Dual clutch driveline twist control
First Claim
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1. A method for controlling a driveline having a transmission clutch, comprising:
- (a) producing a signal representing desired engine torque to limit driveline twist rate while the clutch is locked and before a lash crossing;
(b) producing a second signal representing desired clutch capacity to maintain the clutch locked during the lash crossing;
(c) after the lash crossing, using the signal to increase clutch capacity at a slower rate than the driveline twist rate;
(d) using the signals to produce clutch slip by controlling engine torque and the clutch capacity such that engine torque exceeds the clutch capacity.
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Abstract
A method for controlling a driveline having a transmission clutch includes locking the clutch before a driveline lash crossing occurs; maintaining a locked clutch during the lash crossing; after the lash crossing occurs, increasing a clutch capacity at a slower rate than a driveline twist torque rate; and after the lash crossing occurs, producing clutch slip by controlling engine torque and clutch capacity such that engine torque exceeds clutch capacity.
27 Citations
34 Claims
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1. A method for controlling a driveline having a transmission clutch, comprising:
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(a) producing a signal representing desired engine torque to limit driveline twist rate while the clutch is locked and before a lash crossing; (b) producing a second signal representing desired clutch capacity to maintain the clutch locked during the lash crossing; (c) after the lash crossing, using the signal to increase clutch capacity at a slower rate than the driveline twist rate; (d) using the signals to produce clutch slip by controlling engine torque and the clutch capacity such that engine torque exceeds the clutch capacity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for controlling a driveline having a transmission clutch, comprising:
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(a) locking the clutch before a lash crossing; (b) maintaining the clutch locked during the lash crossing; (c) increasing a clutch capacity at a rate coordinated with an estimated driveline twist rate; (d) after the lash crossing occurs, producing clutch slip by controlling engine torque and clutch capacity such that engine torque exceeds clutch capacity; (e) reducing the rate of increase in clutch capacity. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A method for controlling a driveline having a transmission clutch, comprising:
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(a) using engine torque to limit driveline twist rate while the clutch is locked and before a lash crossing; (b) maintaining the clutch locked during the lash crossing; (c) after the lash crossing, increasing a clutch capacity at a slower rate than the driveline twist rate; (d) producing clutch slip by controlling engine torque and the clutch capacity such that engine torque exceeds the clutch capacity. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31)
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32. A method for controlling a vehicle driveline having a power source and a transmission clutch, comprising:
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(a) producing, in response to a demanded wheel torque, a first signal that controls torque transmitted from the power source to the clutch during a lash crossing; and (b) producing a second signal that controls clutch torque capacity such that clutch slip is produced during the lash crossing. - View Dependent Claims (33, 34)
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Specification