Idle air bypass

Details Idle air bypass Idle air bypass

1990-01-10

1991-02-05

Nelli, Raymond A.

Internal-combustion engines

Engine speed regulator

Idle speed control

251 3003, F02M 300

Patent

active

049895648

ABSTRACT:
A valve assembly of novel configuration is associated with the main air induction passage of a fuel-injected, spark-ignited, automotive internal combustion engine for the purpose of regulating the idle air flow. The valve assembly has an inlet connected upstream of the throttle. A pintle controls the restriction that the valve assembly imposes on the idle air flow. The valve assembly is controlled by the engine computer selectively energizing a solenoid on the assembly. The solenoid armature controls flow through another flow path of the valve assembly that parallels the idle air flow path. A movable internal wall divides the valve assembly's body into two variable volume chambers. One chamber forms part of the idle air bypass while the other forms part of the parallel flow path. The one chamber is essentially at manifold vacuum while the other is regulated by a bleed valve and two orifices in the parallel flow path. Positioning of the movable wall positions the pintle.

REFERENCES:
patent: 4738237 (1988-04-01), Brandner et al.
patent: 4750461 (1988-06-01), Hasebe et al.
patent: 4823750 (1989-04-01), Niida et al.
patent: 4829960 (1989-05-01), Yuzawa et al.
patent: 4870944 (1989-10-01), Matsumoto et al.
patent: 4873955 (1989-10-01), McAuliffe, Jr.
patent: 4913111 (1990-04-01), Kalippke et al.

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