Speed change ratio controller for continuously variable transmis

Details Speed change ratio controller for continuously variable transmis Speed change ratio controller for continuously variable transmis

1998-04-08

2000-04-11

Cuchlinski, Jr., William A.

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

Transmission control

701 53, 477 46, 477 48, 74886, F16H 3500

Patent

active

060497505

ABSTRACT:
A speed change ratio of a continuously variable transmission comprising a V-belt looped around a pair of variable pulleys for varying the speed change ratio according to a first and second oil pressures. A speed change control valve converts a first oil pressure from an oil pressure supply unit to a second oil pressure based on a speed change ratio command value. The speed change ratio command value is calculated by a microprocessor according to a real speed change ratio and dynamic characteristics of the transmission. By calculating the dynamic characteristics according to the real speed change ratio and the first oil pressure, a set response of the transmission is always obtained regardless of fluctuations of the first oil pressure.

REFERENCES:
patent: 5144864 (1992-09-01), Sawasaki et al.
patent: 5612873 (1997-03-01), Ogawa
patent: 5672137 (1997-09-01), Adachi et al.
patent: 5788599 (1998-08-01), Adachi et al.
patent: 5820514 (1998-10-01), Adachi
patent: 5857937 (1999-01-01), Ashizawa et al.
patent: 5908367 (1999-06-01), Tominaga et al.
patent: 5908461 (1999-06-01), Tsukamoto et al.

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