Shuangye ebike
FIRST GENERATION: THROTTLE
The simplest way to operate an ebike is with a throttle. Since it is so simple, it has been around the longest. Twist a lever or push a button and the bike goes. Let go and it stops. It’s simple, it works, but it can leave something to be desired as the interface is more like a scooter than a bike. On longer rides, the act of twisting or pushing a throttle every time you want power can become tiresome, and so throttle bikes are more and more being phased out in favor of pedal operated assist systems.
SECOND GENERATION: CADENCE SENSOR
A cadence sensor is like a throttle operated by your feet. The design is simple: a magnet is attached to pedals and a sensor picks up the movement of the magnet as you pedal. Start pedaling and the sensor tells the motor to turn on. Cadence sensors are more intuitive than a throttle, but have severe limitations. The ride can feel jerky, since the moment you start pedaling the motor wants to turn on at full power. Head up a hill and as your pedaling slows down, the cadence sensor tells the motor to give less power when what you need is more. All in all, a cadence sensor, while slightly more sophisticated than a throttle, is still far from an intuitive and elegant solution.
THIRD GENERATION: TORQUE SENSOR
The best electric bikes are the ones that form a seamless hybrid between your pedaling and the motor. The only way to make that happen is to have a torque sensor. Torque sensors measure how hard you are pressing on the pedals, and tell the motor how much to turn on based on pedal pressure. Head up a hill and the torque sensor knows you’re working harder and tells the motor to chip in. The true magic happens when a torque sensor is combined with a speed and cadence sensor. This trio is able to give the motor controller a complete picture of how you are riding so that it can give power in just the right amount at just the right time.
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