If you service
and repair automobiles get ready for Hybrid
Electric Drive Vehicles, abbr. HEVs. They are here now.
New car manufacturers
are producing HEVs. Honda began with the Honda Accord
and Honda Civic. Toyota has the Toyota Prius, Camry, and Highlander,
Lexus the RX400h and GS450h, Ford the Escape and Mercury the
Mariner. These manufacturers have HEVs in the showroom
now and other manufacturers are bringing HEVs to their showrooms.
Consumers can expect to get about 40-50 mpg in city driving with
some models and without sacrificing performance while greatly
reducing emissions. HEV technology in vehicles today are very fuel
efficient and generate very low emissions. Vehicle manufacturers are incorporating HEV technology in some
vehicle platforms which provide only a 10-12% improvement in
fuel economy. So why go with electric drive technology for only
a 10-12% increase in mpg?
The reason is that a car manufacturer
can use a smaller gasoline engine for vehicle cruising and handling
light vehicle loads (for better mpg and low emissions). But when
more power is needed to accelerate from a stop, go up a hill,
pull a trailer or pass on the highway, the smaller gasoline engine
might need a little help to meet the driver's performance expectations.
Then an electric drive motor, powered by a NiMH battery pack,
automatically kicks in to temporarily boost vehicle power and
performance by assisting the gasoline engine.
The driver gets the performance boost he needs but only when
he needs it. Meanwhile the vehicle operates with a smaller gasoline
engine for better mpg during normal driving. To further cut emissions
and improve fuel economy an HEV can be programmed to shut off
its engine at a stop light and start moving again on electric
drive motor power using high voltage battery technology till
the gasoline engine starts back up when reaching its optimum
torque range and takes over.
The gasoline engine is also used to recharge the battery pack
so it's always near full charge as well as employing regenerative
braking which translates the braking energy of the HEV into energy
to recharge the battery pack. These are just a few of the interesting
features that makes HEV technology a viable option.
in power electronic components (solid-state components that can
safely handle several hundred amps) and advanced AC or DC electric
drive motors, computer control and programming makes switching
power between the gasoline engine or electric drive motor appear
to be seamless to the driver.
A vehicle with some form of HEV technology will become as common
as a car or pickup with only a gasoline engine is today. It is
estimated that in a few years there will be over one million
hybrid electric drive vehicles on the road and more coming every model year. Expect a dramatic
rise in HEV vehicles beyond these industry predictions.
Are you ready
for this new service opportunity? Vince Fischelli has written
a training manual called "Essential AC Electric Theory and Basic
Circuits of Hybrid Electric Drive Vehicles." Over 100 pages covering essential
AC electric theory with schematic diagrams you need to understand
the electrical/electronic circuits of HEVs which are different
from typical gasoline cars and light trucks.
Begin now reading about this new HEV technology and get a head
start. Over 75 diagrams and schematics are used to illustrate
various circuits and operating concepts to help you grasp HEV
circuit technology. Lot's of HEV technology on the horizon.
this HEV training manual covers:
AC electrical theory is a lot different from DC electrical theory.
Therefore the first section of the manual is a fairly in depth
discussion of AC electric theory as opposed to DC electric theory.
For example, in AC circuits, current flows in two directions
at different times, not one direction all the time as in DC circuits.
Learn why AC current can flow when AC voltage is zero. This is not possible
in DC circuits.
In AC circuits AC current is out-of-phase with
AC voltage (current lags voltage or voltage lags current at certain
times) which makes AC circuits a lot more difficult to understand
Yes, AC electricity is a lot different from DC electricity
in the way it behaves. This new manual by Vince covers these
concepts and more. How about 3-Phase AC. Do you know how it works?
You should because most hybrid electric drive motors are 3-Phase.
After you have read about AC electrical theory in this training manual
by Vince, it goes into DC/DC Converters. This is the schematic for a common DC-DC Converter that converts 42 Volts to 14 Volts to control 12 V lamps from a 42 volt battery pack. Then there are high voltage battery
packs, the high power electronic circuits of electric drive motors,
electric motor assist and regeneration of battery pack charge
using an HEV's kinetic energy.
Explanations are keyed to the Honda Insight and Civic and Toyota's Prius. These HEVs
are already on the road. You can order Vince's new HEV training
manual and get started learning about the hybrid electric drive
revolution coming in autos, SUVs and light trucks.