Fluid handling – With indicator – register – recorder – alarm or inspection means – Position or extent of motion indicator
Patent
1995-05-24
1997-01-21
Nguyen, Hoang
Fluid handling
With indicator, register, recorder, alarm or inspection means
Position or extent of motion indicator
2395851, F01B 707, F01B 700
Patent
active
055952151
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates in general to fluid-flow control valves, but particularly to fuel injectors for internal combustion (i.c.) engines.
A fuel injector for an i.c. engine normally consists of a valve which, in use, allows fuel to be injected under pressure into a cylinder for combustion. The timing of fuel injection into a cylinder can be reasonably accurately controlled by mechanical means but normally, in the case of a multi-cylinder i.c. engine, the mechanical means does not allow for separate adjustment of fuel injection timing for any one of said cylinders.
Electronic management systems for i.c. engines are now known wherein fuel injection to each cylinder is electronically controlled according to predetermined sequences. Such systems can include sensing means for feeding back to the management system signals indicative of engine timing events which allows the system to separately adjust subsequent timing events for fuel injection into each cylinder according to pre-programmed processes.
Whilst such management systems have been shown to improve engine performance regarding fuel consumption and exhaust emissions, for example, the ability of the system to improve engine performance relates directly to the accuracy of the system's control of timing events which itself depends upon the accuracy of the information the system receives regarding actual timing of fuel injection into each cylinder.
SUMMARY OF THE INVENTION
An object of the present invention is to provide an improved fluid-flow control valve including means to allow timing of fluid-flow to be accurately measured.
According to a first aspect of the present invention there is provided a fluid-flow control valve comprising juxtaposed first and second electrically conductive, stationary body members, separated by an electrically active means having electrical resistance, and an electrically conductive valve actuation member movably mounted to and electrically contacting said second body member, wherein movement of the actuation member from a first position spaced from said first body member to a second position contacting said first body member completes a lower resistance electrical connection between said first and second body members than that already existing through said electrically active separation means.
Preferably, the body members each include electrical contact means for enabling connection thereof to an external electrical circuit.
Preferably also, the valve is closed when the valve actuation member is in its first position. and an electrically conductive valve actuation member movably mounted to and electrically contacting said second body member, said valve actuation member being movable from a first position spaced from said first body member to a second position contacting said first body member, wherein said separating means is electrically conductive but has electrical resistance such that movement of the actuation member from its first position to its second position completes a lower resistance electrical connection between said first and second body members than that already existing between said members through said separation means.
Preferably, the body members each include electrical contact means for enabling connection thereof to an external electrical circuit.
Preferably also, the valve is closed when the valve actuation member is in its first position.
Preferably further, the first body member includes means for normally biasing the valve actuation member in its first position wherein an electrical contact between the biasing means and the valve actuating member has electrical resistance greater than or equal to the electrical resistance of the electrically active separation means.
According to a second aspect of the present invention there is provided a fuel injector nozzle assembly comprising an electrically conductive injector body mounting an electrically conductive injector nozzle, said nozzle being separated from the body by an electrically active means having electrical r
REFERENCES:
patent: 4341241 (1982-07-01), Baker
patent: 4545530 (1985-10-01), Hofmann et al.
patent: 4653720 (1987-03-01), Knapp et al.
patent: 4964571 (1990-10-01), Taue et al.
patent: 5104046 (1992-04-01), Sakagami
patent: 5285969 (1994-02-01), Greiner et al.
Stamford John
Wallace Ian F.
Nguyen Hoang
Perkins Limited
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