a function of gearing status
    • F16H2059/683—Sensing pressure in control systems or in fluid controlled devices, e.g. by pressure sensors
    • 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
    • F16H61/12—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures
    • F16H2061/1256—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures characterised by the parts or units where malfunctioning was assumed or detected
    • F16H2061/1288—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures characterised by the parts or units where malfunctioning was assumed or detected the failing part is an actuator

Definitions

  • the invention relates to a device for actuating a switching means according to the preamble of claim 1 and a method for actuating a switching means according to the preamble of claim 11.
  • the invention has for its object to provide a device by means of which a function of a switching means can be checked with little design effort.
  • the switching means is usually connected to a piston movable in a master cylinder and can be provided for selecting an alley of a shiftable transmission or for shifting a gear. Hydraulic or pneumatic pressure is applied to the master cylinder. It is also known to equip devices of the generic type with a pressure sensor which is provided to check that the switching means is functioning correctly. A pressure drop caused, for example, by a failure of a pressure-generating pump can then be sensed and corresponding emergency measures can be taken without damaging the motor vehicle transmission and / or the device.
  • the invention is based on a device for actuating a switching means of a motor vehicle by means of a control pressure, which is provided to deflect the switching means from a rest position.
  • a control unit be provided to record a parameter for a reaction of the switching means to a change in the control pressure, at least in one operating state. It can thereby be achieved that a malfunction of the device is revealed by the parameter.
  • the parameter can be given by a signal from existing sensors. As a result, separate sensors for detecting a malfunction of the device can advantageously be dispensed with.
  • the parameter can be recorded by a sensor unit integrated in the control unit or by a sensor unit that is independent of the control unit.
  • control unit be provided to record a parameter for an adjustment speed of the switching means at least in one operating state.
  • control unit be provided to at least one parameter for a reset to detect speed of the switching means.
  • control unit be provided to at least one parameter for a reset to detect speed of the switching means.
  • a parameter that can be determined with a particularly low design effort is a reset time.
  • other parameters that seem sensible to a person skilled in the art are also conceivable for the response of the switching means to the change in the control pressure and in particular for a time course of the deflection following the change.
  • control unit is intended to determine the control pressure from the detected parameter, it can be achieved that a faulty control pressure, which can be caused, for example, by a malfunction of a pressure generating unit and / or a valve, can be recognized directly.
  • control pressure is derived from a pressure reservoir from which further control pressures for actuating further units can be derived, a pressure drop in the control pressure can advantageously indicate a possible malfunction of the further units and appropriate countermeasures can be taken.
  • control unit in connection with various types of switching units and / or parameters can be achieved if the device includes a memory unit for storing an assignment table for assigning the parameter to the control pressure u.
  • control unit is intended to compare the control pressure determined from the characteristic variable with an extreme control pressure, a drop below a minimum pressure or exceeding a maximum pressure can advantageously be recognized.
  • the switching means is provided for switching an automated motor vehicle transmission, increased operational safety can be achieved and damage to the motor vehicle transmission due to a malfunction can be avoided.
  • the setting of an incorrect aisle position can be avoided if the switching means is provided for switching a aisle position of the automated motor vehicle transmission.
  • the switching means is provided for switching a aisle position of the automated motor vehicle transmission.
  • the use of the device according to the invention is conceivable in connection with any switching means which appears to be useful to the person skilled in the art.
  • Fig. 1 shows an automation device of a motor vehicle transmission in a schematic representation
  • Fig. 2 shows a time course of a control pressure and an axial deflection of a shift shaft from a rest position during a test process.
  • FIG. 1 shows an automation device for the automated actuation of a switching means 10 of a motor vehicle transmission 13 designed as a selector shaft.
  • the switchable motor vehicle transmission 13 can be operated in a known manner by means of a Moving one of three shift rails 15 - 17 can be operated.
  • the switching means 10 has a switching finger 18 which can be brought into engagement with a recess in one of the three switching rails 15-17 by axially displacing the switching means 10.
  • a rotation of the switching means 10 translates through the shift finger 18 into a displacement of the shift rail 15-17 with which the shift finger 18 is engaged.
  • the corresponding shift notes 15-17 shifts a toothing in the motor vehicle transmission 13 and thereby sets a ratio on the motor vehicle transmission 13 which is dependent on the selection of the shift rail 15-17 and a direction of rotation.
  • a gas cylinder 19 comprises a piston 20, which is connected to the switching means 10, in such a way that the switching means 10 designed as a switching shaft is rotatably but axially fixedly mounted on a connecting piece 21 connected to the piston 20, and that the piston 20 is axially displaced leads in the alley cylinder 19 to an axial displacement of the same amount of an alley position s of the switching means 10.
  • the gas cylinder 19 has connection points for two pressure lines 31, 32, via which a volume Vi or a volume V 2 above or below the piston 20 of the gas cylinder 19 can be acted upon by a hydraulic control pressure p.
  • a control unit 11 actuates valves through which the control pressure p can be applied to the volumes Vi, V 2 .
  • the piston 20 of the gas cylinder 19 also interacts with a gas spring 22, which is designed as a compression spring.
  • the gate spring 22 stabilizes a rest position of the switching means 10, in which the switching finger 18 is in engagement with the second shift rail 16, by means of which a first or a second gear of the motor vehicle transmission 13 can be engaged by turning the switching means 10.
  • the piston 20 moves in a first direction up to a stop on an end face of the gas cylinder 19
  • the shifting means 10 connected to the piston 20 also shifts axially, to the extent that the shift finger 18 engages with a first shift rail 15, which is assigned to a third and a fourth gear of the motor vehicle transmission 13.
  • the force exerted by the control pressure p on the piston 20 acts against a restoring force of the gate spring 22.
  • the gate spring 22 is compressed by a first driver element 23 connected to the piston 20 and by a second driver element 24 connected to a housing of the motor vehicle transmission 13.
  • the piston 20 moves analogously in a second axial direction up to a stop on a second end face of the valve Gas cylinder 19.
  • the shifting means 10 connected to the piston 20 also shifts axially, to the extent that the shift finger 18 engages with a third shift rail 17, which is assigned to a reverse gear of the motor vehicle transmission 13.
  • the force exerted by the control pressure p on the piston 20 acts against a restoring force of the gas spring 22.
  • the gas spring 22 is compressed by a third driving element 25 connected to the piston 20 and by a fourth driving element 26 connected to a housing of the motor vehicle transmission 13, whereby the first entrainment element 23 and the second entrainment element 24 detach from the gate spring 22.
  • control unit 11 is provided to actuate a gear cylinder 27, one with the switching means Includes 10 rotatably connected pistons. By opening and / or closing further valves, the control unit 11 causes a displacement of the piston in the gear cylinder 27, which is translated into a rotation of the switching means 10.
  • the rotation of the switching means 10 is, as described above, translated by the shift finger 18 into a displacement of those switching tickets 15-17 with which the shift finger 18 is engaged.
  • the control unit 11 is also connected via a sensor line 28 to a gas sensor 29, which detects an axial gas position s of the piston 20 or the switching means 10 and forwards it to the control unit 11. Furthermore, the control unit 11 has an interface 30, by means of which it communicates with other units of the motor vehicle comprising the automation device and via which it can receive control signals.
  • control unit 11 receives a control signal via the interface 30, which is provided to start a pressure measurement program, a programmable arithmetic unit of the control unit 11 starts a pressure measurement program implemented in the arithmetic unit.
  • the course of the pressure measurement program differs depending on whether a gear of the motor vehicle transmission 13 is engaged or not.
  • the control unit 11 opens the first valve at a first point in time ti (FIG. 2) and aerates the first volume Vi with the control pressure p.
  • the control pressure p increases to its saturation value within a filling time of about 300 ms due to the finite flow cross section of the valve.
  • the force exerted by the control pressure p on the piston 20 exceeds a biasing force of the gate spring 22, whereupon the switching means 10 is deflected from its rest position.
  • the piston 20 and the switching means 10 shift in the first axial direction until the piston 20 comes to a stop at a time t 3 on the end face of the gas cylinder 19.
  • the control unit 11 has then deflected the switching means 10 for test purposes. If the filling time has elapsed, the control unit 11 opens an outlet valve at a time t and vents the volume Vi. A time measuring unit 14 of the control unit 11 begins to measure a time running from the time t. Up to a time ts, the control pressure p is greater than the spring force generated by the gate spring 22 in the stop configuration, which resets the piston 20 and the switching means 10 to its rest position in the time interval following the time ts.
  • the alley position s sensed by the gas sensor 29 falls below a threshold value stored in a storage unit 12 of the control unit 11 and the time measurement unit 14 stops the time measurement.
  • the control unit 11 stores the value measured by the time measuring unit 14 as a parameter T in the storage unit 12.
  • the control unit 11 starts an analog pressure measurement program, in which, in contrast to the method described above, the piston 20 does not come to a stop on the end face of the gas cylinder 19, but the shift finger 18 moves within a clearance of the recess Shift rail 15 - 17 moves, with which the shift finger 18 is currently engaged. Accordingly, the alley position s only changes by a few millimeters.
  • the control unit 11 applies a threshold value s 0 adapted to the gear.
  • the value determined by the time measuring unit 14 is multiplied by the control unit 11 by a correction factor which takes into account the different filling volumes of the individual gears.
  • the control unit 11 uses the corrected value as a parameter T.
  • the characteristic variable T characterizes the response of the switching means 10 to the change in the control pressure p in the volume Vi and at the time t 4 . Since the time required for the switching means 10 to reach the threshold value s 0 is determined by an adjustment speed of the switching means 10, the value determined by the time measuring unit 14 is at the same time a parameter T for the adjustment speed or for a reset speed of the switching means 10 The parameter T designates more precisely a reset time.
  • An allocation table is stored in the storage unit 12 of the control unit 11, from which the computing unit of the control unit 11 can read out a stored value depending on the detected characteristic variable T, which represents the control pressure p, which usually leads to the measurement of the detected characteristic variable T. As a result, the control unit 11 assigns the detected parameter T to the control pressure p.
  • the control unit 11 makes the determined control pressure p available for the CAN bus of the motor vehicle via the interface 30.
  • control unit 11 after the determination of the control pressure p compares the control unit the control pressure p with a program stored in the storage unit 12 Extremal Kunststoffdruck p m i n, which is a minimum value. If the determined control pressure p is less than the extreme control pressure p ra i n , the control unit 11 makes corresponding error information available via the CAN bus, which leads to the activation of an emergency mode of the motor vehicle.
  • the time measuring unit 14 instead of the time interval between the times t and t ⁇ , determines a different time interval which appears to be useful to the person skilled in the art.
  • the control unit 11 is provided to deflect the switching means 10 a little by a small change in pressure in one of the volumes V 1 ⁇ V 2 , without the piston 20 or the switching finger 18 coming to a stop. From the reaction determined via the gas sensor 29 -lü ⁇
  • control unit 11 can draw conclusions about the rigidity of the system and thus about the control pressure p by means of an allocation table stored in the storage unit 12.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gear-Shifting Mechanisms (AREA)
  • Control Of Transmission Device (AREA)

Abstract

La présente invention concerne un dispositif pour actionner un élément changement de vitesse (10) d'un véhicule automobile, au moyen d'une pression de commande (p) qui sert à dévier l'élément de changement de vitesse (10) par rapport à une position de repos. Selon l'invention, une unité de commande (11) sert à détecter, au moins dans un état de fonctionnement, un paramètre (T) d'une réaction de l'élément de changement de vitesse (10) à la modification de la pression de commande (p).
EP05731000A 2004-04-27 2005-04-14 Dispositif pour actionner un element de changement de vitesse Withdrawn EP1740851A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004020437A DE102004020437A1 (de) 2004-04-27 2004-04-27 Vorrichtung zum Betätigen eines Schaltmittels
PCT/EP2005/003942 WO2005108828A1 (fr) 2004-04-27 2005-04-14 Dispositif pour actionner un element de changement de vitesse

Publications (1)

Publication Number Publication Date
EP1740851A1 true EP1740851A1 (fr) 2007-01-10

Family

ID=34963952

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05731000A Withdrawn EP1740851A1 (fr) 2004-04-27 2005-04-14 Dispositif pour actionner un element de changement de vitesse

Country Status (5)

Country Link
US (1) US20070213173A1 (fr)
EP (1) EP1740851A1 (fr)
JP (1) JP2007534905A (fr)
DE (1) DE102004020437A1 (fr)
WO (1) WO2005108828A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6610656B1 (en) * 1993-12-30 2003-08-26 President And Fellows Of Harvard College Method of promoting chondrocyte differentiation with hedgehog related polypeptides
DE102008041399A1 (de) * 2008-08-20 2010-02-25 Zf Friedrichshafen Ag Verfahren zum Betreiben einer hydraulischen oder pneumatischen Steuerungseinrichtung eines automatisierten Schaltgetriebes
DE102011087858B4 (de) * 2011-12-07 2024-01-18 Zf Friedrichshafen Ag Verfahren zur Systemdruckansteuerung für ein Automatgetriebe umfassend formschlüssige Schaltelemente
KR101656961B1 (ko) * 2014-12-31 2016-09-12 현대다이모스(주) 차량의 압력센서 고장진단방법

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0702168A3 (fr) * 1994-08-25 1996-06-12 Michael Meyerle Transmission hydromécanique à division de puissance
DE19542993A1 (de) * 1994-11-18 1996-08-29 Michael Meyerle Stufenloses Getriebe, insbesondere mit Leistungsverzweigung
DE19756639A1 (de) * 1997-12-19 1999-06-24 Zahnradfabrik Friedrichshafen Schalteinrichtung
JP2001065689A (ja) * 1999-09-01 2001-03-16 Aisin Ai Co Ltd 変速機のコントロール装置
NO312564B1 (no) * 2000-01-25 2002-05-27 Kongsberg Automotive Asa Girskifteanordning for kjöretöyer
GB0025000D0 (en) * 2000-10-12 2000-11-29 Luk Lamellen & Kupplungsbau Hydraulic actuation systems
JP4596628B2 (ja) * 2000-10-31 2010-12-08 アイシン・エーアイ株式会社 同期噛合式変速機の制御装置
JP2002147601A (ja) * 2000-11-13 2002-05-22 Fuji Heavy Ind Ltd 車両用自動変速機の制御装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2005108828A1 *

Also Published As

Publication number Publication date
JP2007534905A (ja) 2007-11-29
WO2005108828A1 (fr) 2005-11-17
US20070213173A1 (en) 2007-09-13
DE102004020437A1 (de) 2005-12-01

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