Contiuously variable transmission device

Abstract

The present invention achieves a structure that can secure reliability of a learning value without a greater-than-necessary loss of learning opportunities, even if an ignition switch is turned off during learning related to the step position of a stepping motor that is the baseline of gear ratio control of a toroidal continuously variable transmission. By means of a controller (11), the on / off state of the ignition switch (33) is determined, the execution of learning control is permitted only in the on state, and the execution of learning control is prohibited in the off state. As a result, after the ignition switch (33) is turned off, in the state of the rotational frequency of an engine (1) decreasing, the execution of learning relating to the step position of the stepping motor (24) is prevented. Consequently, mislearning is prevented, and reliability of the learning value can be secured. Also, as learning after the ignition switch is turned off is prohibited, the state of the ignition switch being turned on and the engine rotation being stable does not need to be eliminated from being the subject of learning control, and so learning opportunities are not lost more than necessary.

Description

technical field [0001] This invention relates to an improvement of a continuously variable transmission incorporating a toroidal continuously variable transmission used as an automatic transmission for a generator used in an automatic transmission for vehicles, an automatic transmission for construction machinery, and an aircraft. Background technique [0002] The toroidal continuously variable transmission that is used as an automatic transmission for automobiles is described in Japanese Patent Application Laid-Open No. 2001-317601, "Toroidal CVT" written by Yuhisa Tanaka, Co., Ltd. Corona (Korona Corporation) (July 13, 2000 ) and many other publications, and some of them have been implemented and known. Such a toroidal continuously variable transmission is composed of an input-side disk and an output-side disk whose axial side surfaces facing each other are torus-curved surfaces, and a plurality of power rollers sandwiched between these disks. During operation, the rotati...

AI Technical Summary

Problems solved by technology

In this case, although the frequency of occurrence of the above-mentioned problems can be further reduced, since the idling rotation speed fluctuates due to the temperature of the cooling water of the engine, etc., the engine rotation speed will not increase even when the ignition switch is turned on. Even if the original subject of learning control is not reduced, there is a possibility that the learning permission conditions may not be satisfied, and there may be new problems such as losing learning opportunities more than necessary and reducing the frequency of learning control execution more than necessary. sex

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