Hybrid
Propulsion Subsystem
A
hybrid propulsion subsystem joins two types of propulsion
mechanisms so that the advantages of each can be exploited.
Such a system generally consists of two energy storage elements
(such as a liquid fuel and an electric battery) and two energy
conversion elements (such as an engine and an electric motor).
In a parallel hybrid, the electric motor and the engine can
apply torque to the wheels either simultaneously or individually.
In a series hybrid, only the electric motor can apply torque
to the wheels. Propulsion power flows through a single path
from engine to the generator, to the battery, to the traction
motor, and to the drive wheels.
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