An assessment of flywheel energy storage for electric vehicles.
The alternative components in an electric/flywheel propulsion
system are reviewed, including different continuously variable
transmissions (CVT's), and a new arrangement is proposed for electric
vehicles, called the "Sussex propulsion system".
Computer simulations are developed which show the effects of
using flywheel energy storage, as opposed to electrical regenerative
braking, for a large urban delivery van, which originally incorporated
an electronically-controlled motor. Vehicle performance and energy
consumption are compared over different driving cycles, and the result
of varying the flywheel energy capacity is shown.
The design and operation of an experimental rig is described
and the experimental results are compared with those obtained from a
computer simulation,, in order to test the validity of the mathematical
The results show that for urban use, an electric delivery van
fitted with the Sussex propulsion system has a substantially reduced
energy consumption and better performance than a comparable conventional
electric vehicle. Therefore, an electric vehicle in the future would
require a smaller, cheaper installed battery pack or would have a
greater range between recharging.