Ventilation control apparatus for internal combustion engine

摘要

A ventilation control apparatus for a supercharged internal combustion engine that can perform crankcase ventilation favorably. A system includes a supercharging system, an EGR mechanism, and a blow-by gas reflux mechanism. The EGR mechanism includes an ejector between an EGR valve and an EGR cooler. A suction port is connected to a cylinder head cover via a PCV passage. A nozzle portion is connected to an EGR passage on the EGR cooler side. A diffuser portion is connected to the EGR passage on the EGR valve side. By making EGR gas flow through the EGR passage, gas in the crankcase can be drawn through the PCV passage to thereby be burned, together with the EGR gas or fresh air, in an engine.

主权项

1. A ventilation control apparatus for an internal combustion engine, comprising:
a supercharger including a compressor disposed at an intake passage of an internal combustion engine and an exhaust turbine disposed at an exhaust passage of the internal combustion engine; a first bypass passage connecting a portion of the exhaust passage upstream of the exhaust turbine and a portion of the intake passage downstream of the compressor; a first PCV passage connecting, at a midway point in the first bypass passage, a cylinder head of the internal combustion engine and the first bypass passage; and first gas introducing means disposed at a connection point between the first bypass passage and the first PCV passage, the first gas introducing means for introducing blow-by gas flowing through the first PCV passage to the first bypass passage using a differential pressure between internal pressure in the exhaust passage upstream of the exhaust turbine and internal pressure in the intake passage downstream of the compressor.