Internal-combustion engines – Charge forming device – Auxiliary air or gas used to inject fuel
Patent
1985-01-18
1985-12-03
Cox, Ronald B.
Internal-combustion engines
Charge forming device
Auxiliary air or gas used to inject fuel
123472, 123451, 123533, F02B 300
Patent
active
045560374
DESCRIPTION:
BRIEF SUMMARY
The invention relates to apparatus for the distribution of measured quantities of liquid fuel into the induction tracts of a multi-cylinder spark ignition internal combustion engine.
BACKGROUND ART
Many apparatus for injecting fuel to an internal combustion engine have been devised and most rely on the maintenance of a column of liquid at high pressure to prevent the vaporisation of fuel under hot operating conditions, up to the point of the discharge of the fuel via a suitable nozzle.
Both continuously flowing and interrupted timed injection principles of operation are utilised. In both cases high precision components with matched calibrated flow characteristics are utilized one for each cylinder to achieve equal fuel distribution to each cylinder of the internal combustion engine.
It has been proposed to use a system known as the throttle body injection in which a single injector is used to inject the fuel into a manifold through which it travels to the cylinders in the same way as does the charge of fuel from a conventional carburetter. While this arrangement involves only a single or in the case of a V8 engine to injectors its does not achieve the accuracy of fuel delivery of an arrangement in which fuel is delivered directly to the inlet port of each cylinder in turn.
DISCLOSURE OF THE INVENTION
The object of the present invention is to provide apparatus for distributing the fuel equally after the required quantity has been metered by any suitable single means, and delivering it directly to the inlet port of each cylinder in turn thereby reducing the need for the use of a multiplicity of high precision expensively calibrated components.
The present invention consists in apparatus for the uniform distribution of fuel to a multi-cylinder spark ignition engine comprising a fuel metering device arranged to deliver discrete metered quantities of fuel in accordance with the requirements of the cylinders of the engine, means defining a catchment chamber arranged to receive each such quantity, a plurality of passages extending from said chamber, one for each cylinder of the engine, each said passage being connected through a conduit to the induction passage of one cylinder, means for admitting gas under pressure to said passages to expel each quantity of fuel from the chamber and means for directing the flow of gas from said chamber along each of said passages in turn whereby a metered quantity of fuel is delivered to each cylinder in turn.
BRIEF DESCRIPTION OF DRAWINGS
In order that the invention may be better understood preferred forms thereof are hereinafter described by way of example with reference to the accompanying drawings in which:
FIG. 1 is a diagrammatic view of the essential parts of apparatus according to the invention as applied to a single cylinder of a multi-cylinder engine;
FIG. 2 is a cross-sectional elevation of the essential parts of a first form of the invention;
FIG. 3 is a section on line 3--3 of FIG. 2;
FIG. 4 is a view similar to that of FIG. 2 of a second embodiment of the invention;
FIG. 5 is a view similar to that of FIG. 2 of a third embodiment of the invention; and
FIG. 6 is a partial sectional view of a fourth embodiment of the invention.
FIG. 1 shows one cylinder 10 of a multi-cylinder engine having an inlet manifold 11. An injection nozzle 12 extends into the manifold 11 and this is connected by a conduit 13 to a passage 14 within the body 15 of apparatus according to the invention. As is explained in greater detail in connection with the embodiments described below there is a conduit 13, injection nozzle 12 and a passage 14 corresponding to each of the cylinders of the engine. These passages meet in a catchment chamber 16 which is arranged immediately below a fuel metering device 17. This is of conventional construction and is arranged to inject into the catchment chamber a series of discrete quantities of fuel which is measured out by the fuel metering device 17 in accordance with the instantaneous requirements of the engine in a well known manner.
A solenoid contr
REFERENCES:
patent: 2262181 (1941-11-01), Hover
patent: 3610213 (1971-10-01), Gianini
patent: 3665949 (1972-05-01), Rivard
patent: 3744465 (1973-07-01), Voss
patent: 3971351 (1976-07-01), McKee
patent: 4224904 (1980-09-01), Clerk
patent: 4462760 (1984-07-01), Sarich
Cox Ronald B.
Wisdom Shirley A.
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