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Method of controlling a dual fuel engine

A dual-fuel, engine technology, used in combustion engines, internal combustion piston engines, engine control, etc., to achieve the effect of low HC emissions

Active Publication Date: 2019-08-27
WARTSILA FINLAND OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as with switching from pilot operation to diesel-only operation, the change in the amount of diesel fuel supplied is delayed and then changed in increments or steps rather than abruptly

Method used

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  • Method of controlling a dual fuel engine
  • Method of controlling a dual fuel engine
  • Method of controlling a dual fuel engine

Examples

Experimental program
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Embodiment Construction

[0030] exist figure 1 , shows how the concept of mode switching according to US 7,913,673 is performed. This has been explained above in the background of the invention.

[0031] exist figure 2 , a schematic engine configuration in which the method of the present invention may be used is shown. figure 2 A common rail dual fuel engine 1 is shown in which the pilot fuel injector 2 and the main liquid fuel injector 2 are identical. The same method works equally well when the main and pilot injectors are different, so the principle also works on a conventional dual fuel system with a pulsating pump and a pilot injector (not shown in the figure). In gas mode, gas 11 is premixed with air 12 in intake manifold 6 to form gas 10 to be fed into cylinder 5 . Thus, when operating, in gas mode the intake manifold 6 contains a quantity of gas 10 mixture, while in liquid fuel mode the intake manifold contains only air. The gas 10 fed to the cylinder 5 is controlled by the intake valve...

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Abstract

A method in controlling a dual fuel internal combustion four-stroke piston engine (1) comprising - a number of cylinders (5), a piston (50) is movable in a reciprocating manner between a top dead center (TDC) and a bottom dead center (BDC) inside the cylinder (5) defining a combustion chamber, - the engine (1) is configured to operate in two modes: - a gas mode for using gaseous main fuel (10), and - a liquid fuel mode for using liquid fuel (20) injected directly to the cylinder (5), - the engine (1) is configured to switch between the modes when needed, - in a situation where a trip or other shift from the gas mode to the liquid mode occurs on a running engine (1), the liquid fuel (20) is injected during a combustion stroke after the piston (50) has passed the top dead center (TDC) when the piston (50) is already moving towards the bottom dead center (BDC).

Description

technical field [0001] The present invention generally relates to the technology of internal combustion engines such as large dual fuel engines. In particular, the invention relates to the way in which fuel feed is controlled during and immediately after a change in operating state. [0002] More precisely, the invention relates to a method of controlling a dual-fuel internal combustion four-stroke piston engine comprising: [0003] - a plurality of cylinders, each cylinder comprising a cylinder head and cylinder walls, a piston movable in a reciprocating manner between top dead center (TDC) and bottom dead center (BDC) within said cylinder defining a combustion chamber; [0004] - said piston is connected to a crankshaft via a connecting rod, wherein reciprocating motion of said piston is converted into rotational motion of said crankshaft; [0005] - said engine is configured to operate in two modes: [0006] - gas mode using gaseous primary fuel; and [0007] - a liquid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D41/40F02D19/06F02D19/08F02D19/10F02D41/00
CPCF02D19/061F02D19/0689F02D19/081F02D19/10F02D41/0025F02D41/401Y02T10/30Y02T10/40F02D19/0613
Inventor V·诺德曼M·阿克塞尔松J·奥斯特曼
Owner WARTSILA FINLAND OY