Internal-combustion engines – Charge forming device – With fuel pump
Reexamination Certificate
1999-12-21
2001-10-23
Yuen, Henry C. (Department: 3747)
Internal-combustion engines
Charge forming device
With fuel pump
C123S480000
Reexamination Certificate
active
06305358
ABSTRACT:
TECHNICAL FIELD
The present invention relates generally to a fuel injector connected to an engine, and more particularly, to a method and apparatus for determining an injection timing for a fuel injector connected to an engine.
BACKGROUND ART
The fuel quantity that is delivered to an internal combustion engine, and the timing for the delivery fuel, may be determined by a controller. The controller, i.e., a software program executing within the controller, will determine the time and amount of fuel to be delivered to each injector. The controller then sends the fuel command to the solenoid associated with the appropriate fuel injector and the fuel is delivered. In typical fuel systems, the start of injection for each injector is the same. However, due to variances between each fuel injector, the same start of injection command does not result in the injection beginning at the same time. In addition, the correlation between the start of injection and the desired crank angle position may not be the same for each injector. Therefore the placement of the injection event, or start of injection, at a prescribed crank angle position, such as top dead center, is inaccurate.
The present invention is directed to overcoming one or more of the problems set forth above.
DISCLOSURE OF THE INVENTION
In one aspect of the present invention, a method for controlling the injection timing for a fuel injector connected to a fuel system within an engine is disclosed. The method includes the steps of establishing a desired injection timing of the injector, determining an actual injection timing of the injector, and modifying an injection command delivery time in response to the desired injection timing and the actual injection timing.
In another aspect of the present invention an apparatus for controlling an injection timing for a fuel injector connected to an engine having a fuel system is disclosed. The apparatus includes a speed sensor for sensing a speed of the engine, a pressure sensor for sensing a pressure of the actuating fluid, and a controller adapted to determine an actual injection timing, compare the actual injection timing to a desired injection timing, and responsively modify a fuel injection command delivery time.
REFERENCES:
patent: 4476832 (1984-10-01), Fujimori et al.
patent: 4503830 (1985-03-01), Nakamura et al.
patent: 5188084 (1993-02-01), Sekiguchi
patent: 5357912 (1994-10-01), Barnes et al.
patent: 5359883 (1994-11-01), Baldwin et al.
patent: 5445129 (1995-08-01), Barnes
patent: 5634448 (1997-06-01), Shinogle et al.
Caterpillar Inc.
Gimie Mahmoud
McPherson III W. Bryan
Yuen Henry C.
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