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Dual fuel injector and common rail fuel system using same

A technology of fuel injectors and injectors, which is applied in the direction of fuel injection devices, charging systems, machines/engines, etc., and can solve problems such as difficulties

Inactive Publication Date: 2014-03-26
CATERPILLAR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although dual fuel common rail systems are known in the prior art, it has been difficult to find a combination of structures and features that make the system commercially viable

Method used

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  • Dual fuel injector and common rail fuel system using same
  • Dual fuel injector and common rail fuel system using same

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Embodiment Construction

[0009] refer to figure 1 and figure 2 , the engine 7 comprising a plurality of cylinders 8 may be equipped with a common rail fuel system 10 . Each of the plurality of fuel injectors 13 is mounted for direct injection into one of the plurality of engine cylinders 8 . Each fuel injector 13 includes an injector body 40 defining a first fuel inlet 42 fluidly connected to the first common rail 11 and a second fuel inlet 43 fluidly connected to the second common rail 12 . In the illustrated embodiment, the first common rail 11 may contain liquid diesel fuel and the second common rail 12 may contain pressurized natural gas fuel. The engine 7 may be a compression ignition engine which generally ignites by compression a small amount of liquid diesel fuel which in turn ignites a larger amount of natural gas, wherein the two fuels are supplied to a single cylinder 8 by means of one fuel injector 13 . The injector body 40 also defines a first nozzle outlet set 44 for injecting liquid...

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Abstract

In one aspect, a common rail fuel system includes a plurality of fuel injectors that each includes an injector body defining a first fuel inlet fluidly connected to a first common rail and a second fuel inlet fluidly connected to a second common rail. Liquid fuel injection from a first nozzle outlet set is facilitated by energizing a first electrical actuator to open a direct operated check. Injection of gaseous fuel from a second nozzle outlet set is facilitated by energizing a second electrical actuator to open an admission valve to flood a gaseous nozzle chamber with high pressure gaseous fuel above a valve opening pressure that opens a conventional spring biased check to facilitate gaseous fuel injection out of second nozzle outlet set.

Description

technical field [0001] The present invention relates generally to a dual fuel common rail system, and more particularly to a dual fuel injector. Background technique [0002] Fuel injectors having the capability of injecting two fuels that differ in at least one of pressure, chemical property and phase are known in the prior art. For example, US Patent 7,373,931 teaches a fuel injection system for injecting liquid diesel fuel and natural gas fuel from a single fuel injector into a compression ignition engine. In this type of system, a relatively small amount of liquid diesel fuel is injected and compressed to ignite to ignite a larger amount of natural gas. One strategy for this type of dual fuel system is to utilize a common rail structure and strategy for supplying both pressurized liquid diesel fuel and natural gas fuel to a single fuel injector. Although dual fuel common rail systems are known in the prior art, it has been difficult to find a combination of structures ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M43/04F02M47/02F02M51/00F02M55/02
CPCF02M43/04F02M45/086F02M47/027F02M63/0285
Inventor C·A·布朗D·H·吉布森
Owner CATERPILLAR INC
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