Ratio shift control system and method for a multiple-ratio automatic transmission
First Claim
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1. A multiple-ratio transmission wherein a powertrain source provides an input torque to the transmission comprising:
- oncoming and off-going friction elements for effecting ratio shifts; and
a controller, during a ratio upshift event, configured to;
increase the input torque from the powertrain source based on a feedback variable of the off-going friction element during a torque phase as the off-going friction element slips,thereby minimizing torque transients to a transmission output during the upshift event.
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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 powertrain source is increased while allowing the off-going friction elements to slip, followed by an inertia phase during which torque from a powertrain source is modulated. A perceptible transmission output torque reduction during an upshift is avoided.
42 Citations
25 Claims
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1. A multiple-ratio transmission wherein a powertrain source provides an input torque to the transmission comprising:
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oncoming and off-going friction elements for effecting ratio shifts; and a controller, during a ratio upshift event, configured to; increase the input torque from the powertrain source based on a feedback variable of the off-going friction element during a torque phase as the off-going friction element slips, thereby minimizing torque transients to a transmission output during the upshift event. - View Dependent Claims (2, 3)
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4. A control system for a multiple-ratio vehicle transmission comprising:
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a controller for controlling torque capacity of oncoming and off-going friction elements, wherein, during an upshift event, torque control of a powertrain source and the off-going friction element is decoupled from the oncoming friction element, wherein torque control of the powertrain source being independently managed to obtain a controlled increase in torque of the powertrain source during an torque phase and prior to an inertia phase, wherein the controller is adapted to determine a desired level of driving torque and torque of the powertrain source and to self-calibrate a required level of oncoming friction element torque capacity. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for controlling an upshift of a multiple-ratio vehicle transmission comprising:
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increasing an input torque from a powertrain source based on a feedback variable of one of an on-coming friction element and an off-going friction element during a torque phase; decreasing the input torque during a transition from the torque phase to an inertia phase until the upshift is substantially ended; decreasing the off-going friction element torque capacity during the torque phase while allowing slip; and increasing an oncoming friction element torque capacity during the torque phase. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25)
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Specification