Method of fuel injection
AssigneeBiocom Pty. Ltd.
InventorChristopher P. Moore
Life of this patent
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Abstract
A method of operating a low boiling point liquid fuel injection system for an internal combustion engine (1) wherein the fuel is stored in a tank (17) and has a variable vapour pressure in the tank (17) dependent upon ambient temperature. The method comprises pumping the fuel to the fuel inlet rail (15) and injectors (8, 9, 10, 11) at an absolute pressure which is maintained at a constant differential above the variable vapour pressure in the tank (17), monitoring the absolute pressure of the fuel and varying the fuel injection pulse width dependent upon the absolute pressure of the fuel together with the other usual engine parameters. The method has particular application where the fuel is a liquified gas.
Claims11
A method of operating a low boiling point liquid fuel injection system for an internal combustion engine wherein the fuel is stored in a tank and has a vapour pressure in the tank dependent upon ambient temperature, the method comprising pumping the fuel to an operating pressure a fixed differential above the vapour pressure and monitoring the absolute pressure of the fuel and varying fuel injection timing for the fuel dependent upon the absolute pressure determined.
A fuel injection system for an internal combustion engine operating on a low boiling point liquid fuel comprising a tank for storage of liquid fuel, a pump means to raise the pressure of the fuel in fuel rail means, the fuel rail means extending to an injector or injectors for the fuel, the pump means adapted to raise the pressure of the fuel to a fixed pressure differential above the tank pressure, fuel return means extending from the injector or injectors to the tank and pressure regulation means in the fuel return means to regulate the pressure of the fuel in the fuel rail means.
Dependencies are inferred from the claim text.