ASSESSING THE QUANTITY OF ENERGY IN A MOTOR VEHICLE BATTERY
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Abstract
A method for evaluating a quantity of energy at constant power of a battery includes determining a value of a capacity parameter for the battery, constructing a table of values for a parameter of voltage across terminals of the battery as a function of a value of a current parameter, for N values of a state of charge parameter, determining a value of an internal resistance parameter for the battery, providing a table of values of an open-circuit voltage parameter, estimating a value of the state of charge parameter at an initial time, and estimating a quantity of energy parameter between a final and initial states of charge using a function whose variable is the state of charge parameter and whose parameters are said value of the capacity parameter for the battery, said value of the internal resistance parameter, and said value of the open-circuit voltage parameter.
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Citations
20 Claims
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1-10. -10. (canceled)
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11. A method for evaluating a quantity of energy at constant power of a battery of an automobile vehicle, said quantity of energy corresponding to a extractible quantity of energy or to a quantity of energy to be accumulated, said method comprising:
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(a) determining a value of a capacity parameter for the battery; (b) constructing, during a charge phase of the battery, a table of values for a parameter of voltage across terminals of the battery as a function of a value of a current parameter for N values of a state of charge parameter; (c) determining a value of an internal resistance parameter for the battery as a function of a state of charge parameter for said battery based on the table constructed at the step (b); (d) providing a table of values of an open-circuit voltage parameter for the battery as a function of the state of charge parameter for the battery; (e) estimating a value of the state of charge parameter for the battery at an initial time, corresponding to an initial state of charge of the battery; and (f) estimating by calculation a value of a quantity of energy parameter between a final state of charge and said initial state of charge using a function whose variable is the state of charge parameter and whose parameters are said value of the capacity parameter for the battery, said value of the internal resistance parameter and said value of the open-circuit voltage parameter. - View Dependent Claims (12, 13, 14, 17, 18)
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15. The method as claimed in claim H, in which the step (e) for estimating the value of the initial state of charge parameter comprises, at the initial time:
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(i) measuring the value of the parameter of voltage across the terminals of the battery and the value of the parameter of current flowing in the battery when said value of the current parameter is stable for a predetermined period of time during a discharge phase of the battery, and (ii) deducing from the measuring the value of the initial state of charge parameter based on the table constructed at the step (b). - View Dependent Claims (16)
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19. A device for evaluating a quantity of energy of a battery of an automobile vehicle at constant power, said quantity of energy corresponding to an extractible quantity of energy or to a quantity of energy to be accumulated, comprising:
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receiving means to receive various values of parameters including a value of a parameter of voltage across terminals of the battery, a value of a current parameter, and potentially a value of a time parameter; means for storing the values received by the receiving means and storing a table of values of a parameter of voltage across the terminals of the battery as a function of the value of a current parameter for N values of a state of charge parameter of said battery and a table of values of an open-circuit voltage parameter for the battery as a function of the state of charge parameter for the battery; and processing means for; determining a value of a capacity parameter for the battery, constructing a table of values of a parameter of voltage across the terminals of the battery as a function of the value of a current parameter for N values of a state of charge parameter for said battery, determining a value of an internal resistance parameter for the battery as a function of said state of charge parameter for said battery using the table constructed, estimating a value of the state of charge parameter for the battery at an initial time, corresponding to an initial state of charge of the battery, as a function of the table stored in the storage means, and estimating by calculation a value of quantity of energy parameter between a final state of charge and said initial state of charge using a function whose variable is the state of charge parameter and whose parameters are said value of the capacity parameter for the battery, said value of the internal resistance parameter and said value of the open-circuit voltage. - View Dependent Claims (20)
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Specification