Method for predicting reactive clutch loads and preemptively adjusting line pressure
First Claim
1. Method for adjusting hydraulic line pressure applied to a clutch device in an electro-mechanical transmission mechanically-operatively coupled to an internal combustion engine and at least one electric machine, comprising:
- predicting a first plurality of powertrain parameters for an upcoming event based on an operator torque request;
determining, for each of a plurality of available engine torques, a predicted output torque and a predicted clutch load that minimizes a total powertrain operating cost based on the predicted first plurality of powertrain parameters; and
adjusting hydraulic line pressure based on the engine torque having a lowest powertrain operating cost from among the plurality of available engine torques.
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Accused Products
Abstract
A method for adjusting hydraulic line pressure applied to one or more clutch devices in an electro-mechanical transmission mechanically-operatively coupled to an internal combustion engine and at least one electric machine includes predicting a first plurality of powertrain parameters for an upcoming event. For each of a plurality of engine torques, a predicted output torque and a predicted clutch load are determined that minimize a total powertrain operating cost based on an operator torque request and the predicted first plurality of powertrain parameters. Hydraulic line pressure is adjusted based on the engine torque having a lowest powertrain operating cost among the plurality of available engine torques.
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Citations
20 Claims
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1. Method for adjusting hydraulic line pressure applied to a clutch device in an electro-mechanical transmission mechanically-operatively coupled to an internal combustion engine and at least one electric machine, comprising:
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predicting a first plurality of powertrain parameters for an upcoming event based on an operator torque request; determining, for each of a plurality of available engine torques, a predicted output torque and a predicted clutch load that minimizes a total powertrain operating cost based on the predicted first plurality of powertrain parameters; and adjusting hydraulic line pressure based on the engine torque having a lowest powertrain operating cost from among the plurality of available engine torques. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. Method for adjusting hydraulic line pressure applied to one or more clutch devices in an electro-mechanical transmission mechanically-operatively coupled to an internal combustion engine and at least one electric machine, comprising:
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predicting a first plurality of powertrain parameters for an upcoming event based on an operator torque request, said upcoming event including any combination of a transmission shift, an output torque change, and an engine torque change; for each one of a plurality of engine states each having a respective plurality of available engine torques determining, for each of the plurality of available engine torques, a predicted clutch load for each of the one or more clutch devices and a predicted output torque that minimizes a total powertrain operating cost based on the predicted first plurality of powertrain parameters, and selecting the engine torque having the lowest powertrain operating cost from among the plurality of available engine torques; and adjusting hydraulic line pressure based on a final engine torque having the lowest powertrain operating cost from among the plurality of engine states. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. An apparatus for controlling a powertrain comprising:
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an electro-mechanical transmission mechanically-operatively coupled to an internal combustion engine and at least one electric machine adapted to selectively transmit mechanical power to an output member via selective application of one or more hydraulically-applied clutch devices; and a controller implemented within a control module including a predictive powertrain parameter module configured to predict a first plurality of powertrain parameters during an upcoming event; an optimization module configured to determine, for each of a plurality of available engine torques, a predicted output torque and a predicted clutch load that minimizes a total powertrain operating cost based on an operator torque request and the predicted first plurality of powertrain parameters; and a line pressure control module configured to adjust hydraulic line pressure applied to the clutch device based on the engine torque having a lowest powertrain operating cost among the plurality of available engine torques.
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Specification