Dual fuel injection valve and method of operating a dual fuel injection valve
A technology of fuel injection and injection valve, which is applied in fuel injection pumps, fuel injection devices, special fuel injection devices, etc., and can solve problems such as high temperature and pressure
Inactive Publication Date: 2005-03-02
WESTPORT POWER
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Problems solved by technology
[0004] A problem associated with gaseous fuels such as natural gas is that, in order to self-ignite such fuels, typically very high temperatures and pressures are required compared to diesel
Method used
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[0156] A dual fuel injection valve capable of independently and separately injecting a pilot fuel and a main fuel into a combustion chamber in an internal combustion engine. That is, the injection valve can independently control the injection timing and fuel quantity for the pilot fuel and the main fuel. In addition, the pilot fuel and the main fuel are respectively injected into the combustion chamber through different injection ports.
[0157] The primary fuel is a fuel that burns cleaner than conventional diesel so that the use of this primary fuel in place of diesel results in less particulate matter and / or nitrogen oxides (NOx ) has less emissions. Preferably, said primary fuel accounts for more than 90% of the fuel consumed by the engine, measured on an energy basis, on average.
[0158] In preferred embodiments, the primary fuel is a gaseous fuel, such as natural gas, propane or hydrogen, and the pilot fuel is a liquid fuel, such as diesel or dimethyl ether. The main...
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A dual fuel injection valve separately and independently injects two different fuels and comprises a dual needle assembly with a hollow open-ended outer needle and an inner needle disposed within the hollow interior. A cap cooperates with the outer needle to cover the open end, and the outer needle and the cap together comprise the inner valve body. The outer and inner needles are each movable independently from each other between respective open and closed positions. A spring disposed between the cap and the inner needle contributes to biasing the inner needle in the closed position. The cap can be joined to the outer needle, whereby the cap can provide a limit to the movement of the inner needle. In another embodiment the cap can be detached from the outer body, allowing the spring to space the cap away from the outer needle, assisting with biasing the outer needle closed.
Description
technical field [0001] The present invention relates to a hydraulically actuatable dual fuel injection valve and a dual needle arrangement for injecting two different fuels into a combustion chamber in an internal combustion engine. Background technique [0002] Due to its availability, low cost and potential to reduce particulate emissions, natural gas is a viable alternative to diesel for fueling compression ignition engines, often referred to as "Diesel cycle" engines. Those skilled in the related art will appreciate that natural gas is only one example of a preferred fuel, and that other fuels are suitable, such as hydrogen, propane, and other fuels used as clean burning alternatives to diesel. A clean-burning alternative to diesel is defined as a fuel that can be used in an engine to substantially match the performance of a diesel engine while having lower emissions of particulate matter and / or nitrogen oxides (NOx) emissions. [0003] The conventional method of intro...
Claims
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IPC IPC(8): F02M21/02F02M43/02F02M43/04F02M45/08F02M47/02F02M47/04F02M47/06F02M57/02F02M59/10F02M61/16F02M61/18F02M61/20F02M63/00
CPCF02M45/086F02M61/20F02M63/0064F02D19/0694F02D19/10F02M57/025F02M47/046F02M43/02F02M47/06F02M43/04Y02T10/32F02M47/027F02M2200/46F02M59/105F02M21/0263F02M61/168F02M61/182F02M21/0254F02M47/043Y02T10/30
Inventor S·迈克尔·贝克戴维·芒福德阿德里安·J·波斯特蒂莫西·N·伦诺克斯布拉德利·D·杜维尔阿兰·M·J·图什特
Owner WESTPORT POWER