WO2019013686A1 - Procédé et dispositif d'estimation d'une fuite d'une pompe - Google Patents

Procédé et dispositif d'estimation d'une fuite d'une pompe Download PDF

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Publication number
WO2019013686A1
WO2019013686A1 PCT/SE2018/050717 SE2018050717W WO2019013686A1 WO 2019013686 A1 WO2019013686 A1 WO 2019013686A1 SE 2018050717 W SE2018050717 W SE 2018050717W WO 2019013686 A1 WO2019013686 A1 WO 2019013686A1
Authority
WO
WIPO (PCT)
Prior art keywords
pump
pressure
leakage
vehicle
value
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.)
Ceased
Application number
PCT/SE2018/050717
Other languages
English (en)
Inventor
Kurt KÄLLKVIST
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.)
Scania CV AB
Original Assignee
Scania CV AB
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 Scania CV AB filed Critical Scania CV AB
Publication of WO2019013686A1 publication Critical patent/WO2019013686A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B51/00—Testing machines, pumps, or pumping installations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/06—Control using electricity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/04—Feeding by means of driven pumps
    • F02M37/041—Arrangements for driving gear-type pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/04—Feeding by means of driven pumps
    • F02M37/043—Arrangements for driving reciprocating piston-type pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/06—Control using electricity
    • F04B49/065—Control using electricity and making use of computers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/08—Regulating by delivery pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/10—Other safety measures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1433—Pumps
    • F01N2610/144—Control thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion
    • F01N3/206—Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2201/00—Pump parameters
    • F04B2201/02—Piston parameters
    • F04B2201/0208—Leakage across the piston
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2205/00—Fluid parameters
    • F04B2205/03—Pressure in the compression chamber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2205/00—Fluid parameters
    • F04B2205/05—Pressure after the pump outlet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/10—Other safety measures
    • F04B49/106—Responsive to pumped volume
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Definitions

  • the present invention relates to a method for providing an estimated value of a possible leakage on a suction side of a piston displacement pu mp pumping a liquid, i n which the method comprises the step of driving the pump and measuring the outlet pressure of the pump, as well as a device according to the preamble of the appended independent device claim .
  • the i nvention relates to such a method for any conceivable use of such a piston displacement pump, but for i llumi nating the invention and the problems to be addressed thereby the use of such a piston displacement pu mp in a motor veh icle for feeding liquid, such as Ad blue or fuel , will hereinafter be discussed without restricti ng the present invention to that application .
  • SE 1 350438 discloses a method of the type defined in the introduction i n which the pressu re in a position downstreams the pump is measured and the pump is then switched off and the pressure decrease in said position is measu red and compared with values of such a pressure decrease stored so as to determine whether a leakage is located in the line upstreams or downstreams the pump.
  • th is method may not be carried out during normal operation of the pu mp and it is not su ited for estimating a value of a possible leakage on the suction side of the pump but only to determine whether a leakage is located on the suction side or the exhaust side of the pump.
  • the object of the present invention is to provide a method and a device of the type defined in the introduction being i mproved in at least some aspect with respect to such methods and devices already known .
  • This object is with respect to the method obtained by providing such a method with the features listed in the characterizing part of appended patent clai m 1 .
  • the invention is based on the understanding that the geometric compression ratio known for a piston displacement pump may be used i n combination with the value of the maximum attainable outlet pressure of the pu mp measured for providing an estimated val ue of a possible leakage on a suction side of the pump.
  • Th is may be achieved by assu ming that the gas temperature is constant allowing the general gas law to be used for calculating the ratio of air vol ume to pressure chamber volu me of the pu mp at the bottom dead point of the piston .
  • the val ue of the air volu me ratio so calculated is then compared with a characteristic value thereof for the pu mp without leakage on the suction side thereof enabli ng determi ning of an esti mated value of a possible leakage on the suction side of the pu mp throug h the result of this comparison .
  • a sensor measu ring the outlet pressure of the pump is in most systems including such a pump already there, and the steps b)-d) of the method may be carried out by an electronic control unit already present, such as for the control of components in a veh icle.
  • an electronic control unit already present such as for the control of components in a veh icle.
  • the maximu m attainable outlet pressure may either be actively achieved by driving the pump at a maxi mum in the case th is pressure is h igher than the normal operation pressure of the system or under normal operation of the pu mp in case the maxim um attainable pressu re in fact is lower than the normal operation pressure and the pu mp works at a maxi mum for trying to reach the normal operation pressure.
  • a knowledge of the flow rate of the pump is utilized i n the determi ning step d) to determine said estimated value of a possible leakage as an air leakage flow rate.
  • This determi nation may form the basis for a decision whether any measure is to be taken for stopping the leakage.
  • the method is carried out for a pu mp i n a low pressure part of a system for feedi ng liquid in a motor veh icle.
  • Low pressure does here normally mean a pressure in the region of 5-30 bars, and a piston displacement pump is suitable to be used in such a low pressu re part of a system for feeding liqu id in a motor veh icle and it wi ll be crucial for the operation of the vehicle to detect and provide an estimated value of a possible leakage on the suction side of such a pump.
  • the method is carried out for a piston displacement pump connected between a tank of Ad bl ue to pump Ad blue to be downstreams of the pump sprayed into the exhaust gas system of the vehicle upstreams the catalytic converter thereof.
  • a piston displacement pu mp there is already a pressure sensor arranged downstreams the pu mp for measuring the pressure of Ad bl ue to be sprayed into the exhaust gas system , so that no extra sensor is needed for carrying out the method accordi ng to the present invention .
  • the method is carried out for a piston displacement pump connected to a fuel tank of the vehicle to pu mp fuel towards a hig h pressure part of a system for i njection of fuel into an internal combustion engine of the vehicle.
  • a piston displacement pump connected to a fuel tank of the vehicle to pu mp fuel towards a hig h pressure part of a system for i njection of fuel into an internal combustion engine of the vehicle.
  • the object of the present i nvention is with respect to the device obtai ned by providing a device with the features listed in the appended independent device claim .
  • the advantages of such a device and the embodiments thereof defined in the dependent device clai ms appear clearly from the above discussion of the method according to the i nvention .
  • the i nvention also relates to a computer program , a computer- readable medium , an electronic control unit and a motor veh icle according to the appended clai ms directed thereto.
  • Fig.3 is a graph of the maximum attainable outlet pressure P of a piston displacement pump versus ratio of air volume to pressure chamber volume of the pump at the bottom dead point of the piston of the pump,
  • Fig.4 is a flow chart illustrating the steps carried out in a method according to an embodiment of the invention.
  • Fig.5 is a schematic view illustrating an electronic control unit for implementing a method according to the invention.
  • FIG. 1 A method and a device according to an embodiment of the invention will now be described while making reference to Figs. 1- 3. It is very simplifiedly shown in Fig. 1 how a piston displacement pump 1 is arranged to feed Ad blue from a tank 2 of Ad blue to a nozzle 3 spraying Ad blue into a pipe 4 of the exhaust gas system 5 of a vehicle 6 at the location between an internal combustion engine 7 and a catalytic converter 8 of the exhaust gas system.
  • a member 9 configured to measure the outlet pressure of the pump in operation thereof in the form of a pressure sensor is arranged in the line 10 from the tank 2 to the nozzle 3 downstreams the pump 1. This pressure measuring member 9 is there for checking that the liquid pressure at the nozzle 3 is as desired.
  • the pressure sensor sends during normal operation of the pump 1 pressure values so measured to a first unit 11 configured to calculate the ratio of air volume to pressure chamber volume of the pump at the bottom dead point of the piston. How this will be done will now be explained while making reference to Figs.2 and 3.
  • the bottom dead point of the piston 12 is indicated at 13 in Fig.2 defining the maximum pressure chamber volume V ma x of the pump, whereas 14 indicates the upper dead point of the piston defining the minimum pressure chamber volume V m in of the pump.
  • the geometric compression ratio r geo of the pump is Vmax Vmin and is known by the unit 11. Assuming that both the pump chamber and the liquid 15 inside it are incompressible, as soon as the pump chamber volume decreases below the liquid volume, liquid will be expelled from the pump. If an elastic element, for example a gas, is present in the pump chamber, that elastic element will have to be compressed enough to generate sufficient pressure to overcome the back pressure at the outlet of the pump before any liquid can be expelled.
  • the ideal or general gas law can be used along with a known geometric compression ratio to determine the amount of gas in the chamber at maximum chamber volume if the maximum attainable outlet pressure of the pump is known. It is then assumed that the gas temperature is constant. Said maximum attainable pressure at the outlet of the pump is for a pump with a given geometric compression ratio a function of the ratio of gas, here air, volume to the total chamber volume V ma x and this is for a certain pump shown by the graph in Fig. 3.
  • a second unit 16 of the device according to the invention is configured to compare the value of the air volume ratio calculated by the first unit and shown in Fig. 3 with a characteristic value thereof for the pump without leakage on the suction side thereof and to determine an estimated value of a possible leakage on the suction side of the pump through the result of this comparison. Accordingly, no extra hardware, such as sensors, or invasive measure, such as by blocking/disconnecting components, is required for providing an estimated value of a possible leakage on the suction side of the pump. The method simply relies on getting the opportunity to measure the maximum obtainable pressure on the outlet side of the pump, where pressure might already be measured for control purposes.
  • Fig. 4 illustrates a flow chart of a method according to an embodiment of the present invention carried out for a liquid feeding system of the type shown in Fig. 1.
  • the method is started with the step Si of continuing to drive the pump. While driving the pump the maximum attainable pump outlet pressure is measured in a step S2, whereupon in a step S3 the general gas law and a knowledge of geometric compression ratio of the pump is utilized to calculate the ratio of air volume to pressure chamber volume. Then the value calculated is in a step S 4 compared with a characteristic value for the pump without leakage, and finally and estimated value of a possible leakage on the pump suction side is in a step S5 determined based on the comparison.
  • Computer program code for implementing a method according to the invention is with advantage included in a computer program which can be read into the internal memory of a computer, e.g. the internal memory of an electronic control unit of a motor vehicle.
  • a computer program is with advantage provided via a computer program product comprising a data storage medium which can be read by a computer and which has the computer program stored on it.
  • Said data storage medium is for example an optical data storage medium in the form of a CD ROM disc, a DVD disc etc., a magnetic data storage medium in the form of a hard disc, a diskette, a cassette tape etc., or a flash memory or a memory of the ROM, PROM, EPROM or EEPROM type.
  • FIG. 5 illustrates very schematically an electronic control unit 17 comprising an execution means 18, e.g. a central processor unit (CPU), for execution of computer software.
  • the execution means 18 communicates with a memory 19, e.g. of the RAM type, via a data bus 20.
  • the control unit 17 comprises also a non-transitory data storage medium 21, e.g. in the form of a flash memory or a memory of the ROM, PROM, EPROM or EEPROM type.
  • the execution means 18 communicates with the data storage medium 21 via the data bus 20.
  • a computer program comprising computer program code for implementing a method accordi ng to the invention , e.g . in accordance with the embodiment ill ustrated in Fig . 3, is stored on the data storage medium 21 .
  • the fi rst and second u nits may of course be combined in one single member, such as the ECU of a vehicle.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Computer Hardware Design (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Examining Or Testing Airtightness (AREA)

Abstract

Dans un procédé destiné à fournir une valeur estimée d'une éventuelle fuite côté aspiration d'une pompe à déplacement de piston (1) pompant un liquide, la pression de sortie maximale pouvant être atteinte de la pompe est mesurée tout en entraînant la pompe. Le rapport du volume d'air au volume de la chambre de pression de la pompe au point mort bas du piston est ensuite calculé à l'aide de la valeur de pression mesurée dans la loi des gaz générale tout en supposant que la température du gaz est constante et en utilisant la connaissance du rapport de compression géométrique de la pompe. La valeur calculée est comparée à la valeur caractéristique du rapport de volume d'air de la pompe sans fuite pour déterminer une valeur estimée d'une éventuelle fuite.
PCT/SE2018/050717 2017-07-11 2018-07-02 Procédé et dispositif d'estimation d'une fuite d'une pompe Ceased WO2019013686A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE1750910-0 2017-07-11
SE1750910A SE541189C2 (en) 2017-07-11 2017-07-11 A method and a device for estimating a leakage on a suction side of a pump

Publications (1)

Publication Number Publication Date
WO2019013686A1 true WO2019013686A1 (fr) 2019-01-17

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2018/050717 Ceased WO2019013686A1 (fr) 2017-07-11 2018-07-02 Procédé et dispositif d'estimation d'une fuite d'une pompe

Country Status (2)

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SE (1) SE541189C2 (fr)
WO (1) WO2019013686A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19919572A1 (de) * 1999-04-29 2000-11-30 Fresenius Medical Care De Gmbh Verfahren und Vorrichtung zur Bestimmung von Gas in medizinischen Flüssigkeiten
WO2011104545A2 (fr) * 2010-02-23 2011-09-01 Artemis Intelligent Power Limited Procédé de mesure d'une propriété d'un gaz entraîné dans un liquide hydraulique et machine à action de fluide
WO2013028542A2 (fr) * 2011-08-19 2013-02-28 Entegris, Inc. Système et procédé pour détecter la présence d'air dans un fluide
DE102011115244A1 (de) * 2011-09-28 2013-03-28 Airbus Operations Gmbh Verfahren und System zur Überwachung des Betriebszustands einer Pumpe
SE1350438A1 (sv) * 2013-04-09 2014-10-10 Scania Cv Ab Anordning för bränslematning samt förfarande i samband därmed
US9546652B2 (en) * 2012-03-28 2017-01-17 Imo Industries, Inc. System and method for monitoring and control of cavitation in positive displacement pumps

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19919572A1 (de) * 1999-04-29 2000-11-30 Fresenius Medical Care De Gmbh Verfahren und Vorrichtung zur Bestimmung von Gas in medizinischen Flüssigkeiten
WO2011104545A2 (fr) * 2010-02-23 2011-09-01 Artemis Intelligent Power Limited Procédé de mesure d'une propriété d'un gaz entraîné dans un liquide hydraulique et machine à action de fluide
WO2013028542A2 (fr) * 2011-08-19 2013-02-28 Entegris, Inc. Système et procédé pour détecter la présence d'air dans un fluide
DE102011115244A1 (de) * 2011-09-28 2013-03-28 Airbus Operations Gmbh Verfahren und System zur Überwachung des Betriebszustands einer Pumpe
US9546652B2 (en) * 2012-03-28 2017-01-17 Imo Industries, Inc. System and method for monitoring and control of cavitation in positive displacement pumps
SE1350438A1 (sv) * 2013-04-09 2014-10-10 Scania Cv Ab Anordning för bränslematning samt förfarande i samband därmed

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Publication number Publication date
SE1750910A1 (en) 2019-01-12
SE541189C2 (en) 2019-04-23

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