US 4,227,497 A · Fuel metering and transfer control system

Abstract

An auxiliary fuel metering and transfer control system for an internal combustion engine. The system consists essentially of a pressure vessel for storage of propane, methane, natural gas or a similar gaseous fuel, a pressure regulator for maintaining constant gaseous fuel pressure during operation of the system, a solenoid valve and a magnetic reset safety switch, a metering valve, a transfer valve and an auxiliary fuel nozzle positioned in the Venturi of the carburetor on the engine using the system. The metering valve operates in response to changes in the intake manifold vacuum of the engine and changes in the air velocity in the carburetor of the engine. The transfer valve operates in response to movement of the throttle linkage on the carburetor of the engine. During operation of the engine, the system is substituted for both the idle circuit or system and the acceleration circuit or system of the carburetor.

Claims6

Dependent claims

An auxiliary fuel metering and transfer control system for an internal combustion engine, comprising:

(a) a pressure vessel, having a shut-off valve and a gas outlet, for storage of propane, methane, natural gas or a similar gaseous fuel;
(b) a pressure regulator, fitted on said gas outlet, which maintains a constant gaseous fuel pressure during operation of the system;
(c) a metering valve which operates in response to changes in the intake manifold vacuum of the engine and changes in the air velocity in the carburetor of the engine;
(d) a transfer valve which operates in response to movement of the throttle linkage on the carburetor of the engine;
(e) an auxiliary fuel nozzle positioned immediately above the outlet of the main nozzle in the center of the Venturi of the carburetor;
(f) a fuel line for flow of gaseous fuel from said gas outlet of said pressure vessel into said metering valve;
(g) means for flow of gaseous fuel from said metering valve into said transfer valve;
and
(h) a fuel line for flow of gaseous fuel from said transfer valve into said auxiliary fuel nozzle for injection into the Venturi of the carburetor.

6 more elements

An auxiliary fuel metering and transfer control system for an internal combustion engine, comprising:

(a) a pressure vessel, having a shut-off valve and a gas outlet, for storage of propane, methane, natural gas or a similar gaseous fuel;
(b) a pressure regulator, fitted on said gas outlet, which maintains a constant gaseous fuel pressure during operation of the system;
(c) a metering valve comprised of a valve body having a first vacuum chamber and a vacuum line connecting said first vacuum chamber and a port through the wall of the carburetor of the engine, a second vacuum chamber and a vacuum line connecting said second vacuum chamber and a port through the wall of the intake manifold of the engine, a first gas passageway for flow of gaseous fuel entering said metering valve and a second gas passageway for flow of gaseous fuel entering said metering valve;
a piston movably positioned to separate said first vacuum chamber and said second vacuum chamber;
a metering needle rigidly attached to said piston and movably positioned in said first gas passageway;
a spring positioned in said first vacuum chamber to apply force on said piston and bias said metering needle in a closed mode;
an idle adjustment needle positioned in said second gas passageway;
a connector tube for flow of gaseous fuel from said first gas passageway;
and a connector tube for flow of gaseous fuel from said second gas passageway;
(d) a fuel line for flow of gaseous fuel from said gas outlet of said pressure vessel into said first gas passageway and said second gas passageway of said metering valve;
(e) a solenoid valve located in said fuel line and operated by electric energy from the electrical circuit of an automotive vehicle using the system;
(f) a magnetic reset safety switch located in the electrical circuit of an automotive vehicle using the system;
(g) a transfer valve comprised of a valve body having a first connector tube and a first inlet port for receipt of gaseous fuel from said first connector tube of said metering valve, a second connector tube and a second inlet port for receipt of gaseous fuel from said second connector tube of said metering valve, a first outlet port for discharge of gaseous fuel entering said transfer valve through said first inlet port and a second outlet port for discharge of gaseous fuel entering said transfer valve through said second inlet port;
a dual action spool movably positioned in said valve body, said dual action spool having a first control position which prevents gaseous fuel from departing said transfer valve through said first outlet port while allowing gaseous fuel to depart said transfer valve through said second outlet port and a second control position which prevents gaseous fuel from departing said transfer valve through said first outlet port while allowing gaseous fuel to depart said transfer valve through said first outlet port;
a valve operator operatively connected to said dual action spool;
mechanical means for connecting said valve operator and the throttle linkage on the carburetor;
and an adaptor for connecting said first outlet port and said second outlet port;
(h) a first flexible hose for connecting said first connector tube on said metering valve and said first connector tube on said transfer valve;
(i) a second flexible hose for connecting said second connector tube on said metering valve and said second connector tube on said transfer valve;
(j) an auxiliary fuel nozzle positioned immediately above the outlet of the main nozzle in the center of the Venturi of the carburetor;
and
(k) a fuel line connecting said adapter on said transfer valve and said auxiliary fuel nozzle.

19 more elements

Dependencies are inferred from the claim text.

Fuel metering and transfer control system

Life of this patent

Fuel metering and transfer control system

Life of this patent

Abstract

Claims6