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In-cylinder Dynamic Gas Blending Fuel Injector And Dual Fuel Engine

A technology of dual-fuel engines and fuel injectors, applied to internal combustion piston engines, combustion engines, fuel injection devices, etc.

Active Publication Date: 2014-07-16
CATERPILLAR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This approach can present challenges in controlling the sneaking of hydrocarbons into the exhaust due to the small amount of gaseous fuel present in the interstitial volume of the combustor

Method used

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  • In-cylinder Dynamic Gas Blending Fuel Injector And Dual Fuel Engine
  • In-cylinder Dynamic Gas Blending Fuel Injector And Dual Fuel Engine
  • In-cylinder Dynamic Gas Blending Fuel Injector And Dual Fuel Engine

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Embodiment Construction

[0013] first reference Figure 1-3 , a dual fuel engine 10 includes a dual fuel common rail system 20 mounted to an engine housing 11 defining a plurality of engine cylinders 12 . Piston 14 is positioned to reciprocate in each engine cylinder between a bottom dead center position and a top dead center position to define a compression ratio of greater than 14:1, which corresponds to a compression ratio that allows compression ignition of liquid diesel fuel in a manner known in the art. Compare. The dual fuel common rail system 20 includes exactly one fuel injector 25 positioned to inject directly into each of the plurality of engine cylinders 12 . A low pressure gaseous fuel common rail 21 and a high pressure liquid fuel common rail 22 are fluidly connected to each fuel injector 25 . Each fuel injector 25 also includes a drain outlet 105 ( Figure 5 ). A suitably designed pressure regulator 28 may be located in the discharge line 24 to maintain the pressure in the discharge...

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Abstract

The present invention relates to an in-cylinder dynamic gas blending fuel injector and a dual fuel engine. The dual fuel engine utilizes a compression ignited pilot injection of liquid diesel fuel to ignite a mixture of gaseous fuel and air in each engine cylinder. The gaseous fuel is injected at a relatively low pressure directly into the engine cylinder from a fuel injector. The liquid diesel fuel is injected directly into the engine cylinder from the same fuel injector. In-cylinder dynamic gas blending during the compression stroke can reduce potential hydrocarbon slip that could occur when unburned fuel resides in crevice volumes within the engine cylinder.

Description

technical field [0001] The present invention relates generally to dual fuel engines, and more particularly to fuel injectors that facilitate dynamic gas mixing within cylinders. Background technique [0002] Typical dual fuel engines operate at relatively low gas pressures (eg, 100-200 PSI), making in-cylinder injection difficult with conventional nozzle designs. In these engines, gaseous fuel is mixed with air by fumigation or port injection to provide a homogenous mixture for ignition with a small pilot injection of liquid diesel. In other words, a small injection of diesel fuel with compression ignition is used to ignite a homogeneous mixture of gaseous fuel and air in each cylinder. This approach can present challenges in controlling the sneaking of hydrocarbons into the exhaust due to the small amount of gaseous fuel present in the interstitial volume of the combustor. Commonly owned U.S. Patent Application Publication No. U.S. 2012 / 0187218 shows a dual fuel engine al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M43/04F02M51/06
CPCF02M45/086F02D19/0694F02D19/10F02M43/04F02M47/027Y02T10/30F02D19/0642F02D19/08
Inventor D·R·科尔德伦C·A·布朗
Owner CATERPILLAR INC