| Electric Vehicles (Pure
electric vehicles) |
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The big difference between electric vehicles (EVs) and vehicles
powered by the internal combustion engine is the drive train. The
drive train of EVs does not have an engine in the conventional sense
of the word or a fuel tank. Instead, EVs have a drive motor and battery
system. Another distinguishing feature of EVs is their flexible drive
train source.
ISO DIS 8713 (Electric road vehicles - Terminology; DIS (Draft Internal
Standard)) specifies the terms used for EVs. Figure 1 labels the standard
components of EVs and defines their relationship to each other. Components
with an asterisk are the Japanese translations of equivalent terms
defined in ISO DIS 8713. The translation is from JEVS Z 805. JEVS
is an EV standards organization set up by the Japan Electric Vehicles
Association (JEVA). These standards were published as JIS in July,
2000.
As well as considering compatibility to terms used for vehicles powered
by the internal combustion engine, these standards also cover the
names associated with common terms and functions used currently. As
the figure shows, the bundle of components consisting of the traction
system is highly complex. For example, the power system and power
train include a power unit showing the motor and its control device.
The drive systems of electric vehicles are
--- an onboard energy source composed of a battery and onboard charger
--- a power source unit composed of a motor and control device that
generates power mechanically
--- a drive train to transmit power to the wheels.
These characteristics of drive systems affect the three above-mentioned
elements and the following four charging onboard energy sources.
--- the charging method
--- the onboard energy source
--- the power unit
--- the drive train.
Figure 1 Standard component of electric vehicles
Reference
Book title: EV Handbook
Written by: EV Handbook Publisher's Group
Published by: Maruzen Co., Ltd. (URL http://www.maruzen.co.jp)
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