Patent ID: 8694215

Claim:
A control device for a belt type continuously variable transmission in which a belt is wound around a primary pulley into which a power output by a power source is input and a secondary pulley connected to an output side of a driving system of a vehicle, and an oil pressure supplied to the primary pulley is regulated by driving a step motor, thereby modifying a groove width of the primary pulley and the secondary pulley such that a rotation speed of the power source is output while being varied continuously, comprising: a deceleration detecting unit configured to detect a deceleration of the vehicle; a brake operation detecting unit configured to detect an operation of a brake; and a gear ratio control unit configured to: set a target gear ratio on a basis of an operating condition of the vehicle, control a drive amount of the step motor such that an actual gear ratio converges with the target gear ratio, control the drive amount of the step motor such that a predetermined gear ratio is maintained when the deceleration of the vehicle exceeds a predetermined threshold, determine the predetermined threshold on a basis of the actual gear ratio upon detection of the operation of the brake, and set the predetermined threshold at a larger degree of deceleration as the actual near ratio shifts toward a high side.