Method and apparatus for monitoring an electrical energy storage device
First Claim
1. Method for monitoring an electrical energy storage device adapted to transfer electric energy to drive an electric motor, comprising:
- determining a state of charge and a temperature of the electrical energy storage device subsequent to a stabilization period;
selectively actuating the electric motor;
measuring a minimum voltage output from the electrical energy storage device during the selective actuation of the electric motor;
determining a threshold voltage state based upon the state of charge and the temperature of the electrical energy storage device; and
,determining a remaining useful life of the electrical energy storage device based upon the minimum voltage and the threshold voltage state.
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Accused Products
Abstract
A method and article of manufacture for monitoring an electrical energy storage device adapted to supply electrical power to a selectively actuable electric motor is described. This comprises determining a state of charge and a temperature of the electrical energy storage device subsequent to a stabilization period, and measuring a minimum voltage output from the electrical energy storage device during selective actuation of the electric motor. One of a plurality of predetermined threshold voltage states is selected based upon the state of charge and the temperature. The minimum voltage is compared to the selected predetermined threshold voltage.
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Citations
20 Claims
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1. Method for monitoring an electrical energy storage device adapted to transfer electric energy to drive an electric motor, comprising:
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determining a state of charge and a temperature of the electrical energy storage device subsequent to a stabilization period; selectively actuating the electric motor; measuring a minimum voltage output from the electrical energy storage device during the selective actuation of the electric motor; determining a threshold voltage state based upon the state of charge and the temperature of the electrical energy storage device; and
,determining a remaining useful life of the electrical energy storage device based upon the minimum voltage and the threshold voltage state. - View Dependent Claims (2, 3, 4, 5)
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6. Method for monitoring a battery adapted to supply electrical power to an electric motor adapted to crank an internal combustion engine, comprising:
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determining a state of charge and a temperature of the battery subsequent to a stabilization period; measuring a minimum voltage output from the battery during engine cranking; selecting one of a plurality of predetermined threshold voltage states based upon the state of charge and the temperature of the battery; comparing the minimum voltage output measured from the battery during engine cranking to the selected predetermined threshold voltage state; and
,calculating a remaining useful life of the battery based upon the minimum voltage and the threshold voltage determined based upon the state of charge and the temperature of the battery. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14)
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15. Article of manufacture, comprising a storage medium having machine-executable code encoded therein to monitor a state of health of a battery adapted to supply electrical power to an electric motor adapted to crank an internal combustion engine, the code comprising:
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code to determine a state of charge and a temperature of the battery subsequent to a stabilization period; code to measure a minimum voltage output from the battery during engine cranking; code to compare the minimum voltage output from the battery during engine cranking to a threshold voltage determined based upon the state of charge and the temperature of the battery; and
,code to calculate a remaining useful life of the battery based upon the minimum voltage and the threshold voltage determined based upon the state of charge and the temperature of the battery. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification