Characterization of crankcase pressure variation during the engine cycle of an internal combustion engine

Paper #:
  • 2017-01-1088

Published:
  • 2017-03-28
Abstract:
Variations in crankcase pressure have been observed in I4 engines and an understanding of the causes, frequency and magnitude of these variations is helpful in the design and effective operation of various engine systems. This paper shows through measured vehicle data and an understanding and explanation of the physics related to engine operation the relationship between crankcase volume change throughout the engine cycle and crankcase pressure fluctuations. It can be demonstrated that for a known or proposed engine design, through knowledge of key engine design parameters of number of cylinders, firing frequency, engine displacement, crankcase volume and engine stroke the frequency and amplitude and frequency of the cyclic variation in crankcase pressure can be predicted and thus utilized in the design of other engine systems. In addition to the prediction of pressure fluctuations for I4 engines this paper discusses the variation of crankcase pressure of other engine architectures and discusses the observations made from I3, I4, V6 and V8 engine crankcase pressure measurements at various speeds to discuss the sources of discrepancies and additional noise factors in these observations that could be explored with further modelling.
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