System for controlling a continuously variable

Details System for controlling a continuously variable System for controlling a continuously variable

1991-10-15

1993-11-02

Bui, Thuy M.

Endless belt power transmission systems or components

Control for variable input to output speed-ratio

474 28, F16H 5900

Patent

active

052579603

ABSTRACT:
A continuously variable belt-drive transmission has a primary pulley operatively connected to an engine and a secondary pulley operatively connected to wheels of a motor vehicle, a primary cylinder and a secondary cylinder, and a hydraulic circuit having an oil pump. Primary pressure for the primary cylinder is generated by reducing secondary pressure. Steady flow rate in the primary system in a steady state is calculated, and transient flow rate in the primary system in a transient state is calculated. A primary pressure changing rate is determined to the value that the sum of secondary flow rate, the steady flow rate, and the transient flow rate becomes smaller than a discharge flow rate of the pump. In response to the primary pressure changing rate, a primary pressure control valve is operated so as to maintain balance of flow rate between the primary system and the secondary system.

REFERENCES:
patent: 4767382 (1988-08-01), Tezuka et al.
patent: 4923433 (1990-05-01), Tanaka et al.

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