Improvements in fuel economy of up to 22.4 percent on the ARTEMIS test cycle (pdf), which represents typical real-world usage, have been demonstrated by a research vehicle fitted with a flywheel hybrid system that includes stop-start technology.
Do your remember the hybrid system that stores braking energy not as electricity but in a rotating flywheel as kinetic energy? Well, the system is going to be mated to a special CVT transmission able to change 6-to-1 ratio within one revolution. That is, in 50 ms, the transmission can go to almost zero to full power.
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