A Study on a Developed Electro-Mechanical Epicyclic Power-Drive (EMEC) for Hybrid Electric Vehicles (HEV)

Abstract

Hybrid electric vehicles (HEV) draw much attention during the last years due to the need
for alternative power resources with reduced emissions. The major disadvantages of HEV are
the heavy weight, high cost and complicated control strategies. This paper focuses on a
developed design for electro-mechanical differential unit. Most designer uses differential
block as a mechanical linkage between two power sources. In this paper the differential unit is
modified to do more than linkage. It acts as a continuously-varying-transmission (CVT),
electric motivation unit and power regeneration unit. This of course leads to more compact
and light weight vehicles. The developed model uses three main units: Synchronous block,
Differential block, and Induction block the three blocks are combined in a compact design.
Mechanical-electrical power transformation is carried out through the synchronous block
which acts also as regeneration unit during braking. On the other hand electrical- mechanical
transformation is carried out through the induction unit. The differential unit plays the role of
smart linkage between the synchronous and the induction units. Simulation through Matlabsimulink
is
carried
to
show
the
validity
of
the
model.
The
developed
model
proved
to
satisfy

the
properties
of
CVT
and
driving
demands
torques