State of charge method and apparatus
First Claim
1. A method for determining a state of charge (SOC) of a battery system based upon an equivalent circuit of said battery system using least square regression comprising:
- determining an open circuit potential and resistance of said equivalent circuit;
providing a plurality of data points based upon determinations including measurement or prior computation;
weighting said plurality of data points; and
computing values of said resistance and open-circuit potential based upon weighted data points using least square analysis expressed in recursive formulas to determine the SOC.
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Abstract
A method for determining state of charge (SOC) of a battery system based upon an equivalent circuit of the battery system. A potential and resistance of the equivalent circuit are computed. The method uses a least squares regression means, and includes: providing a plurality of data points as a starting point based upon determinations including measurement or prior computation, wherein the determinations include a determination of a voltage of the battery system; weighting the plurality of data points; and computing values of the resistance and potential based upon weighted data points using recursive formulas, wherein only a state at a previous time is reflected respectively.
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Citations
21 Claims
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1. A method for determining a state of charge (SOC) of a battery system based upon an equivalent circuit of said battery system using least square regression comprising:
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determining an open circuit potential and resistance of said equivalent circuit;
providing a plurality of data points based upon determinations including measurement or prior computation;
weighting said plurality of data points; and
computing values of said resistance and open-circuit potential based upon weighted data points using least square analysis expressed in recursive formulas to determine the SOC. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for determining a state of charge (SOC) in a battery system based on determining values of a resistance R and an open circuit voltage Voc, respectively, comprising:
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creating at least two data points based upon measurement or prior computation;
establishing a linear relationship using said resistance R and said open circuit voltage Voc;
applying least square analysis upon said linear relationship;
formulating a recursive relationship, wherein a first state at a backward time increment solely determines a current state after said backward time increment, said recursive relationship being the summation of said first state manifested in a recast summation derived from integrals, and a data point at current time. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A vehicle powertrain control system, comprising:
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a battery pack;
a power inverter coupled to said battery pack;
a controller controlling said power inverter, said controller monitoring a state of charge (SOC) of said battery pack; and
a program product for computing a resistance and an open circuit voltage both being functionally related to said SOC, said program product being associated to said controller. - View Dependent Claims (19, 20, 21)
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Specification