Blow-by gas recirculation device

A blow-by gas recirculation device configured to recirculate blow-by gas from an interior of a crankcase of a forced-induction engine to an intake passage, wherein

• the forced-induction engine includes:
• a compressor disposed in the intake passage;
• an intercooler disposed in a portion of the intake passage downstream of the compressor;
• and
• a throttle valve disposed in a portion of the intake passage downstream of the intercooler,
• the blow-by gas recirculation device comprises:
• a first passage that connects a portion of the intake passage downstream of the throttle valve to the interior of the crankcase;
• a second passage that connects the portion of the intake passage downstream of the intercooler to the interior of the crankcase;
• a third passage that connects a portion of the intake passage upstream of the compressor to the interior of the crankcase;
• a first check valve configured to permit a flow of gas from the interior of the crankcase to the intake passage through the first passage and restrict a flow of gas from the intake passage to the interior of the crankcase through the first passage;
• and
• a second check valve configured to permit a flow of gas from the intake passage to the interior of the crankcase through the second passage and restrict a flow of gas from the interior of the crankcase to the intake passage through the second passage, and
• the second passage and the third passage are separate from each other.