Miami traffic, we were able to use the regenerative braking
Due to the extreme braking requirements of the race track,
we blend friction braking with regenerative braking.
type of driving is a big influence on how much energy is reused
through regenerative braking. Any driving that uses the brakes
more, will offer more opportunity to recover energy.
get an idea of the optimum effectiveness we could expect from
the regenerative braking system of the Electric Imp, we did
a series of test runs where the car would:
accelerate from a stop [at a fixed current limit of 50 amps]
to around 30 MPH, then
2) immediately regenerative brake [at a fixed current also
50 amps] back to a dead stop.
low speed was chosen to minimize the effect of aerodynamic
drag. The test was done on a flat windless road and repeated
in both directions.
we totaled the Watt-hours out, from the battery pack accelerating
and the Watt-hours that went back into the battery pack, from
the regenerative braking, we recovered around 25% of the energy.
696 feet, 80.5 W-hrs out, 22.5 W-hrs back from regen, so 58
W-hrs total used. Since there are 5,280 feet in a mile, the
distance was about 0.128788 of a mile. That means 625 W-hrs
per mile, 450 W-hrs per mile with regen.
might conclude erroneously that regenerative braking is only
able to capture 25% of available energy.