CRANKCASE VENTILATION FOR TURBOCHARGED ENGINE

摘要

An internal combustion engine for an automotive vehicle has an intake manifold receiving fresh air via an inlet duct. The engine includes a crankcase. A turbocharger is provided having a compressor with an inlet coupled to the inlet duct and an outlet coupled to the intake manifold. A first vent line couples the crankcase with the compressor inlet. A second vent line couples the crankcase with the compressor outlet and intake manifold. The second vent line has a valve blocking air flow into the crankcase and allowing air flow out from the crankcase. The first vent line comprises a dual-acting valve having a first flow capacity into the crankcase and a second flow capacity out from the crankcase which is greater than the first flow capacity. Thus, crankcase ventilation is optimized for both engine idle and high engine load conditions.

主权项

1. A vehicle comprising:
an internal combustion engine with an intake manifold receiving fresh air via an inlet duct, wherein the engine includes a crankcase; a turbocharger having a compressor with an inlet coupled to the inlet duct and an outlet coupled to the intake manifold; a first vent line coupling the crankcase with the compressor inlet; and a second vent line coupling the crankcase with the compressor outlet and intake manifold, the second vent line having a valve blocking air flow into the crankcase and allowing air flow out from the crankcase; wherein the first vent line comprises a dual-acting valve having a first flow capacity into the crankcase and a second flow capacity out from the crankcase which is greater than the first flow capacity.