VARIABLE SPEED CONTROLLER OF AUTOMATIC TRANSMISSION

摘要

When two friction engagement elements are disconnected and connected and they are down-shifted to a variable speed stage two or more stages apart via an intermediate stage, a variable speed control means controls the torque capacity of a first variable speed engagement element to be sufficiently higher than a change quantity of torque capacity of a second variable speed release element with an increase of the torque capacity of the second variable speed release element while feedback-controlling the oil pressure of the second variable speed release element. Thus, the control means can effectively suppress a drawback where sufficient reaction cannot be secured at the time of exchanging due to lack of torque capacity of the first variable speed engagement element, feedback control of the second variable speed release element cannot appropriately be performed, control of a rotation change becomes difficult and a variable speed shock occurs.