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US 4,989,470 AGranted
Method of decelerating a power shift transmission
AssigneeFord New Holland, Inc.
InventorGarth H. Bulgrien
Life of this patent
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AssigneeFord New Holland, Inc.
InventorGarth H. Bulgrien
Estimating the term…
A microprocessor controlling a shuttle shift transmission may be programmed while the gearshift lever is in neutral to preselect a forward and reverse gear into which the transmission is shifted when the gearshift lever is moved to a forward or reverse position. The microprocessor may also be programmed so that, in shifting between forward and reverse, the forward and reverse gears selected differ by a pre-programmed amount. The microprocessor may be programmed to control vehicle deceleration by selecting gears in the transmission so that the transmission and/or the vehicle engine become a load for decelerating the vehicle. In the method of decelerating the tractor from relatively high vehicle speeds, the transmission is disconnected from the engine and then locked by simultaneously engaging two clutches for the simultaneous engagement of two gear ratios. A modulation of the final clutch set permits the inertial energy of the tractor to be dissipated.
A method of controlling vehicle deceleration during shuttle shifting of a transmission having an initial clutch set for selectively connecting an engine driven input drive shaft in driving relationship with a first plurality of shafts, a final clutch set for selectively connecting a second plurality of shafts in driving relationship with an output shaft for driving the vehicle, and an intermediate clutch set for selectively connecting the first plurality of shafts in driving relationship with said second plurality of shafts, first gears on said first plurality of shafts for driving all of said first plurality of shafts at the same speed when any clutch of said initial clutch set is energized, and second gears on said first plurality of shafts for driving said second plurality of shafts at different speeds relative to the speeds of said first plurality of shafts when any one clutch of said set of intermediate clutches is energized, said method comprising:
A method of controlling vehicle deceleration during shuttle shifting of a power shift transmission having clutches for selectively interconnecting an input drive shaft, an output drive shaft, and a plurality of gears rotatably housed in said transmission in driving relationship with said input and output drive shafts such that a selective engagement of said clutches will effect a varying of the speed of operation of said output shaft for a given speed of operation of said input shaft, said gears being arranged in preselected gear ratios from a low speed to a high speed, the method comprising:
A method of controlling vehicle deceleration during shuttle shifting of a transmission having an initial clutch set for selectively connecting an engine driven input drive shaft in driving relationship with a first plurality of shafts, a final clutch set for selectively connecting a second plurality of shafts in driving relationship with an output shaft for driving the vehicle, and an intermediate clutch set for selectively connecting the first plurality of shafts in driving relationship with said second plurality of shafts, first gears on said first plurality of shafts for driving all of said first plurality of shafts at the same speed when any clutch of said initial clutch set is energized, and second gears on said first plurality of shafts for driving said second plurality of shafts at different speeds relative to the speeds of said first plurality of shafts when any one clutch of said set of intermediate clutches is energized, said method comprising:
Dependencies are inferred from the claim text.