A Simulation Study Quantifying the Effects of Drive Cycle Characteristics on the Performance of a Pneumatic Hybrid Bus

Research output: Chapter in Book/Report/Conference proceedingPaper in conference proceeding


In the study presented in this paper, the effect of different vehicle driving cycles on the pneumatic hybrid has been investigated. The pneumatic hybrid powertrain has been modeled in UT-Power and validated against experimental data. The GT-Power engine model has been linked with a MATLAB/simulink vehicle model. The engine in question is a single-cylinder Scania D12 diesel engine, which has been converted to work as a pneumatic hybrid. The base engine model, provided by Scania, is made in UT-power and it is based on the same engine configuration as the one used in real engine testing. Earlier studies have shown a great reduction in fuel consumption with the pneumatic hybrid compared to conventional vehicles of today. However, most of these studies have been completely of theoretical nature. In this paper, the engine model is based on and verified against experimental data, and therefore more realistic results can be expected. The intent with the vehicle driving cycle simulation is to investigate the potential of a pneumatic hybrid bus regarding reduction in fuel consumption (FC) compared to a traditional internal combustion engine (ICE) powered bus. The results show that the improvement in fuel economy due to pneumatic hybridization varies heavily with choice of drive cycle. The New York bus drive cycle shows a reduction of up to 58 % for the pneumatic hybrid while the FLUE drive cycle only shows a reduction of 8%. What all cycles have in common is that the main part of the fuel consumption reduction comes from the start/stop-functionality, while regenerative braking only account for a modest part of up to about 12% of the fuel consumption. The results also show that the optimal pressure tank volume varies with drive cycles, ranging from 60 to over 500 liters.


Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Other Mechanical Engineering
Original languageEnglish
Title of host publicationProceedings of the ASME Internal Combustion Engine Division Fall Technical Conference
PublisherAmerican Society Of Mechanical Engineers (ASME)
ISBN (Print)978-0-7918-4944-6
Publication statusPublished - 2010
Publication categoryResearch
EventFall Technical Conference of the ASME Internal Combustion Engine Division, 2010 - San Antonio, TX, San Antonio, TX, United States
Duration: 2010 Sep 122010 Sep 15


ConferenceFall Technical Conference of the ASME Internal Combustion Engine Division, 2010
CountryUnited States
CitySan Antonio, TX

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