| 摘要 |
<p>A valve assembly (10; 110) 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 (20) connected upstream of the throttle and an outlet (22) connected downstream of the throttle. A pintle (30) controls the restriction that the valve assembly imposes on the idle air flow. The valve assembly is controlled by the engine computer (102) selectively energizing a solenoid (72) on the assembly. In one embodiment (10) the solenoid armature (62, 92) controls flow through another flow path (50) of the valve assembly that parallels the idle air flow path (24). A movable internal wall (36, 38) divides the valve assembly's body into two variable volume chambers (46, 48). One chamber (48) forms part of the idle air bypass (24) while the other (46) forms part of the parallel flow path (50). The one chamber is essentially at manifold vacuum while the other is regulated by a bleed valve (52) and two orifices (60, 70) in the parallel flow path. Positioning of the movable wall positions the pintle. In a second embodiment (110), one chamber (48) is communicated with the idle air flow path (24) by an orifice (138), and the other (46) is communicated with the idle air flow path (24) by constructing the pintle from a hollow tube (130) containing the two orifices (60, 70) and placing the bleed valve (52) external to the tube for direct action with one (60) of the orifices. When the solenoid is not energized, the pintle is positioned to allow full idle air flow.</p> |
