Vehicle transmission controller

摘要

The present invention executes a desired gear shift of an automatic transmission using gear shift modeling even when there are three control inputs to two target gear shift values. Setting torque share ratio as a constraint on the equation of motion for the automatic transmission is suitable for controlling the transfer of engaging unit torque, which is considered to be difficult in variable speed control, and allows solving of the equation of motion. Viewed from a different angle, because the torque share ratio, which represents the torque transfer, has been set as a constraint, any gear shift pattern can be handled with a single gear shift model.

主权项

1. A shift control apparatus for a vehicle including an automatic transmission which comprises a plurality of coupling devices for transmitting a rotary motion and a torque between an input shaft provided to receive a drive force from a drive power source and an output shaft provided to transmit the drive force to drive wheels, and which is configured to be shifted with concurrently performed engaging and releasing actions of the respective coupling devices, said control apparatus being configured to implement a shifting control of said automatic transmission according to a predetermined shifting model for determining manipulated amounts to establish shifting target values, the control apparatus comprising:
a shifting target value calculating portion configured to calculate, as said shifting target values, two values consisting of a torque of an output-side rotary member and a rate of change of a rotating speed of an input-side rotary member, the output-side rotary member being disposed in a power transmitting path from the output shaft to the drive wheels, and the input-side rotary member being disposed in a power transmitting path from the drive power source to the input shaft; a manipulated amount calculating portion configured to calculate, as said manipulated amounts, three values consisting of a torque of the input-side rotary member, a torque capacity of one of the coupling devices which is to be engaged for a shifting action of said automatic transmission, and a torque capacity of another of the coupling devices which is to be released for the shifting action; and a torque assignment ratio calculating portion configured to calculate torque assignment ratios which are ratios of torques to be transferred through the respective coupling devices to be engaged and released for the shifting action.