Method and apparatus for fuel mixture control
First Claim
1. An apparatus for controlling the fuel-to-air ratio of the combustible mixture for an internal combustion engine, said engine including an induction tube, an air throttle valve contained in said induction tube and a fuel metering system for providing fuel to the air admitted through said induction tube, and wherein the improvement comprises:
- means for generating a first electrical analog signal related to the degree of opening of said air throttle valve;
means for generating a second electrical analog signal related to the actual engine speed (rpm);
electronic circuit means for receiving said first and second electrical analog signals and for generating therefrom an analog output datum equal to the smaller of said first and second analog signals; and
means for coupling said analog output datum to said fuel metering system;
whereby the fuel-to-air ratio of said combustible mixture provided to said engine is set to predetermined values.
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Accused Products
Abstract
The fuel mixture ratio of an internal combustion engine is adjusted by metering out a fuel quantity in relation to the air flow rate through the induction tube. The air flow rate is measured indirectly by monitoring the engine speed (rpm) with an electrical transducer driving a frequency-voltage converter, thus providing a first voltage, while a throttle plate position transducer generates a second voltage. The two voltages are applied to a logical circuit including parallel diodes which selects the lower of the applied signals and presents the resultant voltage as the primary control signal for fuel metering. Various compensating networks may be added to provide additional smoothing and adaptation to the operating characteristics of a particular engine and state of operation. Various fuel metering devices to be used in conjunction with the control circuit are also described.
24 Citations
18 Claims
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1. An apparatus for controlling the fuel-to-air ratio of the combustible mixture for an internal combustion engine, said engine including an induction tube, an air throttle valve contained in said induction tube and a fuel metering system for providing fuel to the air admitted through said induction tube, and wherein the improvement comprises:
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means for generating a first electrical analog signal related to the degree of opening of said air throttle valve; means for generating a second electrical analog signal related to the actual engine speed (rpm); electronic circuit means for receiving said first and second electrical analog signals and for generating therefrom an analog output datum equal to the smaller of said first and second analog signals; and means for coupling said analog output datum to said fuel metering system; whereby the fuel-to-air ratio of said combustible mixture provided to said engine is set to predetermined values. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification