CONTROL DEVICE FOR CONTINUOUSLY VARIABLE TRANSMISSION

摘要

A frictional engagement element (32) that disconnects power between an engine (1) and a drive wheel (7) in a vehicle, and a control unit (11, 12) that controls a transmission ratio of a continuously variable transmission (4) and the frictional engagement element (32), are provided. When the transmission ratio is not a maximum transmission ratio at a vehicle stop when a vehicle speed is 0, the control unit (11, 12) operates the transmission ratio to the maximum transmission ratio while controlling the frictional engagement element (32) into a slip state. Further, at this time, when a road is an upward slope, the control unit (11, 12) sets an engagement pressure of the frictional engagement element (32) and an engine torque according to the road slope, prevents slide-down of the vehicle.

主权项

1. A control device for a continuously variable transmission mounted between an engine and a drive wheel in a vehicle and having a continuously variable transmission mechanism and a frictional engagement element that is installed at an output section, which leads to the drive wheel, of the continuously variable transmission and disconnects power, the control device controlling a transmission ratio of the continuously variable transmission mechanism and the frictional engagement element, the control device comprising:
a vehicle speed detection unit that detects a vehicle speed of the vehicle; a transmission ratio detection unit that detects the transmission ratio; and a control unit that judges, on the basis of detection vehicle speed information from the vehicle speed detection unit, whether or not the transmission ratio detected by the transmission ratio detection unit is a maximum transmission ratio at a vehicle stop when the vehicle speed is 0, and when the detected transmission ratio is not the maximum transmission ratio, performs a Low-return control that operates the transmission ratio to the maximum transmission ratio while controlling the frictional engagement element into a slip state.