Patent ID: 8151775
Filing Date: 2012-04-10
Classification: F01M,F02M,Y02T

Abstract:
1. A combustion engine configured for positive crankcase ventilation including a crankcase headspace and an intake plenum, said crankcase headspace fluidly coupled to atmospheric pressure through a first conduit and fluidly coupled to the intake plenum through a second conduit, the improvement comprising: a valve within the first conduit effective to restrict the draw of fresh air therethrough into the crankcase headspace during engine operation sufficiently to establish a high vacuum condition by reducing the pressure within the crankcase headspace below atmospheric pressure, the reduced pressure within the crankcase headspace increasing the volatility of contaminants present within the crankcase headspace and exiting through the second conduit including a positive crankcase ventilation valve, wherein said valve within the first conduit is controllably variable in response to engine temperature.