The CMC SyTech engine in the new aXcessaustralia hybrid car 2000-05-0353
The Australian concept car "aXcessaustralia II" is a
serial hybrid car of the so-called "New Generation
Hybrids." Its internal combustion engine drives an electrical
power generator. The wheels are driven by the electrical traction
motor only, which receives its energy from a combination of
batteries, capacitors and the electrical power generator.
In a drivetrain, which consists of a combustion engine, a
generator, a traction motor, two different systems for electrical
energy storage and the necessary electronics to apply the most fuel
efficient power strategy, all components require an extremely high
degree of weight optimization to avoid offsetting the fuel savings
achieved with the system by an increased overall vehicle weight.
They also need to be extremely efficient in themselves.
CMC''s SyTech Scotch Yoke engine contributes its share
of weight savings by being lighter than comparable conventional
combustion engines and by allowing further secondary weight savings
in other vehicle components. All SyTech engines are perfectly
balanced and therefore require much less effort to isolate the
vehicle cabin from engine-originated noise and vibrations. The
output torque is more uniform under all important operating
conditions allowing a lighter drivetrain than required for
conventional piston engines. The small size of SyTech engines makes
them especially suitable for the more complex packaging
requirements in a hybrid car. The low weight of the engine itself
and the lower mass of components and material required to meet the
NVH requirements help to overcome the inherent weight disadvantage
of a complex hybrid system.
Hans G. Rosenkranz, Graham Fountain, James Psonis, Matthew J. Oakley
CMC Research Pty Ltd., CMC Power Systems Ltd.