Method of controlling interrupted shifts for a powershift transmission
First Claim
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1. A method of controlling an automatic transmission, the transmission including a plurality of speed changing clutches and a plurality of direction changing clutches, the method including the following steps:
- storing a plurality of interrupted shift rules relating to a set of speed clutches;
storing a plurality of interrupted shift rules relating to a set of direction clutches;
producing a first signal indicative of a shift from a first transmission ratio to a second transmission ratio;
thereafter, producing a second signal indicative of a shift from the second transmission gear ratio to a third transmission ratio; and
receiving the first and second signals, determining which of the plurality of the interrupted shift rules applies to the speed and direction clutches in response to the first, second, and third transmission ratios, and responsively producing clutch command signals to shift to the third transmission ratio.
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Abstract
In one aspect of the present invention, a method for controlling an interrupted shift for a powershift transmission is disclosed. The method first determines which clutches are active and then classifies each of the active clutches. Thereafter, the method calculates the timing associated with the engagement and disengagement of the classified active clutches to result in a smooth transition to the final selected gear.
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4 Claims
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1. A method of controlling an automatic transmission, the transmission including a plurality of speed changing clutches and a plurality of direction changing clutches, the method including the following steps:
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storing a plurality of interrupted shift rules relating to a set of speed clutches; storing a plurality of interrupted shift rules relating to a set of direction clutches; producing a first signal indicative of a shift from a first transmission ratio to a second transmission ratio; thereafter, producing a second signal indicative of a shift from the second transmission gear ratio to a third transmission ratio; and receiving the first and second signals, determining which of the plurality of the interrupted shift rules applies to the speed and direction clutches in response to the first, second, and third transmission ratios, and responsively producing clutch command signals to shift to the third transmission ratio. - View Dependent Claims (2, 3, 4)
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Specification