Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
  • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
  • B62M6/00—Rider propulsion of wheeled vehicles with additional source of power, e.g. combustion engine or electric motor
  • B62M6/40—Rider propelled cycles with auxiliary electric motor
  • B62M6/55—Rider propelled cycles with auxiliary electric motor power-driven at crank shafts parts
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
  • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
  • B62M6/00—Rider propulsion of wheeled vehicles with additional source of power, e.g. combustion engine or electric motor
  • B62M6/40—Rider propelled cycles with auxiliary electric motor
  • B62M6/60—Rider propelled cycles with auxiliary electric motor power-driven at axle parts
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
  • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
  • B62M11/00—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels
  • B62M11/04—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels of changeable ratio
  • B62M11/14—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels of changeable ratio with planetary gears
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
  • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
  • B62M11/00—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels
  • B62M11/04—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels of changeable ratio
  • B62M11/14—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels of changeable ratio with planetary gears
  • B62M11/145—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels of changeable ratio with planetary gears built in, or adjacent to, the bottom bracket
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
  • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
  • B62M11/00—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels
  • B62M11/04—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels of changeable ratio
  • B62M11/14—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels of changeable ratio with planetary gears
  • B62M11/18—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels of changeable ratio with planetary gears with a plurality of planetary gear units
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
  • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
  • B62M6/00—Rider propulsion of wheeled vehicles with additional source of power, e.g. combustion engine or electric motor
  • B62M6/40—Rider propelled cycles with auxiliary electric motor
  • B62M6/45—Control or actuating devices therefor
  • B62M6/50—Control or actuating devices therefor characterised by detectors or sensors, or arrangement thereof
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
  • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
  • B62M6/00—Rider propulsion of wheeled vehicles with additional source of power, e.g. combustion engine or electric motor
  • B62M6/80—Accessories, e.g. power sources; Arrangements thereof
  • B62M6/90—Batteries

Definitions

• the present invention pertains to the field of electrically powered bicycles (or “e-bikes”) with an electric motor assisting the rider’s pedal-power. More specifically, the present invention concerns a hybrid driveline for an e-bike.
• the power split hybrid concept is well known in automotive engineering, and has also been proposed for e-bikes within academic research. This proposal describes a practical mechanical implementation of the concept, which has the possibility of being packaged in between the pedals of a bicycle.
• e-bikes generally use standard bicycle components for their drivelines. Regardless of whether the assistance motors are mounted within the centre of the frame or inside a wheel hub, the drive and gearing mechanisms connecting the pedals to the rear wheel usually consist of a drive chain or belt, and a hub mounted gear-system or derailleur system for changing ratios. Usually, selection of gears is manual and at the discretion of the rider.
• NuVinci Continuously Variable Planetary Transmission which is a hub mounted system offering a continuously variable gear ratio which may be electronically shifted and may be interfaced with the controller for the electrical assist motor. See WO 2005/019686 A2.
• WO 2020/260772 Al discloses a power unit for pedal vehicle.
• the power unit comprises a pedal shaft, an output shaft arranged to transfer torque to a vehicle wheel, a main epicyclic gear set arranged to control transmission ratio between the pedal shaft and the output shaft, an assist motor connected to an assist gear of the main epicyclic gear set, and a control motor connected to a control gear of the main epicyclic gear set.
• the control motor and the control gear form a control assembly of the power unit.
• the power unit comprises a oneway clutch associated with the control assembly of the power unit and arranged to transmit rotation in only a first rotation direction.
• DE 10 2017 003945 Al discloses an electric auxiliary drive system for a bicycle, comprising an assist motor, a control motor, a pedal crankshaft for operation by a rider, and an epicyclic gearing mechanism arranged to determine the transmission ratio between the pedal crankshaft and an output shaft for transmitting rotation to a rear wheel of the bicycle.
• the assist motor and the control motor are designed as hollow-shaft drives with internal teeth engaging respective sets of planets of epicyclic gears.
• a first set of planet gears engaged by the assist motor have their planetary carrier in common with the planetary carrier of a second set of planet gears engaging the sun gear, which is secured for rotation with an output shaft, and a ring gear.
• This ring gear is rigidly connected to the planetary carrier of a third set of planet gears driven by the internal teeth of the control motor.
• the speed of the control motor determines the speed of the ring gear and thus the transmission ratio between the pedal crankshaft and the output shaft.
• the present invention provides an electric auxiliary drive system for a bicycle, having the features defined in claim 1.
• Preferred embodiments are defined in the dependent claims.
• the drive system comprises a pedal crankshaft for operation by a rider, an epicyclic gearing mechanism, an assist motor and a control motor.
• the epicyclic gearing mechanism is arranged to determine the transmission ratio between the pedal crankshaft and an output shaft for transmitting rotation to a rear wheel of the bicycle.
• a sun gear is secured for rotation with the output shaft
• a set of planet gears are arranged between the sun gear and a ring gear.
• a planet carrier is secured for rotation with the pedal crankshaft and supports the planet gears.
• the assist motor has a rotor drivingly connected to a gear secured to or integral with the sun gear, in order to drive the output shaft.
• the control motor is drivingly connected to the ring gear for controlling the transmission ratio between the output shaft and the pedal crankshaft.
• Figure 1 is a schematic cross-sectional view of the main components of an e-bike drive system according to an embodiment of the present invention
• Figure 2 shows a close-up view of the mechanical layout of the electric motors and an epicyclic gearing mechanism of Figure 1;
• Figure 3 diagrammatically shows the torque split relationship through the epicyclic gear mechanism
• Figure 4 is a diagram showing the electrical power flow through the system during normal pedalling
• Figures 5A and 5B are simplified diagrams showing the speed relationship between various elements of the epicyclic power-split gearing mechanism, respectively while starting the bicycle and while cruising;
• Figure 6 is a diagram showing the electrical power flow through the system during regenerative braking
• Figure 7 is a schematic cross-sectional view of the main components of an e-bike drive system according to an alternative embodiment of the present invention, with the electric motors mounted at the side of the epicyclic gear mechanism;
• Figure 8 is an enlarged cross-sectional view showing the drive unit according to the alternative layout of Figure 7;
• Figure 9 is a cross-sectional view of an embodiment of the e-bike drive system including a device offering a fixed gear ratio to allow the bicycle to be ridden with a flat battery;
• Figures 9A and 9B are enlarged views of a detail of Figure 9, in two different operational conditions
• Figure 10 is a cross-sectional view of an embodiment of the e-bike drive system including a mechanical freewheel device
• Figure 11 and Figure 12 are schematic views of two different freewheel devices that may be incorporated in the e-bike drive system. Detailed description
• an e-bike drive system comprises a housing 1, which may be mounted in use centrally within the frame of a bicycle (at the ‘bottom bracket’).
• the housing 1 contains two electric motors, Ml, M2, and an epicyclic gearing mechanism 30 having an output shaft 25.
• Ml, M2 electric motors
• M2 epicyclic gearing mechanism 30 having an output shaft 25.
• a chain ring 11 Secured for rotation with the output shaft 25 is a chain ring 11 that drives the rear wheel 40 of the bicycle.
• the housing 1 provides mountings and reaction points the rolling bearings 19 rotatably supporting a pedal crankshaft 7 and may also contain an electronic controller 16 for the drive system.
• Electric motor Ml is termed “control” motor, because it drives a gear of the epicyclic gearing mechanism that controls the transmission ratio between the output shaft and the pedal crankshaft.
• Electric motor M2 termed “assist” motor herein, generates power that is transmitted to the output shaft 25.
• the epicyclic gearing mechanism is also referred to as an epicyclic “powersplit” gearing mechanism, because it is arranged to transfer power from the pedals to the rear wheel of the bicycle through two routes, as explained herein after: a mechanical route and an electrical route.
• the epicyclic gearing mechanism transmits power from the assist motor M2 to the output shaft.
• the epicyclic gearing mechanism adjusts the rotational speed of the pedal crankshaft 7 as a result of the operation of control motor Ml.
• control motor Ml is an AC, brushless, synchronous motor arrangement, also known as a PMSM - Permanent Magnet Synchronous Motor.
• the control motor may have a maximum steady state power of about 150W, and a peak power of about 300W. By way of indication, the maximum speed of this motor may be approximately 1600rpm.
• the assist motor M2 which comprises a rotor 4 and stationary windings 5, may also be a PMSM motor.
• the assist motor M2 has a maximum steady state power of about 250W, and a peak power of about 500W.
• the maximum speed of this motor may approximately be 3000rpm.
• the epicyclic gearing mechanism 30 comprises a planet carrier 6 for planetary gears 9.
• the carrier 6 is secured for rotation with the pedal shaft 7.
• a torque sensor 23 may be incorporated within the pedal shaft 7 or the planetary gear carrier 6 to detect the pedalling torque applied to the system by the rider.
• the pedal shaft 7 passes through the entire assembly from side to side and connects together left and right pedal crank assemblies 8a, 8b, each of which comprises a crank arm and a pedal which is mounted to the arm by a rotating joint, in a conventional manner.
• the planetary gears 9 of the power split gearing mechanism 30 are mounted on the carrier 6 using bearings which allow free rotation of the gears 9 relative to the carrier 6.
• the power split epicyclic gearing mechanism 30 comprises a sun gear 10 which is driven for rotation by the assist motor M2 and is secured for rotation with the chain-ring 11 located on the right side of the system.
• the sun gear 10 is secured to or integral with the chain-ring 11 through the output shaft 25, which may be in form of an axially extending central tubular portion that surrounds coaxially a length of the pedal crankshaft 7.
• sun gear 10 is secured to or integral with a gear 15 in order to be drivingly connected, either directly or through a set of reduction gears 14, with the rotor 4 of the assist motor M2.
• the gear 15 that receives the driving torque originating from the assist motor M2 is in form of an internally toothed ring gear 15.
• the sun gear 10, the output shaft 25 and the gear 15 that received the driving torque of assist motor M2 may are secured together for rotation as a unit.
• Embodiments may provide that the sun gear, the output shaft 25 and the gear 15 may be in formed in a single piece or composed of separate parts fixedly secured together.
• the sun gear 10 is driven by the output shaft of the rotor 4 of the assist motor M2 through a set of reduction gears 14 acting between the output shaft 25 and the sun gear 10.
• the sun gear 10 may be formed with or secured to a radial extension 24 that provides the gear 15 in form of an internally toothed peripheral ring gear 15 that meshes with the reduction gears 14.
• the reduction gears 14 may be mounted for free rotation about respective stationary axial supporting pins integral with the housing.
• the chain-ring 11 has a peripheral shape which allows it to drive a sprocket 18 mounted to the rear wheel hub 41 of the bicycle via either a flexible transmission means 17, such as a roller chain or a toothed polymer belt ring, and the sprocket 18.
• the rear wheel is designated at 40.
• the sprocket 18 may be a fixed sprocket without any free-wheel or gearing devices.
• the chain-ring/rear sprocket transmission ratio is numerically less than 1.
• the rotor 2 of the control motor Ml transfers drive to a ring gear 13 which meshes with the planetary gears 9 (which are mounted on the carrier 6 that is secured for rotation with the pedal crankshaft). Furthermore, the rotor 4 of the assist motor M2 transfers drive to the sun gear 10 through the planetary gears 9.
• the ring gear 13 is configured with a dual set of teeth, arranged to mesh both with the planetary gears 9 and a set of planetary reduction gears 12 which mesh with and are driven by an output shaft 2a of the rotor 2 of the control motor Ml .
• the reduction gears 14 of the assist motor M2 are mounted for free rotation about respective stationary axial supporting pins integral with the housing.
• the dual set of teeth are formed as internal toothings on the ring gear 13.
• Embodiments may provide, as illustrated in the example of figure 1, that the toothings of the dual set of toothings on ring gear 13 are provided on axially staggered or axially offset portions of the ring gear 13.
• Alternative embodiments may provide that the dual set of toothings are arranged one on the radially inner surface and the other on the radially outer surface of the gear ring.
• the toothing of the gear ring 13 meshing with the reduction gears 12 is set on a larger diameter than the toothing meshing with the planetary gears 9
• alternative embodiments may either provide a same diameter for both toothings, or a wider diameter for the toothing meshing with the planetary gears 9.
• a number of rolling bearing elements are included within the mechanism to support and allow rotation between the motor rotors, the epicyclic gear elements and the pedal crank shaft.
• a first rotation sensor preferably an angular position sensor 21 measures the angular position of the rotor 2 of the control motor Ml relative to the housing 1.
• a second rotation sensor preferably an angular position sensor 22 measures the angular position of the rotor 4 of the assist motor M2 relative to the housing 1.
• An electronic controller 16 which receives information about the angular positions of the control and assist motors from angular position sensors 21, 22, and the torque applied to the pedals by the rider from a torque sensor 23. Using this information, the controller 16 computes the actual speed of the bicycle and of the pedals and the effort of the rider, and using a pre-determined control strategy computes the desired level of torque assistance and the desired speed ratio between the pedals and the bicycle wheels.
• the controller consequently commutates the current within the windings 3 and 5 of electric motors Ml and M2 according to the measured angular positions of their corresponding rotors (2 and 4) in order to achieve a speed set-point at control motor Ml and a torque set point at assist motor M2.
• Internal power circuitry within the controller 16 is arranged so that motor 1 and motor 2 may both function as either motors or as generators, and so that electrical power may flow in any direction between the either of the motors and a battery 20.
• the battery 20 provides necessary electrical energy to assist the rider in powering the bicycle.
• Figure 3 diagrammatically shows the torque split relationship through the epicyclic gear mechanism.
• Figure 3 diagrammatically shows the torque split relationship through the epicyclic gear mechanism.
• Tr torque applied to the ring gear
• Ts Fs (Zr - Zs)
• the electrical power flow through the system during normal pedalling is discussed with reference to Figure 4.
• the control strategy for the electric motors is as follows.
• the electronic controller 16 varies the electrical current passing through the windings of the motor Ml in order to maintain a requested speed, regardless of the torque applied to the control motor Ml.
• the requested speed set-point of this motor is selected in order to achieve a desired pedalling speed for the rider, in order to maximise rider comfort and minimise exhaustion.
• the desired pedalling speed i.e. the desired rotational speed of the planetary carrier 6
• the desired speed of the ring gear 13 may then be calculated in real-time, and hence the speed of the control motor Ml .
• Zr and Zs are the radii of the mechanism which define the lever ratios within the epicyclic gear mechanism, as described graphically in Figure 3.
• Figure 5A depicts the situation when the bicycle is moving slowly. In order to maintain a comfortable pedalling speed for the rider, it is desirable for the pedals to turn more quickly than the sprocket 18.
• the control motor Ml should turn the ring gear 13 at a higher speed than the pedals in order to maintain the required pedalling speed.
• Figure 5B depicts the situation when the bicycle is cruising, i.e. moving quickly.
• the pedals In order to maintain rider comfort, the pedals should be turning more slowly than the front chain sprocket 18.
• the control motor Ml is therefore required to turn the ring gear 13 more slowly than the pedals in order to maintain the required pedalling speed.
• an ‘assistance mode’ may be selected whereby the control system measures the torque or power supplied by the rider to the system.
• the torque may be calculated in real time by measuring the torque applied by the rider using the torque transducer 23, and the speed of the two motor rotors 2 and 4 using the angular position sensors 21 and 22.
• a proportional assistance power may then be determined, based on a desired level of assistance specified by the rider.
• a ‘charge sustaining’ mode may be selected, where a negative torque set-point is applied to the control algorithm for the assist motor M2 during certain riding conditions, for example when riding at a steady speed on level or slightly down-hill road gradients.
• the assist motor M2 functions as an electricity generator under these road conditions, and generated energy may be stored by the battery 20 which may then be re-used during accelerating or hill-climbing manoeuvres.
• the useable range of the electrical assistance system may be extended without exposing the rider to undue additional exhaustion.
• typical values for the motor reduction gear ratios, planetary gear ratios and chain-ring/rear sprocket ratios may be as follows. It is assumed that the e- bike is fitted with conventional touring wheels and tyres and that assistance is limited to 25km/h (the maximum legal speed for e-bike assistance within some jurisdictions): reduction ratio of the control motor Ml (i.e. the velocity of the control motor Ml) / (power split epicyclic ring gear velocity)) should be in the order of 15; reduction ratio of the assist motor M2 (i.e.
• the velocity of the assist motor M2) / (power split epicyclic sun gear velocity) should be in the order of 10; the planetary gear ratio (i.e. Zr/Zs) should be in the order of 3.5; the chain or belt system ratio, i.e. (number of teeth on the chain-ring)/(number of teeth on the sprocket) should be in the order of 0.8.
• Figure 6 illustrates the electrical power flow through the system whilst braking with stationary pedals.
• a different set of control strategies may be employed. It is expected that, when the bicycle is slowing down, the rider will wish to stop pedalling the bicycle or ‘freewheel’. This function may be achieved without the use of a specific freewheel device, by controlling the speed of the control motor Ml with respect to the speed of the sun-gear 10 within the planetary mechanism.
• Wc desired planetary carrier speed
• the pedal speed may be controlled to 0 if the control motor Ml is spun in the reverse direction at the appropriate speed. It is not expected that any significant torque will be applied by the rider to the pedals during this condition, therefore no significant torque will be supplied to the control motor Ml. It is only necessary to supply minimal energy to the control motor Ml to rotate it at the necessary speed.
• a negative torque setpoint may be applied to the controller for the assist motor M2, which will function as a generator whilst applying a braking torque through the drive-line and consequently allow some electrical energy to be recovered and stored within the battery 20.
• the electric motors Ml and M2 are axially aligned and concentrically arranged around the pedal crank shaft 7.
• the gear 15 driven by the rotor 4 of the assist motor M2 is an outwardly toothed peripheral gear secured for rotation or integral with the sun gear 10 and the output shaft 25.
• Figure 9 shows an exemplary arrangement of an optional coupling device 42 that is coupled for rotation with the output shaft 25 and may be selectively coupled for rotation also with the planet carrier 6, thereby securing for rotation the output shaft 25 and the pedal shaft 7.
• the coupling device 42 comprises an externally axially splined tube 42 which slides concentrically within mating splines inside the tubular extension (or output shaft) 25 of the epicyclic sun gear 10.
• the tube 42 incorporates an external collar 43, which may be accessed externally to the assembly, on a side of the chain-ring 11.
• Tube 42 also incorporates axial teeth 44, which, when the splined tube 42 is slid into the assembly, engage in mating axial features, such as axial seats or recesses 45 formed in the planetary gear carrier 6. These axially engaging features fulfil the function of a ‘dog-clutch’.
• Figure 9A When disengaged ( Figure 9A), the power-split device is able to function freely; when engaged ( Figure 9B), motion is transferred directly from the pedal shaft 7 via the planetary carrier 6, and the tube 42 into the tubular output shaft (or sun gear extension) 25 and the chain-ring 11.
• the bicycle may be ridden with the same functionality as a conventional fixed gear bicycle.
• a mechanical ‘freewheel’ device 46 may be introduced into the structure, at the connection between the pedal shaft 7 and the planetary gear carrier 6, as shown in Figure 10.
• This device may be either a ‘pawl and ratchet’ type mechanism (Figure 11) where spring loaded pawls 47 engage with a ramped form 48 which is arranged around an internal (or external) diameter.
• a ‘sprag clutch’ type device may be used ( Figure 12), which employs rolling elements 49 arranged around a ramped cylindrical device 48 and biased by springs 50. The rolling elements 49 lock the device frictionally when the components are rotated relatively in one direction, and provide free relative motion in the opposite direction.
• the addition of a mechanical freewheel device may enhance the safety of the rider, who could otherwise be surprised by an unexpected rotation of the pedals if a failure within the freewheeling motor control strategy were to occur.
• the e-bike assistance motor and the means to vary the speed ratio between the pedals and the wheels can be integrated into a single unit which is mid-mounted in the bicycle; the rear wheel of the bicycle may be completely simplified;

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Transportation (AREA)
• Mechanical Engineering (AREA)
• Retarders (AREA)
• Structure Of Transmissions (AREA)
• Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

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Citations (7)

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• 2022
  • 2022-02-11 IT IT102022000002573A patent/IT202200002573A1/it unknown
• 2023
  • 2023-02-08 JP JP2024547491A patent/JP2025505714A/ja active Pending
  • 2023-02-08 DE DE112023000891.4T patent/DE112023000891T5/de active Pending
  • 2023-02-08 TW TW112104357A patent/TW202415583A/zh unknown
  • 2023-02-08 US US18/837,599 patent/US20250178693A1/en active Pending
  • 2023-02-08 CN CN202380021446.XA patent/CN119278167A/zh active Pending
  • 2023-02-08 WO PCT/EP2023/053052 patent/WO2023152154A1/en not_active Ceased

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