Control apparatus for continuously variable transmission

A method of controlling a continuously variable transmission (CVT), the method comprising:

• calculating a target transmission gear ratio according to a driving condition of a vehicle if an automatic shift mode is currently selected, and matching a transmission gear ratio of the CVT to the target transmission gear ratio;
• selecting a transmission gear stage of plural transmission gear stages, a transmission stage of the plural transmission gear stages comprising a fixed transmission gear ratio, if a manual shift mode is selected, and matching the transmission gear ratio of the CVT to the fixed transmission gear ratio of the selected transmission gear stage;
• and
• setting a temporary target transmission gear ratio so that if a difference between a target transmission gear ratio calculated immediately after the mode is switched to the automatic shift mode, and the fixed transmission gear ratio of the transmission gear that has been selected in the manual shift mode immediately before the mode is switched to the automatic shift mode is greater than or equal to a set value, the temporary target transmission gear ratio falls between the target transmission gear ratio and the fixed transmission gear ratio,
• wherein if the temporary target transmission gear ratio is set, then the transmission gear ratio of the CVT matches the target transmission gear ratio stepwise via the temporary target transmission gear ratio during a transition of the mode from the manual shift mode to the automatic shift mode.

A method of controlling a continuously variable transmission (CVT), the method comprising:

• determining whether a mode of the CVT is being switched from an automatic mode to a manual mode;
• determining whether a value of a difference between a current transmission gear ratio and a target transmission gear ratio is greater than a predetermined value if it is determined that the mode is being switched to the manual mode;
• and
• setting a temporary target transmission gear ratio, said temporary target transmission gear ratio being a value between the current transmission gear ratio and the temporary target transmission gear ratio if the value of the difference is greater than the predetermined value and then selecting a closest gear ratio to the current transmission gear ratio, and changing the target transmission gear ratio by less than a guard amount if the value of the difference is less than the predetermined value.