Patent ID: 6722129
Filing Date: 2004-04-20
Classification: F01M,F02B,F02M,Y02T

Abstract:
A crank case ventilation system for an internal combustion engine, comprising an air inlet system for supplying the engine with air, an engine air charge pressure boosting system for boosting the pressure of said air supply, and a crank case evacuation system for drawing crank case gasses from a crank case and introducing said gasses into the air inlet system, wherein:a) the air charge boosting system has in series a first boost stage and a second boost stage, the first boost stage being upstream of the second boost stage; b) the crank case evacuation system includes a first conduit and a second conduit for introducing the crank case gasses into the air inlet system, the first conduit introducing said gasses upstream of the first boost stage, and the second conduit introducing said gasses downstream of the first boost stage and upstream of the second boost stage; and c) the crank case evacuation system includes flow control means for controlling the flow of crank case gasses in the first conduit and in the second conduit.