Apparatus of SOC estimation during plug-in charge mode
First Claim
1. A method for estimating parameters of a rechargeable energy storage system during a plug-in charge mode, said method comprising:
- reading a first measured voltage and a measured current from the rechargeable energy storage system while charging the rechargeable energy storage system during a plug-in charge mode;
interrupting the charge to stop current flow to the rechargeable energy storage system for a predetermined period of time;
reading a second measured voltage during the charge interrupt;
calculating a resistance based on the first measured voltage, the second measured voltage and the measured current;
calculating an open circuit voltage of the rechargeable energy storage system based on the resistance, the second measured voltage, and the measured current;
calculating a residual voltage to compensate for an offset due to a limited period of rest relating to the predetermined period of time;
calculating an open circuit voltage of the rechargeable energy storage system based on the resistance, the second measured voltage, the measured current and the residual voltage; and
determining the state-of-charge for the rechargeable energy storage system using the open circuit voltage.
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Abstract
A system and method for estimating parameters of a rechargeable energy storage system during a plug-in charge mode include reading a first measured voltage and a measured current from the rechargeable energy storage system while charging the rechargeable energy storage system during a plug-in charge mode, interrupting the charge to stop current flow to the rechargeable energy storage system for a predetermined period of time, reading a second measured voltage during the charge interrupt, calculating a resistance based on the first measured voltage, the second measured voltage and the measured current, calculating an open circuit voltage of the rechargeable energy storage system based on the resistance, the second measured voltage, the measured current and determining the state-of-charge for the rechargeable energy storage system using the open circuit voltage.
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Citations
16 Claims
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1. A method for estimating parameters of a rechargeable energy storage system during a plug-in charge mode, said method comprising:
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reading a first measured voltage and a measured current from the rechargeable energy storage system while charging the rechargeable energy storage system during a plug-in charge mode; interrupting the charge to stop current flow to the rechargeable energy storage system for a predetermined period of time; reading a second measured voltage during the charge interrupt; calculating a resistance based on the first measured voltage, the second measured voltage and the measured current; calculating an open circuit voltage of the rechargeable energy storage system based on the resistance, the second measured voltage, and the measured current; calculating a residual voltage to compensate for an offset due to a limited period of rest relating to the predetermined period of time; calculating an open circuit voltage of the rechargeable energy storage system based on the resistance, the second measured voltage, the measured current and the residual voltage; and determining the state-of-charge for the rechargeable energy storage system using the open circuit voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A non-transitory computer-readable storage medium with an executable program stored thereon, wherein the program instructs a controller to estimate parameters of a rechargeable energy storage system during a plug-in charge mode by performing the steps comprising:
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measuring a first voltage and a current of a rechargeable energy storage system during a plug-in charge mode; pausing the charge for a predetermined period of time; measuring a second voltage during the charge interrupt; calculating a resistance based on the first measured voltage, the second measured voltage and the measured current; calculating an open circuit voltage based on the resistance and the second voltage; calculating a residual voltage to compensate for an offset due to a limited period of rest relating to the predetermined period of time; calculating an open circuit voltage of the rechargeable energy storage system based on the resistance, the second measured voltage, the measured current and the residual voltage; and determining the state-of-charge using the open circuit voltage. - View Dependent Claims (11, 12, 13)
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14. A system for estimating parameters of a rechargeable energy storage system during a plug-in charge mode, the system comprising a controller being programmed to:
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initiate the plug-in charge mode to charge the rechargeable energy storage system for a first predetermined period of time; measure a first voltage and a current of the rechargeable energy storage system during the plug-in charge mode; pause the charge for a second predetermined period of time; measure a second voltage during the charge interrupt; calculate a resistance based on the first measured voltage, the second measured voltage and the measured current; calculate an open circuit voltage based on the resistance and the second voltage; calculate a residual voltage to compensate for an offset due to a limited period of rest relating to the second predetermined period of time; calculate an open circuit voltage of the rechargeable energy storage system based on the resistance, the second measured voltage, the measured current and the residual voltage; and determine the state-of-charge using the open circuit voltage. - View Dependent Claims (15, 16)
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Specification