Controller for vehicle transmission

摘要

A controller for a vehicle transmission in which a continuously variable transmission mechanism able to continuously change its speed ratio and a transmission mechanism having a constant speed ratio are provided in parallel between an input shaft and an output shaft. The transmission includes a friction engagement mechanism and an intermeshing engagement mechanism, the intermeshing engagement mechanism being arranged in series with the friction engagement mechanism, the intermeshing engagement mechanism setting the transmission mechanism to a state where torque is transmittable between the input and output shaft, in changing to a state where the intermeshing engagement mechanism is engaged and the transmission mechanism is able to transmit torque to the output shaft, a torque capacity of the friction engagement mechanism is configured to be increased to a torque capacity to such extent that the transmission mechanism rotates without a delay of start of engagement of the intermeshing engagement mechanism.

主权项

1. A controller for a vehicle, the vehicle including:
a continuously variable transmission mechanism, a transmission mechanism, the continuously variable transmission mechanism and the transmission mechanism being provided in parallel with each other between an input member to which torque is transmitted from a driving force source and an output member that outputs torque to a drive wheel, a friction engagement mechanism configured to transmit torque from the input member to the transmission mechanism, the friction engagement mechanism including a mechanism of which a torque capacity increases with a hydraulic pressure that is supplied to the mechanism, an intermeshing engagement mechanism arranged on a downstream side of the friction engagement mechanism in a direction in which torque is transmitted from the input member toward the output member, the intermeshing engagement mechanism being configured to set the transmission mechanism to a state where torque is transmitted between the input member and the output member, and a shift mechanism configured to select between a neutral state where torque output from the driving force source is not transmitted to the drive wheel and a drive state where a predetermined speed ratio is set, the controller comprising: an electronic control unit configured to: (a) in changing from a state where both the friction engagement mechanism and the intermeshing engagement mechanism are released and the transmission mechanism is not able to transmit torque to a state where the intermeshing engagement mechanism is engaged and the transmission mechanism transmits torque to the output member, start engaging the intermeshing engagement mechanism after a torque capacity of the friction engagement mechanism is increased to a torque capacity that rotates the transmission mechanism; (b) carry out an increase in the torque capacity of the friction engagement mechanism by increasing the torque capacity of the friction engagement mechanism for establishing the drive state as a result of selection of the drive state by the shift mechanism; and (c) set a hydraulic pressure for setting the torque capacity that rotates the transmission mechanism based on at least one of a rotation speed of the transmission mechanism or an oil temperature.