Electric or hybrid vehicle battery pack voltage measurement functional assessment and redundancy
First Claim
1. A vehicle, comprising:
- a traction battery pack having a high voltage bus and a plurality of individual battery cells, the traction battery pack including a plurality of internal circuits that provides a corresponding plurality of independent internal measurements of traction battery pack voltage;
a plurality of external circuits external to the traction battery pack and coupled to the high voltage bus providing a corresponding plurality of independent external measurements of the traction battery pack voltage;
an electric machine powered by the traction battery pack via one of the plurality of external circuits to propel the vehicle; and
a controller in communication with the plurality of internal circuits and the plurality of external circuits and programmed to publish a pack voltage to a vehicle network, the pack voltage corresponding to a first independent internal measurement in response to a voltage differential among all of the independent internal measurements being less than a threshold, a second independent internal measurement in response to the voltage differential exceeding the threshold, and a statistical measure of the independent internal and external measurements in response to any of the internal measurements being invalid.
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Abstract
Systems and methods for measuring voltage of a battery pack for an electrified vehicle, such as an electric or hybrid vehicle, include a battery having internal circuits that measure pack voltage and individual cell voltages, an electric machine powered by the battery to propel the vehicle via an external circuit that measures the pack voltage, and a processor programmed to publish the pack voltage to a vehicle network based on a first internal circuit voltage in response to a voltage differential among the internal circuits being less than a threshold and based on the individual cell voltages otherwise. The published pack voltage may be used by one or more battery or vehicle controllers to control various battery and vehicle functions including engine starting in a hybrid vehicle and battery charging and discharging, for example.
39 Citations
19 Claims
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1. A vehicle, comprising:
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a traction battery pack having a high voltage bus and a plurality of individual battery cells, the traction battery pack including a plurality of internal circuits that provides a corresponding plurality of independent internal measurements of traction battery pack voltage; a plurality of external circuits external to the traction battery pack and coupled to the high voltage bus providing a corresponding plurality of independent external measurements of the traction battery pack voltage; an electric machine powered by the traction battery pack via one of the plurality of external circuits to propel the vehicle; and a controller in communication with the plurality of internal circuits and the plurality of external circuits and programmed to publish a pack voltage to a vehicle network, the pack voltage corresponding to a first independent internal measurement in response to a voltage differential among all of the independent internal measurements being less than a threshold, a second independent internal measurement in response to the voltage differential exceeding the threshold, and a statistical measure of the independent internal and external measurements in response to any of the internal measurements being invalid. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A vehicle comprising:
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a battery having internal circuits that measure pack voltage and individual cell voltages; an electric machine powered by the battery to propel the vehicle via an external circuit that measures the pack voltage; and a processor programmed to publish the pack voltage based on a first internal circuit voltage in response to a voltage differential among the internal circuits being less than a threshold and based on the individual cell voltages otherwise. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A control method for an electric vehicle having a traction battery coupled to an electric machine, comprising:
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outputting, by a vehicle processor, a pack voltage to a vehicle network, the pack voltage based on internal voltage measurements in response to a voltage differential among the internal voltage measurements being less than a threshold, and based on a statistical function of both the internal voltage measurements and published voltage measurements from external circuits otherwise. - View Dependent Claims (18, 19)
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Specification