Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1994-08-02
1995-08-22
Moulis, Thomas N.
Internal-combustion engines
Charge forming device
Fuel injection system
123506, F02M 4114, F02M 6302
Patent
active
054430496
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a fuel injection pumping apparatus for supplying fuel to a compression ignition engine and of the kind comprising a bore, a pumping plunger reciprocable within the bore, the plunger and bore defining a pumping chamber, an outlet passage communicating with the pumping chamber and through which during inward movement of the pumping plunger, fuel can be displaced to an associated engine, passage means through which fuel from a source of fuel under pressure can flow into the pumping chamber to completely fill the pumping chamber during outward movement of the pumping plunger and an electromagnetically operable spill valve including an actuating member, for spilling fuel from the pumping chamber during the inward movement of the pumping plunger thereby to control the quantity of fuel supplied to the associated engine.
One example of such an apparatus is seen in GB-A-2119030 and in the apparatus shown therein a high pressure pump comprising a pair of pumping plungers delivers fuel to a plurality of outlet ports in turn. A single spill valve is utilized to control the quantity of fuel delivered through the outlet ports to the combustion chambers of the aforesaid engine.
The spill valve includes a valve member which is spring loaded to the open position, the valve member being moved to the closed position when the solenoid of the associated actuator is supplied with electric current. The solenoid is energised during the inward movement of the pumping plungers and may be de-energised before the inward movement is completed, in order to control the amount of fuel delivered to the engine. If the spill valve for some reason remains closed, then all the fuel previously supplied to the pumping chamber will be delivered to the engine and as a result the engine will receive considerably more fuel than intended with the possibility of excess engine speed and other damage.
One way of overcoming this problem is to provide the apparatus with a fuel shut off valve which is normally closed and which is located intermediate the high pressure pump and a low pressure fuel supply pump which forms part of the apparatus. A further solenoid is provided which when energised, opens the valve and the supply of electric current to the solenoid can be controlled by the control system of the apparatus. The cost of providing the additional solenoid together with the additional connections to the control system can be substantial.
The object of the present invention is to provide an apparatus of the kind specified in a simple and convenient form.
According to the invention an apparatus of the kind specified comprises a flow inhibit valve incorporated into said passage means, said flow inhibit valve including a valve member movable to a closed position to prevent flow of fuel through said passage means and means movable by said actuating member for controlling the setting of the valve member.
An example of a fuel pumping apparatus in accordance with the invention will now be described with reference to the accompanying drawings in which:
FIG. 1 is a sectional side elevation of an apparatus to which the invention is applied,
FIGS. 2 and 3 are diagrammatic drawings of a flow inhibit valve which may be incorporated into the apparatus shown in FIG. 1, the two figures showing the valve in different settings, and
FIG. 4 is a view similar to FIG. 2 showing a modified form of the inhibit valve.
Referring to FIG. 1 of the drawings the pumping apparatus includes a housing 10 in which is mounted a rotary distributor member 11 which is driven in synchronism with the associated engine. A transverse bore 12 is formed in the distributor member and in the bore is mounted a pair of pumping plungers 13 which are movable inwardly by the action of cam lobes formed on the internal surface of a cam ring 14 mounted in the housing. The plungers and bore define the pumping chamber of a high pressure pump. The pumping chamber communicates by way of a longitudinal passage in the distributor member, with a delivery passage 15 also in the distrib
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Lucas Industries Public Limited Company
Moulis Thomas N.
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