METHOD AND APPARATUS TO CREATE A PSEUDO TORQUE PHASE DURING ONCOMING CLUTCH ENGAGEMENT TO PREVENT CLUTCH SLIP FOR A HYBRID POWERTRAIN SYSTEM
First Claim
1. Method for controlling a powertrain comprising an electro-mechanical transmission mechanically-operatively coupled to an internal combustion engine and an electric machine adapted to selectively transmit mechanical power to an output member through selective application of a plurality of torque-transfer clutches, the method comprising:
- monitoring a clutch slip speed;
synchronizing an oncoming clutch; and
constraining reactive clutch torque limits for said oncoming clutch to achieve a reactive clutch torque that is less than an estimated clutch torque capacity.
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Accused Products
Abstract
A method for controlling a powertrain comprising an electro-mechanical transmission mechanically-operatively coupled to an engine and an electric machine adapted to selectively transmit mechanical power to an output member through selective application of a plurality of torque-transfer clutches includes monitoring a clutch slip speed, synchronizing an oncoming clutch, and constraining reactive clutch torque limits for the oncoming clutch to achieve a reactive clutch torque that is less than an estimated clutch torque capacity.
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Citations
8 Claims
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1. Method for controlling a powertrain comprising an electro-mechanical transmission mechanically-operatively coupled to an internal combustion engine and an electric machine adapted to selectively transmit mechanical power to an output member through selective application of a plurality of torque-transfer clutches, the method comprising:
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monitoring a clutch slip speed; synchronizing an oncoming clutch; and constraining reactive clutch torque limits for said oncoming clutch to achieve a reactive clutch torque that is less than an estimated clutch torque capacity. - View Dependent Claims (2, 3, 4)
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5. Method for controlling through a transitional locking event a powertrain comprising an electro-mechanical transmission comprising a selectively activated torque-transfer clutch mechanically-operatively coupled to an internal combustion engine and an electric machine adapted to selectively transmit mechanical power to an output member, the method comprising:
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monitoring a clutch slip speed through a clutch synchronizing event; diagnosing a locked clutch state based upon said monitoring; upon said diagnosing said locked clutch state, increasing a clutch torque capacity; upon running a calibrated lead immediate delay after said diagnosing said locked clutch state, increasing a clutch reactive torque lead immediate maximum command at a controlled ramp rate; and upon running a calibrated immediate delay after said diagnosing said locked clutch state, increasing an clutch reactive torque immediate maximum command at said controlled ramp rate; wherein said increasing said clutch reactive torque lead immediate maximum command and said increasing said clutch reactive torque immediate maximum command effect a reactive torque lower than said increasing clutch torque capacity throughout said transitional locking event. - View Dependent Claims (6, 7, 8)
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Specification