Shift control device and shift control method of vehicular...

Details Shift control device and shift control method of vehicular... Shift control device and shift control method of vehicular...

2007-07-12

2009-08-04

Lewis, Tisha D (Department: 3655)

Interrelated power delivery controls, including engine control

Transmission control

Continuously variable friction transmission

C477S050000

Reexamination Certificate

active

07568995

ABSTRACT:
A hydraulic control circuit that shuts off an oil passageway so that the ratio between the shift pressure and the belt clamping pressure is not caused to be in a predetermined relationship even when a speed change ratio control valve and/or a speed change ratio control valve are not supplying/discharging hydraulic oil. Therefore, even if the speed change ratio control valve and/or the speed change ratio control valve cease supplying/discharging the hydraulic oil, the action of a thrust ratio control oil pressure Pτ output from a thrust ratio control valve on a primary hydraulic cylinder is avoided. Thus, impairment of the continuity of control at the time of a shift of the continuously variable transmission is prevented.

REFERENCES:
patent: 4584909 (1986-04-01), Abo et al.
patent: 4923433 (1990-05-01), Tanaka et al.
patent: 5052980 (1991-10-01), Itoh et al.
patent: 6146308 (2000-11-01), Taniguchi et al.
patent: A-9-210158 (1997-08-01), None
patent: A-11-82701 (1999-03-01), None
patent: A-2001-330112 (2001-11-01), None
patent: A 2005-42799 (2005-02-01), None

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