Machine element or mechanism – Gearing – Interchangeably locked
Patent
1994-03-14
1995-09-19
Marmor, Charles A.
Machine element or mechanism
Gearing
Interchangeably locked
192 358, 192103C, F16H 6100
Patent
active
054507685
ABSTRACT:
In a tractor transmission system having electro-hydraulically actuated powershift clutches and a forward/reverse coupler mechanically coupled to a forward/reverse lever, a dump button is provided on the lever for releasing powershift clutch pressure. The forward/reverse coupler is uncoupled from the transmission input and output shafts when the button is depressed. An operator may shift between forward and reverse gears by depressing the button and shifting the lever. Upon release of the dump button, a microprocessor performs a control algorithm during which it senses engine speed and ground speed, computes acceleration/deceleration, and controls the clutch pressure of one of the powershift clutches to provide smooth acceleration in the direction selected by the shift lever. The arrangement is particularly suited for shuttle shift (forward/reverse) operations but may be used to provide smooth acceleration from a stopped position. Smooth acceleration is obtained regardless of the tractor weight and load and operation of a clutch pedal is not required. The control algorithm is equally suitable for controlling full powershift transmissions or synchronized shuttle transmissions having no powershift clutches.
REFERENCES:
patent: 5035308 (1991-07-01), Baba et al.
patent: 5062050 (1991-10-01), Petzold et al.
patent: 5097726 (1992-03-01), Asada
patent: 5101688 (1992-04-01), Pearce et al.
patent: 5333709 (1994-08-01), Bulgrien
Bulgrien Garth H.
Nielsen Bradley A.
Kwon Peter
Marmor Charles A.
New Holland North America Inc.
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