Acceleration

After initial setup and instrumentation, the battery is checked to make sure it is charged to 100% and battery voltage is recorded. The ebike is then ridden on zero assist to a nearby flat stretch of asphalt paved rail trail. There, it undergoes acceleration testing, where several are made for each acceleration type (throttle, zero effort pedaling, 100 watt pedaling, 200 watt pedaling) with an even number of runs performed in each direction.

For the throttle only accelerations, the throttle is placed at maximum from a dead start and the ebike is allowed to reach it’s maximum throttle assisted speed. If the ebike has a cadence sensor, acceleration to maximum assisted speed is measured while spinning with zero load and the PAS set to max. If the ebike has a torque sensor, acceleration is measured while pedaling as lightly as possible.

Acceleration is also measured while averaging 100 watts of pedaling at an average cadence of 80 rpm, and then finally with an average 200 watts of pedaling at an average cadence of 80 rpm. Results are calculated from the 20 Hz GPS unit and the power pedals. The acceleration times for each are reported as a single average along with the average power and cadence as appropriate. Runs are repeated as necessary to achieve the desired power and cadence. Shifting is performed as needed to meet the target power and cadence.

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