Method and device for determining the charge that can be drawn from an energy accumulator
First Claim
1. A device for ascertaining an amount of charge that is able to be drawn from an energy storage unit, up to at least one cutoff threshold, comprising:
- a charge predictor for calculating the amount of charge that is able to be drawn from the energy storage unit, up to the at least one cutoff threshold, wherein the calculated amount of charge is based on the product of a time value and a measured or a predetermined discharge current, and wherein the time value is based on an amount of time before the at least one cutoff threshold is met; and
an estimator for ascertaining at least one state variable, based on at least one operating performance quantity of the energy storage unit, wherein the charge predictor includes a mathematical energy storage model that receives the at least one state variable as input and provides an estimate of a variable value as a function of time, and wherein the time value is an estimated point in time when the variable value meets or exceeds the at least one cutoff threshold.
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Accused Products
Abstract
A device for ascertaining the charge able to be drawn from an energy store, in particular a battery, up to a specified cutoff, is provided. A particularly precise charge prediction may be achieved if a mathematical energy store model is used, which mathematically represents the electrical properties of the energy store and with the aid of which a charge predictor calculates the charge able to be drawn in the case of a specified discharge current. The charge predictor is connected with an estimator for a state variable and parameter, which estimator ascertains state variables and/or parameters for the mathematical energy store model from current operating performance quantities of the energy store.
25 Citations
19 Claims
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1. A device for ascertaining an amount of charge that is able to be drawn from an energy storage unit, up to at least one cutoff threshold, comprising:
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a charge predictor for calculating the amount of charge that is able to be drawn from the energy storage unit, up to the at least one cutoff threshold, wherein the calculated amount of charge is based on the product of a time value and a measured or a predetermined discharge current, and wherein the time value is based on an amount of time before the at least one cutoff threshold is met; and an estimator for ascertaining at least one state variable, based on at least one operating performance quantity of the energy storage unit, wherein the charge predictor includes a mathematical energy storage model that receives the at least one state variable as input and provides an estimate of a variable value as a function of time, and wherein the time value is an estimated point in time when the variable value meets or exceeds the at least one cutoff threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for ascertaining an amount of charge that is able to be drawn from an energy storage unit, up to at least one cutoff threshold, comprising:
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calculating, using a charge predictor, the amount of charge that is able to be drawn from the energy storage unit, wherein the calculated amount of charge is based on the product of a time value and a measured or a predetermined discharge current, and wherein the time value is based on an amount of time before the at least one cutoff threshold is met; ascertaining, using an estimator, at least one of state variables and parameters, based on at least one operating performance quantity of the energy storage unit, wherein the charge predictor includes a mathematical energy storage model that receives the at least one state variable as input and provides an estimate of a variable value for any given point in time, and wherein the time value is the given point in time when the variable value meets or exceeds the at least one cutoff threshold. - View Dependent Claims (10)
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11. A charge predicting device for an energy store, comprising:
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a charge predicting arrangement including; at least a first input to receive at least one of a state variable and a parameter from a state estimator, the state estimator configured to receive as input at least one of a recent operating voltage, temperature, and current of the energy store; at least a second input to receive at least one of a discharge current characteristic and a temperature characteristic; and a storing arrangement to store at least one energy store performance model; wherein the charge predicting arrangement is configured to determine a charge remaining in the energy store, wherein the charge remaining is determined as being drawn up to at least one predetermined cutoff criteria that indicates a cutoff that is prior to a full discharge of the energy store, wherein the at least one predetermined cutoff criteria is a threshold value for the at least one of a state variable and a parameter, and wherein the performance model is configured to estimate a time until the threshold value is met, and the charge remaining determination is based on this time estimate. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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Specification