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Vibration reduction in large diesel engines

An engine, piston engine technology, applied in the direction of engine control, combustion engine, machine/engine, etc., can solve problems such as discomfort of crew and passengers

Active Publication Date: 2007-06-06
MAN DIESEL & TURBO FILIAL AF MAN DIESEL & TURBO SE TYSKLAND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] On board, vibrations from the engine are not limited to the engine itself as well as the drive shaft, but the vibrations are also transmitted to other parts of the hull which can feel the vibrations as well, or the vibrations can produce audible noises which can be disturbing to the crew and / or passengers unwell

Method used

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  • Vibration reduction in large diesel engines
  • Vibration reduction in large diesel engines
  • Vibration reduction in large diesel engines

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Embodiment Construction

[0020] The invention has been described with reference to its embodiments in which a crosshead large piston engine, in particular a two-stroke engine, is mounted on a boat driven by the engine. The present invention can also be applied to other occasions.

[0021] In FIG. 1 , a crosshead large piston engine 10 , in particular a two-stroke engine, is mounted on a ship 11 , which is only schematically represented. The engine 10 has an engine output shaft 12 which drives a load, for example a propeller 14 driven via a drive shaft 13 , and / or an electrical generator if required. The output shaft 12 and the transmission shaft 13 are supported by a shaft support 15 . Engine 10 is preferably an electronically controlled engine, a number of operating parameters of which can be controlled electronically.

[0022] In FIG. 3 there is shown an engine 10 with a main or output shaft 12 and a cylinder 16 with a piston 17 for driving the main shaft 12 . The fuel system includes a fuel pump...

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Abstract

The method comprises controlling the fuel injection system and / or the exhaust system to control the cylinder pressure at predetermined frequencies. In particular the method comprises controlling the fuel injection system to initiate fuel injection by gradually increasing the fuel injection rate. The pressure is calculated or measured, and a frequency analysis such as an FFT analysis can be performed to determine the pressure component at each frequency. A mathematical model is used to determine the resulting vibration at each frequency. By proper control of the fuel injection, and in particular the initial phase thereof, a smoother pressure curve with less high-frequency content and / or reduced maximum pressure can be achieved. It is thereby possible to control the frequency content of the cylinder pressure, and predetermined frequencies can be suppressed.

Description

technical field [0001] This invention relates to the operation of large piston engines of the crosshead type, especially two-stroke engines. Background technique [0002] Large crosshead piston engines are used, for example, to drive ocean-going ships. Optimizing each of the engine's many processes in such an engine to obtain the best overall operating conditions and performance characteristics of the engine is of considerable importance. Optimum operating conditions for an engine may vary with local or national requirements or may depend on standards established by the owner or operator of the vessel. National requirements may be aimed at protecting the local environment and may set limits on harmful and toxic substances emitted from engines, especially NOx and particles. This mode of operation may not be the most economical mode in terms of fuel consumption. Outside the confines of countries where there are no or few strict restrictions on emissions, the owner or operat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/14F02D35/02F02D41/30F02D41/38F02D41/40F16F15/02
CPCF02D41/403F02D2250/28F02D41/3836F02D2041/288Y02T10/44F02D41/1498F02D35/023F02D41/401Y02T10/40F02D35/02F02D41/14F16F15/02
Inventor K·延森P·伦达尔M·普里姆
Owner MAN DIESEL & TURBO FILIAL AF MAN DIESEL & TURBO SE TYSKLAND
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