Abstract: A ring disk reciprocating power conversion device includes a planetary gear set and at least one eccentric control panel set. The eccentric control panel set includes a rotary disk pivoted on the opposite end of the planetary gear set, which can be guided by the rotation of the plurality of planet wheels of the planetary gear set, forcing the rotary disk to do a reciprocating movement in limited amplitude. The periphery of the rotary disk forms annular chambers. The annular chambers accommodate a pressure forming medium. More than one variable volume chambers are formed in the annular chambers, and the periphery of the rotary disk is provided with a plurality of spacers which has equal quantities as that of the variable volume chambers. The spacers can press or draw the medium and further regulate and stop the rotation of the planet wheel.

Abstract: During a period in which a clutch is in a partially engaged state at the time of start of a vehicle, a transmission ECU calculates load acting on the clutch (clutch-absorbed energy). When this load is large, generation of a shift signal based on a gear shift map is prohibited, and the initial gear position is held. The clutch-absorbed energy is obtained through integration of the product of clutch transmission torque and the difference between rotational speed of an engine and rotational speed of the clutch. The clutch transmission torque is determined with reference to a clutch transmission torque map provided in the transmission ECU.