Direct method for optimal power management in hybrid electric vehicles

Dosthosseini, R., Kouzani, A. Z. and Sheikholeslam, F. 2011, Direct method for optimal power management in hybrid electric vehicles, International journal of automotive technology, vol. 12, no. 6, pp. 943-950.

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Title Direct method for optimal power management in hybrid electric vehicles
Author(s) Dosthosseini, R.
Kouzani, A. Z.ORCID iD for Kouzani, A. Z.
Sheikholeslam, F.
Journal name International journal of automotive technology
Volume number 12
Issue number 6
Start page 943
End page 950
Total pages 8
Publisher Springer
Place of publication Amsterdam, Netherlands
Publication date 2011
ISSN 1229-9138
Keyword(s) Direct method
Hybrid electric vehicles
Inequality constraints
Optimal control
Orthogonal function
Summary Hybrid electric vehicles are powered by an electric system and an internal combustion engine. The components of a hybrid electric vehicle need to be coordinated in an optimal manner to deliver the desired performance. This paper presents an approach based on direct method for optimal power management in hybrid electric vehicles with inequality constraints. The approach consists of reducing the optimal control problem to a set of algebraic equations by approximating the state variable which is the energy of electric storage, and the control variable which is the power of fuel consumption. This approximation uses orthogonal functions with unknown coefficients. In addition, the inequality constraints are converted to equal constraints. The advantage of the developed method is that its computational complexity is less than that of dynamic and non-linear programming approaches. Also, to use dynamic or non-linear programming, the problem should be discretized resulting in the loss of optimization accuracy. The propsed method, on the other hand, does not require the discretization of the problem producing more accurate results. An example is solved to demonstrate the accuracy of the proposed approach. The results of Haar wavelets, and Chebyshev and Legendre polynomials are presented and discussed. © 2011 The Korean Society of Automotive Engineers and Springer-Verlag Berlin Heidelberg.
Language eng
Field of Research 090201 Automotive Combustion and Fuel Engineering (incl Alternative/Renewable Fuels)
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2011, Springer
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