An electrically assisted street scooter includes a handlebar, a deck, front and back wheels, a battery pack integral with the deck, an electrical motor for driving at least one of the wheels, and a drive circuit for controlling electrical supply to the electrical motor from the battery pack. The dri
An electrically assisted street scooter includes a handlebar, a deck, front and back wheels, a battery pack integral with the deck, an electrical motor for driving at least one of the wheels, and a drive circuit for controlling electrical supply to the electrical motor from the battery pack. The drive circuit includes a switch for setting the drive circuit in a low power-mode where the electrical motor is not powered when the switch is off, or for setting the drive circuit in a drive mode where the electrical motor can be powered when the switch is on. An auto-power on circuit automatically switches the switch on when a user pushes the street scooter. An auto-power off circuit automatically switches the switch off when the scooter is not used during a predetermined duration. The level of electrical assistance is determined based on the peak value after each leg push.
대표청구항▼
1. An electrically assisted street scooter, comprising: a handlebar;a deck;at least one front wheel;at least one rear wheel;a battery pack integral with said deck;at least one electrical motor for driving at least one of said wheels; anda drive circuit for controlling electrical supply to said elect
1. An electrically assisted street scooter, comprising: a handlebar;a deck;at least one front wheel;at least one rear wheel;a battery pack integral with said deck;at least one electrical motor for driving at least one of said wheels; anda drive circuit for controlling electrical supply to said electrical motor from said battery pack, said drive circuit comprising: a switch for setting said drive circuit in a low power-mode, wherein said electrical motor is not powered when the switch is off, or for setting said drive circuit in a drive mode, where said electrical motor is powered when the switch is on;an auto-power on circuit electrically coupled with the electrical motor and the switch for automatically switching said switch on when a speed profile of the street scooter is consistent with a non-zero pre-determined speed profile of the scooter comprising a first phase of acceleration of the street scooter when the user pushes it with a leg, a second phase of fast deceleration when the user pulls a handlebar of the street scooter to re-center a body of the user after a leg push, and a third phase of deceleration of the street scooter due to friction and/or street slope; andan auto-power off circuit electrically coupled with the electrical motor and the switch for automatically switching said switch off when at least one of the front wheel or the rear wheel is not rotating during a predetermined duration, wherein said auto-power on circuit is driven by one of said at least one electric motor and said battery pack. 2. The street scooter of claim 1, wherein said switch is controlled for selectively setting said drive circuit into a low power mode without entirely disconnecting said drive circuit from said battery pack. 3. The street scooter of claim 1, arranged for switching the electrical motor on or off and for determining a level of electrical assistance based on a speed of said motor. 4. The street scooter of claim 1, arranged for switching the electrical motor on or off and for determining a level of electrical assistance based on an output signal of an accelerometer. 5. The street scooter of claim 1, wherein said drive circuit comprises a speed sensing module arranged to determine a maximum speed, wherein said drive circuit is capable of reducing the speed under said maximum speed each time a user pushes the street scooter with a leg, thus simulating a street scooter that runs with lower friction and/or simulating a street scooter that runs on a lower street slope. 6. The street scooter of claim 1, wherein said drive circuit comprises a module arranged for controlling a current supplied to said electrical motor based on a speed measured when speed of the driven wheel has reached a maximum speed. 7. The street scooter of claim 1, further comprising: one brake pedal for braking one wheel by friction when the brake pedal is pressed against this wheel; andat least one sensor arranged for generating a brake signal which can take more than two different values depending on a position of the brake pedal,wherein said drive circuit is arranged for controlling a braking torque applied by the electric motor to the wheel as a function of said brake signal. 8. The street scooter of claim 7, arranged for braking only with said electric motor when said brake pedal is pushed a first amount, and for braking by friction on the wheel and with said electrical motor when said brake pedal is pushed a second, larger amount. 9. The street scooter of claim 1, further comprising a speed and/or position detection module based on sensorless technology for detecting a rotation speed and/or a position of the at least one front wheel or the at least one rear wheel, wherein the electrical motor is mounted within said at least one front wheel or within said at least one rear wheel, and for powering multiple motor phases as a function of a position of a rotor. 10. The street scooter of claim 1, wherein said drive circuit is arranged for adjusting an electrical assistance during each phase as a function of a speed measured during a respective one of said phases. 11. The street scooter of claim 10, wherein said drive circuit is arranged for adjusting the electrical assistance as a function of a speed determined during or at an end of a respective one of said phases. 12. The street scooter of claim 1, wherein said drive circuit is arranged for determining a peak speed reached after a leg push and for adjusting an electrical assistance as a function of this peak speed reached after a leg push. 13. The street scooter of claim 1, wherein said drive circuit comprises a leg push determination module for differentiating between motion due to a leg push and motion due to other activities for which the electrical assistance should not be activated. 14. The street scooter of claim 13, wherein said drive circuit comprises a speed sensing module for sensing a speed of said scooter, said leg push determination module is arranged for determining based on a speed profile whether motion is caused by a leg push or by other motions. 15. The street scooter of claim 1, further comprising a user identification system, and wherein said drive circuit is arranged for braking said electrical motor when the user has not been identified. 16. A method for driving an electrical street scooter, the electrical street scooter comprising: a battery pack;at least one electric motor; anda drive circuit comprising a switch and an auto-power on circuit, the method comprising: automatically switching said switch on when a speed profile of the street scooter matches a non-zero predetermined speed profile of the street scooter comprising a first phase of acceleration of the street scooter when the user pushes it with a leg, a second phase of fast deceleration when the user pulls a handlebar of the street scooter to recenter a body of the user after a leg push, and a third phase of deceleration of the street scooter due to friction and/or street slope so as to power the at least one electrical motor; andautomatically switching said switch off in response to at least one of the front wheel or the rear wheel not rotating during a predetermined duration;wherein said auto-power on circuit is driven by one of said at least one electric motor and said battery pack. 17. The method of claim 16, further comprising: measuring a speed of said scooter and/or a rotational speed of a wheel of said scooter;using said speed and/or rotational speed to determine whether the scooter is leg propelled or if it moves for other reasons; andswitching said switch on only if it is determined that the scooter is leg propelled. 18. The method of claim 16, further comprising: switching a drive circuit from a first power mode to a second power mode when said electrical motor generates a current;determining with said drive circuit in said second power mode whether the scooter is leg propelled or if the motor turns for other reasons; andswitching said switch on only if it is determined that the scooter is leg propelled. 19. The method of claim 18, wherein switching a drive circuit in a second power mode comprises powering on a microcontroller, said microcontroller being used for determining based on a sequence of measured speed values phases during which the scooter is leg propelled.
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