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State of Charge Observer for Hybrid Vehicles

Fälth, Björn (1994) In MSc Theses
Department of Automatic Control
Abstract
As a part of a research project, AB Volvo Technological Development is investigating the properties of traction batteries of different types. The aim is to find a suitable energy storage for electric/hybrid vehicles. <br><br> This master thesis examines the possibility of using a non-linear model of a traction battery to construct a device that accurately estimates the battery State of Charge (SoC) under typical hybrid operating conditions, i.e. the battery is rarely fully charged or discharged. <br><br> The work has consisted of three major parts. First, the battery model was fitted to measurement data from a specific NiCd battery cell. This model was then used to design a state derivative feedback observer which is implemented in a micro... (More)
As a part of a research project, AB Volvo Technological Development is investigating the properties of traction batteries of different types. The aim is to find a suitable energy storage for electric/hybrid vehicles. <br><br> This master thesis examines the possibility of using a non-linear model of a traction battery to construct a device that accurately estimates the battery State of Charge (SoC) under typical hybrid operating conditions, i.e. the battery is rarely fully charged or discharged. <br><br> The work has consisted of three major parts. First, the battery model was fitted to measurement data from a specific NiCd battery cell. This model was then used to design a state derivative feedback observer which is implemented in a micro controller. <br><br> Certain precautions were taken when generating the source code, to that large parts of the code can be reused with other battery management applications. <br><br> The laboratory tests give good results compared to simpler methods, especially in the case of complicated discharge patterns or if the battery has aged and lost capacity. The observer method can, however, be further refined with the use of more complex models. (Less)
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author
Fälth, Björn
supervisor
organization
year
type
H3 - Professional qualifications (4 Years - )
subject
publication/series
MSc Theses
report number
TFRT-5499
ISSN
0280-5316
language
English
id
8848890
date added to LUP
2016-03-25 12:12:23
date last changed
2016-03-25 12:12:23
@misc{8848890,
  abstract     = {As a part of a research project, AB Volvo Technological Development is investigating the properties of traction batteries of different types. The aim is to find a suitable energy storage for electric/hybrid vehicles. <br><br> This master thesis examines the possibility of using a non-linear model of a traction battery to construct a device that accurately estimates the battery State of Charge (SoC) under typical hybrid operating conditions, i.e. the battery is rarely fully charged or discharged. <br><br> The work has consisted of three major parts. First, the battery model was fitted to measurement data from a specific NiCd battery cell. This model was then used to design a state derivative feedback observer which is implemented in a micro controller. <br><br> Certain precautions were taken when generating the source code, to that large parts of the code can be reused with other battery management applications. <br><br> The laboratory tests give good results compared to simpler methods, especially in the case of complicated discharge patterns or if the battery has aged and lost capacity. The observer method can, however, be further refined with the use of more complex models.},
  author       = {Fälth, Björn},
  issn         = {0280-5316},
  language     = {eng},
  note         = {Student Paper},
  series       = {MSc Theses},
  title        = {State of Charge Observer for Hybrid Vehicles},
  year         = {1994},
}