MODEL-BASED DIAGNOSIS FOR BATTERY VOLTAGE
First Claim
1. A vehicle comprising:
- a traction battery including a plurality of cells; and
at least one controller programmed to (i) output impedance parameters based on a measured voltage at a plurality of time steps while a magnitude of a difference between the measured voltage and an impedance parameter based estimated voltage is less than a predetermined value, and (ii) otherwise, output impedance parameters based on impedance parameter estimates from a selected previous one of the time steps.
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Abstract
A hybrid or electric vehicle includes a traction battery. A battery measurement diagnostic system compares a measured voltage and an estimated voltage. The estimated voltage is based on impedance parameter estimates and an equivalent circuit model of a battery. When a magnitude of a difference between the measured and estimated voltages is greater than a threshold, the impedance parameter estimates are based on impedance parameter estimates from a previous time step. If the magnitude exceeds the threshold for a predetermined number of time steps, a voltage measurement diagnostic flag is output. The logic minimizes the impact of voltage measurement spikes on estimated quantities and may indicate the condition to an operator.
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Citations
20 Claims
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1. A vehicle comprising:
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a traction battery including a plurality of cells; and at least one controller programmed to (i) output impedance parameters based on a measured voltage at a plurality of time steps while a magnitude of a difference between the measured voltage and an impedance parameter based estimated voltage is less than a predetermined value, and (ii) otherwise, output impedance parameters based on impedance parameter estimates from a selected previous one of the time steps. - View Dependent Claims (2, 3, 4, 5)
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6. A vehicle comprising:
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a traction battery including a plurality of cells; and at least one controller programmed to, in response to a magnitude of a difference between a measured cell voltage and an impedance parameter based estimated cell voltage at each of a plurality of time steps being greater than a predetermined value for a predetermined number of the time steps, output a diagnostic flag. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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13. A method of battery voltage estimation, comprising:
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measuring, by a controller, a voltage at a plurality of time steps; outputting an estimated voltage based on impedance parameter estimates while a difference magnitude between the voltage and the estimated voltage is less than a predetermined value; and outputting the estimated voltage based on impedance parameters from a selected previous one of the time steps while the difference magnitude is greater than the predetermined value. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification