Injectors, methods, and systems for dual fuel combustion
OwnerDeyang Houinventor
Life of this patent
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Abstract
A fuel injector for adaptive dual fuel injections has means to directly inject two types of fuels, which can be gas and liquid, or liquid and liquid, independently and collaboratively through a single nozzle. A fuel injection method and systems, along with a combustion method using the same, are also disclosed. The disclosed injectors, methods, and systems are applicable for conventional gas and liquid fuels, such as diesel, gasoline, natural gas, propane, as well as renewable liquid and gas fuels in general, including e-fuels, such as biodiesel, methanol, ethanol, hydrogen, biomethane, etc.
Claims16
A fuel injector, comprising:
- a nozzle body comprising passages for fuels, an inner cylindrical bore for receiving two longitudinally displaceable coaxial needle valves, at least one group of fuel injection outlets in said nozzle body, at least one spring which urges the needle valves into biased seating positions to block fuels, and
- a valve block to hold control valves and having fuel inlets which can be connected to two pressured fuel reservoirs, pressure control chambers which can press and release needle valves through connecting to pressurized and depressurized fuels, and the two pressure control chambers for the two needle valves are connected to the same fuel reservoir which contains fuel with higher lubricity among the pressured fuel reservoirs, wherein liquid fuel with higher lubricity is used for controlling actuations and lubricating the needle valve for low lubricity fuel,
- wherein the fuel injector is used for gas-liquid dual fuel injections and gas is a major fuel, wherein the control chamber for large needle valve, which is for blocking gas flow, is connected to pressured liquid fuel reservoir, wherein the liquid fuel presses down the gas needle valve while lubricating the gas needle valve along matched sliding surface between the needle valve and nozzle body.
A fuel injector, comprising:
- a nozzle body comprising passages for fuels, an inner cylindrical bore for receiving a composite needle valve which can move up and down in axial direction,
- at least one group of fuel injection outlets in said nozzle body, at least one spring which urges said composite needle valve into a biased seating position to block fuels, and a valve block holding control valves and having fuel inlets connected to at least one of pressured fuel reservoirs, a pressure control chamber, which is connected to the same pressured fuel reservoir which contains higher lubricity fuel among the pressured fuel reservoirs, the said control chamber can be used to press and release the said composite needle valve, wherein said composite needle valve contains a one way check valve.
A fuel injection method, which directly injects both liquid and gas fuel on-demand, wherein the injections of two types of fuels can be independently or simultaneously through the same nozzle tip, and liquid fuel is used for controlling gas fuel injection actuations, enhancing cooling and sealing, and lubricating gas injection needle valves, wherein the fuel injection method is for internal combustion engines applications, partial gas fuel is injected through engine ports during high loads and medium loads, all gas fuel is directly injected into combustion chamber during light loads.
Dependencies are inferred from the claim text.