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    • 4. 发明公开
    • CONTROL DEVICE FOR CONTINUOUSLY VARIABLE TRANSMISSION
    • EP3273111A4
    • 2018-05-02
    • EP16768163
    • 2016-02-03
    • JATCO LTDNISSAN MOTOR
    • ABE KOSUKETSUKAMOTO SHINTAKAHASHI SEIICHIROTANAKA HIROYASU
    • F16H61/662
    • F16H61/66272B60W2520/28F16H59/40F16H59/42F16H59/66F16H2061/66277
    • A control device for a continuously variable transmission has a first rotation speed sensor detecting a rotation speed of a driving wheel; a second rotation speed sensor detecting a rotation speed of a driven wheel; a wheel speed difference detection unit configured to detect a wheel speed difference between the driving wheel and the driven wheel from a detection value of the first rotation speed sensor and a detection value of the second rotation speed sensor; a bad road judgment unit configured to, when the wheel speed difference is equal to or greater than a first predetermined value, judge that a road on which a vehicle is travelling is a bad road; a first belt clamping force increase unit configured to, in a case where the road is judged to be the bad road, increase a belt clamping force when clamping a belt of the continuously variable transmission by pressure-controlled pulleys as compared with a case where the road is not judged to be the bad road; a vibration detection unit configured to detect a vehicle speed vibration value indicating a vibration of a vehicle speed on the basis of at least one of the detection values of the first rotation speed sensor and the second rotation speed sensor; and a second belt clamping force increase unit configured to, in a case where the road is not judged to be the bad road, when the wheel speed difference is equal to or greater than a second predetermined value that is smaller than the first predetermined value, or when the vehicle speed vibration value is equal to or greater than a third predetermined value, increase the belt clamping force as compared with a case where the wheel speed difference is less than the second predetermined value and a case where the vehicle speed vibration value is less than the third predetermined value. It is therefore possible to suppress belt slip regardless of a road condition.