Patent ID: 7389168

Claim:
A speed ratio control apparatus for a hybrid transmission, the hybrid transmission having a two-degree-of-freedom differential mechanism, the differential mechanism having at least four rotational elements to each of which an engine, a first motor/generator, a second motor/generator, and an output member are coupled separately, the speed ratio control apparatus comprising: a speed ratio manipulated variable calculating section that calculates a speed ratio manipulated variable on the basis of a deviation between a speed ratio representative command value and a speed ratio representative actually measured value; a speed ratio purpose component command value calculating section that calculates a speed ratio purpose component command value of a torque on each drivingly input element which is drivingly inputted to the differential mechanism according to the speed ratio manipulated variable calculated by the speed ratio manipulated variable calculating section, an acceleration ratio of each of the engine, the first motor/generator, and the second motor/generator in a shift motion, and an inertia of each of the engine, the first motor/generator, and the second motor/generator in the shift motion; and a speed ratio control command outputting section that outputs the calculated speed ratio purpose component command value to a torque actuator of each of the engine, the first motor/generator, and the second motor/generator.