Volumetric metering equipment

Details Volumetric metering equipment Volumetric metering equipment

1994-07-05

1996-09-10

Chilcot, Richard

Measuring and testing

Internal combustion engine or related engine system or...

Compression

73232, G01M 1500

Patent

active

055534902

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
The present invention relates to volumetric metering equipment, especially but not exclusively for use in metering the volume of fluid pumped through one or more injectors by a diesel-engine fuel injection pump.
2. Description of the Prior Art
In one previously proposed form of such equipment, fuel or test oil is directed from such a pump to a piston cylinder arrangement in such a manner that the displacement of the piston provides an indication of the amount of fluid delivered by the pump. When the piston reaches its extreme end of delivery, with maximum displacement, a drain valve is switched to enable fluid to be released from the piston and cylinder arrangement, and so enable the piston to return to its starting end of delivery, corresponding to zero displacement. However, before subsequent displacement of the piston, following closure of the drain valve, can be considered to reflect accurately the amount of fluid delivered by the pump, dynamic equilibrium must be attained. One of the parameters involved in such dynamic equilibrium is the pressure of the fluid delivered to the piston and cylinder arrangement. It is desirable that this should be sufficient to inhibit the formation of any voids in the fuel or test oil. Therefore, after a return of the piston to its starting end of delivery, a certain number of injections from the pump are disregarded in order to enable the system to build up the desired back pressure. This results in an undesirable loss of time in the course of a metering operation.


SUMMARY OF THE INVENTION

A first aspect of the present invention seeks to provide a remedy to this problem.
Accordingly, this aspect of the invention is directed to volumetric metering equipment comprising (a) a metering unit having a chamber-defining part and a movable part, within the chamber-defining part, which is moveable in a given direction to increase the size of the chamber defined by the chamber-defining part and in the opposite direction to decrease the size of the chamber, (b) input and output port means of the chamber-defining part, the port means being in communication with the chamber, (c) at least one input line connected to the port means, (d) an input fluid-flow valve included in the said at least one input line, (e) an outlet line connected to the said port means and (f) a drain fluid-flow valve included in the output line, the equipment being such as to require a predetermined minimum operating pressure of fluid within the chamber, in which end-approach signal means are connected to the metering unit and are so constructed as to provide an end-approach signal when the moveable part is a predetermined distance away from the physical end of the available travel in the said opposite direction, and in which drain valve control means are directly or indirectly connected to the end-approach signal means and the drain valve and are so constructed as to close the drain valve upon receipt of an end-approach signal from the end-approach signal means, whereby (i) the inertia of the moveable part creates an increase in pressure of fluid in the chamber, to a required minimum operating pressure, by the time the speed of movement of the moveable part in the said opposite direction falls to zero, and/or (ii) the return force applied to the moveable member to move it in the said opposite direction remains transmitted to fluid in the chamber when the speed of movement of the moveable part in that direction falls to zero.
The end-approach signal means may also be so constructed as to provide a preliminary end-approach signal before the end-approach signal referred to in the immediately preceeding paragraph, in which case input fluid-flow valve control means would be directly or indirectly connected to the end-approach signal means and the input fluid-flow valve and would be so constructed as to open the input fluid-flow valve upon receipt of a preliminary end-approach signal from the end-approach signal means, whereby the pressure of fluid in the cham

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patent: 5107700 (1992-04-01), Kuttner et al.
patent: 5138997 (1992-08-01), Fehlmann
patent: 5226311 (1993-07-01), Scourtes

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