Patent ID: 7523748
Filing Date: 2009-04-28
Classification: F01M

Abstract:
1. A blow-by gas processing apparatus applicable to an internal combustion engine, wherein an intake passage extends from the engine, an intake air flows through the intake passage from an upstream side to a downstream side, whereby the intake air flows toward the engine, a supercharger and a throttle valve are arranged in the intake passage, the throttle valve is positioned in a downstream side of the supercharger, the supercharger pressure feeds the intake air flowing through the intake passage toward the engine, thereby supercharging the intake air to the engine, the throttle valve variably sets a passage cross-sectional area of the intake passage, and the intake passage has an upstream portion in an upstream side of the supercharger, an intermediate portion between the supercharger and the throttle valve, and a downstream portion in a downstream side of the throttle valve, the processing apparatus comprising: a first breather passage connecting an interior of the engine with the downstream portion, the first breather passage communicating with the interior of the engine in a first communicating portion, and the first breather passage having a one-way discharge valve allowing only a gas discharge from the interior of the engine to the intake passage; a second breather passage connecting the interior of the engine with the upstream portion, the second breather passage communicating with the interior of the engine in the first communicating portion, and the second breather passage having a second one-way discharge valve allowing only a gas discharge from the interior of the engine to the upstream portion; and an introduction passage connecting the upstream portion with the interior of the engine at a non-supercharging time, and the introduction passage connecting at least one of the intermediate portion and the downstream portion with the interior of the engine at a supercharging time.