Fuel injection method for dual-fuel engine

A dual-fuel engine and fuel injection technology, which is applied in the directions of fuel injection control, engine control, machine/engine, etc., can solve the problems that the power, economy and emission performance of dual-fuel engines cannot be ensured at the same time, and achieve improved economical and Power performance, good combustion and emissions, the effect of improving power performance

Inactive Publication Date: 2017-06-20
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem that the power, economy and emission of the existing dual-fuel engine cannot be guaranteed at the same time, the present invention provides a fuel injection method for the dual-fuel engine

Method used

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  • Fuel injection method for dual-fuel engine
  • Fuel injection method for dual-fuel engine
  • Fuel injection method for dual-fuel engine

Examples

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Embodiment Construction

[0023] Such as figure 1 As shown, in the intake stroke, the intake port in the intake port 1 is injected by the pilot fuel nozzle 2 to inject the pilot fuel 3, and enters the cylinder with the air to form the port injection of a mixture 5 of the pilot fuel and air.

[0024] Such as figure 2 with image 3 As shown, the port injection of the mixture 5 of pilot fuel and air diffuses under the action of the airflow in the cylinder to form a more uniform lean combustible mixture 5a in the cylinder. The pilot fuel nozzle 8 in the cylinder can be exhausted. After the valve is closed, the pilot fuel is injected to the top dead center of the compression stroke, which can form a richer combustible mixture in the upper part of the cylinder close to the fuel injection nozzle 6.

[0025] Such as Figure 4 As shown, at the end of the compression stroke, the fuel injector 6 injects the pilot fuel beam 7 to ignite the combustible mixture near the fuel injector, and the resulting turbulent combusti...

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PUM

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Abstract

The invention provides a fuel injection method for a dual-fuel engine, and belongs to the technical field of combustion of engines. According to the working conditions of the engine, all ignited fuel is injected through an air inlet side cylinder or directly injected through a cylinder cover; or part of the ignited fuel is injected from the air inlet side, and the other part of the ignited fuel is directly injected through the cylinder cover; or the ignited fuel is not injected. The ignited fuel injected from the air inlet side and air form thin premixed gas. The ignited fuel directly injected through the cylinder cover is injected after an exhaust valve is closed and before the fuel is compressed to the upper dead center, or is injected while the fuel is ignited, or is injected at the early stage of the expansion stroke. The ignited fuel and the premixed gas of the ignited fuel in an ignition cylinder are injected near the compression upper dead center. By controlling the ratio of the fuel injected from the air inlet side to the fuel directly injected through the cylinder cover and the injection phase, one of a premixing combustion mode, a premixing / diffusion mixing combustion, and a diffusion combustion mode is adopted by the engine according to different working conditions, and thus on the premise of guaranteeing the power performance, efficient and clean combustion under full working conditions is achieved.

Description

Technical field [0001] The invention relates to a fuel injection method of a dual-fuel engine, belonging to the technical field of engine combustion. Background technique [0002] Due to abundant gas fuel resources, high availability and economy, and good emissions, people are increasingly installing natural gas supply systems on diesel engines to make them dual-fuel engines. This dual-fuel engine uses natural gas as the main fuel and uses a small amount of diesel to ignite the combustible mixture near the compression top dead center. In small operating conditions, the dual-fuel engine only burns diesel. The current dual-fuel engine can only choose one of the premixed combustion mode or the diffusion combustion mode. In order to avoid the occurrence of knocking, the dual-fuel engine adopts the premixed combustion method. The mixture concentration is generally low, and the ignition timing cannot be too early, which leads to the lack of power; The economy is better, but the emis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/30F02D19/08F02D19/10
CPCF02D41/3094F02D19/0639F02D19/0642F02D19/0644F02D19/0647F02D19/0655F02D19/10F02D19/105F02D41/3017F02D41/3035F02D2250/36
Inventor 隆武强田华王洋田江平崔靖晨冯立岩陈雷
Owner DALIAN UNIV OF TECH
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