Optimized single-stage power-split hydraulic hybrid city bus

Muhammad I. Ramdan, Kim A. Stelson

Research output: Contribution to conferencePaperpeer-review

2 Scopus citations


Power-split architecture is, in theory, an excellent drive train in city bus applications because it combines the advantages of series (control flexibility) and parallel (high-efficiency power transfer) architectures. However, the power split also increases the complexity of the drive train with more component choices and control degrees of freedom that, if not properly optimized, would result in significant power loss. The hydraulic hybrid drive train has the disadvantages of the low speed limit of the hydraulic pump/motor unit and the low energy density of the hydraulic accumulator. An extensive optimization study has been done to ensure the hydraulic hybrid city bus drive train runs at optimal conditions. This study analyzes all twelve basic power-split configurations before any component or control strategy optimization is done. One input coupled configuration is found suitable for use in a power-split hydraulic hybrid city bus.

Original languageEnglish (US)
StatePublished - 2013
EventASME/BATH 2013 Symposium on Fluid Power and Motion Control, FPMC 2013 - Sarasota, FL, United States
Duration: Oct 6 2013Oct 9 2013


OtherASME/BATH 2013 Symposium on Fluid Power and Motion Control, FPMC 2013
Country/TerritoryUnited States
CitySarasota, FL


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