Patent ID: 8433495
Filing Date: 2013-04-30
Classification: G01M

Abstract:
1. A method for determining a blow-by gas species concentration, the method comprising: calculating one-dimensional engine performance data with a one-dimensional engine performance model, wherein the one-dimensional engine performance data is based at least in part upon an engine operating condition; transforming, automatically with a processor executing a two-dimensional ring dynamics model, the one-dimensional engine performance data into piston ring motion data, wherein the two-dimensional ring dynamics model simulates geometrical changes to a piston-ring pack flow path; and determining the blow-by gas species concentration with a network model comprising the one-dimensional engine performance model and a two-dimensional ring pack model, wherein the two-dimensional ring pack model simulates species concentration change in the piston-ring pack flow path, and the blow-by gas species concentration is determined using the engine operating condition and the piston ring motion data.