EP2313670A1 - Method for operating a hydraulic or pneumatic control device of a semi-automatic transmission - Google Patents

Method for operating a hydraulic or pneumatic control device of a semi-automatic transmission

Info

Publication number
EP2313670A1
EP2313670A1 EP09780348A EP09780348A EP2313670A1 EP 2313670 A1 EP2313670 A1 EP 2313670A1 EP 09780348 A EP09780348 A EP 09780348A EP 09780348 A EP09780348 A EP 09780348A EP 2313670 A1 EP2313670 A1 EP 2313670A1
Authority
EP
European Patent Office
Prior art keywords
pressure
main switching
switching valves
control
measured
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Withdrawn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
EP09780348A
Other languages
German (de)
French (fr)
Inventor
Rainer Petzold
Mario Steinborn
Alfred Brühn
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
Publication of EP2313670A1 publication Critical patent/EP2313670A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
    • F15B19/005—Fault detection or monitoring
    • 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
    • F16H61/2807—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
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/3056—Assemblies of multiple valves
    • F15B2211/30565—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve
    • F15B2211/3057—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve having two valves, one for each port of a double-acting output member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/32—Directional control characterised by the type of actuation
    • F15B2211/327—Directional control characterised by the type of actuation electrically or electronically
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40576—Assemblies of multiple valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
    • F15B2211/41509—Flow control characterised by the connections of the flow control means in the circuit being connected to a pressure source and a directional control valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/42—Flow control characterised by the type of actuation
    • F15B2211/426—Flow control characterised by the type of actuation electrically or electronically
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • F15B2211/6306—Electronic controllers using input signals representing a pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • F15B2211/6336—Electronic controllers using input signals representing a state of the output member, e.g. position, speed or acceleration
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/80—Other types of control related to particular problems or conditions
    • F15B2211/855—Testing of fluid pressure systems
    • 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
    • F16H2061/1208—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures with diagnostic check cycles; Monitoring of 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
    • F16H61/12—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures
    • F16H2061/122—Avoiding failures by using redundant parts
    • 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
    • F16H2061/126—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 the controller
    • F16H2061/1264—Hydraulic parts of the controller, e.g. a sticking valve or clogged channel

Definitions

  • the invention relates to a method for operating a hydraulic or pneumatic control device of an automated manual transmission according to the preamble of claim 1.
  • the hydraulic or pneumatic control device 1 of an automated manual transmission of a motor vehicle, shown in FIG. 1, is known.
  • the control device 1 shown in Fig. 1 comprises a driven by a motor 2 pump 3 to pressure medium, such. B. hydraulic oil or compressed air via a suction line 4 and a check valve 5 from a reservoir 6 and an oil sump 7 in a main pressure line 8 to promote.
  • a pressure accumulator 9 is connected to the main pressure line 8.
  • the control device of FIG. 1 has a plurality of adjusting devices, of which only two adjusting devices 13 and 14 are shown.
  • the adjusting devices 13 and 14 which may be selector dividers and switching dividers or just switching dividers, are each in the form of actuating cylinders 15, 16, each having two pressure chambers 19a, 19b and 20a, 20b separated by a piston 17, 18 having.
  • the pressure chambers 19a, 19b of the first actuating device 13 are in each case connected via a connecting line 21a, 21b to the output of a control valve 22a, 22b designed as a 3/2-way magnetic switching valve.
  • the control valve 22a the first pressure chamber 19a of the adjusting device 13 is selectively connectable via a return line 23a and a check valve 24a to the pressure-free line 12 or via an inflow line 25a to a pressure line 26.
  • the second pressure chamber 19b of the steepening device 13 through the associated control valve 22b selectively connectable via a return flow line 23b and a check valve 24b to the pressure-free line 12 or via an inflow line 25b to the pressure line 26.
  • the pressure chambers 20a and 20b of the adjusting device 14 are in each case connected via a connecting line 31a, 31b to the output of a control valve 32a, 32b designed as a 3/2-way magnetic switching valve.
  • the associated first control valve 32a of the first pressure chamber 20a of the actuator 14 is selectively connectable via a return line 33a and a check valve 34a with the pressure-free line 12 or via an inflow line 35a to the pressure line 26.
  • the second pressure chamber 20b of the adjusting device 14 through the associated second control valve 32b selectively connectable via a return flow line 33b and a check valve 34b with the pressure-free line 12 or via an inflow line 35b to the pressure line 26.
  • an accumulator 27 is connected to the pressure line 26. Further, a pressure sensor 28 is connected to the pressure line 26, the z. B. for measuring the actuation pressures in the pressure chambers 19a, 19b, 20a, 20b of the adjusting devices 13, 14 can be used.
  • a preferably electronically designed control unit 29 is connected via electrical control lines 3oA 1 30b, 40a, 40b with the control valves 21a, 21b, 31a, 31b of the adjusting devices associated, via a further electrical control line 36 is the control unit 29 to the motor 2 and a sensor line 37 with the pressure sensor 28 in conjunction.
  • control device 1 of FIG. 1 has a plurality of, namely in the exemplary embodiment shown, two main switching valves 45a and 45b connected in parallel, which are connected between the main pressure line 8 and the pressure line 26.
  • the main switching valves 45a and 45b are each designed as 2/2-way magnetic switching valves according to FIG. 1, and are in each case connected via an electrical control line 46a, 46b to the control unit 29, so that they can be controlled independently of one another.
  • a functional check of the main switching valves 45a, 45b is to be carried out on the control device 1 of FIG. 1, this is done as usual in practice by actuating the main switching valves 45a, 45b via the electronic control unit 29, so as to generate an electrical or electronic Diagnosis and functional testing of the main switching valves 45a and 45b to realize.
  • Such a diagnosis of the main switching valves 45a and 45b can not be made during the regular operation of the control device 1. There is therefore a need for a method for operating such a control device, in which a diagnosis or functional testing of the main switching valves 45a and 45b is also possible during the regular operation of the control device.
  • the present invention is based on the problem to provide a novel method for operating a hydraulic or pneumatic control device of an automated manual transmission.
  • At least one measuring signal is detected with the aid of the or each sensor depending on the activation of the main switching valves, wherein the or each detected measuring signal is compared with a stored for the respective control of the main switching valves Soilsignal, and wherein if a deviation between a measurement signal and the respective reference signal is determined, a defect is closed at least one of the main switching valves.
  • the diagnosis or functional testing of the main switching valves takes place indirectly by evaluating measuring signals of at least one sensor of the control device 1.
  • Fig. 1 is a schematic representation of a hydraulic or pneumatic control device of an automated manual transmission to illustrate the method according to the invention.
  • At least one measuring signal is detected by the actuation of the main switching valves 45a, 45b, wherein the or each detected measuring signal is compared with a setpoint signal stored for the respective actuation of the main switching valves 45a, 45b, and wherein if a deviation between a measuring signal and the respective setpoint signal is determined, a defect of at least one main switching valve 45a, 45b is closed.
  • a defect of at least one of the main switching valves 45a, 45b is closed according to the invention.
  • this indirect diagnosis or functional check of the main switching valves 45a, 45b can also take place by evaluation of measuring signals of the displacement sensors 10, 11.
  • a travel of the respective inclined cylinder 15, 16 is measured with the aid of the displacement sensors 10, 11, the measured travel paths being compared with reference travel paths stored for the respective actuation of the main switching valves 45a, 45b. and wherein, when a deviation between the measured travel paths and the solo travel paths is determined, a defect of at least one of the main switching valves 45a, 45b is closed.
  • Table 2 shows that by way of example for a defective or non-controllable, permanently open mainshaft valve 45b, with deviations from the desired state (Table 1) being highlighted for two functional mainshift valves 45a, 45b by underlining.
  • control unit 30a 30b control line 31a, 31b connecting line 32a, 32b control valve 33a, 33b return flow line 34a, 34b check valve 35a, 35b inflow line 36 control line 37 sensor line 40a, 40b control line 45a, 45b main switching valve 46a, 46b control line

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

The invention relates to a method for operating a hydraulic or pneumatic control device of a semi-automatic transmission, wherein the control device comprises actuators (13, 14) having actuating cylinders (15, 16), wherein pressure chambers (19a, 19b, 20a, 20b) of the actuating cylinders (15, 16) can each be connected to a pressure line (26) through a control valve (22a, 22b, 32a, 32b), wherein the pressure line (26) can be selectively connected to a main pressure line (8) or shut off from said main pressure line through redundant main control valves (45a, 45b) connected in parallel, and wherein the control device comprises at least one sensor (10, 11, 28). According to the invention, at least one measurement signal is collected using the one or each sensor (10, 11, 28) depending on the activation of the main control valves (45a, 45b), wherein the one or each collected measurement signal is compared with a target signal stored for the respective activation of the main control valves (45a, 45b), and wherein if a deviation between a measurement signal and the respective target signal is detected, a defect of at least one of the main control valves (45a, 45b) is indicated.

Description

Verfahren zum Betreiben einer hydraulischen oder pneumatischen Steue- rungseinrichtunα eines automatisierten Schaltgetriebes Method for operating a hydraulic or pneumatic control device of an automated manual transmission
Die Erfindung betrifft ein Verfahren zum Betreiben einer hydraulischen oder pneumatischen Steuerungseinrichtung eines automatisierten Schaltgetriebes nach dem Oberbegriff des Anspruchs 1.The invention relates to a method for operating a hydraulic or pneumatic control device of an automated manual transmission according to the preamble of claim 1.
Aus der DE 102006 040476 A1 ist die in Fig. 1 dargestellte, hydraulische bzw. pneumatische Steuerungseinrichtung 1 eines automatisierten Schaltgetriebes eines Kraftfahrzeugs bekannt. Die in Fig. 1 dargestellte Steuerungseinrichtung 1 umfasst eine von einem Motor 2 angetriebene Pumpe 3, um Druckmittel, wie z. B. Hydrauliköl oder Druckluft über eine Saugleitung 4 und ein Rückschlagventil 5 aus einem Vorratsbehälter 6 bzw. einem ölsumpf 7 in eine Hauptdruckleitung 8 zu fördern. Zum Ausgleich von Druckschwankungen ist ein Druckspeicher 9 an die Hauptdruckleitung 8 angeschlossen. Die Steuerungseinrichtung der Fig. 1 weist mehrere Stelleinrichtungen auf, von denen lediglich zwei Stelleinrichtungen 13 und 14 gezeigt sind. Die Stelleinrichtungen 13 und 14, bei welchen es sich um Wählsteiler und Schaltsteiler oder auch nur um Schaltsteiler handeln kann, sind jeweils als Stellzylinder 15, 16 ausgebildet, die jeweils zwei durch einen Kolben 17, 18 getrennte Druckräume 19a, 19b bzw. 20a, 20b aufweist. Die Druckräume 19a, 19b der ersten Stelleinrichtung 13 stehen jeweils über eine Verbindungsleitung 21a, 21b mit dem Ausgang eines als 3/2-Wege-Magnetschaltventil ausgebildeten Steuerungsventils 22a, 22b in Verbindung. Durch das Steuerungsventil 22a ist der erste Druckraum 19a der Stelleinrichtung 13 selektiv über eine Rückflussleitung 23a und ein Rückschlagventil 24a mit der Drucklosleitung 12 oder über eine Zuflussleitung 25a mit einer Druckleitung 26 verbindbar. Ebenso ist der zweite Druckraum 19b der Steileinrichtung 13 durch das zugeordnete Steuerungsventil 22b selektiv über eine Rückflussleitung 23b und ein Rückschlagventil 24b mit der Drucklosleitung 12 oder über eine Zuflussleitung 25b mit der Druckleitung 26 verbindbar. In gleicher Art und Weise stehen die Druckräume 20a und 20b der Stelleinrichtung 14 jeweils über eine Verbindungsleitung 31a, 31b mit dem Ausgang eines als 3/2-Wege-Magnetschaltventil ausgebildeten Steuerungsventils 32a, 32b in Verbindung. Durch das zugeordnete erste Steuerungsventil 32a ist der erste Druckraum 20a der Stelleinrichtung 14 selektiv über eine Rückflussleitung 33a und ein Rückschlagventil 34a mit der Drucklosleitung 12 oder über eine Zuflussleitung 35a mit der Druckleitung 26 verbindbar. Ebenso ist der zweite Druckraum 20b der Stelleinrichtung 14 durch das zugeordnete zweite Steuerungsventil 32b selektiv über eine Rückflussleitung 33b und ein Rückschlagventil 34b mit der Drucklosleitung 12 oder über eine Zuflussleitung 35b mit der Druckleitung 26 verbindbar.From DE 102006 040476 A1, the hydraulic or pneumatic control device 1 of an automated manual transmission of a motor vehicle, shown in FIG. 1, is known. The control device 1 shown in Fig. 1 comprises a driven by a motor 2 pump 3 to pressure medium, such. B. hydraulic oil or compressed air via a suction line 4 and a check valve 5 from a reservoir 6 and an oil sump 7 in a main pressure line 8 to promote. To compensate for pressure fluctuations, a pressure accumulator 9 is connected to the main pressure line 8. The control device of FIG. 1 has a plurality of adjusting devices, of which only two adjusting devices 13 and 14 are shown. The adjusting devices 13 and 14, which may be selector dividers and switching dividers or just switching dividers, are each in the form of actuating cylinders 15, 16, each having two pressure chambers 19a, 19b and 20a, 20b separated by a piston 17, 18 having. The pressure chambers 19a, 19b of the first actuating device 13 are in each case connected via a connecting line 21a, 21b to the output of a control valve 22a, 22b designed as a 3/2-way magnetic switching valve. By the control valve 22a, the first pressure chamber 19a of the adjusting device 13 is selectively connectable via a return line 23a and a check valve 24a to the pressure-free line 12 or via an inflow line 25a to a pressure line 26. Likewise, the second pressure chamber 19b of the steepening device 13 through the associated control valve 22b selectively connectable via a return flow line 23b and a check valve 24b to the pressure-free line 12 or via an inflow line 25b to the pressure line 26. In the same way, the pressure chambers 20a and 20b of the adjusting device 14 are in each case connected via a connecting line 31a, 31b to the output of a control valve 32a, 32b designed as a 3/2-way magnetic switching valve. By the associated first control valve 32a of the first pressure chamber 20a of the actuator 14 is selectively connectable via a return line 33a and a check valve 34a with the pressure-free line 12 or via an inflow line 35a to the pressure line 26. Likewise, the second pressure chamber 20b of the adjusting device 14 through the associated second control valve 32b selectively connectable via a return flow line 33b and a check valve 34b with the pressure-free line 12 or via an inflow line 35b to the pressure line 26.
Zum Ausgleich von Druckschwankungen ist ein Druckspeicher 27 an die Druckleitung 26 angeschlossen. Ferner ist an die Druckleitung 26 ein Drucksensor 28 angeschlossen, der z. B. zur Messung der Betätigungsdrücke in den Druckräumen 19a, 19b, 20a, 20b der Stelleinrichtungen 13, 14 verwendet werden kann. Ein vorzugsweise elektronisch ausgebildetes Steuerungsgerät 29 steht über elektrische Steuerleitungen 3Oa1 30b, 40a, 40b mit den Steuerungsventilen 21a, 21b, 31a, 31b der Stelleinrichtungen in Verbindung, über eine weitere elektrische Steuerleitung 36 steht das Steuergerät 29 mit dem Motor 2 und über eine Sensorleitung 37 mit dem Drucksensor 28 in Verbindung.To compensate for pressure fluctuations, an accumulator 27 is connected to the pressure line 26. Further, a pressure sensor 28 is connected to the pressure line 26, the z. B. for measuring the actuation pressures in the pressure chambers 19a, 19b, 20a, 20b of the adjusting devices 13, 14 can be used. A preferably electronically designed control unit 29 is connected via electrical control lines 3oA 1 30b, 40a, 40b with the control valves 21a, 21b, 31a, 31b of the adjusting devices associated, via a further electrical control line 36 is the control unit 29 to the motor 2 and a sensor line 37 with the pressure sensor 28 in conjunction.
Ferner verfügt die Steuerungseinrichtung 1 der Fig. 1 über mehrere, nämlich im gezeigten Ausführungsbeispiel über zwei, parallel geschaltete Hauptschaltventile 45a und 45b, die zwischen die Hauptdruckleitung 8 und die Druckleitung 26 geschaltet sind. Die Hauptschaltventile 45a und 45b sind gemäß Fig. 1 jeweils als 2/2-Wege-Magnetschaltventile ausgebildet, und stehen jeweils über eine elektrische Steuerleitung 46a, 46b mit dem Steuergerät 29 in Verbindung, sodass sie unabhängig voneinander ansteuerbar sind. Die Steuerungseinrichtung 1 der Fig. 1 verfügt demnach über redundante Hauptabschaltventile 45a, 45b, wobei bei Ausfall eines der Hauptschaltventile 45a oder 45b durch das nicht gestörte Hauptschaltventil 45b oder 45a die Funktionstüchtigkeit der Steuerungseinrichtung 1 erhalten bleibt, wenn auch mit reduzierter Dynamik, also verlängerten Schaltzeiten des die Steuerungseinrichtung aufweisenden, automatisierten Schaltgetriebes.Furthermore, the control device 1 of FIG. 1 has a plurality of, namely in the exemplary embodiment shown, two main switching valves 45a and 45b connected in parallel, which are connected between the main pressure line 8 and the pressure line 26. The main switching valves 45a and 45b are each designed as 2/2-way magnetic switching valves according to FIG. 1, and are in each case connected via an electrical control line 46a, 46b to the control unit 29, so that they can be controlled independently of one another. The control device 1 of FIG. 1 therefore has redundant Hauptabschaltventile 45a, 45b, wherein in case of failure of the main switching valves 45a or 45b by the undisturbed main switching valve 45b or 45a, the functionality of the controller 1 is maintained, albeit with reduced dynamics, ie extended switching times of the control device having, automated transmission.
Weiterhin ist es bereits bekannt, den Stellzylindern 15, 16 Wegsensoren 10, 11 zuzuordnen, mit Hilfe derer die Position der Stellzylinder 15, 16 überwacht werden kann.Furthermore, it is already known to assign the positioning cylinders 15, 16 displacement sensors 10, 11, by means of which the position of the actuating cylinder 15, 16 can be monitored.
Soll an der Steuerungseinrichtung 1 der Fig. 1 eine Funktionsüberprüfung der Hauptschaltventile 45a, 45b durchgeführt werden, so erfolgt dies wie aus der Praxis üblich dadurch, dass die Hauptschaltventile 45a, 45b über das elektronische Steuergerät 29 angesteuert werden, um so eine elektrische bzw. elektronische Diagnose bzw. Funktionsprüfung der Hauptschaltventile 45a und 45b zu realisieren. Eine solche Diagnose der Hauptschaltventile 45a und 45b kann nicht während des regulären Betriebs der Steuerungseinrichtung 1 erfolgen. Es besteht daher Bedarf an einem Verfahren zum Betreiben einer solchen Steuerungseinrichtung, bei welcher eine Diagnose bzw. Funktionsprüfung der Hauptschaltventile 45a und 45b auch während des regulären Betriebs der Steuerungseinrichtung möglich ist.If a functional check of the main switching valves 45a, 45b is to be carried out on the control device 1 of FIG. 1, this is done as usual in practice by actuating the main switching valves 45a, 45b via the electronic control unit 29, so as to generate an electrical or electronic Diagnosis and functional testing of the main switching valves 45a and 45b to realize. Such a diagnosis of the main switching valves 45a and 45b can not be made during the regular operation of the control device 1. There is therefore a need for a method for operating such a control device, in which a diagnosis or functional testing of the main switching valves 45a and 45b is also possible during the regular operation of the control device.
Hiervon ausgehend liegt der vorliegenden Erfindung das Problem zu Grunde, ein neuartiges Verfahren zum Betreiben einer hydraulischen oder pneumatischen Steuerungseinrichtung eines automatisierten Schaltgetriebes zu schaffen.On this basis, the present invention is based on the problem to provide a novel method for operating a hydraulic or pneumatic control device of an automated manual transmission.
Dieses Problem wird durch ein Verfahren gemäß Anspruch 1 gelöst. Erfindungsgemäß wird mit Hilfe des oder jeden Sensors abhängig von der Ansteuerung der Hauptschaltventile mindestens ein Messsignal erfasst, wobei das oder jedes erfasste Messsignal mit einem für die jeweilige Ansteuerung der Hauptschaltventile hinterlegten Soilsignal verglichen wird, und wobei dann, wenn eine Abweichung zwischen einem Messsignal und dem jeweiligen Sollsignal ermittelt wird, auf einen Defekt mindestens eines der Hauptschaltventile geschlossen wird.This problem is solved by a method according to claim 1. According to the invention, at least one measuring signal is detected with the aid of the or each sensor depending on the activation of the main switching valves, wherein the or each detected measuring signal is compared with a stored for the respective control of the main switching valves Soilsignal, and wherein if a deviation between a measurement signal and the respective reference signal is determined, a defect is closed at least one of the main switching valves.
Beim erfindungsgemäßen Verfahren erfolgt die Diagnose bzw. Funktionsprüfung der Hauptschaltventile auf indirektem Weg durch Auswertung von Messsignalen mindestens eines Sensors der Steuerungseinrichtung 1.In the method according to the invention, the diagnosis or functional testing of the main switching valves takes place indirectly by evaluating measuring signals of at least one sensor of the control device 1.
Hierdurch ist es möglich, die Hauptschaltventile auch während des regulären Betriebs der Steuerungseinrichtung einer Funktionsprüfung und damit Diagnose zu unterziehen.This makes it possible to subject the main switching valves during normal operation of the control device of a functional test and thus diagnosis.
Bevorzugte Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen und der nachfolgenden Beschreibung. Ausführungsbeispiele der Erfindung werden, ohne hierauf beschränkt zu sein, an Hand der Zeichnung näher erläutert. Dabei zeigt:Preferred embodiments of the invention will become apparent from the dependent claims and the description below. Embodiments of the invention will be described, without being limited thereto, with reference to the drawings. Showing:
Fig. 1 eine schematisierte Darstellung einer hydraulischen oder pneumatischen Steuerungseinrichtung eines automatisierten Schaltgetriebes zur Verdeutlichung des erfindungsgemäßen Verfahrens.Fig. 1 is a schematic representation of a hydraulic or pneumatic control device of an automated manual transmission to illustrate the method according to the invention.
Das erfindungsgemäße Verfahren zum Betreiben einer hydraulischen oder pneumatischen Steuerungseinrichtung eines automatisierten Schaltgetriebes wird nachfolgend unter Bezugnahme auf Fig. 1 beschrieben. Im Sinne der hier vorliegenden Erfindung erfolgt eine Funktionsdiagnose bzw. Funktionsüberprüfung der Hauptschaltventile 45a, 45b der in Fig. 1 gezeigten Steuerungseinrichtung 1 nicht über eine elektrische bzw. elektronische Ansteuerung derselben über das Steuergerät 29, sondern vielmehr dadurch, dass mit Hilfe mindestens eines Sensors abhängig von der Ansteuerung der Hauptschaltventile 45a, 45b mindestens ein Messsignal erfasst wird, wobei das oder jedes erfasste Messsignal mit einem für die jeweilige Ansteuerung der Hauptschaltventile 45a, 45b hinterlegten Sollsignal verglichen wird, und wobei dann, wenn eine Abweichung zwischen einem Messsignal und dem jeweiligen Sollsignal ermittelt wird, auf einen Defekt mindestens eines Hauptschaltventils 45a, 45b geschlossen wird.The method according to the invention for operating a hydraulic or pneumatic control device of an automated manual transmission will be described below with reference to FIG. 1. For the purposes of the present invention, a functional diagnosis or functional check of the main switching valves 45a, 45b of the control device 1 shown in FIG. 1 does not take place via an electrical or electronic control of the same via the control unit 29, but rather by being dependent on at least one sensor at least one measuring signal is detected by the actuation of the main switching valves 45a, 45b, wherein the or each detected measuring signal is compared with a setpoint signal stored for the respective actuation of the main switching valves 45a, 45b, and wherein if a deviation between a measuring signal and the respective setpoint signal is determined, a defect of at least one main switching valve 45a, 45b is closed.
So ist es z. B. möglich, mit Hilfe des an die Druckleitung 26 angeschlossenen, zwischen die Hauptschaltventile 45a, 45b und die Steuerungsventile 22a, 22b, 32a, 32b geschalteten Drucksensors 28 abhängig von der Ansteuerung der Hauptschaltventile 45a, 45b einen Druck und/oder einen Druckgradienten zu messen, und den gemessenen Druck und/oder den gemessenen Druckgradienten mit einem für die jeweilige Ansteuerung der Hauptschaltventile hinterlegten Solldruck und/oder mit einem für die jeweilige Ansteuerung der Hauptschaltventile 45a, 45b hinterlegten Solldruckgradienten zu vergleichen.So it is z. Example, with the aid of connected to the pressure line 26, between the main switching valves 45a, 45b and the control valves 22a, 22b, 32a, 32b connected pressure sensor 28 depending on the control of the main switching valves 45a, 45b to measure a pressure and / or a pressure gradient and to compare the measured pressure and / or the measured pressure gradient with a desired pressure stored for the respective actuation of the main switching valves and / or with a desired pressure gradient stored for the respective actuation of the main switching valves 45a, 45b.
Dann, wenn eine Abweichung zwischen dem gemessenen Druck und/oder dem gemessenen Druckgradienten und dem hinterlegten Solldruck und/oder dem hinterlegten Solldruckgradienten ermittelt wird, wird erfindungsgemäß auf einen Defekt mindestens eines der Hauptschaltventile 45a, 45b geschlossen.Then, if a deviation between the measured pressure and / or the measured pressure gradient and the stored target pressure and / or the stored target pressure gradient is determined, a defect of at least one of the main switching valves 45a, 45b is closed according to the invention.
Alternativ oder zusätzlich kann diese indirekte Diagnose bzw. Funktionsüberprüfung der Hauptschaltventile 45a, 45b auch durch Auswertung von Messsignalen der Wegsensoren 10, 11 erfolgen. In diesem Fall wird dann abhängig von der Ansteuerung der Hauptschaltventile 45a, 45b mit Hilfe der Wegsensoren 10, 11 ein Stellweg des jeweiligen Steilzylinders 15, 16 gemessen, wobei die gemessenen Stellwege mit für die jeweilige Ansteuerung der Hauptschaltventile 45a, 45b hinterlegten Sollstellwegen verglichen werden, und wobei dann, wenn eine Abweichung zwischen den gemessenen Stellwegen und den Solisteltwegen ermittelt wird, auf einen Defekt mindestens eines der Hauptschaltventile 45a, 45b geschlossen wird.Alternatively or additionally, this indirect diagnosis or functional check of the main switching valves 45a, 45b can also take place by evaluation of measuring signals of the displacement sensors 10, 11. In this case, depending on the actuation of the main switching valves 45a, 45b, a travel of the respective inclined cylinder 15, 16 is measured with the aid of the displacement sensors 10, 11, the measured travel paths being compared with reference travel paths stored for the respective actuation of the main switching valves 45a, 45b. and wherein, when a deviation between the measured travel paths and the solo travel paths is determined, a defect of at least one of the main switching valves 45a, 45b is closed.
Für Fig. 1 soll nachfolgend davon ausgegangen werden, dass die erfindungsgemäße indirekte Funktionsdiagnose der Hauptschaltventile 45a, 45b mit Hilfe des Drucksensors 28 erfolgt, wobei dann, wenn beide Hauptschaltventile 45a, 45b nicht angesteuert und demnach geschlossen sind, für den Drucksensor 28 als Solldruck ein minimaler Druck vorgegeben ist, wobei dann, wenn beide Hauptschaltventile 45a und 45b angesteuert und demnach geöffnet sind, für den Drucksensor 28 als Solldruck ein maximaler Druck sowie als Solldruckgradient ein maximaler Druckgradient hinterlegt ist, und wobei dann, wenn nur eines der beiden Hauptschaltventile 45a und 45b angesteuert und damit geöffnet und das andere nicht angesteuert und damit geschlossen ist, als Solldruck ein maximaler Druck und als Solldruckgradient ein kleinerer Gradient als der maximale Druckgradient hinterlegt ist. Diese Sollwerte für Druck und Druckgradient für zwei funktionsfähige Hauptschaltventile 45a, 45b gibt die nachfolgende Tabelle 1 wieder.1 is to be assumed below that the indirect functional diagnosis of the main switching valves 45a, 45b according to the invention is carried out with the aid of the pressure sensor 28, wherein when both main switching valves 45a, 45b are not activated and therefore closed, for the pressure sensor 28 as a target pressure predetermined minimum pressure, wherein when both main switching valves 45a and 45b are activated and therefore open, for the pressure sensor 28 as the target pressure, a maximum pressure and as Solldruckgradient a maximum pressure gradient is stored, and wherein if only one of the two main switching valves 45a and 45b actuated and thus opened and the other is not driven and thus closed, as target pressure, a maximum pressure and a target gradient as a smaller gradient than the maximum pressure gradient is deposited. These setpoint values for pressure and pressure gradient for two operational main switching valves 45a, 45b are reproduced in Table 1 below.
Tabelle 1 Ist z. B. eines der Hauptschaltventiie 45a, 45b funktionsfähig und das andere Hauptschaltventil 45b bzw. 45a nicht ansteuerbar jedoch geöffnet, so kann unter Verwendung des Messsignals des Drucksensors 28 eine Funktionsdiagnose der Hauptschaltventile 45a, 45b dadurch erfolgen, dass dann, wenn das defekte Hauptschaltventil 45a bzw. 45b nicht angesteuert und damit geschlossen sein soll, am Drucksensor 28 ein vom Solldruck und/oder Solldruckgradienten abweichender Druck und/oder Druckgradient gemessen wird. Dies zeigt nachfolgende Tabelle 2 exemplarisch für ein defektes bzw. nicht ansteuerbares, dauerhaft geöffnetes Hauptschaitventil 45b, wobei Abweichungen vom Sollzustand (Tabelle 1) für zwei funktionsfähige Hauptschaltventile 45a, 45b durch Unterstreichung hervorgehoben sind.Table 1 Is z. B. one of Hauptschaltventiie 45a, 45b operable and the other main switching valve 45b or 45a not controllable open, however, so using the measurement signal of the pressure sensor 28, a function diagnosis of the main switching valves 45a, 45b take place in that when the defective main switching valve 45a or 45b is not actuated and should therefore be closed, a pressure and / or pressure gradient deviating from the desired pressure and / or nominal pressure gradient is measured at the pressure sensor 28. This is shown in Table 2 below by way of example for a defective or non-controllable, permanently open mainshaft valve 45b, with deviations from the desired state (Table 1) being highlighted for two functional mainshift valves 45a, 45b by underlining.
Tabelle 2Table 2
Gleiches ist dann der Fall, wenn eines der beiden Hauptschaltventiie 45a bzw.45b defekt und dauerhaft geschlossen ist. Die nachfolgende Tabelle 3 zeigt dies exemplarisch für ein defektes bzw. nicht ansteuerbares, dauerhaft geschlossenes Hauptschaltventil 45b, wobei Abweichungen vom Solizustand (Tabelle 1) für zwei funktionsfähige Hauptschaltventiie 45a, 45b durch Unterstreichung hervorgehoben sind.The same is the case when one of the two Hauptschaltventiie 45a bzw.45b is defective and permanently closed. The following Table 3 shows this by way of example for a defective or not controllable, permanently closed main switching valve 45b, with deviations from the solitary state (Table 1) for two functional Hauptschaltventiie 45a, 45b are highlighted by underlining.
Tabelle 3 BezugszeichenTable 3 reference numeral
1 Steuerungseinrichtung1 control device
2 Motor2 engine
3 Pumpe3 pump
4 Saugleitung4 suction line
5 Rückschlagventil5 check valve
6 Vorratsbehälter6 reservoir
7 ölsumpf7 oil sump
8 Hauptdruckleitung8 main pressure line
9 Druckspeicher9 accumulator
10 Wegsensor10 way sensor
11 Wegsensor11 displacement sensor
12 Drucklosleitung12 pressure-free line
13 Stelleinrichtung13 adjusting device
14 Stelleinrichtung14 adjusting device
15 Stelizylinder15 Stelizylinder
16 Stelizylinder16 Stelizylinder
17 Kolben17 pistons
18 Kolben18 pistons
19a, 19b Druckraum19a, 19b pressure chamber
20a, 20b Druckraum20a, 20b pressure chamber
21a, 21b Verbindungsleitung21a, 21b connecting line
22a, 22b Steuerungsventil22a, 22b control valve
23a, 23b Rückflussleitung23a, 23b reflux line
24a, 24b Rückschlagventil24a, 24b check valve
25a, 25b Zuflussleitung25a, 25b inflow line
26 Druckleitung26 pressure line
27 Druckspeicher27 accumulator
28 Drucksensor28 pressure sensor
29 Steuerungsgerät 30a, 30b Steuerleitung 31a, 31b Verbindungsleitung 32a, 32b Steuerungsventil 33a, 33b Rückflussleitung 34a, 34b Rückschlagventil 35a, 35b Zuflussleitung 36 Steuerleitung 37 Sensorleitung 40a, 40b Steuerleitung 45a, 45b Hauptschaltventil 46a, 46b Steuerleitung 29 control unit 30a, 30b control line 31a, 31b connecting line 32a, 32b control valve 33a, 33b return flow line 34a, 34b check valve 35a, 35b inflow line 36 control line 37 sensor line 40a, 40b control line 45a, 45b main switching valve 46a, 46b control line

Claims

Patentansprüche claims
1. Verfahren zum Betreiben einer hydraulischen oder pneumatischen Steuerungseinrichtung eines automatisierten Schaltgetriebes, wobei die Steuerungseinrichtung Stelleinrichtungen mit Stellzylindern umfasst, wobei Druckräume der Stellzylinder jeweils über ein Steuerventil mit einer Druckleitung verbindbar sind, wobei die Druckleitung über redundante, paraltel geschaltete Hauptschaltventile selektiv mit einer Hauptdruckleitung verbindbar oder gegen diese absperrbar ist, und wobei die Steuerungseinrichtung mindestens einen Sensor umfasst, dadurch gekennzeichnet, dass mit Hilfe des oder jeden Sensors abhängig von der Ansteuerung der Hauptschaltventile mindestens ein Messsignai erfasst wird, dass das oder jedes erfasste Messsignal mit einem für die jeweilige Ansteuerung der Hauptschaltventile hinterlegten Sollsignal verglichen wird, und dass dann, wenn eine Abweichung zwischen einem Messsignal und dem jeweiligen Sollsignal ermittelt wird, auf einen Defekt mindestens eines der Hauptschaltventile geschlossen wird.1. A method for operating a hydraulic or pneumatic control device of an automated gearbox, wherein the control device comprises adjusting devices with adjusting cylinders, wherein pressure chambers of the actuating cylinder are each connected via a control valve with a pressure line, wherein the pressure line via redundant, paraltel switched main switching valves selectively connectable to a main pressure line or against these can be shut off, and wherein the control device comprises at least one sensor, characterized in that with the aid of the or each sensor depending on the control of the main switching valves at least one Messsignai is detected that the or each detected measurement signal with a for the respective control of Main control valves deposited reference signal is compared, and that when a deviation between a measurement signal and the respective reference signal is determined, a defect at least one of the main scarf closed valves.
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass mit Hilfe mindestens eines an die Druckleitung angeschlossenen, zwischen den Hauptschaltventilen und den Steuerventilen positionierten Drucksensors, abhängig von der Ansteuerung der Hauptschaltventile ein Druck und/oder ein Druckgradient gemessen wird, dass der gemessene Druck und/oder der gemessene Druckgradient mit einem für die jeweilige Ansteuerung der Hauptschaltventile hinterlegten Solldruck und/oder mit einem für die jeweilige Ansteuerung der Hauptschaltventile hinterlegten Solldruckgradienten verglichen wird, und dass dann, wenn eine Abweichung zwischen dem gemessenen Druck und/oder dem gemessenen Druckgradienten und dem hinterlegten Solldruck und/oder dem hinterlegten Solldruckgradienten ermittelt wird, auf einen Defekt mindestens eines der Hauptschaltventile geschlossen wird. 2. The method according to claim 1, characterized in that with the aid of at least one connected to the pressure line, positioned between the main switching valves and the control valves pressure sensor, depending on the control of the main switching valves, a pressure and / or a pressure gradient is measured that the measured pressure and or the measured pressure gradient is compared with a desired pressure gradient stored for the respective actuation of the main switching valves and / or with a desired pressure gradient stored for the respective control of the main switching valves, and that if a deviation between the measured pressure and / or the measured pressure gradient and deposited target pressure and / or the stored target pressure gradient is determined, a defect of at least one of the main switching valves is closed.
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass jedem Stellzylindern mindestens ein Wegsensor zugeordnet ist, dass abhängig von der Ansteuerung der Hauptschaltventile ein Stellweg jedes Stell- zylinders gemessen wird, und dass die gemessenen Stellwege mit für die jeweilige Ansteuerung der Hauptschaltventile hinterlegten Sollstellwegen verglichen wird, und dass dann, wenn eine Abweichung zwischen den gemessenen Stellwegen und den Sollstellwegen ermittelt wird, auf einen Defekt mindestens eines der Hauptschaltventile geschlossen wird. 3. The method according to claim 1 or 2, characterized in that each adjusting cylinders at least one displacement sensor is assigned, that depending on the control of the main switching valves a travel of each actuator cylinder is measured, and that the measured travel paths deposited with for the respective control of the main switching valves Sollstellwegen is compared, and that when a deviation between the measured travel ranges and the target travel is determined, a defect of at least one of the main switching valves is closed.
EP09780348A 2008-08-20 2009-07-09 Method for operating a hydraulic or pneumatic control device of a semi-automatic transmission Withdrawn EP2313670A1 (en)

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