| 摘要 |
A control device for controlling a continuously variable transmission ( 5 ) is disclosed. The control device has an oil pressure control unit ( 100 ) which supplies an oil pressure to a primary pulley ( 10 ) and secondary pulley ( 11 ) based on a command signal indicative of a target speed-reduction ratio, a sensor ( 26 ) which detects a rotation speed (Np 1 ) of the primary pulley ( 26 ), and a controller ( 20 ) which transmits the command signal indicative of the target speed-reduction ratio to the oil pressure control unit ( 100 ). The controller is programmed to set the target speed-reduction ratio to a first speed-reduction ratio (R 1 ); calculate a first predetermined rotation speed (N 1 ) of the primary pulley at which the V-belt reaches a first limiting temperature (T 1 ) at the first speed-reduction ratio (R 1 ); calculate a first elapsed time after the detected rotation speed (Np 1 ) of the primary pulley exceeds the first predetermined rotation speed (N 1 ); maintain the first speed-reduction ratio (R 1 ) when the first elapsed time is equal to or less than a first predetermined time; and set the target speed-reduction ratio to a second speed-reduction ratio (R 2 ) smaller than the first speed-reduction ratio (R 1 ) when the first elapsed time exceeds the first predetermined time. At the second speed-reduction ratio (R 2 ), the temperature of the V-belt should become equal to or less than the first limiting temperature (T 1 ) throughout the permitted rotation speed region of the primary pulley. Thus, starting acceleration performance of the continuously variable transmission is enhanced.
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