Speed change gear control system for hydrostatic-mechanical tran

Details Speed change gear control system for hydrostatic-mechanical tran Speed change gear control system for hydrostatic-mechanical tran

1994-10-18

1996-06-04

Marmor, Charles A.

Planetary gear transmission systems or components

Fluid drive or control of planetary gearing

Fluid pump and motor in one of plural paths to or from...

475 80, 477 68, F16H 4704

Patent

active

055227759

ABSTRACT:
A speed change gear control system, wherein gear shift control for shifting the transmission from an arbitrary speed range into a higher speed range which provides higher absolute speed than the arbitrary speed range is performed, provided that the actual speed ratio e of the transmission satisfies .vertline.E.sub.1 .vertline.<.vertline.e.vertline.<.vertline.E.sub.0 .vertline. where E.sub.0 is a speed ratio for a shifting point at which the transmission is shifted from the arbitrary speed range into the higher speed range; and E.sub.1 is a specified speed ratio, or provided that .vertline.e.vertline.+(.DELTA.e/.DELTA.t).times.T.sub.1 >.vertline.E.sub.0 .vertline.-.DELTA.E.sub.1 where .DELTA.e is an increase in the speed ratio e over a period of time .DELTA.t; T.sub.1 is the filling time required for supplying hydraulic oil to a clutch which shifts the transmission from the arbitrary speed range to the higher speed range; and .DELTA.E.sub.1 is a specified small speed ratio.

REFERENCES:
patent: 3990327 (1976-11-01), Margolin
patent: 4043227 (1977-08-01), Beals et al.
patent: 4068543 (1978-01-01), Sakai et al.
patent: 4309917 (1982-01-01), Leet
patent: 5052986 (1991-10-01), Jarchow et al.
patent: 5406793 (1995-04-01), Maruyama et al.

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