Patent ID: 7140991

Claim:
A shift control system, comprising: a continuously variable transmission having a primary pulley and a secondary pulley drivingly connected to the primary pulley by a belt; a shift actuator that regulates an oil pressure supplied to either of the primary and secondary pulleys to continuously vary an actual transmission ratio of the transmission; and a control unit that controls the shift actuator, the control unit being configured to: set a target transmission ratio in a first mode using a shift pattern within a normal driving ratio control region when a normal driving range is selected and in a second mode using a shift pattern within an engine braking ratio control region when an engine braking range is selected; drive the shift actuator so as to adjust the actual transmission ratio to the target transmission ratio; determine a delay time to delay the setting of the target transmission ratio in the second mode at the time of range switchover from the normal driving range to the engine braking range; and hold the target transmission ratio set in the first mode until the delay time has elapsed from the range switchover.