Browse Publications Technical Papers 2000-05-0353
2000-06-12

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.

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