Feedback fuel metering control system
First Claim
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1. A feedback fuel metering control system for an internal combustion engine having air intake means supplying combustion air to said engine, and fuel supply means including a fuel pump supplying fuel to said engine, comprising:
- means sensing the amount of combustion air supplied to said engine;
means sensing the flow velocity of fuel supplied to said engine comprising means between said fuel supply means and said engine and producing a fuel pressure drop indicating fuel flow velocity;
means between said fuel supply means and said engine and responsive to said means sensing said amount of of combustion air and said means sensing said flow velocity of fuel and controlling fuel flow without a carburetor, to control the amount of fuel supplied to said engine according to said combustion air and said fuel flow velocity.
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Abstract
A feedback fuel metering control system is provided for an internal combustion engine and eliminates the need for high pressure fuel injectors, a high pressure fuel pump and a constant fuel pressure regulator. The system senses the amount of combustion air supplied to the engine, senses fuel flow velocity, and controls the amount of fuel supplied according to the amount of combustion air the fuel flow velocity.
59 Citations
25 Claims
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1. A feedback fuel metering control system for an internal combustion engine having air intake means supplying combustion air to said engine, and fuel supply means including a fuel pump supplying fuel to said engine, comprising:
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means sensing the amount of combustion air supplied to said engine; means sensing the flow velocity of fuel supplied to said engine comprising means between said fuel supply means and said engine and producing a fuel pressure drop indicating fuel flow velocity; means between said fuel supply means and said engine and responsive to said means sensing said amount of of combustion air and said means sensing said flow velocity of fuel and controlling fuel flow without a carburetor, to control the amount of fuel supplied to said engine according to said combustion air and said fuel flow velocity. - View Dependent Claims (2, 3, 4)
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5. A feedback fuel metering control system for an internal combustion engine having air intake means supplying combustion air to said engine, and fuel supply means supplying fuel to said engine, comprising:
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means sensing the amount of combustion air supplied to said engine; means between said fuel supply means and said engine and producing a fuel pressure drop; differential fuel pressure sensor means measuring the differential fuel pressure, FPD, across said means producing said fuel pressure drop; solenoid valve means between said fuel supply means and said means producing said fuel pressure drop and controlling the amount of fuel supplied to said last mentioned means, to control the amount of fuel supplied to said engine, wherein said differential fuel pressure varies from a low value at idle speed of said engine to a high value at top speed of said engine, and comprising amplifier means responsive to said differential fuel pressure sensor means and yielding an amplifier FPD output, and means for increasing the dynamic range of said control system by preventing saturation of said amplifier means over the range of said fuel pressure differential by reducing said amplified FPD output with increasing engine speed. - View Dependent Claims (6, 7, 8, 9, 10)
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- 11. A feedback fuel metering control system for an internal combustion engine having air intake means supplying combustion air to said engine, and fuel supply means supplying fuel to said engine, comprising means sensing the flow velocity of fuel supplied to said engine comprising fuel passage means having an outlet in said air intake means and having a restriction orifice producing a fuel pressure drop, differential fuel pressure sensor means measuring the differential fuel pressure across said orifice indicating fuel flow velocity, and means feeding back said indicated fuel flow velocity to said fuel supply means to control the amount of fuel supplied, wherein said air intake means includes an air venturi with a restricted portion supplying combustion air to said engine, and wherein said fuel outlet is upstream of said restricted portion of said air venturi.
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13. A feedback fuel metering control system for an internal combustion engine having air intake means supplying combustion air to said engine, and fuel supply means supplying fuel to said engine, comprising:
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means sensing the amount of combustion air supplied to said engine comprising a first venturi supplying combustion air to said engine and producing an air pressure drop indicating air flow velocity; means sensing the flow velocity of fuel supplied to said engine comprising fuel passage means having an outlet in said air intake means downstream of said first venturi means and having a restriction orifice producing a fuel pressure drop indicating fuel flow velocity; said intake means including a second venturi downstream of said fuel outlet and supplying combustion air from said first venturi and atomized fuel from said fuel outlet to said engine; means responsive to said means sensing said amount of combustion air and to said means sensing fuel flow velocity and controlling said fuel supply means to control the amount of fuel supplied according to said combustion air and said fuel flow velocity. - View Dependent Claims (14, 15)
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16. A feedback fuel metering control system for an internal combustion engine having air intake means supplying combustion air to said engine, and fuel supply means supplying fuel to said engine, comprising:
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means sensing the amount of combustion air supplied to said engine; fuel flow velocity sensing means between said fuel supply means and said engine and comprising means producing a fuel pressure drop, and means measuring the differential fuel pressure across said means producing said fuel pressure drop; tachometer means for measuring engine speed; means for dividing said fuel pressure differential by engine speed; means responsive to said fuel pressure differential divided by said engine speed and to said amount of combustion air and controlling said fuel supply means. - View Dependent Claims (17, 18)
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19. A mass flow feedback fuel metering control system for an internal combustion engine having air intake means supplying combustion air to said engine, and fuel supply means supplying fuel to said engine, comprising:
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means including venturi means sensing the flow velocity of said combustion air; means sensing the mass of said combustion air; means sensing the flow velocity of said fuel; means responsive to said last three mentioned means and controlling said fuel supply means to control the amount of fuel supplied according to said air flow velocity, said air mass said said fuel flow velocity; wherein; said venturi means is in said air intake means and produces an air pressure drop; said means sensing air flow velocity comprises differential air pressure sensor means measuring the differential air pressure between the absolute air pressure outside of said venturi means and the reduced air pressure in said venturi means; said means sensing air mass comprises temperature sensor means measuring air temperature, and absolute air pressure sensor means measuring absolute air pressure outside of said first venturi means; said means sensing fuel flow velocity is between said fuel supply means and said engine and comprises means producing a fuel pressure drop; said means sensing fuel flow velocity further comprises differential pressure sensor means measuring the differential fuel pressure across said means producing said fuel pressure drop; said means controlling said fuel supply means responds to said differential air pressure, said air temperature, said absolute air pressure and said differential fuel pressure, without input from a throttle position sensor and without a constant fuel pressure regulator.
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20. A mass flow feedback fuel metering control system for an internal combustion engine having air intake means supplying combustion air to said engine, and fuel supply means supplying fuel to said engine, comprising:
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venturi means in said air intake means and producing an air pressure drop; absolute air pressure sensor means measuring absolute air pressure PA outside of said first venturi means; differential air pressure sensor means measuring the differential air pressure PD between the absolute air pressure outside of said venturi means and the reduced air pressure in said venturi means; temperature sensor means measuring air temperature T; tachometer means measuring engine speed S; divider means dividing PD by S; multiplier means multiplying PD /S by PA ; divider means dividing PD PA /S by T; means between said fuel supply means and said engine and producing a fuel pressure drop; differential fuel pressure sensor means measuring differential fuel pressure FPD across said means producing said fuel pressure drop; divider means dividing FPD by S; comparator means having first and second comparing inputs from said last two mentioned divider means, and having an output; solenoid valve means between said fuel supply means and said means producing said fuel pressure drop for controlling the amount of fuel supplied to said last mentioned means, said solenoid valve means being controlled by said output of said comparator means. - View Dependent Claims (21)
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- 22. A feedback fuel metering control system for an internal combustion engine, comprising air intake means supplying combustion air to said engine, fuel supply means including a low pressure fuel pump and means metering pumped fuel from said fuel pump to a fuel line supplying fuel to said engine without a carburetor, without a high pressure fuel pump, without high pressure fuel injectors, and without a constant fuel pressure regulator, means sensing the flow velocity of fuel in said fuel line comprising a restriction orifice in said fuel line producing a fuel pressure drop therein, differential fuel pressure sensor means measuring the differential fuel pressure across said orifice indicating fuel flow velocity in said fuel line, means feeding back said indicated fuel flow velocity to said fuel metering means to control the amount of metered pumped fuel in said fuel line, and an air line connected to said fuel line downstream of said restriction orifice.
Specification