Patent ID: 6910981

Claim:
A hybrid transmission, comprising: a two-degree of freedom differential unit constituted by a single pinion planetary gear set and a double pinion planetary gear set holding a carrier in common to the single pinion planetary gear set and having five rotary members from among which, when revolution states of two rotary members are determined, those of the other rotary members are determined; an input end of the hybrid transmission from a prime mover that is coupled to a ring gear of the double pinion planetary gear set; an output end of the hybrid transmission to a drive system that is coupled to the common carrier; a first motor/generator that is coupled to a sun gear of the double pinion planetary gear set; a second motor/generator that is coupled to a sun gear of the single pinion planetary gear set; and a brake enabled to brake a ring gear of the single pinion planetary gear set, wherein, during the stop of an output revolution in a case where only a revolution from at least one of the first and second motor/generators is under a forward revolution output state, the brake is activated.