Control device for belt-type continuously variable transmission

Abstract

Provided is a control device for a belt-type continuously variable transmission, the control device being capable of suppressing a deterioration in fuel consumption. Compared to the friction coefficient ([mu]1) of an inside portion in the radial direction of each tapered surface of a driven pulley (7), the friction coefficient ([mu]2) of an outside portion is formed smaller, and the present invention is provided with a gear change range setting means for increasing the frequency of changing the change gear ratio using the inside portion when a gear change control mode for improving energy consumption efficiency is selected.

Description

technical field [0001] The present invention relates to a control device of a belt-type continuously variable transmission, which performs power transmission through a transmission belt wound between a driving pulley and a driven pulley, and continuously changes the transmission ratio by continuously changing the winding radius of the transmission belt . Background technique [0002] This belt-type continuously variable transmission is constituted by changing the groove width of the pulley around which the belt is wound, changing the radius of the belt around which the gear is wound, and setting the transmission ratio steplessly. force to transmit torque. Transmission belts can be broadly classified into metal belts, which are formed by bundling a plurality of metal sheets called members or blocks, for example, with steel belts, and non-metal belts, which are made of, for example, rubber, Mainly composed of resin and the like. In a non-metallic belt, rubber, resin, etc. a...

AI Technical Summary

Problems solved by technology

[0006] In order to achieve the above object, in the control device of the belt type continuously variable transmission of the present invention, the driving pulley and the driven pulley are respectively composed of a fixed pulley integrated with the rotating shaft and a movable pulley capable of moving along the axial direction of the rotating shaft. A transmission belt is wound between the tapered surfaces formed on the facing surfaces of these pulleys, and the gear ratio is continuously changed by moving the movable pulley in the axial direction to change the gear ratio of the vehicle. The torque generated by the driving force source for traveling, the control device of the belt type continuously variable transmission has a plurality of shift control modes including energy consumption efficiency improvement for improving the energy consumption efficiency of the driving force source The change of the transmission ratio can be controlled according to any one of the transmission control modes selected from these transmission control modes, and the control device of the belt type continuously variable transmission is characterized in that it is formed as the The friction coefficient of the radially outer portion of each tapered surface of the driven pulley is smaller than the friction coefficient of the radially inner portion of each tapered surface of the driven pulley, and the control device of the belt type continuously variable transmission has a speed change range setting A gear range setting unit that increases the frequency of changing the gear ratio using the inner portion when the gear control mode for improving energy consumption efficiency is selected.

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