Blow-by gas refluxing device

摘要

A blow-by gas refluxing device is provided for an engine system including an engine and an intake air passage communicating with the engine for supplying intake air into the engine. The blow-by gas refluxing device includes a plurality of blow-by gas refluxing passages each having an inlet communicating with the engine and an outlet communicating with the intake air passage. The outlets of the blow-by gas passages communicate with the intake air passage at different positions along the length of the intake air passage and each of the blow-by gas passages has a backflow preventing device disposed therein, so that blow-by gas produced in the engine can flow into the intake air passage via at least one of the blow-by gas refluxing passages throughout the entire operational range of the engine.

主权项

1. A blow-by gas refluxing device provided for an engine system including an engine, an intake air passage, and a supercharger and a throttle valve each disposed in the intake air passage, the throttle valve being disposed on a downstream side of the supercharger in the intake air passage, the blow-by gas refluxing device comprising:
a blow-by gas refluxing passage configured to allow blow-by gas produced in the engine to flow into the intake air passage and to be refluxed into the engine; an intercooler disposed in the intake air passage at a position on a downstream side of the supercharger and on an upstream side of the throttle valve; an intake air bypass passage connecting between an upstream side of the supercharger and a downstream side of the intercooler in the intake air passage; wherein the blow-by gas refluxing passage comprises a first blow-by gas refluxing passage and a second blow-by gas refluxing passage; wherein the first blow-by gas refluxing passage has an inlet and an outlet, the inlet being connected to at least one of a cylinder block and a cylinder head cover of the engine and the outlet being connected to the intake air bypass passage; and wherein the second blow-by gas refluxing passage has an outlet connected to the intake air passage on the downstream side of the throttle valve; and a jet pump capable of producing a negative pressure in the intake air bypass passage; wherein the outlet of the first blow-by gas refluxing passage is connected to the intake air bypass passage via the jet pump.