Patent ID: 7712456

Claim:
A blow-by gas processing apparatus applicable to an internal combustion engine, wherein an intake passage extends from the engine, 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 downstream 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 gas an upstream portion positioned upstream of the supercharger, an intermediate portion positioned between the supercharger and the throttle vale, and a downstream portion positioned downstream 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 having a one-way 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 of intake passage, the second breather passage having a pump pressure feeding gas from the interior of the engine to the intake passage; and an introduction passage connecting at least one of the upstream portion and the intermediate portion with an interior of the engine, an electronic control unit that controls the gas pressure fed by the pump, wherein the amount of the gas pressure fed by the pump is changed on the basis of a pressure of the downstream portion.