Method and apparatus for clutch torque control in mode and fixed gear for a hybrid powertrain system
First Claim
1. Method for controlling a hydraulic line pressure of a hydraulic control system in 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 via selective application of a plurality of hydraulically-applied torque transfer clutches, said method comprising:
- monitoring a current output torque of said transmission;
monitoring a requested output torque command;
monitoring transmission of clutch reactive torque in each of said clutches;
adjusting a minimum clutch torque capacity as a feed-forward control based upon said clutch reactive torques and comparing said requested output torque command to said current output torque; and
controlling said hydraulic line pressure by modulating operation of said hydraulic control system based upon said minimum clutch torque capacity;
wherein said current output torque is generated by providing mechanical power from said electric machine and selectively providing mechanical power from said engine.
20 Assignments
0 Petitions
Accused Products
Abstract
A method for controlling hydraulic line pressure of a hydraulic control system in 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 via selective application of a plurality of hydraulically-applied torque transfer clutches includes monitoring requirements for transmission of clutch reactive torque in one of the clutches, monitoring a hydraulic line pressure within the hydraulic control system, determining a minimum clutch torque capacity required to keep the clutch from slipping, determining a hydraulic line pressure required to create the minimum clutch torque capacity, and modulating hydraulic line pressure applied to the clutch by modulating operation of the hydraulic control system based upon the hydraulic line pressure required to create the minimum clutch torque capacity.
244 Citations
10 Claims
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1. Method for controlling a hydraulic line pressure of a hydraulic control system in 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 via selective application of a plurality of hydraulically-applied torque transfer clutches, said method comprising:
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monitoring a current output torque of said transmission; monitoring a requested output torque command; monitoring transmission of clutch reactive torque in each of said clutches; adjusting a minimum clutch torque capacity as a feed-forward control based upon said clutch reactive torques and comparing said requested output torque command to said current output torque; and controlling said hydraulic line pressure by modulating operation of said hydraulic control system based upon said minimum clutch torque capacity; wherein said current output torque is generated by providing mechanical power from said electric machine and selectively providing mechanical power from said engine. - View Dependent Claims (2, 3, 4, 5, 6)
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7. Method for controlling a hydraulic line pressure of a hydraulic control system in 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 via selective application of a plurality of hydraulically-applied torque transfer clutches, said method comprising:
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monitoring a current output torque of said transmission; monitoring a requested output torque command; adjusting a minimum clutch torque capacity as a feed-forward control comprising; determining a line pressure compensation factor based upon a greater of one and a ratio of said requested output torque to said current output torque; and adjusting said minimum clutch torque capacity based upon said line pressure compensation factor; and controlling said hydraulic line pressure by modulating operation of said hydraulic control system based upon said minimum clutch torque capacity; wherein said current output torque is generated by providing mechanical power from said electric machine and selectively providing mechanical power from said engine. - View Dependent Claims (8, 9, 10)
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Specification