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Optimization methods applied to hybrid vehicle designThe use of optimization methods as an effective design tool in the design of hybrid vehicle propulsion systems is demonstrated. Optimization techniques were used to select values for three design parameters (battery weight, heat engine power rating and power split between the two on-board energy sources) such that various measures of vehicle performance (acquisition cost, life cycle cost and petroleum consumption) were optimized. The apporach produced designs which were often significant improvements over hybrid designs already reported on in the literature. The principal conclusions are as follows. First, it was found that the strategy used to split the required power between the two on-board energy sources can have a significant effect on life cycle cost and petroleum consumption. Second, the optimization program should be constructed so that performance measures and design variables can be easily changed. Third, the vehicle simulation program has a significant effect on the computer run time of the overall optimization program; run time can be significantly reduced by proper design of the types of trips the vehicle takes in a one year period. Fourth, care must be taken in designing the cost and constraint expressions which are used in the optimization so that they are relatively smooth functions of the design variables. Fifth, proper handling of constraints on battery weight and heat engine rating, variables which must be large enough to meet power demands, is particularly important for the success of an optimization study. Finally, the principal conclusion is that optimization methods provide a practical tool for carrying out the design of a hybrid vehicle propulsion system.
Document ID
19840011117
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Donoghue, J. F. (Cleveland State Univ. OH, United States)
Burghart, J. H. (Cleveland State Univ. OH, United States)
Date Acquired
September 4, 2013
Publication Date
June 1, 1983
Subject Category
Urban Technology And Transportation
Report/Patent Number
NASA-CR-168292
NAS 1.26:168292
DOE/NASA/0084-1
Accession Number
84N19185
Funding Number(s)
CONTRACT_GRANT: DE-AI01-77CS-51044
CONTRACT_GRANT: NAG3-84
PROJECT: RTOP 778-36-06
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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