| 摘要 |
PURPOSE:To promote the prevention of a belt slip and the sureness of a speed change speed by controlling a speed change ratio controlling oil chamber so as to obtain the higher of the speed change oil pressure or minimum oil pressure while increasing a pressure of oil in a load thrust controlling oil chamber when necessary. CONSTITUTION:Two or more control valves 43, 45 respectively control each oil pressure in each speed change ratio and load thrust controlling oil chamber respectively provided in each pulley 12, 14 in drive and driven sides of a continuously variable transmission 10. While a means 80 determines a target value of engine speed or speed change ratio, further a means 81 determines a speed change oil pressure of the speed change ratio controlling oil chamber in accordance with a deviation of the target value from the actual value. While each means 82, 84 respectively determines a minimum oil pressure in the speed change ratio controlling oil chamber and a load oil pressure in the load thrust controlling oil chamber. A means 83 outputs a signal, controlling the oil pressure in the speed change ratio controlling oil chamber to a predetermined higher side, to the control valve 43, further a means 85 outputs a signal, increasing the oil pressure in the load thrust controlling oil chamber larger than the load oil pressure, to the control valve 45.
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