Method and device for determining available electric power in an instrument panel
First Claim
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1. A method for ascertaining electric power provided by a battery and a generator, available in an energy supply system, comprising:
- ascertaining a battery reserve power in accordance with a battery model, wherein the battery model is implemented as one of a software program stored on a storage medium and a hardware circuit;
ascertaining a generator reserve power in accordance with a generator model, wherein the generator model is implemented as one of a software program stored on a storage medium and a hardware circuit;
calculating a total available reserve power from the battery reserve power and the generator reserve power;
receiving, as input quantities, by the generator model one of;
a generator voltage, a generator speed, and a generator temperature; and
a plurality of quantities from which the generator voltage, the generator speed, and the generator temperature are derivable;
up to a predefined degree of utilization of the generator, estimating a generator voltage supplied to the generator model; and
above the predefined degree of utilization, calculating the generator voltage from a battery voltage and a voltage drop on a connection line, wherein the calculating involves a different methodology than the estimating;
wherein a plurality of predefined limiting values are definable for a first load of the energy supply system, and wherein, if one of the plurality of predefined limiting values is undershot, one of dimming and switching off at least one predefined electrical load.
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Abstract
The present invention relates to a method and a device for ascertaining the electric power, provided by a battery and a generator, available in a motor-vehicle electrical system. To determine the available electric power, both a battery model and a generator model are provided, from which the battery reserve power and the generator reserve power may be ascertained. The total power available in the vehicle electrical system is finally determined from the battery reserve power and the generator reserve power.
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Citations
14 Claims
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1. A method for ascertaining electric power provided by a battery and a generator, available in an energy supply system, comprising:
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ascertaining a battery reserve power in accordance with a battery model, wherein the battery model is implemented as one of a software program stored on a storage medium and a hardware circuit; ascertaining a generator reserve power in accordance with a generator model, wherein the generator model is implemented as one of a software program stored on a storage medium and a hardware circuit; calculating a total available reserve power from the battery reserve power and the generator reserve power; receiving, as input quantities, by the generator model one of; a generator voltage, a generator speed, and a generator temperature; and a plurality of quantities from which the generator voltage, the generator speed, and the generator temperature are derivable; up to a predefined degree of utilization of the generator, estimating a generator voltage supplied to the generator model; and above the predefined degree of utilization, calculating the generator voltage from a battery voltage and a voltage drop on a connection line, wherein the calculating involves a different methodology than the estimating; wherein a plurality of predefined limiting values are definable for a first load of the energy supply system, and wherein, if one of the plurality of predefined limiting values is undershot, one of dimming and switching off at least one predefined electrical load. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A device for ascertaining electric power provided by a battery and a generator available in an energy supply system, comprising:
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a processing unit including; a battery model adapted to ascertain a first reserve power available from the battery, wherein the battery model is implemented as one of a software program stored on a storage medium and a hardware circuit; and a generator model adapted to ascertain a second reserve power available from the generator, wherein the generator model is implemented as one of a software program stored on a storage medium and a hardware circuit;
wherein;the processing unit is configured to calculate a total reserve power available in the energy supply system from the first reserve power and the second reserve power; the generator model receives, as input quantities, one of; a generator or voltage, a generator speed, and a generator temperature; and a plurality of quantities from which the generator voltage, the generator speed and the generator temperature are derivable; up to a predefined degree of utilization of the generator, the processing unit is configured to estimate a generator voltage supplied to the generator model; above the predefined degree of utilization, the processing unit is configured to calculate the generator voltage from a battery voltage and a voltage drop on a connection line, the calculating involving a different methodology than the estimating; and a plurality of predefined limiting values are definable for a first load of the energy supply system, and if one of the plurality of predefined limiting values is undershot, one of dimming and switching off at least one predefined electrical load is performed. - View Dependent Claims (13, 14)
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Specification