These vary from normal CVTs in that they're run by an electric motor in addition to the engine, often utilizing planetary gears to mix their outputs in lieu of a belt used in classic CVTs. A notable example would be the Toyota Hybrid Synergy Travel. The CVT gearbox was 1st https://gearboxcvt47901.blogdun.com/33334564/gearbox-cvt-no-further-a-mystery