Transmission controller for continuously variable transmission system

Abstract

The invention provides a variable speed control device of a variable speed case, which leads the variation ratio to stably return to a low ratio side even after a belt pulley at a driving side stops when in emergency deceleration, and has good production efficiency. The variable speed control device comprises a control unit. A vehicle speed sensor detects the emergency deceleration of a vehicle body (in step S2); after a belt pulley revolution transmitter detects that the belt pulley at the driving side stops (in step S4), when a variation ratio sensor detects that the variation ratio of the variable speed case does not return to the low ratio side which can obtain fully accelerating when restarting (in step S7), and then the control unit drives an actuator, so as to lead a moveable belt pulley half body at the driving side to move to the position of the low ratio side (in step S7). In addition, when the control unit detects a restarting intention of a hitching people according to a detecting signal from an air damper opening degree sensor (in step S12), the moveable belt pulley half body at the driving side is pressed towards a V-shaped transmission belt by the actuator (in step S13), and thus the slippage between the moveable belt pulley half body at the driving side and the V-shaped transmission belt is avoided, and the transmission loss of driving force is decreased when restarting.

Description

technical field [0001] The present invention relates to a speed change control device for a continuously variable transmission, and more particularly to a speed change control device for a continuously variable transmission capable of stably returning the speed change ratio to the low ratio side even after the drive side pulley stops rotating during sudden deceleration. Background technique [0002] As a conventional transmission mechanism that transmits the driving force of the engine to the driving wheels through the belt type continuously variable transmission, a centrifugal starting clutch is provided on the output side (driven side). According to this transmission mechanism, the torque transmission between the driving wheels and the continuously variable transmission can be disconnected when the vehicle is stopped in an emergency, so that the transmission ratio of the continuously variable transmission can be shifted to the low transmission ratio side (low ratio side) by...

AI Technical Summary

Problems solved by technology

[0006] However, the technology of the above-mentioned Patent Document 1 has a problem that the gear ratio of the continuously variable transmission cannot be returned to the low ratio side when the crankshaft of the engine is less than a predetermined rotational speed and the rotation of the drive side pulley is stopped.

In addition, it is necessary to have controllable clutches on the input side and the output side of the continuously variable transmission, and the structure is complicated, and the weight and assembly man-hours increase.

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