초록 ▼

A closed crankcase ventilation system for a turbocharger internal combustion engine which uses differential pressure between the turbo compressor inlet and the crankcase to force blow-by gases through a separation device. The zone of low pressure of the turbo compressor inlet is located at the inner

A closed crankcase ventilation system for a turbocharger internal combustion engine which uses differential pressure between the turbo compressor inlet and the crankcase to force blow-by gases through a separation device. The zone of low pressure of the turbo compressor inlet is located at the innermost diameter of the compressor inlet shroud. The difference between the pressure in the compressor inlet and the crankcase creates a vacuum which pulls gas from the crankcase into the ventilation system. The ventilation system includes a high restriction separator for removing oil from the blow-by gases. A control valve bypasses the separation device when insufficient pressure differential exists to drive the separator. Additionally, a system for ventilating crankcase gases from a crankcase of the engine includes a first flow passage communicating between the crankcase and a turbocharger of the engine, an high restriction separator positioned in the flow passage for separating air contaminant mixtures from crankcase gases, a first connection for connecting a first end of the flow passage to the crankcase, a second connection for connecting a second end of the flow passage to a predetermined point of the turbocharger, a second flow passage communicating between the first flow passage and an intake manifold of the engine, and a bypass flow passage for bypassing the separator. In this case, the crankcase gases are directed through the separator during heavy load, light load and idle operating conditions when sufficient vacuum exists to draw the crankcase gases through the coalescing filter and through the bypass flow passage when a sufficient vacuum is not present.

대표청구항 ▼

[ What is claimed is:] [1.] A crankcase ventilation system for a turbocharger internal combustion engine, said system comprising:a crankcase, and a compressor inlet covered by a shroud;a main flow line communicating between said crankcase and said compressor inlet shroud, said main flow line communi

[ What is claimed is:] [1.] A crankcase ventilation system for a turbocharger internal combustion engine, said system comprising:a crankcase, and a compressor inlet covered by a shroud;a main flow line communicating between said crankcase and said compressor inlet shroud, said main flow line communicating with the innermost diameter of said shroud covering said compressor inlet;a vacuum limiting means positioned in said main flow line for limiting the maximum vacuum in said crankcase;a bypass means in said main flow line for directing air flow through said system;an air contaminant mixtures separation means positioned in said main flow line for separating air contaminant mixtures, said separation means including at least one high restriction separator; anda secondary flow line communicating between said bypass means to a point of said main flow line downstream of said air contaminant mixture separation means.