Fuel injection control during start-up
AssigneeFord Global Technologies, LLC
InventorsDavid Karl Bidner, John M. Roth, Mark Peters
Life of this patent
Estimating the term…
Abstract
A method of operation of an internal combustion engine including an intake valve coupled to a combustion chamber, and a port fuel injector positioned upstream of the intake valve in an intake manifold including a throttle, the port fuel injector fluidly coupled to a fuel rail included in a fuel delivery system housing a fuel at least partially composed of alcohol. The method including, during a start-up operation when the temperature of the engine is below a threshold value and fuel is actively being injected into the intake manifold, adjusting a cone angle of a fuel spray from the port fuel injector, via adjustment of the throttle and/or fuel delivery system, based on the position of the intake valve.
Claims20
A method of operation of an internal combustion engine including an intake valve coupled to a combustion chamber, and a port fuel injector positioned upstream of the intake valve in an intake manifold including a throttle, the port fuel injector fluidly coupled to a fuel rail included in a fuel delivery system housing a fuel at least partially composed of alcohol, the method comprising:
- during a start-up operation when the temperature of the engine is below a threshold value and fuel is actively being injected into the intake manifold, adjusting a cone angle of a fuel spray from the port fuel injector, via adjustment of the throttle and/or fuel delivery system, based on the position of the intake valve.
A method of operation of an internal combustion engine including an intake valve coupled to a combustion chamber, and a port fuel injector positioned upstream of the intake valve in an intake manifold including a throttle, the port fuel injector fluidly coupled to a fuel rail included in a fuel delivery system housing a fuel at least partially composed of alcohol, the method comprising:
- during a start-up operation when the engine temperature is below a threshold value and before manifold pressure has been pumped down below a pressure threshold, during a fuel injection event when fuel is actively being injected into the intake manifold, and during intake to exhaust valve overlap conditions, decreasing a cone angle of a fuel spray from the fuel injector via adjustment of the throttle and/or the fuel delivery system, where an amount of decrease is based on an alcohol content of the fuel.
A system for an internal combustion engine comprising:
- a combustion chamber including an intake valve fluidly coupled to an intake manifold and an exhaust valve fluidly coupled to an exhaust passage;
- a fuel delivery system including a fuel rail coupled to one or more port fuel injectors, the port fuel injector(s) positioned upstream of the intake valve in the intake manifold, and a fuel tank fluidly coupled to the fuel rail, the fuel tank housing a fuel at least partially composed out of alcohol;
- a throttle positioned upstream of the fuel injector within the intake manifold;
- a control system having computer readable storage medium, the medium comprising code for, during start-up operation when the engine temperature is a below a threshold value and fuel is actively being injected into the intake manifold, decreasing a cone angle of a fuel spray from the port fuel injector via adjustment of a manifold air pressure and/or a fuel rail pressure during open valve fuel injection, where an amount of adjustment to the cone angle is based on an amount of alcohol in the fuel.
Dependencies are inferred from the claim text.