This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Improving the Overall Efficiency of a Pneumatic-Combustion Hybrid Engine by Adding an Intermediate Heated Tank
ISSN: 0148-7191, e-ISSN: 2688-3627
Published September 08, 2013 by SAE International in United States
Annotation ability available
Several works have previously shown that the concept of pneumatic-combustion hybrid engine is an interesting alternative to the Electric Hybrid Vehicle, by leading to equivalent fuel savings for a probable lower cost. However, these studies have shown that the thermal insulation of the tank is a problem. Indeed, due to its size and its location, the adiabaticity of the pneumatic tank cannot be guaranteed. During a regenerative braking (pneumatic pump mode) the hot and pressurized air that is send to the tank cools, pressure drops and density increases. When reusing the air in pneumatic motor mode, the mass necessary to fill the cylinder is greater than the one that would have been necessary if the air was not cool at its stay in the tank. This phenomenon is the major cause to the quite low regenerative efficiency that has been observed on a prototype engine. This paper proposes and evaluates a solution to this problem by using an intermediate air tank heated by the exhaust gases while the engine operates in the conventional combustion mode. The proposed concept is developed in detail and 0D thermal and thermodynamic modeling is proposed. The fuel savings, for the NEDC and WLTP driving cycles under several thermal initial states of the intermediate tank, are estimated by numerical simulations. Finally, the influence of the intermediate heated tank size is investigated.
CitationBrejaud, P., Charlet, A., and Higelin, P., "Improving the Overall Efficiency of a Pneumatic-Combustion Hybrid Engine by Adding an Intermediate Heated Tank," SAE Technical Paper 2013-24-0075, 2013, https://doi.org/10.4271/2013-24-0075.
- Schechter , M. New Cycles for Automobile Engines SAE Technical Paper 1999-01-0623 1999 10.4271/1999-01-0623
- Higelin , P. and Charlet , A. Thermodynamic Cycles for a New Hybrid Pneumatic-Combustion Engine Concept SAE Technical Paper 2001-24-0033 2001 10.4271/2001-24-0033
- Dönitz , C. , Vasile , I. , Onder , C. , and Guzzella , L. Realizing a Concept for High Efficiency and Excellent Driveability: The Downsized and Supercharged Hybrid Pneumatic Engine SAE Technical Paper 2009-01-1326 2009 10.4271/2009-01-1326
- Andersson , M. , Johansson , B. , and Hultqvist , A. An Air Hybrid for High Power Absorption and Discharge SAE Technical Paper 2005-01-2137 2005 10.4271/2005-01-2137
- Tai , C. , Tsao , T. , Levin , M. , Barta , G. et al. Using Camless Valvetrain for Air Hybrid Optimization SAE Technical Paper 2003-01-0038 2003 10.4271/2003-01-0038
- Trajkovic , S. , Tunestål , P. , and Johansson , B. Investigation of Different Valve Geometries and Vavle Timing Strategies and their Effect on Regenerative Efficiency for a Pneumatic Hybrid with Variable Valve Actuation SAE Int. J. Fuels Lubr. 1 1 1206 1223 2009 10.4271/2008-01-1715
- DONITZ C. , VASILE I. , ONDER C. , and GUZZELLA L. Modeling and optimizing two- and four-stroke hybrid pneumatic engines IMechE Part D - Journal of Automobile Engineering 223 2 255 280 2009
- IVANCO A. Evaluation of energy management strategies for a hybrid pneumatic engine PhD thesis Université d'Orléans 2009
- Trajkovic , S. , Tunestal , P. , and Johansson , B. Vehicle Driving Cycle Simulation of a Pneumatic Hybrid Bus Based on Experimental Engine Measurements SAE Technical Paper 2010-01-0825 2010 10.4271/2010-01-0825
- Elgowainy , A. , Burnham , A. , Wang , M. , Molburg , J. et al. Well-To-Wheels Energy Use and Greenhouse Gas Emissions of Plug-in Hybrid Electric Vehicles SAE Int. J. Fuels Lubr. 2 1 627 644 2009 10.4271/2009-01-1309
- TRAJKOVIC S. The Pneumatic Hybrid Vehicle. A new Concept For Fuel Consumption Reduction PhD thesis Lund University 2010
- BREJAUD P. Etude théorique et expérimentale d'un nouveau concept de moteur hybride thermique pneumatique PhD thesis Université d'Orléans 2011
- SCHECHTER Operating an air-hybrid vehicle with two-stages compression and expansion us patent us 7,543,668 bi 2009
- BREJAUD P. , CHARLET A. , CHAMAILLARD Y. , IVANCO A. , and HIGELIN P. Pneumatic-combustion hybrid engine: A study of the effect of the valve train sophistication on pneumatic modes Oil and Gas Science and Technology-Rev. IFP 10.2516/ogst/2009054 2009
- Brejaud , P. , Higelin , P. , Charlet , A. , Colin , G. et al. One Dimensional Modeling and Experimental Validation of Single Cylinder Pneumatic Combustion Hybrid Engine SAE Int. J. Engines 4 2 2326 2337 2011 10.4271/2011-24-0074
- Ivanco , A. , Charlet , A. , Chamaillard* , Y. , and Higelin , P. Energy Management Strategies for Hybrid-Pneumatic Engine Studied on an Markov Chain Type Generated Driving Cycle SAE Technical Paper 2009-01-0145 2009 10.4271/2009-01-0145
- DONITZ C. , VASILE I. , ONDER C. , and GUZZELA L. Dynamic programming for hybrid pneumatic vehicles Proceeding ACC'09 proceedings of the 2009 conference on American control conference 2009