Creation and depletion of short term power capability in a hybrid electric vehicle
First Claim
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1. A method for controlling operation of a hybrid powertrain system based upon electric power limits for an electric energy storage device, comprising:
- providing long term power limits of the electric energy storage device;
determining short term power limits of the electric energy storage device based upon the long term power limits;
monitoring electric energy storage device power flow;
controlling power output of the hybrid powertrain system based upon the short term power limits of the electric energy storage device during an electrical energy storage device power excursion outside of the long term power limits; and
converging the short term power limits to the long term power limits when at least one ofan energy area metric reaches a predetermined energy area metric threshold, the energy area metric comprising a measure of the electrical energy storage device power flow exceeding the long term power limits over an elapsed period of time, anda monitored elapsed time reaches a predetermined time threshold wherein the electrical energy storage device power flow exceeds the long term power limits.
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Abstract
Short term power limits of an electrical energy storage device are progressively tightened toward long term power limits in accordance with net energy flow or magnitude or duration metrics.
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Citations
17 Claims
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1. A method for controlling operation of a hybrid powertrain system based upon electric power limits for an electric energy storage device, comprising:
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providing long term power limits of the electric energy storage device; determining short term power limits of the electric energy storage device based upon the long term power limits; monitoring electric energy storage device power flow; controlling power output of the hybrid powertrain system based upon the short term power limits of the electric energy storage device during an electrical energy storage device power excursion outside of the long term power limits; and converging the short term power limits to the long term power limits when at least one of an energy area metric reaches a predetermined energy area metric threshold, the energy area metric comprising a measure of the electrical energy storage device power flow exceeding the long term power limits over an elapsed period of time, and a monitored elapsed time reaches a predetermined time threshold wherein the electrical energy storage device power flow exceeds the long term power limits. - View Dependent Claims (5, 8, 9, 10, 11, 12)
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2. A method for controlling operation of a hybrid powertrain system based upon electric power limits for an electric energy storage device, comprising:
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providing long term power limits of the electric energy storage device; determining short term power limits of the electric energy storage device based upon the long term power limits; controlling power output of the hybrid powertrain system based upon the short term power limits of the electric energy storage device during an electrical energy storage device power excursion outside of the long term power limits; determining an energy area metric based upon the long term power limits, an elapsed time, and an electrical energy storage device power flow; and converging the short term power limits to the long term power limits when the monitored energy area metric reaches a first predetermined threshold. - View Dependent Claims (3, 4)
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6. A method for controlling operation of a hybrid powertrain system based upon electric power limits for an electric energy storage device, comprising:
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providing long term power limits of the electric energy storage device; determining short term power limits of the electric energy storage device based upon the long term power limits; controlling power output of the hybrid powertrain system based upon the short term power limits of the electric energy storage device during an electrical energy storage device power excursion outside of the long term power limits; determining electric energy storage device power flow; monitoring an elapsed time wherein electric energy storage device power flow exceeds the long term power limits; incrementing the monitored elapsed time when the actual power output exceeds the long term power limits; decrementing the monitored elapsed time when the actual power output is less than the long term power limits; and converging the short term power limits to the long term power limits when the monitored elapsed time reaches a first predetermined threshold. - View Dependent Claims (7)
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13. A method for operating a hybrid powertrain system including an electro-mechanical transmission connected to an energy storage device, comprising;
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monitoring electric power flow between the electric energy storage device and the electro-mechanical transmission; determining a net energy change in the electric energy storage device based upon the electric power flow between the electric energy storage device and the electro-mechanical transmission and predetermined long term power limits; determining short term power limits of the electric energy storage device based upon the long term power limits and the net energy change; and controlling power output of the hybrid powertrain system based upon the short term power limits of the electric energy storage device. - View Dependent Claims (14)
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15. A method for operating of a hybrid powertrain system including an electro-mechanical transmission connected to an energy storage device, comprising;
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monitoring electric power flow between the electric energy storage device and the electro-mechanical transmission; determining a net elapsed time based upon the electric power flow between the electric energy storage device and the electro-mechanical transmission and predetermined long term power limits; determining short term power limits of the electric energy storage device based upon the long term power limits and the net elapsed time; and controlling power output of the hybrid powertrain system based upon the short term power limits of the electric energy storage device. - View Dependent Claims (16, 17)
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Specification