Mode switch control apparatus and method for hybrid transmission

A mode switch control apparatus for a hybrid transmission, the hybrid transmission including:

• a differential unit by means of which an engine, an output axle, and at least one motor/generator are mutually linked;
• a clutch by means of which first predetermined revolutional elements of the differential unit are mutually coupled;
• and
• a brake by means of which second predetermined revolutional elements of the differential unit are fixed and the hybrid transmission being selectable between a low mode which is suitable for a continuously variable transmission in a low side gear area and a high mode which is suitable for the continuously variable transmission in a high side gear ratio area, an output torque of the motor/generator being changed along with a polarity reversal in the motor/generator from a torque required in the low mode to a torque required in the high mode during a mode switch from the low mode to the high mode in a state in which an engine output torque and a transmission output axle torque are substantially invariable, the mode switch control apparatus performing a mutual interlocking control for both of a rise in a transmission torque capacity of one of the clutch and brake which is switched from a release state to an engagement state during the mode switch from the low mode to the high mode to select the high mode and the torque change in the motor/generator along with the polarity reversal.