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Method and apparatus for gaseous fuel injection into IC engine and controlling combustion

A gaseous fuel and internal combustion engine technology, applied in the direction of fuel injection control, gaseous engine fuel, and adding non-fuel substances to fuel, etc., can solve the problems of lean mixture of fuel and air, reduced engine cycle efficiency, and inability to support premixed combustion, etc.

Inactive Publication Date: 2003-12-03
WESTPORT POWER +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these measures lead to a corresponding reduction in engine cycle efficiency (i.e. not getting as much power from each piston stroke)
[0004] Another disadvantage of the known dual fuel approach is that at low engine loads the mixture of fuel and air becomes too lean to support stable premixed combustion and leads to incomplete combustion and misfire
Intake air flow can be throttled to maintain a mixture that can sustain mixed combustion, but throttling can adversely affect engine efficiency

Method used

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  • Method and apparatus for gaseous fuel injection into IC engine and controlling combustion
  • Method and apparatus for gaseous fuel injection into IC engine and controlling combustion
  • Method and apparatus for gaseous fuel injection into IC engine and controlling combustion

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Embodiment Construction

[0048] In a preferred method, fuel is injected into cylinders of a four-stroke internal combustion engine having at least one reciprocating piston and a crankshaft connected to the piston. In this disclosure, the piston position within the cylinder is described with reference to crankshaft angles before or after top dead center (TDC). When the piston reaches the end of its upward stroke and is about to begin its downward stroke (ie, the point at which the piston is closest to the cylinder head), the piston is at TDC.

[0049] The method involves a primary fuel, preferably a gaseous fuel such as natural gas, propane, biogas, methane, or hydrogen. The method may also include controlling the timing of combustion of the primary gas with the ignition source. The ignition source may be, for example, a pilot fuel which is more prone to spontaneous combustion than the primary fuel, a hot surface ignition source such as a glow plug, a spark plug, or other known ignition means. When a...

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Abstract

A method and apparatus for introducing gaseous fuel into a piston cylinder (310) of an operating internal combustion engine in two separate stages involves monitoring a set of engine parameters, determining engine load and engine speed from the set of engine parameters, in a first stage, introducing a first portion of the gaseous fuel into the cylinder (310) where the first portion of gaseous fuel forms a substantially homogeneous mixture comprising gaseous fuel and air prior to combustion, and in a second stage, occurring sequentially after the first stage, introducing a second portion of the gaseous fuel into the cylinder (310). The gaseous fuel quantity is variable in response to at least one of engine load and engine speed. Initiation and duration for at least one of the first and second stages is also variable in response to at least one of engine load and engine speed.

Description

technical field [0001] The present invention relates to a method and apparatus for introducing a gaseous fuel into a cylinder of an internal combustion engine, and more particularly, the present invention relates to two-stage injection of a gaseous fuel into a cylinder of an engine to control the combustion mode of the gaseous fuel introduced in two stages methods and devices. Background technique [0002] The internal combustion engine industry is under increasing pressure to reduce pollution of the environment by reducing harmful engine emissions, and one response to this pressure has led to the replacement of diesel with natural gas for compression ignition (CI) engines, also known as diesel engines. Natural gas is a relatively clean-burning fuel compared to diesel, and replacing diesel with natural gas can reduce nitrogen oxide (NOx) and particulate matter (PM) emissions. A known technique for substituting diesel for natural gas is so called dual fuel operation. In thi...

Claims

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Application Information

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IPC IPC(8): F02B1/12F02B3/06F02B7/08F02B23/06F02B43/00F02B69/04F02B75/02F02D19/02F02D19/10F02D21/08F02D41/00F02D41/02F02D41/04F02D41/30F02D41/38F02D41/40F02D45/00F02M21/02F02M21/08F02M25/00F02M25/07F02M37/00
CPCY02T10/125F02D41/402Y02T10/123F02B43/00F02D19/0694F02D41/0062F02D19/061F02B1/12F02B23/0621F02B3/06Y02T10/44F02B2275/14F02D35/027F02B69/04F02B2275/16F02B23/0672F02D19/0689F02D41/005F02D19/10F02D41/0072F02B7/08Y02T10/32F02D41/0027F02D41/3035F02D19/024F02D19/023F02B23/0669F02D2041/389F02D19/0692F02D41/403Y02T10/128F02B2075/025Y02T10/12Y02T10/30Y02T10/40
Inventor 理查德·安西默桑迪普·芒希帕特里克·奥利特康斯坦丁·塔宁戴维·A·鲁思曼斯多尔弗
Owner WESTPORT POWER
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