METHOD AND APPARATUS FOR DETERMINING THE EFFECT OF TEMPERATURE UPON LIFE EXPECTANCY OF AN ELECTRIC ENERGY STORAGE DEVICE IN A HYBRID ELECTRIC VEHICLE
First Claim
1. Method to determine an effect of temperature during a period of vehicle inactivity on life expectancy of an electrical energy storage device operative to exchange electrical energy with a hybrid vehicular powertrain including first and second electric machines each machine operable to impart torque to a two-mode, compound-split electro-mechanical transmission having four fixed gear ratios and two continuously variable operating modes, comprising, comprising:
- determining a weighted average temperature of the electrical energy storage device during the period of inactivity based upon an average temperature of the electrical energy storage device during the period of inactivity and a temperature of the electrical energy storage device substantially contemporaneous with a vehicle shut-down;
determining a resting temperature factor for the electrical energy storage device based upon the weighted average temperature of the electrical energy storage device during the period of inactivity; and
determining a life expectancy for the electrical energy storage device based on the resting temperature factor.
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Accused Products
Abstract
A hybrid vehicular powertrain includes an electrical energy storage device. A method is disclosed effective to account for the effects that temperature during periods of vehicle inactivity has upon the electrical energy storage device.
163 Citations
13 Claims
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1. Method to determine an effect of temperature during a period of vehicle inactivity on life expectancy of an electrical energy storage device operative to exchange electrical energy with a hybrid vehicular powertrain including first and second electric machines each machine operable to impart torque to a two-mode, compound-split electro-mechanical transmission having four fixed gear ratios and two continuously variable operating modes, comprising, comprising:
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determining a weighted average temperature of the electrical energy storage device during the period of inactivity based upon an average temperature of the electrical energy storage device during the period of inactivity and a temperature of the electrical energy storage device substantially contemporaneous with a vehicle shut-down; determining a resting temperature factor for the electrical energy storage device based upon the weighted average temperature of the electrical energy storage device during the period of inactivity; and determining a life expectancy for the electrical energy storage device based on the resting temperature factor. - View Dependent Claims (2, 3, 4, 5, 6)
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7. Method to determine an effect of temperature during a period of vehicle inactivity on life expectancy of an electrical energy storage device operative to exchange electrical energy with a hybrid vehicular powertrain including first and second electric machines each machine operable to impart torque to a two-mode, compound-split electro-mechanical transmission having four fixed gear ratios and two continuously variable operating modes, comprising, comprising:
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determining a weighted average temperature of the electrical energy storage device during the period of vehicle inactivity based upon an average temperature of the electrical energy storage device during the period of vehicle inactivity and a temperature of the electrical energy storage device substantially contemporaneous with the start of the period of vehicle inactivity; and
,determining a change in a state of life parameter based upon the weighted average temperature of the electrical energy storage device.
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8. Apparatus for determining an effect of temperature during a period of vehicle inactivity on life expectancy of an electrical energy storage device operative to exchange electrical energy with a hybrid vehicular powertrain including first and second electric machines each machine operable to impart torque to a two-mode, compound-split electro-mechanical transmission having four fixed gear ratios and two continuously variable operating modes, comprising:
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a temperature sensor adapted for sensing temperature of the energy storage device; a computer based controller adapted to receive a signal indicative of sensed energy storage device temperature; said computer based controller including a storage medium having a computer program encoded therein, said computer program comprising; code for determining a weighted average temperature of the electrical energy storage device during the period of inactivity based upon an average temperature of the electrical energy storage device during the period of inactivity and a temperature of the electrical energy storage device substantially contemporaneous with the start of the period of inactivity; code for determining a resting temperature factor for the electrical energy storage device based upon the weighted average temperature of the electrical energy storage device during the period of inactivity; and code for determining a life expectancy for the electrical energy storage device based on the resting temperature factor - View Dependent Claims (9, 10, 11, 12, 13)
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Specification