Understanding Limits to the Mechanical Efficiency of Opposed Piston Engines

Paper #:
  • 2017-01-1026

Published:
  • 2017-03-28
Abstract:
A study of the crank and geartrain dynamics of a 2-stroke opposed piston diesel engine design uncovered a disconnect between the thermodynamic process and its conversion to mechanical work. The classic 2-stroke opposed piston design phases the intake piston to lag the exhaust piston in order to achieve favorable gas exchange, overcoming the disadvantage of piston-controlled ports. One result of this is that significantly more of the engine torque is delivered by the leading crank than from the trailing one. This paper will examine why this torque difference occurs, and show that it is not simply a proportioning of the available thermodynamic work, but a result of a fundamental mechanical loss mechanism that limits the achievable brake efficiency of this engine architecture. By providing an understanding of this loss mechanism, this analysis will provide a basis for developing effective design solutions to overcome it.
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