Two stroke opposed-piston engines with compression release for engine braking

A technology of opposed pistons and compression strokes, which is applied to reciprocating piston engines, engine control, engine components, etc., and can solve the problems that opposed piston engines cannot include compression release schemes, etc.

Active Publication Date: 2013-09-18
ACHATES POWERS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, an opposed-piston engine cannot include a compression-release scheme tailored for a valved diesel engine without a cylinder head and intake and exhaust valves

Method used

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  • Two stroke opposed-piston engines with compression release for engine braking
  • Two stroke opposed-piston engines with compression release for engine braking
  • Two stroke opposed-piston engines with compression release for engine braking

Examples

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Embodiment Construction

[0019] The principles of compression release engine braking set forth in this specification are presented in an explanatory context. This background includes a valved two-stroke engine having at least one cylinder with a bore in which a pair of pistons are arranged with their end surfaces facing / opposite. This background is intended to provide a basis for understanding various embodiments of compression release engine braking through an illustrative opposed-piston structure example. This structure can be applied to opposed-piston engines comprising one crankshaft or two crankshafts and to opposed-piston engines comprising three or more crankshafts. On the other hand, any solution can be applied to the structure for piston connection in an opposed-piston engine. In other respects, the structure may be applied to an internal combustion engine comprising one or more valved cylinders each having a bore, piston-controlled exhaust and intake ports and opposing arrangements between ...

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PUM

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Abstract

In a two-stroke opposed-piston engine, a ported cylinder with a pair of opposed pistons is equipped with a decompression port including a valve and a passage with an opening through the cylinder wall that is located between the cylinder's intake and exhaust ports. The decompression port enables the release of compressed air from the cylinder after the intake and exhaust ports are closed. The valve controls airflow through the passage, and is opened to permit compressed air to be released from the cylinder through the passage, and closed to retain compressed air in the cylinder. Engine braking is supported by release of compressed air through the decompression port into an exhaust channel when the pistons are at or near top dead center positions as the cycle transitions from the intake / compression stroke to the power / exhaust stroke. Compression release from the cylinder via the decompression port after intake and exhaust, port closure can also support other engine operations.

Description

technical field [0001] The field relates to internal combustion engines. In particular, the field relates to two-stroke engines having ported cylinders. In more specific applications, the field relates to structures and methods for releasing compressed air from valved cylinders fitted with opposed pistons to enable engine braking, and / or other operations. Background technique [0002] Compared with four-stroke engines, valved two-stroke opposed-piston engines have recognized advantages in specific output, power density, and power-to-weight ratio. For these and other reasons, after nearly a century of limited use, increasing attention has been paid to the widespread application of opposed-piston engines in modern transportation. A representative opposed-piston engine is shown in Figures 1 and 2. As shown in FIG. 1 , the opposed-piston engine includes one or more cylinders 10 each having a bore 12 and longitudinally arranged exhaust and intake ports 14 and 16 machined or f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01B7/14F02B21/00F02B25/08F02B75/28F02D13/02F02D13/04
CPCF01B7/14F02B21/00F02B25/08F02B29/0406F02B75/28F02D13/0276F02D13/04F02M26/05F01L13/065
Inventor J·U·莱姆基F·G·勒东G·雷格纳
Owner ACHATES POWERS INC
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