WO2020119547A1 - Automobile capable de réaliser rapidement un freinage de service ou un freinage d'urgence à la main et procédé de fonctionnement - Google Patents

Automobile capable de réaliser rapidement un freinage de service ou un freinage d'urgence à la main et procédé de fonctionnement Download PDF

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Publication number
WO2020119547A1
WO2020119547A1 PCT/CN2019/122986 CN2019122986W WO2020119547A1 WO 2020119547 A1 WO2020119547 A1 WO 2020119547A1 CN 2019122986 W CN2019122986 W CN 2019122986W WO 2020119547 A1 WO2020119547 A1 WO 2020119547A1
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WO
WIPO (PCT)
Prior art keywords
braking
brake
emergency
hand
handle
Prior art date
Application number
PCT/CN2019/122986
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English (en)
Chinese (zh)
Inventor
曹显亮
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曹显亮
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Filing date
Publication date
Application filed by 曹显亮 filed Critical 曹显亮
Publication of WO2020119547A1 publication Critical patent/WO2020119547A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T7/00—Brake-action initiating means
    • B60T7/02—Brake-action initiating means for personal initiation
    • B60T7/04—Brake-action initiating means for personal initiation foot actuated
    • B60T7/042—Brake-action initiating means for personal initiation foot actuated by electrical means, e.g. using travel or force sensors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K23/00—Arrangement or mounting of control devices for vehicle transmissions, or parts thereof, not otherwise provided for
    • B60K23/02—Arrangement or mounting of control devices for vehicle transmissions, or parts thereof, not otherwise provided for for main transmission clutches
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/66—Electrical control in fluid-pressure brake systems
    • B60T13/68—Electrical control in fluid-pressure brake systems by electrically-controlled valves
    • B60T13/683—Electrical control in fluid-pressure brake systems by electrically-controlled valves in pneumatic systems or parts thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T7/00—Brake-action initiating means
    • B60T7/02—Brake-action initiating means for personal initiation
    • B60T7/04—Brake-action initiating means for personal initiation foot actuated
    • B60T7/06—Disposition of pedal

Definitions

  • the invention relates to an automobile braking system, in particular to an automobile and an operation method which can quickly implement service braking or emergency braking by hand.
  • Existing cars can use the foot to operate the brake pedal to implement the service brake or emergency brake for the car, there is no other operating mechanism that can operate the brake mechanism to implement the service brake or emergency brake for the car.
  • Some high-end cars Even if another braking system or operating mechanism is additionally provided, it cannot casually implement emergency braking to the car, and the general is also emergency braking, which may be due to misoperation.
  • Some cars are equipped with a parking brake handle to implement an emergency control system for the car, but in order to avoid misoperation, to operate the car to implement emergency braking, it is necessary to press the parking brake button switch for a few seconds. Whether to start braking or emergency braking. If there is an emergency, you must want to implement emergency braking. You want the car to stop as soon as possible.
  • the purpose of the present invention is to overcome the shortcomings of the prior art, and to provide a vehicle and an operating method that can quickly implement service braking or emergency braking by hand.
  • a vehicle capable of quickly implementing service braking or emergency braking by hand includes an engine, a chassis, a body, electrical equipment, an electronic service braking or emergency braking system, an electronic parking brake system, and a speed sensor; It also includes a parking brake handle that can quickly implement service braking or emergency braking, a position switch that implements a brake frequency detection mechanism is installed below it, and can detect the number and frequency of braking actions performed by the parking brake handle,
  • the implementation braking frequency detection mechanism and the implementation braking frequency detection mechanism include a chip, a position switch or a photoelectric counter.
  • the above-mentioned car that can quickly implement the service brake or emergency brake by hand.
  • the operation method of quickly implementing the service brake or emergency brake by hand is: before applying the service brake or emergency brake to the car with the parking brake handle , First of all, the parking brake handle must be operated. Between the area where the brake is released and the area where the brake is applied, the reciprocating motion should be repeated two or more times per second, and the reciprocating motion should be repeated twice or two consecutively. After more than one time, apply braking force to the brake system, or stop the parking brake handle at the position of the brake area, or according to the needs of the situation, after a pause at the position of the brake area, The frequency can be reduced to continue the stop-and-go movement, to achieve multiple point brakes to prevent rear-end accidents.
  • FIG. 1 is a schematic diagram of the structure of the parking brake handle of the present invention to the position where the brake is released.
  • FIG. 2 is a schematic diagram of the structure of the parking brake handle of the present invention to the position where the brake is implemented.
  • FIG. 3 is a schematic diagram of the structure of the brake frequency detection system of the present invention when the cylinders are divided to completely release the brake state.
  • FIG. 4 is a schematic diagram of the state structure of the implementation of the braking frequency detection system of the present invention when the parking brake handle is pulled once to the braking position.
  • FIG. 5 is a schematic diagram of the state structure of the instant state in which the brake frequency detection system of the present invention pulls the parking brake handle from the brake release position to the brake implementation position for the second time within one second.
  • FIG. 6 is a schematic diagram of the state structure of the instant state in which the brake frequency detection system of the present invention pulls the parking brake handle from the brake release position to the brake implementation position for the third time within one second.
  • FIG. 7 is a schematic diagram of the structure of the electronic emergency brake switch of the present invention to the state where the electronic emergency brake is released.
  • FIG. 8 is a schematic diagram of the structure of the electronic emergency brake switch of the present invention to the state of implementing the electronic emergency braking.
  • FIG. 9 is a schematic diagram of the structure of the electronic parking brake switch of the present invention.
  • 1 parking brake handle 1.1 permanent magnet, 1.2 current-limiting adjustable valve, 1.3 current-limiting valve control lever, 1.31 current-limiting valve control moving contact, 1.4 frequency detection system driving lever
  • Operating frequency detection system is the main cylinder, 2.1 piston and piston rod, 2.2 piston return spring, 2.3 piston limit nut, 2.4 piston connecting rod, 2.5 intake check valve, 2.6 exhaust check valve, 2.7 main sub-cylinder air connection Pipe, 2.8 exhaust pipe, 3 operating frequency detection system sub-cylinder, 3.01 operating frequency detection system sub-cylinder control of moving and closing contacts, 3.1 sub-cylinder piston and piston rod, 3.2 sub-cylinder piston return spring, 3.3 contact movable rod , 3.4 air supply port, 3.5 contact telescopic spring, 3.9 piston height-limiting exhaust hole, 4 speed sensor, 4.01 speed sensor dynamic closing contact, 4.02 speed sensor normally closed dynamic breaking contact, 5 electronic emergency system Dynamic switch, 5.1 switch control lever, 5.2 switch control lever return spring, 5.3 solenoid coil, 5.4 return limit mechanism, 6 electronic parking brake switch, 6.1
  • the parking brake handle of the present invention can quickly implement a driving or emergency braking vehicle and an operating method, which includes an engine, a chassis, a body, electrical equipment, a speed sensor, an electronic service brake system, and an electronic parking brake system , Also includes a parking brake handle that can quickly implement service braking or emergency braking, a brake action frequency detection mechanism, and an operation method for the parking brake handle to quickly implement service braking or emergency braking, the operation method Yes: Before using the parking brake handle to apply the service brake or emergency brake to the car, the parking brake handle must be operated first, and the reciprocating movement must be repeated every second between the brake release position and the brake position.
  • this operation method it is also equipped with a magnet 1.1 provided on the parking brake handle; driven by the magnet 1.1, the frequency detection system drives the lever 1.4; driven by the frequency detection system drives the lever 1.4, operates Frequency detection system master cylinder 2; driven by operation frequency detection system master cylinder 2, operation frequency detection system sub-cylinder 3; sub-cylinder exhaust throttle valve and switch box 1.2 controlled by parking brake handle 1; set at Speed sensor 4 above the wheel; can be controlled by the operating posture of the parking brake handle and the speed of the speed sensor 4, electronic emergency brake switch 5; controlled by the parking brake handle and the speed sensor 4 , Electronic parking brake switch 6; controlled by the parking brake handle and speed sensor 4, relay 7; battery 9.
  • the implementation of the braking frequency detection system master cylinder 2 includes: a piston and a piston rod 2.1 that are connected to the frequency detection system driving lever 1.4 through the piston connecting rod 2.4; and the piston is returned to provide power for the frequency detection system master cylinder 2 intake air Spring 2.2; piston limit nut 2.3 for limiting the intake air volume of the master cylinder 2 for the frequency detection system; intake check valve 2.5, outlet check valve 2.6, master cylinder sub-cylinder air connection pipe 2.7.
  • the implementation of the braking frequency detection system of the sub-cylinder 3 includes: wherein the limited-flow adjustable valve 1.2 is provided, the exhaust pipe 2.8; is controlled by the sub-cylinder piston and the piston rod 3.1, and the operating frequency detection system is the dynamic coupling of the sub-cylinder control Contact 3.01; the cylinder can return the gas to the outside of the cylinder, the piston return spring 3.2 of the cylinder; the movable rod of the contact 3.3; the 2.7 connected to the main cylinder air connection pipe, the intake pipe 3.4; and the main Exhaust pipe 2.8 with cylinder sub-cylinder gas connection connecting pipe 2.7; contact telescopic spring 3.5; where the piston travel distance is limited, the piston height-limiting exhaust hole 3.9.
  • the speed sensor 4 includes: a speed sensor moving contact 4.01, a speed sensor normally closed and a moving contact 4.02, when the vehicle speed exceeds 6Km/h, the speed sensor moving contact 4.01 will remain closed In the state, when the vehicle speed is less than 6Km/h, the moving contact 4.01 of the speed sensor will remain open.
  • the normally closing moving contact 4.02 of the speed sensor and the moving contact 4.01 of the speed sensor are always In a reverse state, it must wait for the other party to break before it begins to close.
  • the electronic emergency brake switch 5 includes: operated by the solenoid coil 5.3, the switch control lever 5.1; after the solenoid coil 5.3 is powered off, the switch control lever 5.1 can be returned to the deactivation position, the switch control lever returns Position spring 5.2; when it is energized, it can attract the switch control lever 5.1 to the electronic emergency braking position, the solenoid coil 5.3; after the solenoid coil 5.3 is powered off, the switch control lever 5.1 is blocked until the electronic emergency control is released In the moving position, the return restriction mechanism 5.4.
  • the switch control lever 5.1 of the electronic emergency brake switch 5 can be understood as a brake pedal in an air-pressure brake car. When the foot is not loose, the emergency brake is applied to the car, and the foot is used according to the needs of the car. Loosen it for a short time, or loosen it frequently, which is to apply the normal service brake to the car.
  • the electronic service brake or emergency brake system can also be understood as the air pump and the air reservoir in a pneumatic brake car. If the present invention is equipped on a pneumatic brake car, the electronic service brake or Emergency braking system: it can be eliminated.
  • the electronic parking brake switch 6 includes: a parking brake handle 1 controlled by a switch drive motor 6.1; a circuit that can switch off the switch drive motor 6.1 when it is turned on or off, the parking brake switch Control lever 6.2; implement parking brake limit switch 6.3; limit switch dynamic break contact 6.31; release parking brake limit switch 6.4; release parking brake limit switch move break contact 6.41.
  • the relay 7 includes: a first normally-opening and closing contact 7.1; a second normally-opening and closing contact 7.2; a first normally-closing and breaking contact 7.3; a second normally-closing and breaking contact 7.4.
  • the operation frequency detection system sub-cylinder 3 works as follows: when the operation frequency detection system master cylinder 2 presses it for the first time with 100 ml of gas, the sub-cylinder piston and the piston rod 3.1 must be directed to the operation frequency detection system The moving and closing contacts controlled by the sub-cylinder move 10 mm in the direction of 3.01, and at the same time, the contact movable rod 3.3 is pushed to move in the same direction by 10 mm.
  • the moving distance is only set at 19 mm.
  • the operation frequency detection system master cylinder 2 gives the operation frequency detection system sub-cylinder 3 over-pressurized gas, which will be discharged from the piston height-limiting exhaust hole 3.9, so the parking brake handle 1 can be repeatedly pulled up as many times as possible, without any impact on the safety and effectiveness of the present invention; after the parking brake handle 1 is repeatedly pulled up three times as described above, the contact movable lever 3.3 and the operating frequency detection system are controlled by separate cylinders
  • the moving contact 3.01 is closed (actually, at two and a half times, the moving contact 3.01 is already closed), which means that the moving frequency contact 3.01 closed by the operating frequency detection system is closed; at this time, if
  • the parking brake handle 1 is in the braking position, that is, the movable contact 1.31 controlled by the restrictor valve is closed; at this time, the driving speed of the car also exceeds 6Km/h, which is the movable contact of the speed sensor 4.01 is in a closed state, and the speed sensor is normally closed.
  • the dynamic breaking contact 4.02 is in an open state, so the control current will be from one pole of the battery 9 and the dynamic closing contact 1.31 (current limiting valve) controlled by the current limiting valve
  • the controlled moving contact 1.31 is controlled by the parking brake handle 1.
  • the moving contact 1.31 controlled by the restrictor valve is closed, when the parking brake
  • the movable closing contact 1.31 controlled by the restrictor valve is in the off state,), then through the rotating contact 4.01 of the speed sensor, and then by the operating frequency detection system.
  • the first speed must exceed 6Km/h, and the second must be repeated twice per second before emergency braking begins.
  • the operating frequency of two or more times can be achieved within 1.5 seconds after continuously repeating the braking twice or more, and stopping the parking brake handle to the braking position within 1.5 seconds;
  • the operating frequency detection system is divided into the cylinder piston and the piston rod 3.1 of the cylinder 3, under the force of the cylinder piston return spring 3.2, if the parking brake handle stops in the state of releasing the brake, it returns every second
  • the downward distance is set to about 9 mm. If the parking brake handle is stopped at the brake position, the downward distance per second is set to about 1 mm.
  • the above working process is like this: when the parking brake handle 1 is pushed down to the end, the other end of the parking brake handle will move upward, and the restrictor valve lever 1.3 will be released to allow the current limit
  • the valve 1.2 fully opens the airway valve it controls (in this state, the cylinder piston and the piston rod 3.1, under the force of the cylinder piston return spring 3.2, the return downward distance per second is about 9 mm), Let the sub-cylinder piston and the piston rod 3.1 return to the end in about two to three seconds under the action of the sub-cylinder return spring 3.2; and make the movable contact 1.31 controlled by the restrictor valve open, resulting in
  • the relay coil of relay 7 is de-energized, causing both the first normally open and closed contact 7.1 and the relay second normally open and closed contact 7.2 to be disconnected, when the first normally open and closed contact 7.1 and the second normally open and closed contact 7.2 After both are disconnected, naturally the relay's first normally closed dynamic break contact 7.3 and the relay's second normally closed dynamic break contact 7.4 will be
  • the parking brake switch lever 6.2 forces the parking brake limit switch 6.4 to be released, After the release of the parking brake limit switch 6.41, the open contact, the switch drive motor 6.1 stops rotating, and the parking brake switch control lever 6.2 stops here.
  • the parking brake handle does not need to be provided with a locking mechanism and a ratchet pawl, as long as the operation lever is clamped a little, it is necessary to operate the shake It requires at least 2-3 kg of force; if it is combined with a man-machine parking brake system, the parking brake handle must be equipped with a locking mechanism, electronic parking (Brake switch 6 is not necessary);
  • the implementation braking frequency detection mechanism may be mechanical, electronic, or a combination of mechanical and electronic, such as a position switch and a delay electronic component and a relay connected and controlled Implement a braking frequency detection mechanism; as long as the driver operates the parking brake handle, from the position where the brake is released to the position where the brake is applied, the operation is repeated twice or more per second Frequency, after running back and forth two or more times (or three or more times), it will send a message to brake the car (it can also be understood to supply power to the relay coil), when the parking brake handle is released After the position of the braking area is more than 1 second or more than 1.5 seconds, it sends another message (a message that does not apply braking to the car.
  • the relay coil is not powered) and repeats the previous operation.
  • the data record is cleared. From the cleared state, the driver operates the parking brake handle, from the position where the brake is released to the position where the brake is applied, with a frequency of repetitive operation less than 1.5 times back and forth per second, When engaging in a back-and-forth action, the driver is not recognized to operate the parking brake lever. The number of times that the back-and-forth action is the same is (information that the car is not braked)
  • the implementation of the braking frequency detection mechanism is composed of a chip and a position switch or a photoelectric counter, which is relatively easy to install, the function can be set more accurately, and the price is cheaper;
  • the configuration of the present invention in a pneumatic brake car is only about a thousand yuan in cost. As long as the valve controlled by the brake pedal is connected in parallel with a valve controlled by hand, and an anti-misoperation of the present invention is configured The system will do.
  • the present invention can also specifically set a handle to operate the car to implement the service brake or emergency brake, so that the driver will not be too panicked when the accelerator pedal is stepped wrongly, because the driver thinks that the foot stepped on the wrong pedal, foot You don’t have to step on the brake pedal, you can apply emergency braking to the car by hand, so you don’t panic.

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Braking Elements And Transmission Devices (AREA)
  • Regulating Braking Force (AREA)

Abstract

La présente invention concerne une automobile capable de réaliser rapidement un freinage de service ou un freinage d'urgence à la main, comprenant un moteur, un châssis, une carrosserie, un système de freinage d'urgence électronique, un système de frein de stationnement électronique, un mécanisme de détection de fréquence, un capteur de vitesse de rotation (4) et une poignée de frein de stationnement (1). Un procédé de fonctionnement permettant de réaliser rapidement et en toute sécurité un freinage d'urgence à l'aide d'une poignée de frein de stationnement comprend les étapes consistant à : avant que le freinage d'urgence d'une automobile soit effectué en utilisant la poignée de frein de stationnement (1), actionner la poignée de frein de stationnement (1) pour effectuer en continu un mouvement de va-et-vient deux fois ou plus entre une position de relâchement de frein et une position de mise en œuvre de frein de ladite poignée à une fréquence de répétition du mouvement de va-et-vient deux fois ou plus par seconde, puis arrêter la poignée de frein de stationnement (1) au niveau de la position de serrage de frein. Lorsqu'une urgence intervient, si une pédale d'accélérateur est enfoncée par erreur, au moyen d'une opération réalisée en temps voulu à la main, une automobile se déplaçant rapidement peut également être freinée pour s'arrêter.
PCT/CN2019/122986 2018-12-09 2019-12-04 Automobile capable de réaliser rapidement un freinage de service ou un freinage d'urgence à la main et procédé de fonctionnement WO2020119547A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CN201811499478.8 2018-12-09
CN201811499478.8A CN109334637A (zh) 2018-12-09 2018-12-09 制动踏板左边设有副制动踏板的汽车及副制动操作方法
CN201911197345.XA CN110712632A (zh) 2018-12-09 2019-11-29 用手能快速实施行车制动或紧急制动的汽车及操作方法
CN201911197345.X 2019-11-29

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WO2020119547A1 true WO2020119547A1 (fr) 2020-06-18

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PCT/CN2019/122986 WO2020119547A1 (fr) 2018-12-09 2019-12-04 Automobile capable de réaliser rapidement un freinage de service ou un freinage d'urgence à la main et procédé de fonctionnement

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WO (1) WO2020119547A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109334637A (zh) * 2018-12-09 2019-02-15 曹显亮 制动踏板左边设有副制动踏板的汽车及副制动操作方法
CN114954379A (zh) * 2021-02-23 2022-08-30 曹显亮 将制动装置操作到自动实施制动状态的操作方法及其装置

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DE10140187A1 (de) * 2001-08-22 2003-03-20 Hinrich H Swyter Handbediengerät
CN102490705A (zh) * 2011-12-15 2012-06-13 奇瑞汽车股份有限公司 一种电子机械制动系统以及采用所述制动系统的汽车
CN104626983A (zh) * 2014-03-16 2015-05-20 易莹 安全型汽车
EP2915689A1 (fr) * 2014-03-03 2015-09-09 Peter Short Commande à pédale
CN207931694U (zh) * 2018-02-11 2018-10-02 上汽通用五菱汽车股份有限公司 一种电子手刹的应急驻车系统
CN109305149A (zh) * 2018-10-24 2019-02-05 浙江零跑科技有限公司 一种用于电动汽车的附加制动装置
CN109334637A (zh) * 2018-12-09 2019-02-15 曹显亮 制动踏板左边设有副制动踏板的汽车及副制动操作方法

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CN101863269A (zh) * 2010-06-18 2010-10-20 奇瑞汽车股份有限公司 电子制动踏板
WO2015160265A1 (fr) * 2014-04-14 2015-10-22 Transport Wholesale Limited Système de frein à actionnement d'urgence
CN104494583B (zh) * 2015-01-15 2017-09-22 南通力联自动化科技有限公司 一种辅助应急制动装置

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Publication number Priority date Publication date Assignee Title
DE10140187A1 (de) * 2001-08-22 2003-03-20 Hinrich H Swyter Handbediengerät
CN102490705A (zh) * 2011-12-15 2012-06-13 奇瑞汽车股份有限公司 一种电子机械制动系统以及采用所述制动系统的汽车
EP2915689A1 (fr) * 2014-03-03 2015-09-09 Peter Short Commande à pédale
CN104626983A (zh) * 2014-03-16 2015-05-20 易莹 安全型汽车
CN207931694U (zh) * 2018-02-11 2018-10-02 上汽通用五菱汽车股份有限公司 一种电子手刹的应急驻车系统
CN109305149A (zh) * 2018-10-24 2019-02-05 浙江零跑科技有限公司 一种用于电动汽车的附加制动装置
CN109334637A (zh) * 2018-12-09 2019-02-15 曹显亮 制动踏板左边设有副制动踏板的汽车及副制动操作方法

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CN110712632A (zh) 2020-01-21

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