Method for controlling continuously variable transmission and continuously variable transmission system

Abstract

A method for controlling a continuously variable transmission is a control method for controlling in/out of oil to/from a primary oil chamber by using an oil pump provided in an oil passage between the primary oil chamber and a secondary oil chamber. The method includes: a determination step of determining whether a required downshift speed is faster than an allowable value; a position control step of setting a target piston position of the primary oil chamber in accordance with an operating state of a vehicle and performing a position control of a piston of the primary oil chamber based on the target piston position; a hydraulic control step of setting a target oil pressure of the primary oil chamber in accordance with the operating state and performing a hydraulic control of the primary oil chamber based on the target oil pressure; and a feedback setting control step of increasing weighting according to a position feedback control based on the target piston position in the position control step when it is determined that the downshift speed is slower than the allowable value in the determination step and of increasing weighting according to a hydraulic feedback control based on the target oil pressure in the hydraulic control step when it is determined that the downshift speed is faster than the allowable value.

Dependencies are inferred from the claim text.