PROBLEM TO BE SOLVED: To provide a belt type continuously variable transmission capable of precisely controlling a gear ratio. SOLUTION: Differential thrust between a driving pulley and a driven pulley is calculated from a feedback controlled variable based on a difference between a target gear ratio and an actual gear ratio. A correction coefficient is set in accordance with detected supercharging pressure for correcting the gear ratio feedback differential thrust. A gear ratio feedback pulley thrust difference is calculated by multiplying the gear ratio feedback differential thrust by the correction coefficient. Thereby, minimum hydraulic pressure rises to suppress a change in the gear ratio resulting from a change in input torque with supercharging pressure fluctuations while securing hydraulic pressure required to hold the gear ratio and achieve the target gear ratio, resulting in no shifting failure. COPYRIGHT: (C)2007,JPO&INPIT
【課題】変速比を精度良く制御することができるベルト式無段変速機を提供する。 【解決手段】目標変速比と実変速比との差分に基づくフィードバック制御量から駆動プーリと従動プーリとの差推力を算出し、検出した過給圧に基いて変速比フィードバック差推力を補正する補正係数を設定し、前記変速比フィードバック差推力と前記補正係数と乗じて変速比フィードバック用プーリ推力差を算出することにより、過給圧変動に伴う入力トルクの変化に起因する変速比の変化を下限の油圧の上昇で抑制し、また、変速比の保持及び目標変速比を達成するのに必要な油圧を確保するため、変速不良を招くことがない。 【選択図】図1




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    JP-2015140852-AAugust 03, 2015本田技研工業株式会社, Honda Motor Co LtdPulley thrust control device of stepless speed change device