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Nonlinear adaptive observation approach to battery state of charge estimation

A technology of electric vehicles and batteries, applied in electric vehicles, hybrid vehicles, motor vehicles, etc., can solve problems such as SOC deviation

Active Publication Date: 2013-01-02
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the nature of the method described, the calculated SOC may deviate from the actual SOC

Method used

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  • Nonlinear adaptive observation approach to battery state of charge estimation
  • Nonlinear adaptive observation approach to battery state of charge estimation
  • Nonlinear adaptive observation approach to battery state of charge estimation

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Embodiment Construction

[0023] As required, detailed embodiments of the invention are disclosed herein; however, it is to be understood that the disclosed embodiments are merely exemplary of the invention embodied in various and alternative forms. The figures are not necessarily to scale; some features may be exaggerated or minimized to show details of particular components. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a representative basis for teaching one skilled in the art to variously employ the present invention.

[0024] Figure 1 to Figure 6 An example embodiment of the invention is shown. All features described below may be varied in other embodiments of the invention depending on the application.

[0025] In an embodiment of the present invention, the state of charge estimation problem is considered for batteries satisfying the following characteristics: the charge and discharge efficiencies are known; the open...

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Abstract

A method of controlling an electric vehicle including an internal combustion engine, a battery having a state of charge (SOC) and an open circuit voltage (OCV), includes establishing a system for estimating battery SOC. The system includes (i) a parameter estimation subsystem including a recursive parameter estimator for identifying battery parameters and (ii) an OCV estimation subsystem including a nonlinear adaptive observer for estimating battery OCV. Estimated battery OCV is related to estimated battery SOC by a mapping. An output is generated based on the estimated battery SOC.

Description

technical field [0001] The present invention relates to a nonlinear adaptive observation method for battery state of charge (SOC) estimation. Background technique [0002] Hybrid vehicles can appear in different forms, use different energy storage devices, and meet different user needs. Existing hybrid vehicles include hybrid electric vehicles (HEVs) that use batteries as an energy storage system. A plug-in hybrid electric vehicle (PHEV) is an extension of existing hybrid electric vehicle (HEV) technology. Compared to a standard hybrid vehicle, a PHEV utilizes a larger capacity battery pack and adds the ability to recharge the battery from a standard outlet to reduce fuel consumption and further improve fuel economy in electric or hybrid drive modes. There are also battery electric vehicle (BEV) applications where the electric motor completely replaces the internal combustion engine. [0003] Battery state of charge (SOC) is defined as the percentage of available charge t...

Claims

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Application Information

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IPC IPC(8): B60W20/00B60W10/08B60W10/06B60W10/18B60W10/26B60W10/115G01R31/36
CPCY02T10/7044B60L2250/16B60L2260/44Y02T10/705B60W20/106B60W2510/244B60W10/26B60L2260/52G01R31/3651G01R31/362B60L11/1861Y02T10/7005B60W20/13B60L58/12G01R31/367G01R31/3835Y02T10/70
Inventor 李勇华理查德·迪克·安德森宋京
Owner FORD GLOBAL TECH LLC
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