Patent ID: 6056214
Filing Date: 2000-05-02
Classification: F02M

Abstract:
An electromagnetic fuel injector for high vapor pressure fuels, said fuel injector comprising:a housing;a valve body partial disposed with the housing, the valve body including an exterior surface, a first end surface, a second end surface, a passage extending between the first end surface and the second end surface along a longitudinal axis;an armature slidably disposed in the passage of the valve body, the armature having a portion defining a lower chamber with the passage between the armature and the second end surface, and an upper chamber proximate the first end surface of the valve body and within the housing, the armature including at least one aperture exposed to the lower chamber that assists armature movement during a commanded armature movement;at least one port disposed within the valve body, the at least one port providing communication between the exterior surface of the valve body and the passage of the valve body, the at least one port being exposed to the lower chamber; andat least one passageway disposed in the valve body, the at least one passageway providing communication between the lower chamber and the first end surface, the at least one passage way also providing rapid equalization of pressure between the lower chamber and the upper chamber so that an uncommanded armature movement is avoided.