DEVICE AND METHOD FOR HYDRAULICALLY CONTROLLING CONTINUOUSLY VARIABLE TRANSMISSION FOR VEHICLE

摘要

This continuously variable transmission for a vehicle is provided with a transmission controller (12) for shifting gears in a variator (20) and an auxiliary gearshift mechanism (30), a line pressure regulating valve (11a), a primary pressure regulating valve (11b), and a secondary pressure regulating valve (11c). The transmission controller (12) is provided with a line pressure control unit (fig. 4) that, when oil vibration occurs in the actual oil pressure at the primary pressure (Ppri) and/or secondary pressure (Psec), the line pressure (PL) is caused to exceed the line pressure (PL) before oil vibration occurred. The line pressure control unit (fig. 4) continues to increase the line pressure (PL) until gear shifting in the auxiliary gearshift mechanism (30) concludes in order to yield stable gear shifting when the gears are shifted in the auxiliary gearshift mechanism (30) with the line pressure (PL) in an increased state.