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Fuel injection spray patterns for opposed-piston engines

A technology of internal combustion engine and mode, applied in the field of combustion chamber, which can solve the problems of reducing engine thermal efficiency and adverse effects

Active Publication Date: 2013-06-19
ACHATES POWERS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, charge air movement controlled by swirl can have adverse effects on the combustion process
For example, during combustion in a cylindrical combustion chamber defined between flat piston end faces, the vortex pushes the flame towards the cylinder bore, causing heat loss to the (relatively) cooler cylinder wall
The higher swirl velocity vector occurs close to the cylinder wall, which provides the worst case for heat loss: high temperature gas with velocity, which transfers heat to the cylinder wall and reduces the thermal efficiency of the engine

Method used

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  • Fuel injection spray patterns for opposed-piston engines
  • Fuel injection spray patterns for opposed-piston engines
  • Fuel injection spray patterns for opposed-piston engines

Examples

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Embodiment Construction

[0020] In the combustion chamber configuration to be described, an internal combustion engine comprises at least one cylinder with longitudinally separated exhaust and intake ports; see, for example, cylinder 10 shown in FIGS. 1 and 2 . A pair of pistons are oppositely disposed in the bore of the cylinder, and a combustion chamber structure is defined between opposing end surfaces of the pistons as the pistons move toward a top dead center position. A circumferential region is defined on the periphery of each end face. The combustion chamber includes a cavity defined between end faces and has opposing openings through which fuel is injected (hereinafter "injection ports") extending generally at least diametrically of the cylinder and opening into the cavity.

[0021] During operation of an internal combustion engine, as the piston approaches TDC, one or more squish zones direct a flow of compressed air (known as "squeeze") into the combustion chamber in at least one direction ...

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Abstract

A combustion chamber for an opposed-piston engine includes a squish zone defined between circumferential peripheral areas of opposing end surfaces of the pistons, a cavity defined by one or more bowls in the end surfaces, and at least one injection port that extends radially through the squish zone into the cavity. The cavity has a cross-sectional shape that imposes a tumbling motion on air flowing from the squish zone into the cavity. Opposing spray patterns of fuel are injected into the combustion chamber. In some aspects, the opposing spray patterns are injected along a major axis of the combustion chamber.

Description

technical field [0001] This field is the combustion chamber for internal combustion engines. In particular, this field includes configurations for opposed-piston engines in which a combustion chamber is defined between oppositely disposed piston end faces in the bore of a ported cylinder. More particularly, the field includes opposed-piston engines having combustion chamber configurations that create a tumble motion in charge air admitted to the cylinder between piston end faces. The opposite spray pattern of fuel is injected into the combustion chamber. In some aspects, opposing spray patterns are injected along the long axis of the combustion chamber. Background technique [0002] According to FIG. 1 , an opposed-piston engine comprises at least one cylinder 10 having a bore 12 machined or formed therein and longitudinally offset intake and exhaust ports 14 and 16 . One or more fuel injectors 17 are fixed at injector ports (where injector ports are ports where injectors...

Claims

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Application Information

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IPC IPC(8): F01B7/02F02B23/06F02B75/28
CPCF01B7/02F01B7/12F02B23/0621F02B23/0624F02B23/0633F02B23/0645F02B23/0651F02B23/0663F02B23/0675F02B23/0678F02B75/04F02B75/282F02B75/32F02B2275/48F02M61/1806F02M61/14Y02T10/12F01B7/08F02B23/063F02B75/28F16C33/04
Inventor K·B·富卡F·G·勒东H·申M·H·瓦尔
Owner ACHATES POWERS INC