Frequency based battery model parameter estimation
First Claim
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1. A vehicle comprising:
- a battery pack; and
at least one controller programmed tocontrol operation of the battery pack in response to (i) parameter values indicative of an internal resistance of the battery pack that are based on terminal voltage data of the battery pack having frequency content less than a threshold frequency and (ii) parameter values indicative of an internal impedance of the battery pack that are based on terminal voltage data of the battery pack having frequency content greater than the threshold frequency.
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Abstract
A hybrid powertrain system includes a battery and at least one controller. The at least one controller is configured to determine instantaneous battery power limits during operation of the system using filtered battery voltage signals and current input signals. The at least one controller is further configured to separate medium-to-high frequency dynamics of the measured battery voltage. The filtering process, in certain examples, is realized using a low pass filter or a high pass filter. The at least one controller is further configured to correlate the medium-to-high frequency loads to estimate battery parameters and determine battery dynamics using, in one example, an Extended Kalman Filter.
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Citations
19 Claims
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1. A vehicle comprising:
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a battery pack; and at least one controller programmed to control operation of the battery pack in response to (i) parameter values indicative of an internal resistance of the battery pack that are based on terminal voltage data of the battery pack having frequency content less than a threshold frequency and (ii) parameter values indicative of an internal impedance of the battery pack that are based on terminal voltage data of the battery pack having frequency content greater than the threshold frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A battery management method comprising:
controlling operation of a battery pack in response to parameter values indicative of an internal resistance of the battery pack that are based on terminal voltage data of the battery pack having frequency content less than a threshold frequency and in response to parameter values indicative of an internal impedance of the battery pack that are based on the terminal voltage data having frequency content greater than the threshold frequency. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A hybrid powertrain system comprising:
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a battery pack having one or more battery cells; and at least one controller programmed to implement a model of the battery pack, filter terminal voltage data of the battery pack into high-frequency content having frequencies greater than a threshold and low-frequency content having frequencies less than the threshold, and control operation of the battery pack in response to predicted available battery power derived from (i) parameter values indicative of an internal resistance of the battery pack that are based on the low-frequency content and (ii) parameter values indicative of an internal impedance of the battery pack that are based on the high-frequency content. - View Dependent Claims (17, 18, 19)
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Specification