Method for determining performance information of a battery of a motor vehicle on-board power system that is connected to a direct current converter, and motor vehicle
First Claim
1. A method for determining a performance information of a battery of a first on-board power network of a motor vehicle, wherein the first on-board power network is connected to a DC converter, the method comprising:
- impressing, by the DC converter, at least one AC current with at least one predetermined frequency into the first on-board power network;
deriving the performance information, including capacity information, from at least one first electrical parameter at an output of the DC converter to the first on-board power network and from at least one second electrical parameter describing a reaction of the battery to the impressed at least one AC current;
determining a plurality of component values of an equivalent circuit of the battery using the at least one first electrical parameter and the at least one second electrical parameter,wherein the determining the plurality of component values comprises;
using the at least one AC current, having a plurality of different predetermined frequencies that overlap one another, wherein the number of the plurality of different predetermined frequencies used is at least equal to the number of the plurality of component values to be determined;
orusing a plurality of AC currents, each impressed in a temporal sequence; and
deriving the capacity information from the plurality of component values.
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Abstract
A method for determining a performance information, including a capacity information, of a battery of a motor vehicle on-board power network connected to a DC converter is disclosed. The DC converter is configured to impress at least one AC current with at least one predetermined frequency into the on-board power network. The capacity information is derived from at least one first electrical parameter at an output of the DC converter to the on-board power network and from at least one second electrical parameter that describes a reaction of the battery to the impressed AC current. A motor vehicle configured to perform the method is also disclosed.
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Citations
14 Claims
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1. A method for determining a performance information of a battery of a first on-board power network of a motor vehicle, wherein the first on-board power network is connected to a DC converter, the method comprising:
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impressing, by the DC converter, at least one AC current with at least one predetermined frequency into the first on-board power network; deriving the performance information, including capacity information, from at least one first electrical parameter at an output of the DC converter to the first on-board power network and from at least one second electrical parameter describing a reaction of the battery to the impressed at least one AC current; determining a plurality of component values of an equivalent circuit of the battery using the at least one first electrical parameter and the at least one second electrical parameter, wherein the determining the plurality of component values comprises; using the at least one AC current, having a plurality of different predetermined frequencies that overlap one another, wherein the number of the plurality of different predetermined frequencies used is at least equal to the number of the plurality of component values to be determined;
orusing a plurality of AC currents, each impressed in a temporal sequence; and deriving the capacity information from the plurality of component values. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A motor vehicle, comprising an energy management system, further comprising:
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a battery of a first on-board power network; a DC converter, connected to the battery, wherein the DC converter is configured to; impress at least one AC current with at least one predetermined frequency into the first on-board power network; and a controller, connected to the DC converter, wherein the controller is configured to; derive performance information of the battery, the performance information including capacity information, from at least one first electrical parameter at an output of the DC converter to the first on-board power network and from at least one second electrical parameter describing a reaction of the battery to the impressed at least one AC current; determine a plurality of component values of an equivalent circuit of the battery using the at least one first electrical parameter and the at least one second electrical parameter, wherein, to determine the plurality of component values, the controller is further configured to; use the at least one AC current, having a plurality of different predetermined frequencies that overlap one another, wherein the number of the plurality of different predetermined frequencies used is at least equal to the number of the plurality of component values to be determined;
oruse a plurality of AC currents, each impressed in a temporal sequence; and derive the capacity information from the plurality of component values. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification