Method and apparatus for maximum and minimum output torque performance by selection of hybrid range state and input speed for a hybrid powertrain system
First Claim
1. Method for controlling a powertrain system including an engine mechanically coupled to an electro-mechanical transmission selectively operative in one of a plurality of transmission operating range states and one of a plurality of engine states, comprising:
- determining a current transmission operating range state for the electromechanical transmission and engine state for the engine;
determining at least one potential transmission operating range state and engine state;
providing an operator torque request;
determining preferability factors associated with the current transmission operating range state and engine state, and potential transmission operating range states and engine states;
preferentially weighting the preferability factors for the current transmission operating range state and engine state; and
selectively commanding changing the current transmission operating range state of the electromechanical transmission and engine state of the engine based upon said preferability factors and said operator torque request.
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0 Petitions
Accused Products
Abstract
A powertrain system includes an engine mechanically coupled to an electro-mechanical transmission selectively operative in one of a plurality of transmission operating range states and one of a plurality of engine states. A method for controlling the powertrain system includes determining a current transmission operating range state and engine state, determining at least one potential transmission operating range state and engine state, providing an operator torque request, determining preferability factors associated with the current transmission operating range state and engine state, and potential transmission operating range states and engine states, preferentially weighting the preferability factors for the current transmission operating range state and engine state, and selectively commanding changing the current transmission operating range state and engine state based upon the preferability factors and the operator torque request.
234 Citations
20 Claims
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1. Method for controlling a powertrain system including an engine mechanically coupled to an electro-mechanical transmission selectively operative in one of a plurality of transmission operating range states and one of a plurality of engine states, comprising:
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determining a current transmission operating range state for the electromechanical transmission and engine state for the engine; determining at least one potential transmission operating range state and engine state; providing an operator torque request; determining preferability factors associated with the current transmission operating range state and engine state, and potential transmission operating range states and engine states; preferentially weighting the preferability factors for the current transmission operating range state and engine state; and selectively commanding changing the current transmission operating range state of the electromechanical transmission and engine state of the engine based upon said preferability factors and said operator torque request. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. Method for biasing selection criteria used in selecting an engine operating point from a plurality of engine operating points in each of a plurality of potential transmission operating range states in a motorized vehicle including an engine mechanically coupled to an electro-mechanical transmission, comprising:
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providing a minimum torque output value and maximum torque output value for said transmission for a plurality of engine operating points in each potential transmission operating range state, which minimum and maximum values define a potential torque output range for each engine operating point in each potential transmission operating range state; providing a biasing cost function for a plurality of engine operating points in each potential transmission operating range state over the potential torque output range associated therewith; providing an operator torque request having a torque magnitude; assigning a biasing cost to engine operating points in each potential transmission operating range state based on the magnitude of said operator torque request; and commanding changes of said transmission operating range state based on a comparison of biasing costs assigned to potential transmission operating range states for which the magnitude of torque represented by said operator torque request is outside of their potential torque output ranges. - View Dependent Claims (14, 15, 16, 18)
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17. A system for controlling a powertrain system including an engine mechanically coupled to an electro-mechanical transmission selectively operative in one of a plurality of transmission operating range states and one of a plurality of engine states, comprising:
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a microprocessor configured to receive data and provide an output, said data including a first set of preferability factors, a second set of preferability factors relating to desired operating range states of said transmission, a third set of preferability factors relating to current operating range states of said transmission, and a fourth set of preferability factors, said fourth set of preferability factors comprising input speed trip preferability factors; a control module configured to control shifting events in said transmission, said control module having inputs and outputs, wherein output from said microprocessor is provided as input to said control module, said control module being configured to provide said third set of preferability factors to said microprocessor as an input thereto; and an electro-mechanical transmission in effective electrical communication with output from said control module; said system configured sufficiently that commanded changes of transmission operating range state are executed using biasing costs assigned to potential operating range states of said transmission based on at least one operator torque request, said biasing costs comprising power loss costs being determined using a biasing cost function which provides a torque reserve.
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19. A method for selecting a transmission operating range state from potential transmission operating range states in a motorized vehicle including an engine mechanically coupled to an electro-mechanical transmission, which comprises:
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providing an operator torque request having a magnitude; providing an on-board microprocessor configured to execute a search engine for selecting a first engine operating point from a search range space containing possible engine operating points associated with a potential transmission operating range state; calculating maximum and minimum output torques from the drivetrain system associated with said first engine operating assigning a biasing cost to the difference between the magnitude of the operator torque request and the torque deliverable by said transmission if operating said vehicle transmission at the parameters defined by said first engine operating point; summing of power losses associated with operating said vehicle transmission at the parameters defined by said first engine operating point to provide a total power loss; repetition of said selecting, calculating, assigning, and summing for a plurality of engine operating points in said search range space, so as to provide a total power loss for engine operating points in said plurality; selecting at least one point from search range space which have the lowest power loss; repeating said selecting, calculating, assigning, summating, repetition, and selecting for at least two potential transmission operating range states; and selectively commanding changing the transmission operating range state based upon a comparison of power losses associated with engine operating points. - View Dependent Claims (20)
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Specification