Patent ID: 7582041

Claim:
A controller for a continuously variable transmission mounted in a vehicle which has an engine and a cruise control system for maintaining a target vehicle speed, said controller comprising: basic speed ratio setting means for setting a basic speed ratio of said continuously variable transmission based on said target vehicle speed; adjustment speed ratio setting means for sequentially setting an adjustment speed ratio of said continuously variable transmission based on a target torque interrelated value which is a value interrelated with a target torque of said engine; and speed ratio control means for controlling said continuously variable transmission so that an actual speed ratio of said continuously variable transmission becomes equal to a target speed ratio obtained by adding said adjustment speed ratio set by said adjustment speed ratio setting means to said basic speed ratio set by said basic speed ratio setting means; wherein said adjustment speed ratio setting means comprises adjustment speed ratio increasing means for progressively increasing said adjustment speed ratio according to an increase in said target torque interrelated value only when said target torque interrelated value is increased and when an operating point determined by said target torque interrelated value and adjustment speed ratio is present on a first operating area, and adjustment speed ratio decreasing means for progressively decreasing said adjustment speed ratio according to a decrease in said target torque interrelated value only when said target torque interrelated value is decreased and when said operating point is present on a second operating area; and wherein, when said operating point is present within a third operating area between said first operating area and said second operating area, said adjustment speed ratio setting means maintains said adjustment speed ratio that is set finally.