Method for Determining the Internal Resistance of a Battery
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Abstract
A method for determining the internal resistance of a battery, in particular a lead-acid vehicle battery, and an associated device for performing the method are described, in which differential values are calculated from the measured values for the voltage and the current, and these differential values are processed with the aid of a regulator, such as an integrator or a PID regulator. A signal results at the output of the regulator, which corresponds to the reciprocal value of the internal resistance of the battery. This signal is taken into consideration again in each following computing step. The functional capability may be inferred from its internal resistance.
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Citations
19 Claims
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1-9. -9. (canceled)
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10. A method for determining an internal resistance of a battery, the method comprising:
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measuring the current and the voltage; performing an analysis based on measured current values and measured voltage values; determining a voltage difference; performing a current reconstruction from the determined voltage and a reciprocal value of an internal resistance of the battery; determining a current difference between the determined current reconstruction and another current difference that is ascertained from measured currents; normalizing the current difference; and supplying the normalized current to a regulator, at whose output the reciprocal value for the internal resistance of the battery results. - View Dependent Claims (11, 12, 13, 19)
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14. A device for determining an internal resistance of a vehicle battery, the device comprising:
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a determining arrangement to determine a voltage difference; a current reconstruction arrangement to determine a current reconstruction; a difference generator to generate a difference; one of a multiplication arrangement and a division arrangement; and a regulator; wherein to determine the internal resistance of the battery, the following are performed; measuring the current and the voltage; performing an analysis based on measured current values and measured voltage values; determining the voltage difference; performing the current reconstruction from the determined voltage and a reciprocal value of an internal resistance of the battery; determining the current difference between the determined current reconstruction and another current difference that is ascertained from measured currents; normalizing the current difference; and supplying the normalized current to the regulator, at whose output the reciprocal value for the internal resistance of the battery results. - View Dependent Claims (15, 16, 17, 18)
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Specification