BATTERY MAGNETIC STATE OF CHARGE SENSOR CONTROL ALGORITHM
First Claim
1. A method for converting a current output signal from a magnetic sensor that measures a magnetic field in a battery cell to a battery cell state-of-charge (SOC), said method comprising:
- providing an offset correction to the current output signal that calibrates the current output signal to a known magnetic field strength;
providing a temperature correction to the current output signal that corrects the current output signal based on a temperature of the magnetic sensor;
providing a current correction to the current output signal that removes portions of the magnetic field caused by other battery cells; and
converting the corrected current output signal to the battery cell SOC of the battery cell.
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Accused Products
Abstract
A system and method for estimating the state-of-charge (SOC) of a battery cell in a vehicle using a magnetic sensor that measures changes in magnetism of the battery cell. The method provides an offset correction to a current output signal from the magnetic sensor that calibrates the current output signal to a known magnetic field strength, provides a temperature correction to the current output signal that corrects the current output signal based on a temperature of the magnetic sensor, and provides a current correction to the current output signal that removes portions of the magnetic field caused by other battery cells, where the corrected current output signal is converted to the battery cell SOC.
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Citations
20 Claims
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1. A method for converting a current output signal from a magnetic sensor that measures a magnetic field in a battery cell to a battery cell state-of-charge (SOC), said method comprising:
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providing an offset correction to the current output signal that calibrates the current output signal to a known magnetic field strength; providing a temperature correction to the current output signal that corrects the current output signal based on a temperature of the magnetic sensor; providing a current correction to the current output signal that removes portions of the magnetic field caused by other battery cells; and converting the corrected current output signal to the battery cell SOC of the battery cell. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for converting a current output signal from a magnetic sensor that measures a magnetic field in a battery cell to a battery cell state-of-charge (SOC), said battery cell being one of a plurality of battery cells in a battery module on a vehicle, said method comprising:
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providing an offset correction to the current output signal that calibrates the current output signal to a known magnetic field strength; providing a temperature correction to the current output signal that corrects the current output signal based on a temperature of the magnetic sensor; providing a current correction to the current output signal that removes portions of the magnetic field caused by the other battery cells or electrically conductive components within the battery module; converting the corrected current output signal to the battery cell SOC of the battery cell; determining whether a battery cell voltage of the battery cell is at a voltage landmark location identified in a graph line that defines a relationship between the battery cell voltage and the battery cell SOC, where the voltage landmark location has a slope in the graph line that is greater than a predetermined slope; using the battery cell voltage to determine the battery cell SOC instead of the corrected current output signal if the battery cell voltage is at the voltage landmark location; determining whether the magnetic field is at a magnetic landmark location identified in a graph line that defines a relationship between the magnetic field of the battery cell and the battery cell SOC, where the magnetic landmark location has a change in slope magnitude or direction relative to the rest of the graph line; and using the magnetic field to determine the battery cell SOC instead of the corrected current output signal if the magnetic field is at the magnetic landmark location. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A system for converting a current output signal from a magnetic sensor that measures a magnetic field in a battery cell to a battery cell state-of-charge (SOC), said system comprising:
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means for providing an offset correction to the current output signal that calibrates the current output signal to a known magnetic field strength; means for providing a temperature correction to the current output signal that corrects the current output signal based on a temperature of the magnetic sensor; means for providing a current correction to the current output signal that removes portions of the magnetic field caused by other battery cells; and means for converting the corrected current output signal to the battery cell SOC. - View Dependent Claims (20)
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Specification