Method and apparatus to create a pseudo torque phase during oncoming clutch engagement to prevent clutch slip for a hybrid powertrain system
AssigneesGM Global Technology Operations LLC, Daimler AG, Chrysler Group LLC, Bayerische Motoren Werke Aktiengesellschaft
InventorsAnthony H. Heap, Lawrence A. Kaminsky, Jy-Jen F. Sah
Life of this patent
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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.
Claims8
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.
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:
- 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 a 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.
Dependencies are inferred from the claim text.