ELECTRIC OR HYBRID VEHICLE BATTERY PACK VOLTAGE MEASUREMENT
First Claim
1. A vehicle, comprising:
- a battery pack having individual cells;
an electric machine powered by the battery pack to propel the vehicle; and
a controller programmed to control the battery in response to a published pack voltage that incorporates a pack voltage offset updated after pack voltage variation is less than a threshold and is based on a difference between a measured pack voltage and a sum of voltages of the individual cells.
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Accused Products
Abstract
Systems and methods for measuring voltage of a battery pack for an electrified vehicle, such as an electric or hybrid vehicle, include measuring individual cell voltages and using the individual measurements to periodically update an adjustment or offset applied to the battery pack measurement to improve accuracy of the battery pack measurement. Individual cell voltage measurements may be periodically sampled and combined with the result compared to the pack voltage under predetermined operating conditions, such as when voltage changes or variation are small. A sliding window of voltage differences that satisfy one or more specified conditions, such as being within a range of a previously determined value, may be used to generate the adjustment or offset.
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Citations
20 Claims
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1. A vehicle, comprising:
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a battery pack having individual cells; an electric machine powered by the battery pack to propel the vehicle; and a controller programmed to control the battery in response to a published pack voltage that incorporates a pack voltage offset updated after pack voltage variation is less than a threshold and is based on a difference between a measured pack voltage and a sum of voltages of the individual cells. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A control method for a vehicle having a battery pack including battery cells coupled to a processor programmed to perform the method, comprising:
controlling, by the processor, the battery pack using a published pack voltage based on a voltage offset adjusted using an average difference between a measured battery pack voltage and a sum of measured battery cell voltages, the published pack voltage being the voltage offset combined with the measured battery pack voltage. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A computer program product embodied in non-transitory computer readable storage having instructions for programming a processor to control a vehicle having a battery pack with individual battery cells, comprising instructions for:
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monitoring measured battery pack voltage variation; and adjusting a measured pack voltage by an offset that is updated based on a difference between the measured pack voltage and a sum of voltages of the individual battery cells while the variation is below a threshold. - View Dependent Claims (18, 19, 20)
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Specification