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Pirault, Jean-Pierre
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Scuderi Split Cycle Research Engine: Overview, Architecture and Operation

SAE International Journal of Engines

Southwest Research Institute-Ford Phillips, Ian Gilbert, Jean-Pierre Pirault, Marc Megel
  • Journal Article
  • 2011-01-0403
Published 2011-04-12 by SAE International in United States
The Scuderi engine is a split cycle design that divides the four strokes of a conventional combustion cycle over two paired cylinders, one intake/compression cylinder and one power/exhaust cylinder, connected by a crossover port. This configuration provides potential benefits to the combustion process, as well as presenting some challenges. It also creates the possibility for pneumatic hybridization of the engine. This paper reviews the first Scuderi split cycle research engine, giving an overview of its architecture and operation. It describes how the splitting of gas compression and combustion into two separate cylinders has been simulated and how the results were used to drive the engine architecture together with the design of the main engine systems for air handling, fuel injection, mixing and ignition. A prototype engine was designed, manufactured, and installed in a test cell. The engine was heavily instrumented and initial performance results are presented.
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Scuderi Split Cycle Fast Acting Valvetrain: Architecture and Development

SAE International Journal of Engines

Southwest Research Institute-Riccardo Meldolesi, George Bailey, Clive Lacy, Ian Gilbert, Jean-Pierre Pirault, Anthony Perkins
  • Journal Article
  • 2011-01-0404
Published 2011-04-12 by SAE International in United States
The Scuderi internal combustion engine is characterized by a split cycle that divides the four strokes of a conventional combustion cycle over two paired cylinders, one intake/compression cylinder and one power/exhaust cylinder, connected by a crossover port. This split cycle also has an additional high pressure “crossover” gas transfer phase versus the conventional 4-stroke cycle, during which the charge air is moved from the first to the second cylinder. The intake/compression, power/exhaust and crossover events are repeated every revolution, i.e. over two cycles, with a small phase angle between the two cylinders. The separate cylinders enable opportunities for improved combustion and the possibility for pneumatic hybridization of the engine. This paper describes the technical challenges posed by the actuation of the crossover valves in the Scuderi Split Cycle research engine. Fast actuation of these valves is a key requirement for successful combustion and for hybrid operation in the Scuderi and perhaps other pneumatic hybrid engines where the mass of air entering the cylinder is controlled by the operation of poppet valves. To successfully meet these…
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Opposed Piston Engines

Martin L.S. Flint
Powertrain Technology-Jean-Pierre Pirault
  • Book
  • R-378
Published 2009-10-08 by SAE International in United States
This book explores the opposed piston (OP) engine, a model of power and simplicity, and provides the first comprehensive description of most opposed piston (OP) engines from 1887 to 2006. Design and performance details of the major types of OP engines in stationary, ground, marine, and aviation applications are explored and their evolution traced. The OP engine has set enviable and leading-edge standards for power/weight refinement, fuel tolerance, fuel efficiency, package space, and manufacturing simplicity. For these reasons, the OP concept still remains of interest for outstanding power and package density, simplicity, and reliability; e.g., aviation and certain military transport requirements. Using material from historic and unpublished internal research reports, the authors present the rationale for OP engines, their diverse architecture, detailed design aspects, performance data, manufacturing details, and leading engineers and applications. Comparisons to four-stroke and competitor engines are made, supporting the case for reconsidering OP engines for certain applications. Topics include: The history of OP engines Aeronautical Automotive Military Marine Unusual OP engines Comparison between 2 and 4 stroke engines The future of…
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Performance Predictions for High Efficiency Stoichiometric Spark Ignited Engines

Southwest Research Institute-Jean-Pierre Pirault, Thomas W. Ryan, Terrence F. Alger, Charles E. Roberts
Published 2005-04-11 by SAE International in United States
Southwest Research Institute (SwRI) is exploring the feasibility of extending the performance and fuel efficiency of the spark ignition (SI) engine to match that of the emission constrained compression (CI) engine, whilst retaining the cost effective 3-way stoichiometric aftertreatment systems associated with traditional SI light duty engines. The engine concept, which has a relatively high compression ratio and uses heavy EGR, is called “HEDGE”, i.e. High Efficiency Durable Gasoline Engine. Whereas previous SwRI papers have been medium and heavy duty development focused, this paper uses results from simulations, with some test bed correlations, to predict multicylinder torque curves, brake thermal efficiency and NOx emissions as well as knock limit for light and medium duty applications. The parametric effects of high EGR dilution, variable valve timing, manifold and coolant temperatures are explored more readily than could be conducted with prototype test engines that are limited by EGR distribution, diesel swirl ports distribution and probably poor fuel preparation and wall wetting. Results are compared to state of art light duty CI engine performance. Conclusions are drawn as…
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