초록 ▼

An internal combustion engine dual fuel system for controllably running the internal combustion engine on a liquid fuel, such as gasoline, in the usual manner or, at will, on liquified petroleum (LP) gaseous fuel. The conventional liquid fuel system of the internal combustion engine is unmodified ex

An internal combustion engine dual fuel system for controllably running the internal combustion engine on a liquid fuel, such as gasoline, in the usual manner or, at will, on liquified petroleum (LP) gaseous fuel. The conventional liquid fuel system of the internal combustion engine is unmodified except for the addition of a remotely controlled shut-off valve in the fuel line at the carburetor fuel inlet. An LP gas suction verturi is disposed in the air induction flow to the carburetor inlet, for example by being mounted in the air filter above the carburetor inlet, and is supplied in fuel from the vapor phase of an LP gas, such as butane or propane, above the level of the liquified gas in an appropriate tank. The LP gas tank and the line supplying the gas to the carburetor air inlet are maintained at a substantially constant temperature via a by-pass of the engine coolant circuit, the flow of coolant through the by-pass being automatically controlled by a thermostat. A manual control, in the form of an electrical switch, is provided for shutting off the flow of LP gas while running the engine on conventional liquid fuel, and shutting off the flow of liquid fuel to the carburetor while running the engine on LP gas.

대표청구항 ▼

An LP gas fuel feed system for an internal combustion engine having an intake for a fuel-air mixture, said fuel feed system comprising a tank containing said LP gas under pressure in a liquid form, first gas conduit means having an inlet disposed in said tank above the level of said LP gas in a gase

An LP gas fuel feed system for an internal combustion engine having an intake for a fuel-air mixture, said fuel feed system comprising a tank containing said LP gas under pressure in a liquid form, first gas conduit means having an inlet disposed in said tank above the level of said LP gas in a gaseous form, second gas conduit means, pressure regulator means between said first and second gas conduit means for reducing the pressure of said LP gas in a gaseous form during passage from said first gas conduit means to said second gas conduit means, an expansion chamber in said second gas conduit means, gas flow modulation means for modulating the flow of said gas through said second gas conduit means as a function of power requirement of said engine, means at the end of said second conduit means for supplying a mixture of said gas and of air at the intake of said internal combustion engine, means for heating said tank, said expansion chamber and at least a portion of said conduit means, and means for maintaining said tank at a predetermined temperature.