Clutch torque trajectory correction to provide torque hole filling during a ratio upshift
First Claim
1. A powertrain comprising:
- a multiple-ratio transmission with oncoming and off-going clutches for effecting a ratio-upshift;
a torque sensor for measuring a clutch torque one of the off-going and oncoming clutches during a torque phase; and
a shift controller programmed to;
release the off-going clutch if the measured clutch torque indicative of an off-going clutch torque is less than a threshold to effectuate the ratio-upshift.
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Abstract
A control system and method for controlling a multiple gear ratio automatic transmission in a powertrain for an automatic transmission having pressure activated friction torque elements to effect gear ratio upshifts. The friction torque elements are synchronously engaged and released during a torque phase of an upshift event as torque from a torque source is increased while allowing the off-going friction elements to slip, followed by an inertia phase during which torque from a torque source is modulated. A perceptible transmission output torque reduction during an upshift is avoided. Measured torque values are used during a torque phase of the upshift to correct an estimated oncoming friction element target torque so that transient torque disturbances at an oncoming clutch are avoided and torque transients at the output shaft are reduced.
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Citations
20 Claims
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1. A powertrain comprising:
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a multiple-ratio transmission with oncoming and off-going clutches for effecting a ratio-upshift; a torque sensor for measuring a clutch torque one of the off-going and oncoming clutches during a torque phase; and a shift controller programmed to;
release the off-going clutch if the measured clutch torque indicative of an off-going clutch torque is less than a threshold to effectuate the ratio-upshift. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for controlling a multiple-ratio transmission comprising:
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measuring a torque of at least one of an oncoming and off-going clutch during a torque phase; and releasing the off-going clutch if the measured torque indicative of an off-going clutch torque is less than a threshold to effectuate a ratio-upshift. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification