Method for estimating battery life in a hybrid powertrain
First Claim
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1. A method for estimating a remaining operating life of an electrical energy storage device electrically operatively connected to an electric machine of a hybrid powertrain system, comprising:
- monitoring temperature, state-of-charge, and electric current during both charging and discharge events of the electrical energy storage device during a predetermined time interval;
determining an electric current discharge comprising integrating the electric current during the discharge events of the electrical energy storage device during the predetermined time interval;
determining a temperature factor and a state-of-charge factor based upon the monitored temperature and the monitored state-of-charge during the predetermined time interval;
calculating a battery life metric during the predetermined time interval based upon the temperature factor, the state-of-charge factor, and the electric current discharge, wherein the battery life metric accounts for the electric current discharge during the predetermined time interval and does not account for the electric current during the charging of the electrical energy storage device during the predetermined time interval;
determining a total battery life metric based on the calculated battery life metric; and
determining the remaining operating life of the electrical energy storage device based upon the total battery life metric.
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Abstract
A method for estimating an operating life for an electrical energy storage system electrically connected to transmit power to a hybrid powertrain system includes monitoring temperature state-of-charge and electric current of the electrical energy storage system, calculating a battery life metric for a time interval based upon the temperature, the state-of-charge, and the electric current discharge, determining a total battery life metric therefrom and determining the remaining operating life of the electrical energy storage system.
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Citations
13 Claims
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1. A method for estimating a remaining operating life of an electrical energy storage device electrically operatively connected to an electric machine of a hybrid powertrain system, comprising:
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monitoring temperature, state-of-charge, and electric current during both charging and discharge events of the electrical energy storage device during a predetermined time interval; determining an electric current discharge comprising integrating the electric current during the discharge events of the electrical energy storage device during the predetermined time interval; determining a temperature factor and a state-of-charge factor based upon the monitored temperature and the monitored state-of-charge during the predetermined time interval; calculating a battery life metric during the predetermined time interval based upon the temperature factor, the state-of-charge factor, and the electric current discharge, wherein the battery life metric accounts for the electric current discharge during the predetermined time interval and does not account for the electric current during the charging of the electrical energy storage device during the predetermined time interval; determining a total battery life metric based on the calculated battery life metric; and determining the remaining operating life of the electrical energy storage device based upon the total battery life metric. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for estimating a remaining operating life of an electrical energy storage device electrically connected to transmit power to an electro-mechanical transmission, comprising:
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monitoring temperature of the electrical energy storage device; monitoring a state-of-charge during both charging and discharge events of the electrical energy storage device during a predetermined time interval; monitoring electric current of the electrical energy storage device during the predetermined time interval; determining an electric current discharge comprising integrating the electric current during the discharge events of the electrical energy storage device during the predetermined time interval; determining a temperature factor and a state-of-charge factor based upon the monitored temperature and the monitored state-of-charge during the predetermined time interval; calculating a battery life metric during the predetermined time interval based upon the temperature factor, the state-of-charge factor, and the electric current discharge, wherein the battery life metric accounts for the electric current discharge during the predetermined time interval and does not account for the electric current during the charging of the electrical energy storage device during the predetermined time interval; determining a total battery life metric based on the calculated battery life metric; and determining the remaining operating life of the electrical energy storage device based upon a predicted electrical energy storage device lifespan and the total battery life metric, wherein the remaining electrical energy storage device life is the difference between the predicted battery lifespan and the total battery life metric. - View Dependent Claims (12, 13)
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Specification