ADAPTIVE METHOD FOR DETERMINING THE POWER THAT CAN BE MAXIMALLY OUTPUTTED OR ABSORBED BY A BATTERY
First Claim
1. A method for determining the power that can be provided or absorbed by a battery, comprising:
- determining a state variable of the battery;
determining a power that can be provided or absorbed by the battery during a predetermined load time period on the basis of a table of power values and the state variable of the battery, the state variable of the battery acting as access parameter for the table;
measuring a load on the battery on the basis of an operational parameter of the battery;
measuring a load time period in which the load on the battery is provided;
comparing the measured load time period with a comparison region which contains the predetermined load time period; and
implementing a correction routine when the load time period is in the comparison region;
wherein the correction routine comprises;
at least comparing the power value from the table and the measured load,determining a correction value for the power value from the table on the basis of a result of the comparison of the power value from the table and the measured load, andcorrecting the power value from the table on the basis of the correction value.
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Accused Products
Abstract
A method for determining the power that can be provided or absorbed by a battery includes determining a state variable of the battery. A power that can be provided or absorbed by the battery during a specified load period is determined using a table of power values and the state variable of the battery. The state variable of the battery is used as an access parameter for the table. A load of the battery is measured using an operating parameter of the battery. A load period in which the load of the battery is given is measured. The measured load period is compared with a comparison range that contains the specified load period. A correction routine is carried out if the load period lies in the comparison range. A battery system includes a controller for carrying out the method. A motor vehicle includes the battery system.
83 Citations
10 Claims
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1. A method for determining the power that can be provided or absorbed by a battery, comprising:
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determining a state variable of the battery; determining a power that can be provided or absorbed by the battery during a predetermined load time period on the basis of a table of power values and the state variable of the battery, the state variable of the battery acting as access parameter for the table; measuring a load on the battery on the basis of an operational parameter of the battery; measuring a load time period in which the load on the battery is provided; comparing the measured load time period with a comparison region which contains the predetermined load time period; and implementing a correction routine when the load time period is in the comparison region; wherein the correction routine comprises; at least comparing the power value from the table and the measured load, determining a correction value for the power value from the table on the basis of a result of the comparison of the power value from the table and the measured load, and correcting the power value from the table on the basis of the correction value. - View Dependent Claims (2, 3, 4, 5, 6, 9, 10)
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7. A battery system, comprising:
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a battery, and a battery management unit connected to the battery, the battery management unit including; at least one current measurement unit which is configured to measure a battery current of the battery, a voltage measurement unit which is configured to measure a battery voltage of the battery, a temperature sensor which is configured to measure a temperature of the battery, and a controller which is connected to the current measurement unit, the voltage measurement unit, and the temperature sensor, the controller being configure to; determine a state variable of the battery, determine a power that can be provided or absorbed by the battery during a predetermined load time period on the basis of a table of power values and the state variable of the battery, the state variable of the battery acting as access parameter for the table, measure a load on the battery on the basis of an operational parameter of the battery, measure a load time period in which the load on the battery is provided, compare the measured load time period with a comparison region which contains the predetermined load time period, and implement a correction routine when the load time period is in the comparison region, wherein the correction routine comprises; at least comparing the power value from the table and the measured load, determining a correction value for the power value from the table on the basis of a result of the comparison of the power value from the table and the measured load, and correcting the power value from the table on the basis of the correction value.
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8. A motor vehicle, comprising:
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an electric drive motor configured to move the motor vehicle, and a battery system connected to the electric drive motor, the battery system including; a battery, and a battery management unit connected to the battery, the battery management unit including; at least one current measurement unit which is configured to measure a battery current of the battery, a voltage measurement unit which is configured to measure a battery voltage of the battery, a temperature sensor which is configured to measure a temperature of the battery, and a controller which is connected to the current measurement unit, the voltage measurement unit, and the temperature sensor, the controller being configure to; determine a state variable of the battery, determine a power that can be provided or absorbed by the battery during a predetermined load time period on the basis of a table of power values and the state variable of the battery, the state variable of the battery acting as access parameter for the table, measure a load on the battery on the basis of an operational parameter of the battery, measure a load time period in which the load on the battery is provided, compare the measured load time period with a comparison region which contains the predetermined load time period, and implement a correction routine when the load time period is in the comparison region, wherein the correction routine comprises;
at least comparing the power value from the table and the measured load,
determining a correction value for the power value from the table on the basis of a result of the comparison of the power value from the table and the measured load, and
correcting the power value from the table on the basis of the correction value.
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Specification