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Control method for an internal combustion engine and internal combustion engine

一种内燃发动机、发动机的技术，应用在发动机控制、内燃活塞发动机、燃烧发动机等方向，能够解决高烟排放、米勒循环增加NOx排放等问题，达到低烟排放的效果

Active Publication Date: 2013-08-07
WARTSILA FINLAND OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, at part load and low load, the use of the Miller cycle increases NOx emissions
At the same time, the optimal Miller cycle for NOx emissions leads to higher smoke emissions

Method used

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  • Control method for an internal combustion engine and internal combustion engine
  • Control method for an internal combustion engine and internal combustion engine
  • Control method for an internal combustion engine and internal combustion engine

Examples

Experimental program
Comparison scheme
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Embodiment approach

[0030] According to a second embodiment of the invention, the method includes a third mode of operation, which is used at part load, as shown in Table 2. In the embodiment of Table 2, said third mode of operation is used when the load is 35-50% of the maximum load. Thus, the first mode of operation is used at 50-100% of the maximum load, ie at loads from medium to high loads.

[0031] Table 2. Control strategy according to a second embodiment of the invention.

[0032]

[0033] In the third mode of operation, the Miller cycle is not used. Instead, conventional intake valve closing timing is used to achieve low smoke emissions. Fuel is injected into the cylinder block 1 of the engine by using the first nozzle 9a.

[0034] According to a third embodiment of the invention, the method includes a fourth mode of operation, which is used at low loads, as shown in Table 3. In the embodiment of Table 3, the fourth mode of operation is used at a load of 15-35% of the maximum load...

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PUM

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Abstract

The method for controlling the operation of an internal combustion engine comprises at least two operating modes. In a first operating mode, the intake valve (3) is closed at a first predetermined crank angle, in accordance with the Miller cycle, before the piston (2) reaches bottom dead center during the intake stroke for reducing pressure in the cylinder (1), and fuel is injected using first fuel injection means (9a) optimized for large amounts of fuel. In a second operating mode the intake valve (3) is closed at a second predetermined crank angle, in accordance with conventional intake valve closing timing, after or slightly before the piston (2) has passed bottom dead center, and fuel is injected using second fuel injection means (9b) optimized for small amounts of fuel. The invention also concerns an internal combustion engine.

Description

technical field [0001] The invention relates to a method for controlling the operation of an internal combustion engine according to the preamble of claim 1 . The invention also relates to an internal combustion engine as defined in the preamble of claim 13 . Background technique [0002] Smoke generation at low loads is a common problem in large compression-ignition internal combustion engines, such as those used in ships or power plants. The engine's fuel injectors must be able to deliver the amount of fuel required to operate at maximum load. Since large internal combustion engines need to operate reliably and efficiently at or near maximum power, the injectors are very optimized for high loads. This means that at low loads the injector does not work optimally and smoke forms. [0003] This problem has been solved in prior art solutions by using injectors with two needles. For example, in European patent application EP0972932A1 a fuel injector is disclosed which compr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M45/08F02D41/00F02D41/30F02D13/02F02D41/40
CPCF02M45/086F02D13/02F02D41/40Y02T10/42F02D41/3094Y02T10/44Y02T10/18Y02T10/142F02M2200/44F02D41/3017F02D41/32F02D41/0002Y02T10/12Y02T10/40F02D13/0234F02D13/0269F02D41/30F02M45/08
Inventor M·特洛伯格L·祖安尼基A·温特史黛勒克里斯·哈塔尔G·里兹托D·德尔内力
Owner WARTSILA FINLAND OY
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