Known as Flywheel KERS, the set-up is designed to be both lightweight and cheap. Fitted to the rear axle, braking energy causes a 20 centimetre carbon fibre flywheel to spin at 60,000 rpm. The resultant stored energy can then be transferred to the rear wheels via a dedicated transmission.
As the internal combustion engine is switched off during the braking phase, and Flywheel KERS will be able to get the car moving again for a short distance, dramatic reductions in fuel burn are expected. Indeed, it’s reckoned that the internal combustion engine would be idle for around half the time under New European Driving Cycle conditions.
Alternatively, the system could give an acceleration boost in the same way that Formula 1 cars employ their KERS. Used in this way, Volvo estimates it could be worth an extra 80 horsepower.
The testing programme is due to begin during the second half of 2011. If the predicted figures can be realised, Flywheel KERS should be a viable alternative to full hybrid powertrains.
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