Air intake system for internal combustion engine

Details Air intake system for internal combustion engine Air intake system for internal combustion engine

1997-11-12

1998-08-25

McMahon, Marguerite

Internal-combustion engines

Charge forming device

Crankcase vapor used with combustible mixture

F02M 2314

Patent

active

057973806

ABSTRACT:
An air intake system for an internal combustion engine which does not impair detection performance of a flow sensor without impairing intrinsic function thereof even when a distance between the flow sensor (4) and as inlet port (80) for a recirculating air is dimensioned short. The air intake system includes a recirculating air passage (8) for recirculating a blow-by gas (B) leaking into a crankcase (13) connected to an engine cylinder (1) to an intake air passage (2a). A positive crankcase ventilation system is provided which includes a communicating passage (18) for communicating interior of the crankcase (13) with that of a head cover assembly (14) of the cylinder (1), a recirculating passage (6) for introducing the blow-by gas (B) from the head cover assembly (14) into an intake air passage (2a) at a location downstream of a throttle valve (24), and a recirculating air passage (8) for introducing the recirculating air into the head cover assembly (14) from the intake air passage (2a) at a location intermediate between the flow sensor (4) and the throttle valve (24). The recirculating air passage (8) has a suction member (81) having one end portion disposed within the intake air passage (2a). The suction member (81) defines an air inlet passage having an inlet port (80) provided in the one end portion located at a downstream side relative to the center of the one end portion within the intake air passage (2a). Disturbance in the air stream occurring at the flow sensor is suppressed. Besides, protecting the flow sensor is protected against contamination even when the blow-by gas injected from the recirculating air passage (8).

REFERENCES:
patent: 3116727 (1964-01-01), Dietrich
patent: 4345573 (1982-08-01), Obata
patent: 4922882 (1990-05-01), Topfer

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