Vehicle battery state of charge indicator
First Claim
1. A system for modeling a target battery installed on a motor vehicle comprising:
- a crank started engine;
a starter motor for the crank started engine connected for energization to the target battery;
a voltage sensor connected to provide measurements of target battery voltage;
a temperature sensor providing a measurement of a temperature correspond to target battery temperature; and
a vehicle body computer connected to receive the measurements of temperature and target battery voltage and having a stored program implementing an energy flow model for the target battery and stored data relating to mode parameters including target battery rated capacity, model battery corrected capacity and cranking current required for engine start over a temperature range, the stored program being responsive upon execution by the vehicle body computer for, comparing the target battery voltage measurements and predicted battery open circuit voltage to generate an error current proportional to battery current and using the error current and temperature measurements during engine cranking and time to crank to generate an updated battery corrected capacity.
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Accused Products
Abstract
A system for modeling a battery installed on a motor vehicle including a crank started engine, a voltage sensor connected to provide measurements of battery voltage and a temperature sensor providing temperature measurements provides for correcting capacity of the battery starting from the battery'"'"'s rated capacity. A vehicle body computer implements the model through a stored program implementing an energy flow model of the target battery and stored data relating to model parameters including battery rated capacity and cranking current required for engine start over a temperature range. The stored program being responsive upon execution by the vehicle body computer for using the battery voltage measurements and temperature measurements during engine cranking to correct battery capacity.
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Citations
5 Claims
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1. A system for modeling a target battery installed on a motor vehicle comprising:
- a crank started engine;
a starter motor for the crank started engine connected for energization to the target battery;
a voltage sensor connected to provide measurements of target battery voltage;
a temperature sensor providing a measurement of a temperature correspond to target battery temperature; and
a vehicle body computer connected to receive the measurements of temperature and target battery voltage and having a stored program implementing an energy flow model for the target battery and stored data relating to mode parameters including target battery rated capacity, model battery corrected capacity and cranking current required for engine start over a temperature range, the stored program being responsive upon execution by the vehicle body computer for, comparing the target battery voltage measurements and predicted battery open circuit voltage to generate an error current proportional to battery current and using the error current and temperature measurements during engine cranking and time to crank to generate an updated battery corrected capacity. - View Dependent Claims (2, 3)
- a crank started engine;
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4. A control system for a motor vehicle equipped with an electrical battery plant, a starter motor and a crank started engine, the control system comprising:
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a voltage sensor connected to provide measurements of voltage of the electrical battery plant; a temperature sensor providing a measurement of a temperature expected to correspond to battery temperature; a vehicle body computer connected to receive the measurements of temperature and measured voltage and having a stored program for modeling battery condition and generating an estimated current flow to and from the electrical battery plant; the stored program providing a module for an energy flow module generating battery state of charge and state of recovery information, a battery capacity calculation module providing estimated battery current, a model parameter module and a predicted voltage module, the battery capacity calculation module being responsive to an error signal generated from actual and predicted voltage, temperature and a previous estimate of battery capacity or an exogenously supplied value for battery capacity for generating an updated estimate of battery capacity and a current estimate of net battery current flow. - View Dependent Claims (5)
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Specification