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US 7,007,667 B2Granted
Cold start fuel control system
AssigneeHitachi, Ltd.
InventorsJonathan Borg, Shigeru Oho, Frank Warren Hunt, Ayumu Miyajima
Life of this patent
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AssigneeHitachi, Ltd.
InventorsJonathan Borg, Shigeru Oho, Frank Warren Hunt, Ayumu Miyajima
Estimating the term…
An engine startup fuel control system for use with an internal combustion engine of the type having a plurality of combustion chambers, an air intake passage fluidly connected to each combustion chamber and a source of fuel. The system includes a multipoint fuel injector associated with each combustion chamber in which the multipoint fuel injector has an inlet connected to the fuel source and an outlet fluidly connected to the intake air passageway adjacent its associated combustion chamber. A cold start fuel injector also has an inlet connected to the fuel source and an outlet connected through a cold start passageway with each combustion chamber. A processing circuit selectively activates the multipoint fuel injectors as well as the cold start fuel injector. The processing circuit determines the air/fuel mixture introduced by the cold start fuel injector into each combustion chamber during engine startup and then selectively activates the multipoint fuel injectors to achieve a predetermined air/fuel mixture in each combustion chamber during engine startup. The processing circuit also variably retards the ignition of the combustion charge within at least one of the combustion chambers to achieve faster heating of a catalytic converter. Furthermore, the cold start fuel injector is optionally activated in a plurality of spaced subpulses for each combustion charge provided to each combustion chamber.
An engine startup fuel control system for use with an internal combustion engine of the type having a plurality of combustion chambers, an intake air passage fluidly connected each combustion chamber and a source of fuel, said fuel control system comprising:
An engine startup fuel control system for use with an internal combustion engine of the type having a plurality of combustion chambers, an intake air passage fluidly connected each combustion chamber, a cold start fuel passageway having an inlet and an outlet, the cold start fuel passageway outlet being fluidly connected to the combustion chambers and a source of fuel, said fuel control system comprising:
A method for managing fuel delivery in an internal combustion engine having multiple combustion chambers during engine startup, said engine having a main shaft and a multipoint fuel injection associated with each combustion chamber and a cold start fuel injector which, upon activation, provides a fuel charge to at least a plurality of combustion chambers through a cold start fuel passageway, said method comprising the steps of:
An engine startup fuel control system for use with an internal combustion engine of the type having a plurality of combustion chambers, an intake air passage fluidly connected each combustion chamber, a spark igniter associated with each combustion chamber and a source of fuel, said fuel control system comprising:
An engine startup fuel control system for use with an internal combustion engine of the type having a plurality of combustion chambers, an intake air passage fluidly connected each combustion chamber, a cold start fuel passageway having an inlet and an outlet, the cold start fuel passageway outlet being fluidly connected to the combustion chambers and a source of fuel, said fuel control system comprising:
Dependencies are inferred from the claim text.