Fuel injection systems

Claim 1

A device for feeding internal combustion engines by indirect injection applied independently to each cylinder into an induction pipe upstream of an inlet valve, comprising: a. a set of concentric stepped venturi means, disposed upstream of said inlet valve of each cylinder in an induction choke, for providing a substantially sonic gaseous flow of air; and b. an adjustable injection means for delivering metered amounts of fuel into the neck portion of the central venturi means of said set of stepped venturi means, wherein an adjustable quantity of fuel is injected into the gaseous flow of air induced by said stepped venturi means and wherein said central venturi means includes an external cylinder having a shoulder in which a circular groove is formed; and said adjustable injection means includes a radial feed passage connEcted to said circular groove, said shoulder being fitted into a supporting socket, said central venturi means having at least two radial holes formed in diametrally opposite positions and symmetrically in relation to said radial feed passage for interconnecting said circular groove and said neck portion of said central venturi means and wherein the length of a divergent cone of said central venturi means is about ten times its inner diameter measured across its neck portion.

Claim 2

A device for feeding internal combustion engines by indirect injection applied independently to each cylinder into an induction pipe upstream of an inlet valve, comprising: a. a set of concentric stepped venturi means, disposed upstream of said inlet valve of each cylinder in an induction choke, for providing a substantially sonic gaseous flow of air; and b. an adjustable injection means for delivering metered amounts of fuel into the neck portion of the central venturi means of said set of stepped venturi means, wherein an adjustable quantity of fuel is injected into the gaseous flow of air induced by said stepped venturi means and wherein said central venturi means includes an external cylinder having a shoulder in which a circular groove is formed; and said adjustable injection means includes a radial feed passage connEcted to said circular groove, said shoulder being fitted into a supporting socket, said central venturi means having at least two radial holes formed in diametrally opposite positions and symmetrically in relation to said radial feed passage for interconnecting said circular groove and said neck portion of said central venturi means and wherein the length of a divergent cone of said central venturi means is about ten times its inner diameter measured across its neck portion.

Claim 3

A device for feeding internal combustion engines by indirect injection applied independently to each cylinder into an induction pipe upstream of an inlet valve, comprising: a. a first set of concentric stepped venturi means, disposed upstream of said inlet valve of each cylinder in an induction choke, for providing a substantially sonic gaseous flow of air; b. a first adjustable injection means for delivering metered amounts of fuel at high engine speeds through an injection passage into the neck portion of the central venturi means of said first set of stepped venturi means, wherein an adjustable quantity of fuel is injected into the gaseous flow of air induced by said first set of stepped venturi means and wherein the length of a divergent cone of said central venturi means is at least three times the diameter of the neck portion of another venturi means of said set of stepped venturi means in which the outlet end of the divergent cone of said central venturi means is positioned; and c. a second adjustable injection means for delivering fuel at idling and low engine speeds into said induction pipe downstream of said first set of concentric stepped venturi means.

Claim 4

A device for feeding internal combustion engines by indirect injection applied independently to each cylinder into an induction pipe upstream of an inlet valve, comprising: a. a first set of concentric stepped venturi means, disposed upstream of said inlet valve of each cylinder in an induction choke, for providing a substantially sonic gaseous flow of air; b. a first adjustable injection means for delivering metered amounts of fuel at high engine speeds through an injection passage into the neck portion of the central venturi means of said first set of stepped venturi means, wherein an adjustable quantity of fuel is injected into the gaseous flow of air induced by said first set of stepped venturi means and wherein the length of a divergent cone of said central venturi means is at least three times the diameter of the neck portion of another venturi means of said set of stepped venturi means in which the outlet end of the divergent cone of said central venturi means is positioned; and c. a second adjustable injection means for delivering fuel at idling and low engine speeds into said induction pipe downstream of said first set of concentric stepped venturi means.

Claim 5

A device for feeding internal combustion engines by indirect injection applied independently to each cylinder into an induction pipe upstream of an inlet valve, comprising; a. a first set of concentric stepped venturi means, disposed upstream of said inlet valve of each cylinder in an induction choke, for providing a substantially sonic gaseous flow of air; b. a first adjustable injection means for delivering metered amounts of fuel at high engine speeds through an injection passage into the neck portion of the central venturi means of said first set of stepped venturi means, wherein an adjustable quantity of fuel is injected into the gaseous flow of air induced by said first set of stepped venturi means and wherein said central venturi means includes an external cylinder having a shoulder in which a circular groove is formed, and said first adjustable injection means includes a radial feed passage connected to said circular groove, said shoulder being fitted into a supporting socket, said central venturi means having at least two radial holes formed in diametrally opposite positions and symmetrically, in relation to said radial feed passage for interconnecting said circular groove and said neck portion of said central venturi means; and c. a second adjustable injection means for delivering fuel at idling and low engine speeds into said induction pipe downstream of said first set of concentric stepped venturi means.

Claim 6

A device for feeding internal combustion engines by indirect injection applied independently to each cylinder into an induction pipe upstream of an inlet valve, comprising; a. a first set of concentric stepped venturi means, disposed upstream of said inlet valve of each cylinder in an induction choke, for providing a substantially sonic gaseous flow of air; b. a first adjustable injection means for delivering metered amounts of fuel at high engine speeds through an injection passage into the neck portion of the central venturi means of said first set of stepped venturi means, wherein an adjustable quantity of fuel is injected into the gaseous flow of air induced by said first set of stepped venturi means and wherein said central venturi means includes an external cylinder having a shoulder in which a circular groove is formed, and said first adjustable injection means includes a radial feed passage connected to said circular groove, said shoulder being fitted into a supporting socket, said central venturi means having at least two radial holes formed in diametrally opposite positions and symmetrically, in relation to said radial feed passage for interconnecting said circular groove and said neck portion of said central venturi means; and c. a second adjustable injection means for delivering fuel at idling and low engine speeds into said induction pipe downstream of said first set of concentric stepped venturi means.