Method for determining a control observer for the soc

A control technology and observer technology, which can be applied in the fields of instruments, measuring electricity, measuring devices, etc., and can solve the problems of difficulty in implementing battery management systems, consumption, and high computing costs.

Active Publication Date: 2015-10-28
AVL LIST GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, depending on the model structure of the application, this approach leads to high to very high computational costs, which makes implementation in battery management systems difficult or expensive

Method used

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  • Method for determining a control observer for the soc
  • Method for determining a control observer for the soc
  • Method for determining a control observer for the soc

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Embodiment Construction

[0016] In a first step of the method according to the invention, a simple output model of the battery or battery cell is determined. In the following, the terms battery and battery cell are considered equivalent within the meaning of the present invention. This is based on any known model of any battery cell. A known battery model is, for example, a model known by another battery, a linear battery model or a non-linear battery model. A simple linear battery model can be determined, for example, by applying a current pulse to the battery or battery cell and measuring the resulting voltage there. Also the application of known impedance spectra can be used to create simple battery models. From these data, a linear battery model, for example a simple current-voltage relationship, can then be determined by means of identification methods. Although such jumping attempts are only suitable for certain operating points of the battery or battery cell and only for specific current pul...

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Abstract

The invention relates to the creation of a control observer in a structured and at least partially automated manner for any battery type. According to the invention, first a non-linear model of the battery, in the form of a local model network comprising a number of local, linear, time-invariant, dynamic models, which are each valid in certain ranges of the input variables, is determined from the measurement data of a previously determined optimized test plan by means of a data-based modeling method. A local observer is then determined for each local model (LMi) of the model network determined in such a way. The control observer (13) for estimating the SoC then results form a linear combination of the local observers.

Description

technical field [0001] The invention relates to a method for determining a control technology observer for evaluating the SoC (State of Charge) of a battery. Background technique [0002] In battery management systems known per se, e.g. for batteries of electric or hybrid vehicles, the state of charge ( SoC). This is often done by means of a control technology SoC observer, which normally uses a non-linear battery model which models the non-linear battery behavior of the battery voltage as a function of the charging and discharging current. The SoC observer then estimates the actual state of charge of the battery based on this model and the battery voltage measured in the vehicle. This is known, for example, from document DE 10 2009 046 579 A1, which uses a simple equivalent electrical circuit as a model for a battery cell. [0003] A problem here is that a separate model is required for each battery type. Such models are however difficult to parameterize (e.g. electroch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
CPCG01R31/3624G01R31/3651G01R31/367G01R31/3842H01M10/48Y02E60/10G01R31/3828G01R31/392
Inventor C·哈默特纳S·亚库贝克A·苏尔扬诺维克
Owner AVL LIST GMBH
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