[PARALLEL OPERATION] 1
Speaker: Seeing how the parallel configuration is
similar to non-hybrids was pointed out
in the configuration video. The next
step is to compare the modes of
Speaker: The first mode of operation for a
parallel configuration HEV is called the
“electric only” operation.
Speaker: As described before, this is the most
fuel-efficient mode because the IC
engine is not used at all, but unlike the
series configuration if the electric
motor is too small this mode may not be
possible because of power demands,
which will be described shortly.
Speaker: The battery pack sends the electrical
signal to the power inverter, which
converts it into a form the motor can
[PARALLEL OPERATION] 2
Speaker: When the motor receives this power, it
then drives the wheels to propel the
vehicle down the road.
Speaker: This version of the parallel
configuration is called a “full hybrid”
version. If it was a “mild hybrid”
version, then the motor would be less
powerful and would not be able to drive
the vehicle without assistance from the
Speaker: The next mode only uses the IC engine
Speaker: This mode is how standard non-hybrid
vehicles drive today.
Speaker: The IC engine sends mechanical power
to the transmission. The power is then
directed to the set of gears that will
propel the vehicle.
[PARALLEL OPERATION] 3
Speaker: Whether the parallel configuration is a
“full” or “mild” hybrid, the mode that
both versions utilize is having the IC
engine and motor power the vehicle
Speaker: The battery sends electrical power to
the motor, which is transformed to
mechanical power output.
Speaker: At the same time the IC engine
generates mechanical power and sends
it through the transmission.
Speaker: Both of these power sources then turn
the final gear set to transport the
[PARALLEL OPERATION] 4
Speaker: Similar to the series configuration,
when the vehicle slows down, it will
gain energy back through regenerative
Speaker: This power is sent to the inverter, which
then converts it back into a form the
battery pack can store for a later time.
Speaker: The blue arrows show the power path
that can send power both ways, and the
red arrows show the path where power
can be transferred in only one direction.
Speaker: The main difference from a non-hybrid
vehicle, besides the electric motor and
battery, is that the IC engine is smaller
than a standard vehicle of that size.