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Notes -
Worth noting for those who don't know that CVT and ECVT are totally different things. A CVT on a non hybrid car is a mechanical variable ratio pulley system, and these have had reliability issues of the type you mentioned. Hybrid vehicles instead use a system of dual electric motor generators, which, by varying the power or load, can operate as a planetary gear with variable ratio.
It's quite a clever technology, actually - having a single planetary gear with the motor generators allows you to delete multiple other planetary gears, the reverse gear, the starter, the alternator, and the torque converter.
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