Electronic fuel injection system

Claim 2

The fuel injection system of claim 2 in which the pulse forming means comprises: a power supply circuit coupled to said pulse generating means, said power supply circuit producing an output voltage inversely proportional to the frequency of the pulses, and a pulse shaping circuit coupled to the pulse generating means, the power supply circuit and the electrical means attached to the air valve, said pulse shaping circuit producing a pulse having its width proportional to the output voltage of the power supply circuit and the electrical signal of said electrical means.

Claim 3

The fuel injection system of claim 3 comprising a manifold pressure sensing device connected to the air passage downstream of the throttle blade for sensing the pressure therein, and an electrical device connected to said manifold pressure sensing device for converting said pressure into an electrical signal representative of manifold pressure, said electrical signal representative of manifold pressure being coupled to said pulse shaping circuit to modify the width of the pulses produced thereby.

Claim 4

The fuel injection system of claim 4 in which the air valve depression sensing device also is connected to the air passage downstream of the throttle blade and the electrical signal of said air valve depression sensing device is representative of a predetermined blend of manifold pressure and air valve depression.

Claim 5

The fuel injection system of claim 5 in which said electrical devices are variable resistors and the resistance generated by the variable resistor connected to the air valve depression sensing device is coupled in series with the resistance generated by the variable resistor connected to the manifold pressure sensing device.

Claim 6

The fuel injection system of claim 6 comprising an electriCal resistor means, and a switch means for switching said resistor means into and out of connection with said electrical device attached to said air valve, and temperature responsive means for actuating said switch means, said resistor means being connected to said electrical device at low temperatures to increase the amount of fuel delivered by said injector.

Claim 7

The fuel injection system of claim 1 comprising a manifold pressure sensing device connected to the air passage downstream of the throttle blade for sensing the pressure therein, and an electrical device connected to said manifold pressure sensing device for converting said pressure into an electrical signal representative of manifold pressure, said electrical signal representative of manifold pressure being coupled to said electronic means to modify the amount of fuel delivered according to the manifold pressure.

Claim 8

The fuel injection system of claim 8 in which the electrical signal generated by the low manifold pressure representative of engine deceleration reduces the amount of fuel delivered by each operation of the injector.

Claim 9

The fuel injection system of claim 1 in which said electrical devices are variable resistors.

Claim 10

The fuel injection system of claim 1 comprising an electrical resistor means, and a switch means for switching said resistor means into and out of connection with said electrical device attached to said air valve, and temperature responsive means being connected to said electrical device at low temperatures to increase the amount of fuel delivered by said injector.

Claim 11

A fuel metering system for an internal combustion engine comprising an air passage for delivering air to said engine, said air passage containing an air valve positioned by the mass of air flowing through said passage and a manually operable throttle valve, said throttle valve being located downstream of the air valve, an electrical device attached to said air valve for converting the air valve position into a first electrical signal, vacuum motor means communicating with said air passage downstream of said throttle blade, said vacuum motor means being responsive to the intake manifold pressure of said engine, an electrical device attached to said vacuum motor means for converting the intake manifold pressure into a second electrical signal, the electronic means for controlling the amount of fuel metered to said engine as a function of said first and second electrical signals, said electronic means including a circuit for producing pulses at a frequency proportional to engine revolutionary speed and a circuit for shortening the duration of said pulses as a function of pulse frequency so the time integrated pulse area is independent of engine revolutionary speed, said electronic means changing pulse area according to said first and second electrical signals.

Claim 12

The fuel metering system of claim 12 comprising a second vacuum motor means communicating with said air passage between said air valve and said throttle valve, and an electrical device attached to said second vacuum motor means for producing a third electrical signal, said electronic means controlling the amount of fuel metered to said engine as a function of said three electrical signals.

Claim 13

The fuel metering system of claim 13 in which the electrical devices are variable resistors.

Claim 14

The fuel metering system of claim 14 comprising passage means connecting said second vacuum motor means with the air passage downstream of the throttle valve, and manually positionable control means in said passage means for adjusting the proportion of the vacuum signal passing through said passage means to said second vacuum motor.