Speed ratio control system for a continuously variable transmiss

Details Speed ratio control system for a continuously variable transmiss Speed ratio control system for a continuously variable transmiss

1986-06-03

1988-05-10

Novosad, Stephen J.

Endless belt power transmission systems or components

Control for variable input to output speed-ratio

474 28, 74856, F16H 1102

Patent

active

047432233

ABSTRACT:
A speed ratio control system for a continuously variable transmission is provided, wherein an oil flowrate to a hydraulic servo of an input or an output V-shaped pulley device is varied by a flow control valve, so that a speed ratio between the input and the output sides can be continuously changed. The system determines a deviation between a target value and a measured value and corrects the measured value in accordance with at least the characteristics of the flow control valve, so that the deviation and a rate of change per unit time of the speed ratio, or the deviation and a rate of change per unit time of a rotational speed of the input or output pulleys, will have a linear relationship over the entire area of control. This system avoids poor feedback gain because of the non-linearity of the characteristics of the flow control valve. Thus, the feedback gain is acceptable over the entire area of control of the continuously variable transmission. Even when the conditions of use are different, the speed ratio (or the input or output rotational speeds) can be stably controlled without disturbing the response.

REFERENCES:
patent: 4594916 (1986-06-01), Ito et al.
patent: 4601680 (1986-07-01), Tokoro et al.
patent: 4628773 (1986-12-01), Itoh et al.
patent: 4642068 (1987-02-01), Osanai et al.

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