An automotive powertrain includes a hydraulic drive circuit including at least one of: a hydraulic pump/motor (12) having a shaft fixed to for rotation with the crankshaft of an internal combustion engine (11); at least one accumulator (13,17) and a pair of pump/motors (21,22) coaxially arranged to share a common shaft on which is mounted a gear of a gear set for transmitting output to the vehicle drive wheels (20). Hydraulic control logics are provided for control of the various pump/motors of the hybrid powertrain and of the pumping to the accumulator (13,17).