Method and apparatus for dynamic trimming of fuel system
AssigneeCaterpillar Inc.
InventorMichael S. Lukich
Life of this patent
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Abstract
With reference to the drawings and in operation, the present invention is adapted to provide a method and apparatus for dynamically controlling the injection timing of a fuel injector connected to a fuel system located within an engine. The method includes the steps of establishing a desired injection timing of the injector 104 and determining an fuel injection command delivery time in response to the desired injection timing, and responsively delivering the fuel injection command. The actual injection timing is determined, and then the injection command delivery time is modified in response to comparing the actual and the desired injection timing. Comparing the actual and desired injection timing provides for closed loop control of the injection timing of the fuel system 102.
Claims14
A method configured to control the injection timing of a fuel injector connected to a fuel system within an engine, said fuel system having an actuating fluid, comprising the steps of:
- establishing a desired injection timing of the injector;
- determining a fuel injection command delivery time in response to said desired injection timing, and responsively delivering said injection command;
- determining a pressure of said actuating fluid;
- determining a piston position of a piston associated with the fuel injector, said piston being located within the engine;
- determining an actual injection timing in response to said pressure and said piston position;
- and
- determining a subsequent fuel injection command delivery time in response to said actual injection timing.
A method configured to control the injection timing of a fuel injector connected to a fuel system within an engine, said fuel system having an actuating fluid, comprising the steps of:
- establishing a desired injection timing of the injector;
- determining a fuel injection command delivery time in response to said desired injection timing, and responsively delivering said injection command;
- determining a rail pressure of said actuating fluid;
- determining a crank angle position of an engine crank;
- determining an actual injection timing in response to said rail pressure and said crank angle position;
- and
- determining a subsequent fuel injection command delivery time in response to said actual injection timing.
An apparatus for controlling an injection timing for a fuel injector connected to an engine having a fuel system, said fuel system having actuating fluid, comprising:
- an speed sensor for sensing a speed of the engine and responsively generating a speed signal;
- a pressure sensor for sensing a pressure of said actuating fluid and responsively generating a pressure signal;
- and
- a controller adapted to receive said speed signal and said pressure signal and responsively determine an actual injection timing, compare said actual injection timing to a desired injection timing, and responsively modify a fuel injection command delivery time.
Dependencies are inferred from the claim text.