Clutch torque trajectory correction to provide torque hole filling during a ratio upshift
First Claim
1. A transmission comprising:
- an oncoming clutch and off-going clutch for effecting a gear-ratio upshift; and
an actuator that varies a torque capacity of the on-coming clutch during a torque phase based on a measured torque of a torque transmitting element of the transmission.
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Abstract
A multiple ratio transmission having an input shaft, an output shaft and oncoming clutch and off-going clutch for effecting ratio upshifts is provided. The transmission also includes a transmission controller configured for controlling shifts. During the torque phase of a ratio upshift, the controller increases input torque. Next, the controller estimates an oncoming clutch target torque. The controller controls a torque input to ensure the off-going clutch remains locked. The controller measures an actual transmission value for a torque transmitting element of the transmission and corrects the oncoming clutch target torque using the actual transmission value whereby an increasing torque for the oncoming friction element is achieved with minimal torque transients along the output shaft during the upshift.
48 Citations
20 Claims
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1. A transmission comprising:
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an oncoming clutch and off-going clutch for effecting a gear-ratio upshift; and an actuator that varies a torque capacity of the on-coming clutch during a torque phase based on a measured torque of a torque transmitting element of the transmission. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A transmission comprising:
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an oncoming clutch and off-going clutch for effecting a ratio upshift; and a shift controller, during a torque phase of the upshift, configured for; receiving a measured torque signal based on a measured torque of a torque transmitting element of the transmission; and controlling the oncoming clutch by varying a torque capacity of the on-coming clutch to achieve an estimated target torque in response to the measured torque signal. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A method for controlling a transmission during an upshift, the method comprising:
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measuring an actual torque for a torque transmitting element of the transmission; and controlling an oncoming clutch by varying torque capacity in response to the actual torque of the torque transmitting element to provide a generally decreasing output shaft torque during the torque phase and inertia phase of the upshift. - View Dependent Claims (17, 18, 19, 20)
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Specification