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
  • F16H61/12—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
  • F16H61/68—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing specially adapted for stepped gearings
  • F16H61/684—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing specially adapted for stepped gearings without interruption of drive
  • F16H61/688—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing specially adapted for stepped gearings without interruption of drive with two inputs, e.g. selection of one of two torque-flow paths by clutches
• • 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
  • F16H2061/1232—Bringing the control into a predefined state, e.g. giving priority to particular actuators or gear ratios
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S477/00—Interrelated power delivery controls, including engine control
  • Y10S477/906—Means detecting or ameliorating the effects of malfunction or potential malfunction

Definitions

• the invention relates to a method for the emergency operation of an automated vehicle dual-clutch transmission with electro-hydraulic control via a transmission control device according to the features of the preamble of patent claim 1.
• Double clutch transmissions are known to consist of two partial transmissions, each with an input shaft, which are connectable via a respective associated, separately actuated clutch with a drive motor.
• the gears for the odd gear ratios for example, and the gears for the even gear ratios are arranged in the second partial transmission.
• one gear stage of a subtransmission is always active with the clutch engaged, while one gear stage of the other subtransmission may be preselected when the clutch is open.
• the closed clutch is opened and the open clutch is closed, in such a way that substantially no torque interruption occurs in the drive train.
• the opening and closing of the two clutches and the switching of the gear stages via a transmission control device.
• actuators for the actuation of the clutches and for the actuation of the switching stages electrohydraulic actuators are generally used. Special control measures must be taken when a fault occurs in the area of the transmission, for example one of the partial transmissions.
• the abovementioned DE 103 38 355 A1 proposes a control method for solving this problem, in which, in the event of a malfunction in the coupling region, the switching states of the clutches immediately before a failure of the clutch control or the electronics are to be maintained at least in some switching states of the clutches.
• the dual-clutch transmission has a separate "state-holding hydraulic system".
• the state-maintaining hydraulic system controls the first or second hydraulics associated with the first and second clutches, at least in some output shift states of the clutches, via hydraulic control lines such that the shift states immediately before the failure of the electronic components Clutches remain maintained. This allows at least to end the current driving maneuver and, for example, to park the vehicle in a targeted manner.
• DE 10 2004 018 962 B3 proposes a method for controlling a hydraulic circuit for a dual-clutch transmission, in which a secure state of the system is ensured by means of a separate safety circuit when an error occurs.
• the safety circuit is designed so that when a partial error, which is associated with only one of the two clutches, this clutch is opened, and that when an overall error associated with the two clutches, the clutch whose clutch pressure is smaller at the occurrence of the total error is opened and the other clutch, the clutch pressure at the occurrence of Velocity error is greater, not open, to maintain the transmission of torque through this clutch. If a partial fault occurs, the vehicle can continue to be operated via the partial transmission not affected by the fault, so that limited driving operation is possible. If a total error occurs, the currently existing driving state is maintained, so that a driving maneuver can be ended and the vehicle safely parked.
• the invention has for its object to provide a method for emergency operation of an automated vehicle dual-clutch transmission, which with a minimum of hardware circuit complexity when a fault occurs in the transmission control or their sensors or their actuators safe driving at least so far allows that a currently occurring driving maneuver safely terminated and the vehicle can be parked specifically.
• the invention is based on the finding that the hardware-related circuit complexity can be considerably reduced if one waives the condition to maintain the drive pressure of the clutches when a fault occurs and instead optionally permits a brief interruption of the drive torque.
• the invention is therefore based on a method for the emergency operation of an automated vehicle dual-clutch transmission with electrohydraulic shear control via a transmission control device, wherein after the occurrence of a disturbance of the transmission and / or its transmission control device indicating fault signal for realizing an emergency operation of the transmission opens a clutch of the dual clutch and the other clutch is pressurized.
• the invention provides that when the interference signal occurs, both clutches are opened and transferred to a safe ground state, and that after reaching the ground state, one of the two clutches is again acted upon by actuating pressure.
• the method is operated so that after reaching the ground state, the clutch is selected with the higher hydraulic pressure at fault time and re-pressurized with operating pressure.
• the output line and ultimately the driving condition of the vehicle and to make the transition to the ground state and the operating state after re-applying the clutch with operating pressure as comfortable as possible is provided according to a further embodiment of the invention that the re-application of selected clutch in conjunction with an intervention in the engine control ("self-sufficient engine intervention") takes place, for example, by the engine torque or the engine speed is adapted to the current driving condition.
• the engine control which is also generally part of the overall vehicle control receives its required signals from known, the driving condition detecting sensors, as need not be executed in detail.
• the engine torque is initially limited to a predetermined lower value and a predetermined transition span is maintained during which the opening of the two clutches, the transition to the safe ground state, the detection of the driving state variables and optionally the re-engagement of the selected clutch with actuation pressure, and that brought after the transition period, the engine torque to a predetermined emergency torque and is limited.
• the trigger of the autonomous engine intervention may be, for example, a so-called “alive-counter" signal of the electronic transmission control device, which functions in such a way that the fault monitoring takes place by means of a signal transmitter which at regular time intervals displays a function signal indicating the proper functioning of the transmission to the engine control outputs, said intervention in the engine control to realize the emergency operation after failure of the function signal and expiration of a predetermined filter period takes place.
• a live-counter signal of the electronic transmission control device which functions in such a way that the fault monitoring takes place by means of a signal transmitter which at regular time intervals displays a function signal indicating the proper functioning of the transmission to the engine control outputs, said intervention in the engine control to realize the emergency operation after failure of the function signal and expiration of a predetermined filter period takes place.
• the proper operation of the transmission is monitored according to a further embodiment of the invention via this associated speed sensors, pressure sensors, torque sensors, position sensors and the like, which transmit their sensor signals to the transmission control device.
• the method according to the invention produces at least one state which permits a continuation of the current driving maneuver, a drive to the next workshop or, if appropriate, a targeted parking of the vehicle.
• the transmission control means changes to an alternative control mode in which the affected hydraulic branch, ie For example, the affected partial transmission is shut down and a limited driving operation with, for example, a shift of the intact partial transmission associated switching stages can be maintained.
• the motor torque M On the ordinate of the axis system shown in the drawing, the motor torque M, on the abscissa the time t is plotted.
• the electronic transmission control device which monitors the proper operation of the transmission with the aid of the above-mentioned sensors, transmits a function signal indicating the proper functioning of the transmission to the engine control system at regular time intervals ⁇ t. As the drawing shows by means of the solid vertical lines, such a function signal is generated at the times ti, t 2 and t 4 .
• the motor controller reacts in such a way that it is lowered from the time t 6, the actual torque 4 to a predetermined lower value 4 'and held for a predetermined transition period t 6 to t 7 .
• the opening of the two clutches takes place, the transition to the safe basic state and the detection of the driving state variables.
• an increase in the actual torque to a predetermined emergency torque 4 " which at least terminate the current maneuver and a targeted stopping of the vehicle or at the time t 7 after re-applying the selected clutch with actuation pressure also allowed a transition to the replacement control mode described above.

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Control Of Transmission Device (AREA)
• Control Of Vehicle Engines Or Engines For Specific Uses (AREA)

Priority Applications (5)

Applications Claiming Priority (2)

Publications (1)

Family

ID=39045045

Family Applications (1)

Country Status (6)

Families Citing this family (11)

Citations (5)

Family Cites Families (13)

• 2006
  • 2006-11-17 DE DE102006054253A patent/DE102006054253A1/de not_active Withdrawn
• 2007
  • 2007-11-05 AT AT07822174T patent/ATE460610T1/de active
  • 2007-11-05 JP JP2009536697A patent/JP2010510448A/ja not_active Ceased
  • 2007-11-05 EP EP07822174A patent/EP2079943B1/de not_active Not-in-force
  • 2007-11-05 DE DE502007003103T patent/DE502007003103D1/de active Active
  • 2007-11-05 US US12/513,932 patent/US8086381B2/en not_active Expired - Fee Related
  • 2007-11-05 WO PCT/EP2007/061845 patent/WO2008058857A1/de not_active Ceased

Patent Citations (5)

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