Within its profile is: a motor (350W US, 250W EU), a battery (48V Li-ion), control electronics, and a Bluetooth radio. Battery life is estimated at 1,000 cycles, and charges in four hours.
Based on technology from MIT and made by Massachusetts-based company started by the inventors – Superpedestrian – a selling point is that it fits exactly like a wheel, and requires no other installation activity required apart from charging. The city of Copenhagen also contributed to development, hence the name, as did the Italian Governemnt and Ducati Energia.
The wheel determines how much pedalling effort the rider is making through a torque sensor, and adds 3-10x more power depending on the assistance level set by smartphone (iOS or Android) over Bluetooth LE.
“All actuation of the wheel happens automatically via the pedals through sensing and control algorithms. When the rider pedals harder, such as when going uphill, the wheel pushes with increasing power,” said the firm, which is now taking orders.
Regenerative braking puts energy back into the battery, range is up to 50km, and top speed is 20mph in the US and 25k/h in the EU.
For the cycling minded:
- Single speed versions with 120 or 135mm dropout
- 7/8/9/10 speed free hub for 135mm dropout
- 700C or 26inch
- Rim braking (and regenerative)
- 5.9kg weight
For the tech minded:
- The app allows the wheel to be locked and unlocked, and tracks time, distance, calories burned and elevation climbed.
- There is a Copenhagen Wheel SDK enabling “a host of applications ranging from navigation to customising the behaviour of the wheel.
Motor, D-shaped battery, controller and… another bit
There is a paper which describes early work on the Copenhagen Wheel.
from News http://ift.tt/1sXdSJv
via Yuichun
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