System and method to prime an electronic returnless fuel system during an engine start
AssigneeFord Global Technologies, LLC
InventorScott DeRaad
Life of this patent
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Abstract
A method for priming a fuel injected internal combustion engine with a returnless fuel system having a check valve and initiating a fuel pump with a command signal. After said initiation, adjusting said command signal as a sensed fuel pressure varies to achieve a fuel pressure and holding said command signal for a hold period after achieving said fuel pressure.
Claims25
A method for priming a fuel injected internal combustion engine with a returnless fuel system having a check valve, the method comprising:
- initiating a fuel pump with a command signal;
- after said initiation, achieving a fuel pressure with a command signal at a first level;
- and
- before a first fuel injection event, increasing said command signal to a second level higher than said first level to reduce a decreasing of fuel pressure caused by commencement of said first fuel injection event.
A method for priming a fuel injected internal combustion engine with a returnless fuel system having a check valve, the method comprising:
- initiating a fuel pump with a command signal;
- after said initiation, adjusting said command signal as a sensed fuel pressure varies to achieve a fuel pressure;
- and
- holding said command signal for a hold period after achieving said fuel pressure.
A Method for priming a fuel injected internal combustion engine with a returnless fuel system, the method comprising:
- calculating a target fuel pressure based on operating conditions;
- initiating a fuel pump using an open-loop control;
- increasing fuel pressure to a target pressure using a closed-loop control;
- maintaining a command fuel pump output value at the targeted fuel pressure;
- anticipating a first fuel injection;
- and
- adjusting the command fuel pump output to a level necessary to satisfy flowing fuel injection requirements prior to fuel injection.
A method for priming a fuel injected internal combustion engine with a returnless fuel system, the method comprising:
- calculating a target fuel pressure based on operating conditions;
- initiating a fuel pump using an open-loop control;
- initiating a delay mechanism to provide a duration of time for fuel pressure to increase;
- increasing fuel pressure to a target pressure using a closed-loop control;
- maintaining a command fuel pump output value at the targeted fuel pressure;
- anticipating a first fuel injection;
- and
- adjusting the command fuel pump output to a level necessary to satisfy flowing fuel injection requirements prior to fuel injection.
A computer storage medium having instructions encoded therein for controlling a fueling system of a fuel injected internal combustion engine, the medium comprising:
- instructions for priming a returnless fuel system, comprising:
- instructions for initiating a fuel pump with a command signal;
- instructions for holding said command signal for a period;
- and
- instructions for adjusting said command signal as a sensed fuel pressure varies, after said period.
Dependencies are inferred from the claim text.