Reduced central processing unit load and memory usage battery state of charge calculation
First Claim
1. A vehicle comprising:
- a battery pack including cells grouped into a plurality of subsets; and
a controller programmed to charge and discharge the battery pack according to a state of charge of the battery pack derived from an initial state of charge of each of the cells at vehicle activation and an electric charge accumulated or spent by each of less than all of the cells of each of the subsets since vehicle activation.
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Accused Products
Abstract
A vehicle having a battery pack with cells grouped into subsets and at least one controller programmed to charge and discharge the battery pack is disclosed. A control output is generated based on a pack state of charge derived from each cell'"'"'s initial state of charge at vehicle activation and an electric charge accumulated or spent by less than all of the cells of each of the subsets since vehicle activation. A method of estimating battery pack state of charge is disclosed in which a pack state of charge is calculated by identifying subsets of cells having similar properties and calculating an electric charge accumulated or spent for fewer than all of the cells of each subset. A cell state of charge is calculated for all cells based on an average electric charge accumulated or spent. The pack state of charge is based on all the cell states of charge.
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Citations
20 Claims
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1. A vehicle comprising:
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a battery pack including cells grouped into a plurality of subsets; and a controller programmed to charge and discharge the battery pack according to a state of charge of the battery pack derived from an initial state of charge of each of the cells at vehicle activation and an electric charge accumulated or spent by each of less than all of the cells of each of the subsets since vehicle activation. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of controlling a vehicle comprising:
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identifying a plurality of subsets of cells forming a battery pack, wherein the cells of each of the subsets have a specified set of cell parameter values falling within a specified range of values and wherein the specified range of values for each of the subsets is different; calculating an electric charge accumulated or spent by less than all of the cells of each of the subsets based on cell state of charge data; calculating an average electric charge accumulated or spent by the battery pack based on the electric charge accumulated or spent by less than all of the cells for each of the subsets; calculating a cell state of charge for each of the cells based on the average electric charge accumulated or spent by the battery pack; calculating a battery pack state of charge based on the cell states of charge; and generating a control output for the vehicle based on the battery pack state of charge. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method for estimating a battery pack state of charge comprising:
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grouping cells of the battery pack into a plurality of subsets; calculating a battery pack state of charge based on an initial state of charge of each of the cells at vehicle activation and an electric charge accumulated or spent by each of less than all of the cells of each of the subsets since vehicle activation; and outputting information based on the battery pack state of charge for vehicle control or display. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification