Difference between HEV and PHEV
HEV regenerates energy which had been disposed as
heat energy. By doing so, petroleum energy
consumption is reduced. This way, fuel (petroleum
energy) consumption can be reduced. On the other
hands, PHEV can replace the petroleum energy with
electricity energy. With PHEV, electric energy is supplied
from external sources not limited to petroleum energy. It
will be converted into drive power by electric motor.
Whereas conventional vehicles with an internal
combustion engine or HEVs were supplied only by
petroleum energy, it is partially replaced by electric
energy. A Plug-in HEV is not just a vehicle with a power
code (external charging function). The vehicle utilizes a
new energy source (electric energy).