Method of decelerating a power shift transmission
First Claim
1. 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:
- releasing all clutches in said initial set of clutches to disconnect the transmission from the engine;
energizing at least two clutches in said intermediate set of clutches to lock the transmission;
energizing at least one of the clutches in the final set of clutches;
sensing the vehicle speed, and,when the vehicle speed approaches zero, selectively energizing one clutch in each of said clutch sets to select the speed at which the output shaft will be driven.
3 Assignments
0 Petitions
Accused Products
Abstract
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.
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Citations
14 Claims
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1. 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:
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releasing all clutches in said initial set of clutches to disconnect the transmission from the engine; energizing at least two clutches in said intermediate set of clutches to lock the transmission; energizing at least one of the clutches in the final set of clutches; sensing the vehicle speed, and, when the vehicle speed approaches zero, selectively energizing one clutch in each of said clutch sets to select the speed at which the output shaft will be driven. - View Dependent Claims (2, 11, 12, 14)
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3. 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:
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disconnecting said transmission from said input shaft; locking said transmission to prevent rotation of said gears; and modulating at least one of said clutches to decelerate the speed of movement of said vehicle to a desired speed of operation by dissipating the inertial energy of said vehicle through said at least one clutch. - View Dependent Claims (4, 5, 6, 7, 8, 9)
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10. 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:
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releasing all clutches in said initial clutch set to prevent the transfer of rotational power from said input drive shaft to said first plurality of shafts; energizing at least two clutches in said intermediate clutch set to lock said transmission so that said first and second plurality of shafts cannot transfer rotational power and said first and second gears cannot rotate; and modulating at least one clutch in said final clutch set to decelerate the rotational speed of said output shaft and, therefore, the speed of movement of said vehicle. - View Dependent Claims (13)
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Specification