Continuously variable transmission, and controller and control m

Details Continuously variable transmission, and controller and control m Continuously variable transmission, and controller and control m

1998-11-13

2000-03-14

Herrmann, Allan D.

Friction gear transmission systems or components

Condition responsive ratio change

Fluid control

476 10, 477 37, 477 48, 477 50, F16H 6102, F16H 1538, B60K 4112

Patent

active

060366176

ABSTRACT:
A speed ratio of a continuously variable transmission is varied according to an oil pressure which is adjusted by a valve driven by a step motor. The step motor is feedback controlled so that a real speed ratio coincides with a target speed ratio determined according to the running conditions of a vehicle. By determining a feedback gain based on the oil pressure, oil temperature, real speed ratio and output shaft rotation speed of the transmission, precise control of the speed ratio according to the running state is realized.

REFERENCES:
patent: 4434675 (1984-03-01), Kraus
patent: 4945483 (1990-07-01), Tokoro
patent: 5062050 (1991-10-01), Petzold et al.
patent: 5136890 (1992-08-01), Hibi et al.
patent: 5189611 (1993-02-01), Petzold et al.
patent: 5643132 (1997-07-01), Inoue
patent: 5669845 (1997-09-01), Muramoto et al.
patent: 5674145 (1997-10-01), Kidokoro et al.

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