Control system for power shifted transmission

Details Control system for power shifted transmission Control system for power shifted transmission

F - Mech Eng,Light,Heat,Weapons

15

B

341/68, 138/78

F15B 9/17 (2006.01) F16H 61/06 (2006.01) F16H 59/08 (2006.01) F16H 61/02 (2006.01) F16H 61/04 (2006.01)

Patent

CA 1180636

CONTROL SYSTEM FOR POWER SHIFTED TRANSMISSION Abstract: A control system for a power shifted transmis- sion includes an electrical signal processing system (28), incorporating a digital processor, which provides output signals to regulate operation of the directional clutch (23) and the range clutches (24) through a plurality of spool valves. An hydraulic stabilizer (41) is connected to a common line supplying the directional clutch, to provide a predetermined amount of fluid with each change in direction, with the remainder of the fluid being provided through a forward-reverse modulating valve (36). A neutral bleed valve (42) is connected to reduce the measured amount of fluid in the stabi- lizer when the clutch is being shifted from the neutral position, instead of a full directional change. To improve range shifts, the directional clutch is slipped while the range change is made, and the directional clutch is then re-applied. A horsepower indicator provides the vehicle operator with an instantaneous indication of the vehicle operating efficiency. "Inching" or low speed operation, notwithstanding a high engine speed, is also provided.

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