Valve, for use with a fuel injector

Details Valve, for use with a fuel injector Valve, for use with a fuel injector

1999-10-15

2001-01-02

Kashnikow, Andres (Department: 3752)

Fluid sprinkling, spraying, and diffusing

Processes

C239S088000, C239S096000, C239S533200, C239S533900, C239S600000

Utility Patent

active

06168087

ABSTRACT:

This invention relates to a valve, and in particular to a three way valve suitable for use in controlling the operation of a fuel injector. It will be appreciated, however, that the valve may be suitable for use in other applications.
It is known to use a two way control valve in a fuel injector of the type used in a common rail type fuel system to control the fuel pressure within a control chamber, thereby controlling the timing of fuel injection. For example, the control chamber may communicate with a source of fuel under pressure through a restricted flow passage, the control valve controlling communication between the control chamber and a low pressure fuel reservoir. In such an arrangement, during injection of fuel, fuel may be able to flow at a restricted rate to the control chamber and from the control chamber to the low pressure reservoir. Clearly, the presence of such a fuel flow path results in the fuel system being inefficient.
The provision of such a flow path may be avoided by replacing the two way control valve with a three way valve arranged such that the control chamber communicates either with the source of fuel under pressure or with the low pressure reservoir. Direct communication between the source of fuel under pressure and the low pressure fuel reservoir is thus prevented or restricted to the periods during which the valve is being switched.
According to the present invention there is provided a valve comprising a valve member slidable within a bore formed in a valve housing, the valve member including a region of enlarged diameter which is engageable with a seating defined by part of the bore to control communication between a first port and a chamber, a second port communicating with the chamber, the valve member further being engageable with a seating defined by a seating member located within the chamber and obscuring a third port to control communication between the second port and the third port.
The seating member may be movable laterally within the chamber, or may be secured in position within the chamber by means of an adhesive material.
The valve member is preferably arranged to extend through an opening formed in the seating member, and to define a restriction to fluid flow between the second port and the third port when the valve member is spaced from the seating defined by the seating member. The restriction to fuel flow may be defined between the valve member and the seating member, or may be defined by a small diameter drilling formed in the valve member.
The valve member may be moveable under the control of an electromagnetic actuator operable against the action of a return spring. Alternatively, the valve member may be moveable under the control of a piezoelectric actuator.
The control valve may be used in controlling the operation of a fuel injector of the type including a supply passage or line arranged, in use, to communicate with a source of fuel under pressure, and a control chamber defined, in part, by a surface associated with the valve needle of the injector, the surface being orientated such that the application of fuel under pressure to the control chamber applies a force to the needle urging the needle towards an associated seating, the control valve being arranged such that the first port thereof communicates with the supply passage, the second port thereof communicates with the control chamber, the third port of the control valve communicating with a low pressure fuel reservoir.


REFERENCES:
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