SPEED CHANGE CONTROL SYSTEM FOR VEHICLES

摘要

A speed change control system for reducing shift shocks of clutch-to-clutch shifting is provided. The control system is applied to a vehicle in which a transmission having a plurality of engagement devices is connected to an output side of a prime mover, and in which a gear stage of the transmission is shifted among a plurality of stages by changing engagement states of the engagement devices. The speed change control system is configured to carry out a clutch-to-clutch shifting of the gear stage from a predetermined gear stage to another gear stage by gradually reducing a torque capacity of the predetermined engagement device to be disengaged while gradually increasing a torque capacity of another engagement device to be engaged. The speed change control system is comprised of a torque calculation means that calculates a target torque capacity of the engagement device to be engaged during a torque phase and an inertia phase under the clutch-to-clutch shifting, based on a target input angular acceleration of the transmission, a target output angular acceleration of the transmission, a target torque capacity of the engagement device to be disengaged, and a target output torque, and configured to change the target torque capacity of the engagement device to be disengaged continuously from the torque phase to the inertia phase under the clutch-to-clutch shifting.

主权项

1. A speed change control system, that is applied to a vehicle in which a transmission having a plurality of engagement devices whose torque capacities are changed continuously is connected to an output side of a prime mover, and in which a gear stage of the transmission is shifted among a plurality of stages by changing engagement states of the engagement devices, and that is configured to carry out a clutch-to-clutch shifting of the gear stage from a predetermined gear stage to another gear stage by gradually reducing a torque capacity of the predetermined engagement device to be disengaged while gradually increasing a torque capacity of another engagement device to be engaged, comprising:
a torque calculator that calculates a target torque capacity of the engagement device to be engaged during a torque phase and an inertia phase under the clutch-to-clutch shifting using a common arithmetic expression, based on a target input angular acceleration of the transmission, a target output angular acceleration of the transmission, a target torque capacity of the engagement device to be disengaged, and a target output torque; and wherein the target torque capacity of the engagement device to be disengaged is changed continuously from the torque phase to the inertia phase under the clutch-to-clutch shifting.