WO2014044274A2 - Procédé de commande d'un dispositif à embrayages à friction - Google Patents

Procédé de commande d'un dispositif à embrayages à friction Download PDF

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Publication number
WO2014044274A2
WO2014044274A2 PCT/DE2013/200170 DE2013200170W WO2014044274A2 WO 2014044274 A2 WO2014044274 A2 WO 2014044274A2 DE 2013200170 W DE2013200170 W DE 2013200170W WO 2014044274 A2 WO2014044274 A2 WO 2014044274A2
Authority
WO
WIPO (PCT)
Prior art keywords
friction clutch
clutch
friction
clutch device
operating
Prior art date
Application number
PCT/DE2013/200170
Other languages
German (de)
English (en)
Other versions
WO2014044274A3 (fr
Inventor
Sébastien MIQUEL
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 DE112013004536.2T priority Critical patent/DE112013004536A5/de
Priority to CN201380047311.7A priority patent/CN104620009B/zh
Publication of WO2014044274A2 publication Critical patent/WO2014044274A2/fr
Publication of WO2014044274A3 publication Critical patent/WO2014044274A3/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
    • 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
    • F16D2500/10—System to be controlled
    • F16D2500/104—Clutch
    • F16D2500/10406—Clutch position
    • F16D2500/10412—Transmission line of a vehicle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2500/00—External control of clutches by electric or electronic means
    • F16D2500/10—System to be controlled
    • F16D2500/104—Clutch
    • F16D2500/10443—Clutch type
    • F16D2500/1045—Friction clutch
    • 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
    • F16D2500/304—Signal inputs from the clutch
    • F16D2500/30404—Clutch temperature
    • 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
    • F16D2500/304—Signal inputs from the clutch
    • F16D2500/3041—Signal inputs from the clutch from the input shaft
    • F16D2500/30415—Speed of the input shaft
    • 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
    • F16D2500/704—Output parameters from the control unit; Target parameters to be controlled
    • F16D2500/70402—Actuator parameters
    • 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
    • F16D2500/704—Output parameters from the control unit; Target parameters to be controlled
    • F16D2500/70422—Clutch parameters
    • F16D2500/7043—Clutch temperature
    • 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
    • F16D2500/706—Strategy of control
    • F16D2500/70605—Adaptive correction; Modifying control system parameters, e.g. gains, constants, look-up tables

Definitions

  • the invention relates to a method for controlling a friction clutch device with at least one friction clutch and an adjusting device.
  • friction clutch is known at least consisting of a clutch housing with a rotatably and axially limited to this movable pressure plate, which is supported by a lever on the clutch housing lever system against a clutch housing fixed pressure plate under tension of friction linings of a clutch disc for opening and Closing the friction clutch is axially displaceable, in which, depending on a change in a distance between the pressure plate and pressure plate a positive connection between a twisting device, which rotates a arranged between the pressure plate and the lever system ramp system to compensate for occurring during wear gap between the pressure plate and lever system, and a Control device which controls the rotation means by means of the positive locking takes place and the rotation means is rotated by means of the control device with opening friction clutch to a friction
  • A1 friction clutch is known at least consisting of a clutch housing with a rotatably and axially limited to this movable pressure plate, which is supported by a lever on the clutch housing lever system against a clutch housing fixed pressure plate under tension of friction linings of a clutch disc for opening and closing the friction clutch is axially displaceable, wherein during a stroke of the pressure plate in response to a change in a distance between the pressure plate and lever system, a pawl on a circumferential profile of a rotatably connected to an adjusting spindle sprocket and upon reaching a wear limit with the circumferential profile forms a positive connection and the pinion rotated during the next stroke, in addition to the pawl a form-fitting engaging in the circumferential profile of the pinion locking device is provided to the functionality w to improve self-adjusting friction clutches.
  • From DE 10 2010 052 391 A1 discloses a method for controlling a dual-clutch transmission in a motor vehicle with two by means of one of a clutch actuator actuated friction clutch with an internal combustion engine coupled sub-drive trains, wherein circuits between arranged on different sub-drive trains gears without interruption of traction by overlapping the on the are provided in a given operating situation depending on the mileage of at least one component of the dual clutch transmission exclusively a circuit of gears with traction interruption to propose a method for operating a dual clutch transmission, the predetermined hardware of the Doppelkupplungsgetriebes allows a higher number of load circuits without traction interruption.
  • the invention has for its object to improve a method mentioned above.
  • a power transmission capacity of the friction clutch device should be improved.
  • a coefficient of friction of a friction clutch should be increased.
  • a friction clutch device should be readjusted.
  • an exchange of a friction clutch device should be avoided.
  • costs should be reduced.
  • the object is achieved by a method for controlling a friction clutch device having at least one friction clutch and an adjusting device in order to improve a power transmission capacity of the friction clutch device, wherein the steps of operating the friction clutch device to effect an adjustment, and operating the friction clutch device to an energy input in to effect the at least one friction clutch.
  • the procedure can be carried out in a workshop.
  • the procedure can be carried out as part of a customer service.
  • the procedure can be performed due to an error message.
  • the method may be performed when a reduced power transmission capacity of the at least one friction clutch is detected.
  • the method can be carried out for a single clutch.
  • Method can be used for a doping Coupling be performed.
  • the method can only be carried out for a clutch of a double clutch.
  • the process can be carried out for both clutches of a double clutch.
  • the friction clutch device may comprise a single friction clutch.
  • the friction clutch device may have a single clutch.
  • the friction clutch device may have two friction clutches.
  • the friction clutch device may have a double clutch.
  • the friction clutch device can be arranged in a drive train of the
  • the drive train may include an internal combustion engine.
  • the drive train may have a transmission.
  • the friction clutch device may be arrangeable in the drive train between the engine and the transmission. Between the internal combustion engine and the friction clutch device, a torsional vibration damper can be arranged.
  • the friction clutch device may have an input part.
  • the friction coupling device may have at least one output part.
  • the friction coupling device may have a single output part.
  • the friction coupling device may have a first output part and a second output part.
  • the input part of the friction clutch device may be drive-connectable with an output shaft of the internal combustion engine.
  • the at least one output part of the friction clutch device can be drive-connected to an input shaft of the transmission.
  • the terms "input part” and "output part” refer to a power flow direction emanating from the internal combustion engine.
  • a friction clutch can, starting from a fully open actuation position, in which substantially no power transmission takes place between the input part and an output part, up to a fully closed actuation position, in which substantially complete power transmission takes place between the input part and an output part, increase depending on actuation Enable power transmission, wherein a power transmission between the input part and the output part is frictionally. Conversely, starting from a fully closed actuation position, in which substantially complete power transmission takes place between the input part and an output part, up to a fully open actuation position, in which substantially no power transmission occurs between the input part and an output part, a decreasing noise occurs depending on the actuation - enable transmission.
  • the friction coupling device can enable a power transmission between the input part and the first output part or the second output part in a transitional change.
  • the friction clutch device may have a single-plate clutch.
  • Friction clutch means may comprise a multi-plate clutch.
  • the friction clutch device may have a dry clutch.
  • the friction clutch device may have a wet clutch.
  • the friction clutch device may have a depressed clutch.
  • the friction clutch device may include a towed clutch.
  • the friction clutch device can be actuated automatically.
  • the friction clutch device may have a control device.
  • the control device can serve to control the friction clutch device.
  • the control device can serve to control a friction clutch.
  • the control device can serve for carrying out the method according to the invention.
  • the control device may have an electrical control unit.
  • the control device may have a computing device.
  • the control device may have a memory device.
  • a friction clutch may include a housing, a pressure plate, optionally at least one intermediate pressure plate, a pressure plate axially displaceable relative to the pressure plate, and at least one clutch disc.
  • the pressure plate, optionally the at least one intermediate pressure plate and the pressure plate may belong to the input part of a friction clutch.
  • the at least one clutch plate may belong to the output part of a friction clutch.
  • the at least one clutch disc is for non-positive, in particular frictional, power transmission between the pressure plate, optionally the at least one intermediate pressure plate and the pressure plate clamped. In a power transmission between the input part and the at least one output part of the friction clutch, a speed difference may occur between the input part and the at least one output part. Due to friction, heat can be generated from mechanical work.
  • the friction coupling device may have friction linings.
  • the friction linings can be arranged on the at least one clutch disc. During operation of the friction clutch device, the friction linings may be subject to wear.
  • the friction linings can have a lining thickness. Wear can reduce the thickness of the lining. gladly. At a reduced pad thickness, a further displacement of the pressure plate of a friction clutch may be required to cause pinching of the at least one clutch disc.
  • the adjusting device can be used to readjust the friction clutch device in order to compensate for wear, in particular of the friction linings.
  • the adjusting device can be effective between the housing and the pressure plate of a friction clutch. The adjusting device can effect readjustment upon engagement and / or disengagement of a friction clutch when wear exceeds a predetermined value.
  • the adjusting device may have a ramp device.
  • the ramp means may comprise housing-side ramps and pressure-plate-side ramps.
  • the adjusting device can be rotated for readjustment.
  • the adjusting device can have a twisting device.
  • the twisting device can serve to convert a linear input and / or disengagement movement into a twisting movement.
  • the twisting device may be effective when wear exceeds a predetermined value.
  • the twisting device may be ineffective at wear below a predetermined value.
  • a path area via which the pressure plate of a friction clutch is displaceable, can be displaced depending on the wear to the pressure plate.
  • the adjuster may enable a path-based wear adjustment.
  • the at least one friction clutch may be engaged and / or disengaged multiple times.
  • This input speed may be above about 3,000 rpm "1 , in particular above about 4,000 rpm " 1 , in particular above about 5,000 rpm "1. Due to the input rotational speed which is above a predetermined rotational speed value, vibrations may be excited,
  • the at least one friction clutch can be engaged and / or disengaged several times at least approximately completely.
  • the at least one friction clutch can be engaged and / or retracted several times at an input speed that is below a predetermined speed value and at a transmission ratio of a transmission that is switched into a power flow be disengaged.
  • This input rotational speed may be below about 1, 500 min -1 , in particular below about 1000 min -1 , in particular below about 800 min -1 , in which the first, third or fifth gear can be engaged
  • the second, fourth or sixth gear can be engaged in the transmission.
  • Engaging, holding in the engaged state for a predetermined time, disengaging and holding in the disengaged state for a predetermined time may be collectively referred to as a cycle.
  • the friction clutch may be in a disengaged state for about 6 seconds to about 10 seconds, especially about 8 seconds, in an engaged state, and about 2 seconds to about 6 seconds, especially about 4 seconds.
  • the friction clutch In the engaged state, the friction clutch may be partially engaged.
  • the friction clutch In the engaged state, the friction clutch can be engaged in such a way that a torque of about 10 Nm to about 50 Nm, in particular from about 20 Nm to about 40 Nm, in particular of about 30 Nm, Ü transmitted. Seven cycles can be summarized in a sequence. Four sequences can be performed. It can be performed 28 cycles. During operation of the friction clutch device to cause an energy input into the at least one friction clutch, a predetermined amount of energy can be entered.
  • An energy quantity of about 400 kJ to about 800 kJ, in particular of about 500 kJ to about 700 kJ, in particular of about 600 kJ, can be entered.
  • the amount of energy can be distributed over the cycles distributed.
  • a predetermined amount of energy can be entered.
  • the step of operating the friction clutch device to effect readjustment may be performed, subsequently the step of operating the friction clutch device to effect an energy input into the at least one friction clutch , and subsequently, with the temperature of the at least one friction clutch being increased thereby, the step of operating the friction clutch device to effect readjustment can be carried out again.
  • the initial step of operating the friction clutch device to effect readjustment may be performed at a temperature of the at least one friction clutch below 100 ° C, in particular below 80 ° C.
  • the process steps can be summarized in a service routine.
  • the invention thus provides, inter alia, a method for restoring a torque transmission capacity of a dry dual clutch device.
  • an initial adjustment procedure can be carried out: at high engine speed and when a clutch temperature is less than 80 ° C, a clutch can be actuated several times to provoke a potential readjustment. to be able to decorate.
  • an "energy entry process” can be performed: a total of 28 cycles of 20kJ energy input can be performed. A combustor can run at idle, a gear can be engaged (depending on the clutch), the Energyeintragsablauf can be torque controlled.
  • the "initial adjustment process can be repeated but in a hot state.
  • a power transmission capacity of the friction clutch device is improved.
  • a coefficient of friction of the friction clutch can be increased.
  • a friction clutch device can be adjusted.
  • An exchange of the friction clutch device can be avoided. Costs can be reduced.
  • the figure shows schematically and by way of example a diagram 100 for a method for controlling a clutch of a dual clutch of a motor vehicle.
  • the dual clutch is arranged in the drive train of a motor vehicle between an internal combustion engine and a transmission.
  • the double clutch has two clutches.
  • the double clutch has an input part.
  • the input part is drive-connected to the internal combustion engine.
  • the transmission has two input shafts.
  • the double clutch has two output parts. In each case an output part of the double clutch is drive-connected to an input shaft of the transmission.
  • the procedure is performed as part of a customer service to restore the power transmission capacity.
  • the method is performed, for example, due to an error message that signals a reduced power transmission capacity of a clutch.
  • the method is performed only for a clutch whose power transmission capacity is reduced.
  • a speed curve 102 of an internal combustion engine a speed curve 102 of an internal combustion engine
  • a time is plotted synchronously in the x-direction for all courses 102, 104, 106.
  • In the y-direction for the speed curve 102 is a speed, for the transmission torque curve 104 a moment and for the Aktuatorwegverlauf 106 a Aktuatorweg plotted.
  • the process comprises three phases 108, 110, 12.
  • the coupling Before starting the process, the coupling has a temperature which is below, for example, 80 ° C.
  • the internal combustion engine is operated at an internal combustion engine speed of, for example, approximately 5000 min -1
  • the clutch is repeatedly fully opened and closed
  • the complete path of closing and opening operations, such as 1 14, can be seen in the actuator travel path 106 No gear ratio is engaged in the gear train assigned to the clutch so that no torque is transmitted, thus assisting readjustment of an adjustment device of the clutch.
  • the internal combustion engine is operated at an internal combustion engine speed of, for example, approximately 800 min -1
  • the clutch is actuated several times in the closing direction, held in a partially closed position, opened and held in the open position in that a torque of, for example, 30 Nm is transmitted, resulting in heat resulting from mechanical work due to friction, which leads to heating of the clutch
  • the actuator travel path 106 shows the partial closing and opening operations, such as 1 16 For example, it closes for about 8 seconds and opens, for example, for about 4 seconds, with an energy input of, for example, about 20 kJ, a sequence that includes partial closing, holding in a partially closed position, opening and holding in the open position , is called cycle 1 18.
  • cycle 1 18 a sequence that includes partial closing, holding in a partially closed position, opening and holding in the open position
  • a sequence lasts for example about 84 s and the entire second phase 1 10 about 336 s.
  • the third phase 1 12 corresponds to the first phase 108 with the difference that the coupling at the beginning of the third phase 1 12 has an increased due to the energy input during the second phase 1 10 temperature.
  • the internal combustion engine is operated at an internal combustion engine speed of, for example, approximately 5000 min -1 .
  • the clutch is repeatedly fully opened and closed.
  • Course 106 the complete closing and opening operations, such as 120, can be seen.
  • no gear ratio is engaged so that no torque is transmitted. This adjustment of an adjustment of the clutch is supported.

Landscapes

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

Abstract

L'invention concerne un procédé de commande d'un dispositif à embrayages à friction comprenant au moins un embrayage à friction et un dispositif d'ajustement pour améliorer une capacité de transmission de puissance du dispositif à embrayages à friction. Le procédé comprend les étapes consistant à faire fonctionner le dispositif à embrayages à friction pour provoquer un ajustement, et à faire fonctionner le dispositif à embrayages à friction pour provoquer un apport d'énergie dans ledit au moins un embrayage à friction, aux fins d'amélioration du procédé.
PCT/DE2013/200170 2012-09-18 2013-09-11 Procédé de commande d'un dispositif à embrayages à friction WO2014044274A2 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE112013004536.2T DE112013004536A5 (de) 2012-09-18 2013-09-11 Verfahren zum Steuern einer Reibungskupplungseinrichtung
CN201380047311.7A CN104620009B (zh) 2012-09-18 2013-09-11 用于控制摩擦离合器装置的方法

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE102012216644 2012-09-18
DE102012216644.0 2012-09-18
DE102012221705.3 2012-11-28
DE102012221705 2012-11-28

Publications (2)

Publication Number Publication Date
WO2014044274A2 true WO2014044274A2 (fr) 2014-03-27
WO2014044274A3 WO2014044274A3 (fr) 2014-05-08

Family

ID=49585240

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2013/200170 WO2014044274A2 (fr) 2012-09-18 2013-09-11 Procédé de commande d'un dispositif à embrayages à friction

Country Status (3)

Country Link
CN (1) CN104620009B (fr)
DE (2) DE112013004536A5 (fr)
WO (1) WO2014044274A2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10895321B2 (en) * 2016-12-22 2021-01-19 Eaton Cummins Automated Transmission Technologies, Llc High efficiency, high output transmission

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009056092A1 (fr) 2007-10-31 2009-05-07 Luk Lamellen Und Kupplungsbau Beteiligungs Kg Embrayage à friction
DE102009035225A1 (de) 2008-08-21 2010-02-25 Luk Lamellen Und Kupplungsbau Beteiligungs Kg Reibungskupplung
DE102010052391A1 (de) 2009-12-03 2011-06-09 Schaeffler Technologies Gmbh & Co. Kg Verfahren zur Steuerung eines Doppelkupplungsgetriebes

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2859258B1 (fr) * 2003-08-29 2006-02-24 Renault Sa Procede pour selectioner une loi de commande du systeme de pilotage d'un embrayage en determinant trois points de fonctionnement
JP2007126040A (ja) * 2005-11-04 2007-05-24 Toyota Motor Corp 車両の制御装置
DE502007000306D1 (de) * 2006-02-16 2009-02-05 Luk Lamellen & Kupplungsbau Verfahren und Vorrichtung zum Nachstellen einer in einem Fahrzeugantriebsstrang befindlichen, von einem Aktor betätigten Reibungskupplung
DE102008042891A1 (de) * 2008-10-16 2010-04-22 Robert Bosch Gmbh Verfahren zur automatischen Tastpunktadaption

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009056092A1 (fr) 2007-10-31 2009-05-07 Luk Lamellen Und Kupplungsbau Beteiligungs Kg Embrayage à friction
DE102009035225A1 (de) 2008-08-21 2010-02-25 Luk Lamellen Und Kupplungsbau Beteiligungs Kg Reibungskupplung
DE102010052391A1 (de) 2009-12-03 2011-06-09 Schaeffler Technologies Gmbh & Co. Kg Verfahren zur Steuerung eines Doppelkupplungsgetriebes

Also Published As

Publication number Publication date
WO2014044274A3 (fr) 2014-05-08
DE112013004536A5 (de) 2015-05-28
DE102013218113A1 (de) 2014-03-20
CN104620009A (zh) 2015-05-13
CN104620009B (zh) 2017-03-08

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