Lead acid state of charge estimation for auto-stop applications
First Claim
1. A method, comprising:
- predicting terminal voltage of a battery module in a vehicle using a battery control module, wherein predicting the terminal voltage comprises;
determining a gassing current of the battery module using a gassing current model, wherein the gassing current quantifies terminal current that is not used to charge the battery module; and
calculating the predicted terminal voltage based at least in part on a measurement model and the determined gassing current;
measuring terminal voltage of the battery module using a sensor communicatively coupled to the battery control module;
determining a corrected state of the battery module using the battery control module by minimizing error between the predicted terminal voltage and the measured terminal voltage; and
controlling operation of the vehicle using a vehicle control module based at least in part on the corrected state of the battery module, wherein the corrected state of the battery module comprises a state of charge of the battery module.
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Abstract
The present disclosure describes a method that includes predicting terminal voltage of a battery module in a vehicle using a battery control module. Predicting the terminal voltage includes determining a gassing current of the battery module using a gassing current model, in which the gassing current quantifies terminal current that is not used to charge the battery module, and calculating the predicted terminal voltage based at least in part on a measurement model and the determined gassing current. The method also includes measuring terminal voltage of the battery module using a sensor communicatively coupled to the battery control module, and determining a corrected state of the battery module using the battery control module by minimizing a difference between the predicted terminal voltage and the measured terminal voltage. In other words, the corrected state of the battery (e.g., corrected state of charge) may be more accurately determined using the measurement model and the gassing current model. As such, this may provide more efficient use of energy.
10 Citations
23 Claims
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1. A method, comprising:
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predicting terminal voltage of a battery module in a vehicle using a battery control module, wherein predicting the terminal voltage comprises; determining a gassing current of the battery module using a gassing current model, wherein the gassing current quantifies terminal current that is not used to charge the battery module; and calculating the predicted terminal voltage based at least in part on a measurement model and the determined gassing current; measuring terminal voltage of the battery module using a sensor communicatively coupled to the battery control module; determining a corrected state of the battery module using the battery control module by minimizing error between the predicted terminal voltage and the measured terminal voltage; and controlling operation of the vehicle using a vehicle control module based at least in part on the corrected state of the battery module, wherein the corrected state of the battery module comprises a state of charge of the battery module. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A tangible, non-transitory, computer-readable medium storing a plurality of instructions executable by a processor of a battery control module in a vehicle, the instructions comprising instructions to:
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predict terminal voltage of a battery module in the vehicle using the processor, wherein the instruction to predict the terminal voltage comprises instructions to; determine a gassing current of the battery module using a gassing current model, wherein the gassing current quantifies terminal current that is not used to charge the battery module; and calculate the predicted terminal voltage using a measurement model and the determined gassing current; measure terminal voltage of the battery module using a sensor communicatively coupled to the battery control module; determine a corrected state of the battery module using the processor by minimizing error between the predicted terminal voltage and the measured terminal voltage; and communicate the corrected state of the battery module to a vehicle control module to enable the vehicle control module to control operation of the vehicle based at least in part on the corrected state of the battery module. - View Dependent Claims (11, 12, 13)
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14. A vehicle, comprising:
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a battery module configured to supply electrical power to electrical systems in the vehicle; a battery control module configured to recursively determine a corrected state of the battery module using a state space model and a measurement model that predicts an operational parameter of the battery module, wherein the measurement model comprises a gassing current model that enables the battery control module to determine amount of current that is actually used to charge the battery module; and a vehicle control module configured to control operation of the vehicle based at least in part on the corrected state of the battery module. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
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22. A vehicle, comprising:
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a battery module configured to supply electrical power to electrical systems in the vehicle; a battery control module configured to recursively determine a corrected state of the battery module using a state space model and a measurement model that predicts an operational parameter of the battery module, wherein the measurement model comprises a gassing current module that enables the battery control module to determine amount of current that is actually used to charge the battery module; and an internal combustion engine configured to disable when the vehicle is stationary and to restart when propulsion is desired.
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23. A method, comprising:
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predicting terminal voltage of a battery module in a vehicle using a battery control module, wherein predicting the terminal voltage comprises; determining a gassing current of the battery module using a gassing current model, wherein the gassing current quantifies terminal current that is not used to charge the battery module; and calculating the predicted terminal voltage based at least in part on a measurement model and the determined gassing current; measuring terminal voltage of the battery module using a sensor communicatively coupled to the battery control module; predicting a state of the battery module using the battery control module based at least in part on a state space model, a corrected state of the battery module determined in a prior time step, and an operational parameter of the battery module determined in the prior time step, wherein the predicted terminal voltage is calculated based at least in part on the predicted state of the battery module; periodically calibrating the state space model by fully charging the battery module; and determining a corrected state of the battery module using the battery control module by minimizing error between the predicted terminal voltage and the measured terminal voltage.
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Specification