EP4069570A1 - Ventilation system and ventilation method - Google Patents
Ventilation system and ventilation methodInfo
- Publication number
- EP4069570A1 EP4069570A1 EP20815726.3A EP20815726A EP4069570A1 EP 4069570 A1 EP4069570 A1 EP 4069570A1 EP 20815726 A EP20815726 A EP 20815726A EP 4069570 A1 EP4069570 A1 EP 4069570A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- air
- vehicle
- exhaust air
- vehicle interior
- ventilation system
- 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.)
- Pending
Links
- 238000009423 ventilation Methods 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 12
- 108090000623 proteins and genes Proteins 0.000 claims 1
- 238000007599 discharging Methods 0.000 abstract description 3
- 238000004378 air conditioning Methods 0.000 description 9
- 230000001143 conditioned effect Effects 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 230000001133 acceleration Effects 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 235000019645 odor Nutrition 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61D—BODY DETAILS OR KINDS OF RAILWAY VEHICLES
- B61D27/00—Heating, cooling, ventilating, or air-conditioning
- B61D27/0018—Air-conditioning means, i.e. combining at least two of the following ways of treating or supplying air, namely heating, cooling or ventilating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00357—Air-conditioning arrangements specially adapted for particular vehicles
- B60H1/00371—Air-conditioning arrangements specially adapted for particular vehicles for vehicles carrying large numbers of passengers, e.g. buses
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00642—Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
- B60H1/00735—Control systems or circuits characterised by their input, i.e. by the detection, measurement or calculation of particular conditions, e.g. signal treatment, dynamic models
- B60H1/008—Control systems or circuits characterised by their input, i.e. by the detection, measurement or calculation of particular conditions, e.g. signal treatment, dynamic models the input being air quality
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/24—Devices purely for ventilating or where the heating or cooling is irrelevant
- B60H1/248—Air-extractors, air-evacuation from the vehicle interior
Definitions
- the present invention relates to a ventilation system and a ventilation method for a vehicle, in particular a wagon, and a vehicle with such a ventilation system.
- air conditioning systems In order to enable comfortable travel, vehicles, for example buses or rail vehicles, in particular individual wagons, have air conditioning systems. Part of such an air conditioning system is usually a ventilation system with which conditioned air is blown into the interior of the vehicle. For example, cooled air can be blown out from air outlet openings embedded in the vehicle ceiling, while heated air can be blown out in the area of the vehicle floor.
- the ventilation system can also be used to extract "used" air from the vehicle interior. It is known, for example, to monitor the temperature and / or the C02 content of the indoor air in public transport and to regulate the fresh air supply or exhaust air as a function thereof .
- a ventilation system for a vehicle, in particular a wagon, according to a first aspect of the invention has (i) a supply air arrangement for introducing air into the vehicle interior,
- the ventilation system also comprises a control device which is set up to control the at least two exhaust air devices independently of one another on the basis of the temperatures determined in a spatially resolved manner.
- a vehicle within the meaning of the invention is preferably a means of transport, in particular for transporting people.
- the vehicle is preferably a rail-bound vehicle, such as a wagon or railcar. But it is also conceivable to regard a vehicle as a bus, ship or even an airplane.
- An exhaust air arrangement within the meaning of the invention has vorzugswei se means that are set up for sucking off and / or for guiding air out of the vehicle interior.
- the exhaust air arrangement can also have air ducts that connect the vehicle interior to the exhaust air devices and / or the (outside) environment of the vehicle .
- At least part of the exhaust air arrangement is preferably arranged on a roof or under a floor of the vehicle.
- the exhaust air arrangement can also be arranged in the roof, in the floor and / or in the walls of the vehicle.
- the vehicle roof, the vehicle floor and / or the vehicle walls can, in sections, form at least part of the exhaust air arrangement, for example the air ducts.
- An exhaust air device within the meaning of the invention is vorzugswei se a means for generating an air flow, in particular in an air duct, ie a turbo machine with which a gaseous medium can be conveyed.
- the exhaust air device is preferably set up to suck in air.
- Ei ne exhaust device can be formed, for example, as a fan.
- One aspect of the invention is based on the approach of providing at least two exhaust air devices which are set up to suck air from a vehicle interior independently of one another.
- a control device is preferably provided which is set up to control the at least two exhaust air devices independently of one another.
- the control device can operate the at least two exhaust air devices with different powers or speeds.
- the control device can thus also be set up to generate at least two differently pronounced pressure sinks in the vehicle interior with the aid of the at least two exhaust air devices, ie via a corresponding control of the at least two exhaust air devices.
- This control allows a spatially resolved temperature control or air conditioning of the vehicle interior, for example by extracting more air from a section of the vehicle interior than from another section.
- This temperature control or air conditioning is preferably produced in that the air supplied to the vehicle interior is inhomogeneously removed, for example with the aid of a supply air arrangement, in particular spatially homogeneous. If the control device generates two differently shaped pressure sinks in the vehicle interior using the at least two exhaust air devices, for example, the air flow of the air supplied to the vehicle interior to the more pronounced pressure sink is greater. The area around the more pronounced pressure sink can therefore z. B. be cooled more.
- the spatially resolved temperatures can be used as a basis for controlling the exhaust air devices by the control device. This allows individual sections of the vehicle interior in which to For example, increased temperatures are measured, can be cooled in a targeted manner. In these areas, heated air can be extracted in a targeted manner so that cool air can flow in from the supply air arrangement.
- the control device is set up to determine the direction of an air flow in the vehicle interior with the aid of the at least two exhaust air devices, d. H. by appropriately activating the at least two exhaust air devices.
- the control device is preferably set up to control the at least two exhaust air devices in such a way that the direction of an air flow in the vehicle interior is controlled.
- the control device can in particular be set up to use the at least two exhaust air devices to generate an air flow into a section of the interior of the vehicle in which a determined temperature reaches or exceeds a predetermined temperature threshold value.
- air that is preferably homogeneously supplied to the vehicle interior, in particular cooled or air-conditioned can be moved in the vehicle interior in a targeted manner for the purpose of temperature regulation.
- the exhaust air arrangement is designed such that air can be removed from the vehicle interior in at least two different sections of the vehicle interior independently of one another.
- the exhaust air arrangement can have a plurality of exhaust air ducts which connect the at least two different sections with the at least two exhaust air devices and / or the surroundings of the vehicle.
- one of the exhaust air arrangements can be connected to a toilet of the vehicle via an exhaust air duct, while another of the exhaust air arrangements is connected to a passenger compartment of the vehicle via an exhaust air duct. This makes it possible to remove sufficient air from the toilet in any situation to avoid unpleasant odors inside the car, in particular regardless of whether a high or only a small amount of air is removed from the passenger compartment.
- the exhaust air arrangement is designed such that air can be removed from the vehicle interior, in particular a vehicle interior, independently of one another in the area of two opposite ends of the vehicle interior.
- the exhaust air arrangement can each have at least one exhaust air duct in the area of the two opposite ends for connecting these areas with at least one of the at least two exhaust air devices. This makes it possible in particular to counteract a temperature gradient in the vehicle interior.
- the conveying capacity of one of the at least two exhaust air devices can be increased in this area in the more densely occupied area to create a pressure sink.
- Subsequent, preferably cooled or conditioned air can then efficiently absorb heat given off by the bodies of the passengers before it is sucked off. Since none or at least less of the cooled air flows into the sparsely occupied area, an unintentional drop in temperature can be avoided there at the same time.
- the exhaust air arrangement has at least two exhaust air ducts, each with at least two ends on the interior space, with each of the Exhaust ducts at least one of the at least two Abluftvor devices is connected and the at least two exhaust ducts are connected to one another via a duct connection.
- the channel connection preferably runs transversely to a longitudinal direction of the vehicle.
- the exhaust air arrangement is also preferably designed such that each of the at least two exhaust air devices is connected to each of the interior-side ends of the at least two exhaust air ducts.
- the at least two exhaust air devices are preferably connected to one of the exhaust air ducts on the suction side in such a way that they are closer to one part of the interior-side ends than to another part.
- each of the at least two exhaust air devices can each be assigned to a part of the ends on the interior side, the assignment preferably being defined via the distance between the exhaust air device and the inner room-side ends.
- An exhaust air device is preferably assigned to that part of the interior-side ends to which the exhaust air device has the shortest distance, in particular to which the distance does not reach or exceed a predetermined distance threshold value.
- the path of the air from the end on the inside to the exhaust air device is preferably to be understood at a distance. Due to the short distance, the exhaust air devices can extract air from the vehicle interior particularly efficiently.
- the channel connection is formed by at least part of a chassis of the vehicle.
- the channel connection can be formed by a car body of a wagon. This means that the ventilation system can be kept particularly compact.
- the sensor arrangement is set up to measure temperatures in at least two to detect different sections in the vehicle interior, the control device being set up to independently remove air from the at least two different sections on the basis of the temperatures recorded there with the help of the at least two exhaust air devices, ie by appropriately controlling the at least two exhaust air devices.
- the control device is preferably set up to control the at least two exhaust air devices on the basis of the determined temperatures in such a way that air is removed from the at least two different sections independently of one another.
- the control device can be set up to control at least one of the exhaust air devices in such a way that the air is discharged from one of the sections in which the determined temperature reaches or exceeds a predetermined temperature threshold value.
- the temperatures in the vehicle interior can be regulated in a particularly targeted manner in a spatially resolved manner.
- the sensor arrangement has at least two temperature sensors which are arranged in areas of two opposite ends of the vehicle interior.
- control device is set up to control the exhaust air devices on the basis of a movement of the vehicle.
- a movement here is preferably to be understood as an acceleration, for example a braking.
- the ventilation system can be used, for example, to compensate for movements of the air column inside the vehicle that are generated when the vehicle is accelerating. This not only makes it possible to increase the comfort of the passengers in the vehicle, but can also avoid or at least reduce the undesired mixing of air from different sections of the vehicle interior.
- control device is set up to control the exhaust air devices in such a way that (i) when the vehicle is braked, more air is discharged in an area at the rear end of the vehicle in the direction of movement than in an area at the front end in the direction of movement of the vehicle interior, and / or (ii) when accelerating the vehicle in the area at the rear end of the vehicle interior in the direction of movement less air is discharged than in the area at the front end of the vehicle interior in the direction of movement.
- a vehicle, in particular a wagon, according to the second aspect of the invention has a ventilation system according to the first aspect of the invention.
- a ventilation method for a vehicle in particular a wagon, according to a third aspect of the invention, air is supplied into the vehicle interior.
- temperatures inside the vehicle are determined in a spatially resolved manner.
- at least two exhaust air devices for discharging air from the vehicle interior are further controlled independently of one another on the basis of the spatially resolved temperatures.
- FIG. 1 shows an example of a ventilation system
- FIG. 2 shows an example of a vehicle with a ventilation system
- FIG 3 shows an example of a ventilation method.
- a ventilation system 1 for a vehicle in particular a wagon, with a supply air arrangement 2 for introducing air into the vehicle interior, a sensor arrangement 3 for spatially resolved determination of temperatures inside the vehicle and an exhaust air arrangement 4 with two exhaust air devices in the example shown 5 for removing air from the vehicle interior.
- a control device 6 is provided which is set up to control the at least two exhaust air devices 5 independently of one another on the basis of the temperatures determined in a spatially resolved manner.
- the supply air arrangement 2 in particular air-conditioned air, for example heated or cooled air, can be introduced into the vehicle interior or supplied to the vehicle interior Example blown in.
- the supply air arrangement 2 can have an air conditioning system (not shown), which sucks in air from the interior of the vehicle or an (external) environment of the vehicle and conditions it. The air conditioned in this way can then be guided via a supply air duct system (not shown) to air outlets 2a, via which it is introduced into the vehicle interior.
- the supply air arrangement 2 can be designed to introduce ge cooled air via supply air outlets 2a in a ceiling of the vehicle, but heated air via air outlets 2a near the floor in the vehicle interior.
- a particularly homogeneous air conditioning can thus be achieved by a drop in the cooled air or a rise in the heated air.
- the air outlets 2a are preferably evenly distributed inside the vehicle, for example arranged at regular intervals in a longitudinal direction of the vehicle. As a result, the conditioned air can be homogeneously distributed inside the vehicle when it is introduced into the vehicle.
- the sensor arrangement 3 has two tempe rature sensors 3a, which are preferably arranged in different sections of the vehicle and are set up to detect the temperature prevailing in these sections.
- one of the temperature sensors 3a can be arranged in an area at a first end of the vehicle and another of the temperature sensors 3a in an area at a second end of the vehicle opposite the first end of the vehicle.
- each of the temperature sensors 3a is preferably signal-connected to the control device 6 in order to be able to provide the detected temperatures or corresponding signals or data to the control device 6.
- the exhaust air arrangement 4 preferably has an exhaust air duct system 7 composed of two exhaust air ducts. näl 8, which in the example shown extend in the longitudinal direction of the vehicle.
- Each of the two exhaust air ducts 8 has two ends 8a on the inside, via which air to be discharged can be sucked in from the vehicle interior.
- one of the Abluftvor devices 5 is connected to each of the exhaust ducts 8.
- the exhaust air devices 5 can, for example, be designed as ventilators, which are connected on the suction side to one of the exhaust air ducts 8 and are set up to expel the air extracted from the vehicle inside the vehicle.
- the fans are preferably speed or power controllable and are connected to the control device 6 signal, so that with the aid of the control device 6 a respective amount of air conveyed can be adjusted or controlled, in particular increased or decreased.
- the two exhaust ducts 8 are also connected via a duct connection 9 in the form of two connecting ducts 9 a, which is also part of the exhaust duct system 7.
- the connecting channels 9a preferably extend transversely to the longitudinal direction of the vehicle, i. H. also transversely to the exhaust air ducts 8.
- the two connecting ducts 9 a are each arranged in the area of an exhaust air device 5.
- Each of the exhaust air devices 5 can therefore also suck in air via the interior-side ends 8a of the opposite exhaust air channel 8 via the connecting channels 9a. This is advantageous, for example, if one of the Abluftvor devices 5 fails.
- each of the exhaust air devices 5 in the example shown in FIG. 1 is assigned to a part of the interior-side ends 8a. Each part is formed in a preferred manner of two opposite ends 8a on the inside.
- the exhaust air devices 5 are preferably arranged diagonally in the vehicle, ie for example point-symmetrically with respect to a center point of the vehicle in a horizontal cross-sectional plane.
- the assignment is preferably defined by the distance between the exhaust air devices 5 and the ends 8a on the interior space, with “distance” here being understood in particular as the length of the path covered by the air drawn in within the duct system 7 to the exhaust air device 5
- Exhaust air device 5 can be assigned to those exhaust air ducts 8 to which it is at a shorter distance than the other exhaust air device (s) 5.
- one of the exhaust devices 5 is assigned to the interior-side ends 8a at the first end of the vehicle and the other of the exhaust-air devices 5 is assigned to the interior-side ends 8a at the second end of the vehicle.
- the exhaust air devices 5 can, during operation, suck air for the most part from a region around the interior-side ends 8a to which they are assigned. Because the large distance to the other ends 8a on the interior side increases the suction resistance when sucking in air. If, purely by way of example, the speed or power of only one of the exhaust air devices 5 is increased, a pressure sink can be generated in the corresponding area around the assigned interior-side ends 8a, to which a large part of the air supplied into the vehicle interior with the aid of the supply air arrangement 2 flows. This area can, for example, be cooled in a targeted manner.
- control device 6 is preferably set up to evaluate the spatially resolved temperatures or signals or data provided by the sensor arrangement 3 and to control the exhaust air devices 5 independently of one another on the basis of this evaluation.
- control device 6 can identify sections of the vehicle interior in which temperatures prevail which are above a predetermined temperature threshold value and control the exhaust air devices 5 in such a way that pressure sinks arise in the identified sections. This allows warm air from the identified waste Sections are removed, while cooled air, supplied via the supply air arrangement 2, flows into the identified sections for cooling.
- FIG. 2 shows an example of a vehicle 10 with a ventilation system 1 for removing air from the vehicle interior.
- the vehicle 10 is, purely by way of example, a wagon for rail-bound passenger transport.
- the vehicle 10 shown therefore has a plurality of seats 11 in the vehicle interior, of which only one is provided with a reference number for the sake of clarity.
- the ventilation system 1 has two exhaust air devices 5, of which, however, only one is visible in the selected view.
- the exhaust air devices 5 are each connected to an exhaust air duct 8 which runs in a longitudinal direction of the vehicle 10 and in the example shown has three interior-side ends 8a.
- the Abluftvor devices 5 are on a sub-floor, d. H. arranged on the underside of the vehicle 10 and set up to
- the ventilation system 1 also has a supply air arrangement and a sensor arrangement, both of which are not shown in FIG. 2 for reasons of clarity.
- a control device (not shown) of the ventilation system 1 is preferably set up to control the exhaust air devices 5 on the basis of the spatially resolved recorded temperatures and thereby also the air flow, in particular the air supplied with the aid of the supply air arrangement, inside the vehicle.
- a pressure drop can be generated at the end of the vehicle 10 at which the school class gather with the aid of the ventilation system 1 by appropriately controlling at least one of the exhaust air devices 5 sits.
- the delivery rate of one of the exhaust air devices 5 can be increased in order to draw off more heated air from the students through the ends 8a on the inside of the room, in the vicinity of which the school class is sitting. This can prevent the temperature from ren also in other sections of the vehicle interior, in which the detected temperature exceeds the predetermined tempe raturschwellenwert z. B. due to low occupancy of the Sit ze 11 is not reached or exceeded, is lowered.
- FIG. 3 shows an example of a ventilation method 100 which can be used, for example, for air conditioning a vehicle, in particular a wagon.
- air is supplied to the vehicle interior, for example with the aid of a supply air arrangement.
- the air supplied is preferably air-conditioned air that is taken from the surroundings of the vehicle, for example.
- the supply of such fresh air allows not only interior temperature control but also the provision of sufficient oxygen inside the vehicle.
- temperatures in the vehicle interior are determined spatially resolved, for example with the aid of a sensor arrangement.
- temperatures measured can be arranged in different sections of the vehicle.
- step S3 at least two exhaust air devices of a ventilation system, as shown for example in FIG. 1, are controlled independently of one another on the basis of the spatially resolved temperatures.
- the exhaust air devices can, for example, be controlled in such a way that an air flow is formed in a section of the vehicle interior in which the detected temperature reaches or exceeds a predetermined temperature threshold value.
- one of the exhaust air devices is preferably operated at a speed or (delivery) output that is higher than that of the other exhaust air devices.
- the exhaust air devices can also be controlled in such a way that the air flow that forms counteracts a movement of the air column in the vehicle interior, which is caused by a movement, in particular acceleration, of the vehicle.
- the vehicle brakes for example, at least one of the exhaust air devices can be operated in an end of the interior of the vehicle that is at the rear in the direction of travel at a speed or (delivery) output that is higher than that of the other exhaust air devices.
- the resulting compensation of the air column movement makes it possible to avoid or at least reduce undesired turbulence in the air inside the vehicle, which could possibly lead to unfavorable inhomogeneous air conditioning.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Air-Conditioning For Vehicles (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102019218847 | 2019-12-04 | ||
PCT/EP2020/081295 WO2021110354A1 (en) | 2019-12-04 | 2020-11-06 | Ventilation system and ventilation method |
Publications (1)
Publication Number | Publication Date |
---|---|
EP4069570A1 true EP4069570A1 (en) | 2022-10-12 |
Family
ID=73598824
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20815726.3A Pending EP4069570A1 (en) | 2019-12-04 | 2020-11-06 | Ventilation system and ventilation method |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP4069570A1 (en) |
WO (1) | WO2021110354A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102023201597A1 (en) * | 2023-02-22 | 2024-08-22 | Siemens Mobility GmbH | Exhaust system, air conditioning system and track-guided vehicle |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2610108A1 (en) * | 1976-03-11 | 1977-09-22 | Messerschmitt Boelkow Blohm | Ventilation system for rail vehicles - has double channel for fresh and recirculated air with interconnected mixing apertures |
DE3302424C2 (en) * | 1983-01-26 | 1985-03-21 | Messerschmitt-Bölkow-Blohm GmbH, 8000 München | Device for air conditioning a passenger compartment |
AU641327B1 (en) * | 1992-10-27 | 1993-09-16 | Kawasaki Jukogyo Kabushiki Kaisha | Ventilating apparatus for conveyance |
KR20050122031A (en) * | 2004-06-23 | 2005-12-28 | 현대자동차주식회사 | Ventilating device for bus |
JP2012071680A (en) * | 2010-09-28 | 2012-04-12 | Hitachi Ltd | Railway vehicle including air intake device, exhaust device and exhaust blower, and method for controlling air intake device, exhaust device and exhaust blower provided in railway vehicle |
DE102014226279A1 (en) * | 2014-12-17 | 2016-06-23 | Siemens Aktiengesellschaft | Vehicle with emergency operation for air conditioning |
US20160229257A1 (en) * | 2015-02-10 | 2016-08-11 | Ford Global Technologies, Llc | Vehicle and vehicle cabin air extraction system |
-
2020
- 2020-11-06 EP EP20815726.3A patent/EP4069570A1/en active Pending
- 2020-11-06 WO PCT/EP2020/081295 patent/WO2021110354A1/en unknown
Also Published As
Publication number | Publication date |
---|---|
WO2021110354A1 (en) | 2021-06-10 |
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