WO2017206980A1 - Procédé de détermination d'une fuite dans un système d'embrayage hydraulique d'un véhicule - Google Patents

Procédé de détermination d'une fuite dans un système d'embrayage hydraulique d'un véhicule Download PDF

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Publication number
WO2017206980A1
WO2017206980A1 PCT/DE2017/100370 DE2017100370W WO2017206980A1 WO 2017206980 A1 WO2017206980 A1 WO 2017206980A1 DE 2017100370 W DE2017100370 W DE 2017100370W WO 2017206980 A1 WO2017206980 A1 WO 2017206980A1
Authority
WO
WIPO (PCT)
Prior art keywords
clutch
pressure
leak
actuator
hydrostatic
Prior art date
Application number
PCT/DE2017/100370
Other languages
German (de)
English (en)
Inventor
Steffen Köhler
Marco Treder
Marcus Lipps
Original Assignee
Schaeffler Technologies AG & Co. KG
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 Schaeffler Technologies AG & Co. KG filed Critical Schaeffler Technologies AG & Co. KG
Priority to DE112017002747.0T priority Critical patent/DE112017002747A5/de
Publication of WO2017206980A1 publication Critical patent/WO2017206980A1/fr

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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D48/00—External control of clutches
    • F16D48/06—Control by electric or electronic means, e.g. of fluid pressure
    • F16D48/066—Control of fluid pressure, e.g. using an accumulator
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2500/00—External control of clutches by electric or electronic means
    • F16D2500/30—Signal inputs
    • F16D2500/302—Signal inputs from the actuator
    • F16D2500/3024—Pressure
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2500/00—External control of clutches by electric or electronic means
    • F16D2500/50—Problem to be solved by the control system
    • F16D2500/501—Relating the actuator
    • F16D2500/5014—Filling the actuator cylinder with fluid
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2500/00—External control of clutches by electric or electronic means
    • F16D2500/50—Problem to be solved by the control system
    • F16D2500/51—Relating safety
    • F16D2500/5108—Failure diagnosis
    • F16D2500/511—Leak detection
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2500/00—External control of clutches by electric or electronic means
    • F16D2500/70—Details about the implementation of the control system
    • F16D2500/702—Look-up tables
    • F16D2500/70205—Clutch actuator
    • F16D2500/70217—Pressure

Definitions

  • the invention relates to a method for determining a leakage in a hydraulic clutch system of a vehicle, in which a clutch is actuated by a hydrostatic clutch actuator, wherein a piston mounted in a master cylinder of the hydrostatic clutch actuator is moved axially, which has a pressure medium contained in a hydrostatic path acting on a slave cylinder actuating the clutch and the leakage in the clutch system is detected by a pressure measurement in the clutch actuator and a comparison with a limit value.
  • Clutch path of a clutch controls, wherein the leakage in the clutch system is detected by a pressure measurement in the electromechanical actuator, wherein a maximum pressure of the electro-hydraulic clutch system is determined and then starting from the maximum pressure, a starting pressure is determined, which is rather a starting point for a pressure measurement, wherein a pressure change is measured a predetermined time and the pressure change is compared with a threshold value. If the threshold value is exceeded due to the change in pressure, a leak is detected.
  • an unenclosed closed clutch (normally closed), as used, for example, in manual transmissions, is actuated by a clutch actuator via a hydrostatic path.
  • the piston in the master cylinder is adjusted by an electric motor, whereby a piston in the slave cylinder is actuated via a pressure medium in the hydrostatic section.
  • the piston of the slave cylinder actuates the clutch. It is necessary to seal the hydrostatic path filled with the pressure medium with respect to the environment, which takes place in the clutch actuator by means of various shape sealing rings or O-rings. Sealing elements are also in the clutch include the the release system, especially in the interfaces between the clutch actuator and a line or the release system and the line installed to prevent leakage. A leakage represents an error case of the hydrostatic clutch actuation, in which the function of the clutch, such as opening the clutch or a torque interruption, can no longer be guaranteed.
  • the object is achieved by closing a predetermined pressure limit value during a holding open of the clutch to a leakage.
  • This has the advantage that it can be closed for leakage over an extended period of time in an open state of the clutch, in which there is normally no pressure change in the hydraulic path. This is possible because the known per se Druck-Aktorweg characteristic of the clutch system during the once set position of the Kupplungsak- sector, which remains unchanged, and can be closed at a pressure drop to the leakage.
  • the predetermined pressure limit results from a predetermined, depending on a position of the clutch actuator pressure limit curve.
  • This pressure limiting characteristic can assume completely different values at different positions of the coupling actuator.
  • the corresponding pressure limit value is taken from this pressure limit characteristic curve and measured with currently measured pressure values over a predetermined time period. compared to space. The period is determined by the holding open the clutch.
  • the predetermined pressure limit value is varied under the influence of a fluid temperature compensation of the pressure medium.
  • Pressure fluid changes as a result of temperature changes in the hydraulic path, while the leakage detection at the same time a volume compensation of the pressure medium in the clutch actuator is possible, being dispensed with a snooping operation, for which the clutch would have to be closed again.
  • a position of the clutch actuator is changed as a result of a temperature change of the pressure medium, wherein the new pressure of the pressure medium resulting from the newly set position of the clutch actuator is compared with an altered pressure limit determined from the pressure limit characteristic and a leak is concluded, when the new pressure falls below the changed pressure limit.
  • a straight line is used as the pressure limit characteristic. By selecting the straight line as the pressure limit characteristic, uniform conditions are set during leakage monitoring.
  • a hybrid disconnect clutch of a hybrid vehicle is used as the clutch, wherein the open holding of the hybrid disconnect clutch is kept open during electric driving of the hybrid vehicle.
  • FIG. 1 shows a schematic representation of a hybrid drive
  • FIG. 2 shows a schematic construction of a hydraulic clutch system
  • Fig. 3 shows an embodiment of a pressure limit characteristic for a leakage determination according to the invention.
  • Fig. 1 is a schematic diagram of a drive train 1 of a hybrid vehicle is shown.
  • This drive train 1 comprises an internal combustion engine 2 and an electric motor 3.
  • a hybrid separating clutch 4 is arranged directly behind the internal combustion engine 2.
  • the hybrid disconnect clutch 4 is an unactuated closed clutch, as used for example in manual switch gearboxes.
  • the hybrid separation clutch 4 is designed as a friction clutch.
  • Internal combustion engine 2 and hybrid disconnect clutch 4 are connected to each other via a crankshaft 5.
  • the electric motor 3 has a rotatable rotor 6 and a stationary stator 7.
  • the output shaft 8 of the hybrid disconnect clutch 4 is connected to a transmission 9, which contains a coupling element, not further shown, for example a second clutch or a torque converter, which are arranged between the electric motor 3 and the transmission 9.
  • the transmission 9 transmits the torque generated by the internal combustion engine 2 and / or the electric motor 3 to the drive wheels 10 of the hybrid vehicle.
  • the electric motor 3 and the transmission 9 thereby form a transmission system 1 1.
  • the hybrid disconnect clutch 4 arranged between the internal combustion engine 2 and the electric motor 3 is closed to start the engine 2 during driving of the hybrid vehicle with the torque generated by the electric motor 3 or to drive the engine 2 and the electric motor 3 during a boost operation.
  • the hybrid disconnect clutch is actuated by a hydrostatic clutch actuator 12.
  • FIG. 2 schematically shows the structure of an automatic clutch system 13 using the example of a hydrostatic clutch actuator 12 (HCA) shown schematically, as used in vehicles.
  • the clutch system 13 comprises on the encoder side 14, a control unit 15, which controls a further electric motor 16, which in turn drives a spindle gear 17 for converting the rotational movement of the electric motor 16 in a translational movement of a piston 18 which is mounted axially movable within a master cylinder 19 ,
  • the electric tromotor 16, the piston 18 and the master cylinder 19 form the hydrostatic clutch actuator 12th
  • the master cylinder 19, the hydraulic line 21 and the slave cylinder 23 form the hydraulic route.
  • the slave cylinder 23 engages to actuate the hybrid disconnect clutch 4 in a release bearing 24 which presses against the tongues of a plate spring 25 and thus moves the hybrid disconnect clutch 4.
  • the pressure p in the hydraulic system is measured by a pressure sensor 26 which is positioned on the master cylinder 19.
  • the change in position of the piston 18 is detected via a displacement sensor 27 on the master cylinder 19.
  • the hybrid vehicle drives with a purely electric drive, that is to say simply by actuation of the electric motor 3, the internal combustion engine 2 is disconnected from the drive of the electric motor 3 via the hybrid disconnect clutch 4 by the hybrid disconnect clutch 4 being opened.
  • the clutch actuator 12 assumes a predetermined position. Since the hybrid disconnect clutch 4 is open during the electric driving operation over the entire period of electric driving, the pressure in the clutch system in this time is measured at predetermined intervals.
  • Each currently measured pressure value is compared with a pressure limit to monitor the clutch system 13 for leakage in the state of electric propulsion.
  • the pressure limit value is determined from a pressure limiting characteristic.
  • the pressure limit value corresponds to the point of the pressure limit characteristic which corresponds to the position of the clutch actuator 12 in the open state of the hybrid disconnect clutch 4. If the currently measured pressure value falls below the pressure limit value thus determined, a leakage is detected.
  • 3 shows an exemplary embodiment of a pressure curve during the movement of the piston 18 in the master cylinder 19.
  • the pressure p in the hydraulic system is plotted against the position of the piston 18, which corresponds to the travel of the clutch actuator 12.
  • Curve A shows a pressure limit characteristic as used in the prior art in a transition from a closed state of the hybrid disconnect clutch 4 to an open state.
  • Curve B shows a pressure limiting characteristic according to the invention, which in the given example is constant over the entire actuator path.
  • leakage detection can only take place when several pressure limits are exceeded.
  • Upon detection of the leakage measures are taken by a stored in the control unit 15 software to prevent erroneous clutch operation. This can be done, for example, that the hybrid vehicle can not start the engine 2, but can only drive in electric mode.
  • the use of the pressure limiting characteristic is particularly advantageous whenever a change in volume of the pressure medium occurs as a result of a temperature change during the process of leakage detection during electric driving of the hybrid vehicle, which must be compensated without having to perform a snooping operation.
  • the temperature change in particular a temperature increase of the pressure medium 20, is caused by the electric motor 3 during electric driving. This temperature increase of the pressure medium 20 causes an increase in volume, which entails a pressure change.
  • an algorithm for fluid temperature compensation is stored in the control unit 15. This algorithm calculates which position the piston 18 of the clutch actuator 12 must take in order to reduce the volume increase.
  • the control unit 15 controls the clutch actuator 12 accordingly, so that the position of the clutch actuator 12 changes during the open state of the separating clutch 4. Also in the new position of the clutch actuator 12 at least one pressure measurement is performed, wherein the newly determined pressure is compared with the pressure limit, which was taken from the current limit position of the clutch actuator 12 corresponding to the pressure limit curve (curve B). If the newly determined pressure value is below the newly determined pressure limit value, a leakage is also concluded.
  • the use of the pressure limit characteristic has the advantage that even such fluid temperature changes can be detected and performed in addition to the detection of the leakage.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)

Abstract

L'invention concerne un procédé de détermination d'une fuite dans un système d'embrayage hydraulique d'un véhicule, procédé selon lequel un embrayage est actionné par un actionneur d'embrayage hydrostatique, un piston monté dans un maître-cylindre de l'actionneur d'embrayage hydrostatique étant déplacé axialement, lequel piston agit, par le biais d'un fluide de pression contenu dans une section hydrostatique, sur un cylindre récepteur actionnant l'embrayage, et la fuite dans le système d'embrayage étant détectée par une mesure de pression dans l'actionneur d'embrayage et une comparaison avec une valeur limite. Dans le cadre d'un procédé selon lequel une détection de fuite est possible dans chaque état de fonctionnement de l'embrayage, on conclut à une fuite lorsque l'on passe en dessous d'une valeur limite de pression prédéfinie pendant que l'embrayage est maintenu ouvert.
PCT/DE2017/100370 2016-06-02 2017-05-03 Procédé de détermination d'une fuite dans un système d'embrayage hydraulique d'un véhicule WO2017206980A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE112017002747.0T DE112017002747A5 (de) 2016-06-02 2017-05-03 Verfahren zur Bestimmung einer Leckage in einem hydraulischen Kupplungssystem eines Fahrzeuges

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE102016209665 2016-06-02
DE102016209665.6 2016-06-02
DE102016213966.5 2016-07-29
DE102016213966 2016-07-29

Publications (1)

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WO2017206980A1 true WO2017206980A1 (fr) 2017-12-07

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PCT/DE2017/100370 WO2017206980A1 (fr) 2016-06-02 2017-05-03 Procédé de détermination d'une fuite dans un système d'embrayage hydraulique d'un véhicule

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Country Link
DE (1) DE112017002747A5 (fr)
WO (1) WO2017206980A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019102249A1 (de) 2019-01-30 2020-07-30 Schaeffler Technologies AG & Co. KG Verfahren zur Feststellung einer Leckage in einem eine Kupplung ansteuernden hydraulischen System eines Fahrzeuges
DE102019123111A1 (de) * 2019-08-28 2021-03-04 Schaeffler Technologies AG & Co. KG Verfahren zur Leckageerkennung eines hydrostatischen Kupplungsbetätigungssystems
US12018747B2 (en) 2019-10-15 2024-06-25 Schaeffler Technologies AG &Co. KG Method for controlling a hydraulic unit in particular for a drivetrain of a motor vehicle, hydraulic unit and drivetrain with hydraulic unit

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007003902A1 (de) * 2007-01-19 2008-07-24 Robert Bosch Gmbh Kupplungssystem und Verfahren zur Steuerung eines Kupplungssystems
WO2012083918A1 (fr) * 2010-12-23 2012-06-28 Schaeffler Technologies AG & Co. KG Système d'embrayage hydraulique
WO2013075687A2 (fr) * 2011-11-24 2013-05-30 Schaeffler Technologies AG & Co. KG Système d'actionnement hydraulique
EP2516878B1 (fr) 2009-12-22 2013-08-28 Robert Bosch GmbH Procédé et dispositif pour tester des fuites dans un système d'accouplement électrohydraulique automatisé sur un véhicule

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007003902A1 (de) * 2007-01-19 2008-07-24 Robert Bosch Gmbh Kupplungssystem und Verfahren zur Steuerung eines Kupplungssystems
EP2516878B1 (fr) 2009-12-22 2013-08-28 Robert Bosch GmbH Procédé et dispositif pour tester des fuites dans un système d'accouplement électrohydraulique automatisé sur un véhicule
WO2012083918A1 (fr) * 2010-12-23 2012-06-28 Schaeffler Technologies AG & Co. KG Système d'embrayage hydraulique
WO2013075687A2 (fr) * 2011-11-24 2013-05-30 Schaeffler Technologies AG & Co. KG Système d'actionnement hydraulique

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019102249A1 (de) 2019-01-30 2020-07-30 Schaeffler Technologies AG & Co. KG Verfahren zur Feststellung einer Leckage in einem eine Kupplung ansteuernden hydraulischen System eines Fahrzeuges
DE102019123111A1 (de) * 2019-08-28 2021-03-04 Schaeffler Technologies AG & Co. KG Verfahren zur Leckageerkennung eines hydrostatischen Kupplungsbetätigungssystems
DE102019123111B4 (de) 2019-08-28 2021-09-02 Schaeffler Technologies AG & Co. KG Verfahren zur Leckageerkennung eines hydrostatischen Kupplungsbetätigungssystems
US12018747B2 (en) 2019-10-15 2024-06-25 Schaeffler Technologies AG &Co. KG Method for controlling a hydraulic unit in particular for a drivetrain of a motor vehicle, hydraulic unit and drivetrain with hydraulic unit

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