In a normal hydraulic automatic xmission, there are multiple planetary gear sets linked end to end and different parts are locked in a sequence to change the gear ratios.
This isn’t magic. Instead of locking various parts and having that shift shock and synchronization problem along with only fixed gear ratios, it just uses an electric motor that changes speeds on the other end of one planetary gear set to alter the gear ratio, maintain engine efficiency as well as control the output variably. Much more reliable CVT design than the belt or chain CVT.
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