Fluid sprinkling – spraying – and diffusing – Including valve means in flow line – Reciprocating
Reexamination Certificate
1999-09-14
2001-07-31
Scherbel, David A. (Department: 3752)
Fluid sprinkling, spraying, and diffusing
Including valve means in flow line
Reciprocating
C239S088000, C239S096000, C239S127000, C239S533900, C251S129100, C335S266000, C335S268000
Reexamination Certificate
active
06267306
ABSTRACT:
This invention relates to a fuel injector for use in the delivery of fuel under high pressure to a combustion space of an associated compression ignition engine. The invention relates, in particular, to a fuel injector of the type in which the timing of fuel delivery can be controlled independently of the injection pressure.
In a typical injector of this type, two valves are used, one of the valves controlling the injection pressure, the other valve controlling the timing of commencement and termination of injection. The valve used to control the timing of injection is typically arranged to control the fuel pressure within a control chamber defined, in part, by a surface associated with the injector needle. Termination of injection is achieved by causing the control chamber pressure to rise, forcing the needle into engagement with its seating against a relatively high injection pressure.
Termination of injection in this manner may give rise to unacceptably high levels of smoke and particulate emissions, and it is an object of the invention to provide an injector in which this disadvantage can be avoided.
According to the present invention there is provided a fuel injector comprising a needle slidable within a bore, a surface associated with the needle defining, in part, a control chamber which communicates, through a restriction, with a supply passage, an injection control valve controlling communication between the control chamber and a low pressure reservoir, and a drain valve controlling communication between the supply passage and the low pressure reservoir, wherein the injection control valve and the drain valve include respective armatures moveable under the influence of a common electromagnetic actuator.
The actuator may include separate windings which are energizable independently to cause movement of the armatures. Alternatively, the actuator may include a single winding, energization of the winding to different levels causing movement of the armatures.
In use, the injection control valve may be arranged to open upon de-energization or partial de-energization of the winding(s) to allow the control chamber pressure to fall, thus allowing injection to commence. Alternatively, the injection control valve may be arranged to regulate the control chamber pressure, opening when the control chamber pressure exceeds a predetermined level.
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Harcombe Anthony Thomas
Knight Andrew Roger
Phillips Ronald
Ganey Steven J.
Lucas Industries
Scherbel David A.
Wells, St. John, Roberts Gregory & Matkin P.S.
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