Fuel control system

A cold start fuel control system for use with an internal combustion engine having a plurality of combustion chambers, a source of fuel, and a primary intake manifold having an air inlet and an outlet port connected to each combustion chamber, said system comprising:

• a cold start fuel injector assembly having an inlet and an outlet,
• said cold start fuel injector assembly being fluidly connected to the source of fuel,
• an auxiliary intake manifold having an internal chamber,
• said cold start fuel injector assembly outlet being fluidly connected to said auxiliary intake manifold chamber,
• said auxiliary intake manifold chamber being fluidly connected through a control orifice to each of the combustion chambers at a position downstream from the inlet of the primary intake manifold means to vary the cross-sectional area of said control orifice;
• and
• a control circuit response to at least one input signal, said control circuit having an output signal and means responsive to said output signal for varying the cross-sectional area of said control orifice.

A cold start fuel control system for use with an internal combustion engine having a plurality of combustion chambers, a source of fuel, and a primary intake manifold having an air inlet and an outlet port connected to each combustion chamber, said system comprising:

• a cold start fuel injector assembly having an inlet and an outlet,
• said cold start fuel injector assembly being fluidly connected to the source of fuel,
• an auxiliary intake manifold having an internal chamber,
• said cold start fuel injector assembly outlet being fluidly connected to said auxiliary intake manifold chamber,
• said auxiliary intake manifold chamber being fluidly connected through a control orifice to each of the combustion chambers at a position downstream from the inlet of the primary intake manifold;
• and
• a shroud positioned in the primary intake manifold in alignment with at least one control orifice, said shroud having a side open to its associated combustion chamber.

A cold start fuel control system for use with an internal combustion engine having a plurality of combustion chambers, a source of fuel, and a primary intake manifold having an air inlet and an outlet port connected to each combustion chamber, said system comprising:

• a cold start fuel injector assembly having an inlet and an outlet,
• said cold start fuel injector assembly being fluidly connected to the source of fuel,
• an auxiliary intake manifold having an internal chamber,
• said cold start fuel injector assembly outlet being fluidly connected to said auxiliary intake manifold chamber,
• said auxiliary intake manifold chamber being fluidly connected through a control orifice to each of the combustion chambers at a position downstream from the inlet of the primary intake manifold;
• wherein each control orifice comprises a body having a through opening, said body being mounted within a seat in said auxiliary intake manifold;
• and
• wherein each body throughbore has an outwardly flared axial end.

For use in combination with an internal combustion engine having an engine block, a plurality of combustion chambers, intake air passages formed in the engine block so that one intake air passage is fluidly associated with and connected to each combustion chamber, a source of fuel, and a primary intake manifold having an air inlet and a plurality of outlet ports with at least one port associated with each combustion chamber, said system comprising:

• a cold start fuel injector assembly having an inlet and an outlet,
• said cold start fuel injector assembly inlet being fluidly connected to the source of fuel,
• an auxiliary intake manifold having an internal chamber, said auxiliary intake manifold having a manifold housing portion interposed between the primary intake manifold and the engine block, said manifold housing portion defining a fuel passageway fluidly connecting each air intake passage with its associated port(s) in the primary air intake manifold,
• a plurality of control orifices, at least one control orifice being open to each fuel passageway in the manifold housing portion,
• said cold start fuel injector assembly outlet being fluidly connected to said auxiliary intake manifold chamber,
• said auxiliary intake manifold chamber being fluidly connected to each control orifice;
• comprising means to vary the cross-sectional area of said control orifices;
• and
• wherein said varying means comprises electromechanical varying means.

A cold start fuel control system for use with an internal combustion engine having a plurality of combustion chambers, a source of fuel, and a primary intake manifold having an air inlet and an outlet port connected to each combustion chamber, said system comprising:

• a cold start fuel injector assembly having an inlet and an outlet,
• said cold start fuel injector assembly being fluidly connected to the source of fuel,
• an auxiliary intake manifold having an internal chamber,
• said cold start fuel injector assembly outlet being fluidly connected to said auxiliary intake manifold chamber,
• a control orifice member associated with each of the combustion chambers, each control orifice member being positioned downstream from the inlet of the primary intake manifold and adjacent its associated combustion chamber,
• a plurality of fuel feed tubes, one fuel feed tube extending between said auxiliary intake manifold chamber and each control orifice member.