STEUERVORRICHTUNG FUER EIN STUFENLOS REGELBARES GETRIEBE.

摘要

A control system for a continuously variable transmission has a spool type transmission ratio control valve (50). The transmission ratio can be controlled by the flow rate of oil supplied to the valve in accordance with a desired transmission ratio so the spool is shifted. The system has a control unit (70) by which the transmission ratio changing speed is controlled to a desired transmission ratio. The control unit (70) determines when the actual transmission ratio does not coincide with the desired ratio in a steady state of an engine, the flow of control oil is corrected so as to reduce the difference between the desired transmission ratio and the actual ratio.