Fuel injection device for internal combustion engine

Abstract

The present invention prevents the performance of an internal combustion engine from being degraded and prevents soot and dust, and black smoke from increasing due to the reduction of fuel injection pressure and the deterioration of combustibility even when only fuel oil is injected into a cylinder liner. A fuel injection device (1) for an internal combustion engine can selectively inject fuel oil and inert matter in a multilayered state or an emulsified state or only fuel oil from a fuel injection valve (3). A cam (10) which thrusts up a plunger (7) of a fuel injection pump (2) for pressurizing and supplying, to the fuel injection valve (3), the fuel oil and the inert matter in the multilayered state or the emulsified state or the fuel oil is provided with a first cam which is used at the time of thrusting up the fuel oil and the inert matter in the multilayered state or the emulsified state, and a second cam which is used at the time of thrusting up only the fuel oil.

Description

technical field [0001] The present invention relates to a fuel injection device for an internal combustion engine equipped with a plurality of fuel injection valves per cylinder. Background technique [0002] As a fuel injection device for an internal combustion engine equipped with a plurality of fuel injection valves per cylinder, for example, a device disclosed in Patent Document 1 is known. [0003] Patent Document 1: Japanese Patent Application Publication No. 8-11945 [0004] Patent Document 2: Japanese Patent No. 3615260 [0005] The problem to be solved by the invention [0006] In recent years, from the viewpoint of environmental protection, an engine exhaust control area (ECA: Emission Control Area) has been stipulated, and NOx emission is restricted in this environment control area. [0007] In addition, in the sea area where engine exhaust gas is restricted, in the near future, it is planned to further strengthen the restriction of exhaust gas. In order to com...

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Problems solved by technology

[0008] However, as in the technologies disclosed in the above-mentioned Patent Document 1 and Patent Document 2, in a fuel injection valve that injects multi-layered or emulsified fuel composed of fuel oil and water, since the injection amount at one time increases, it is necessary to The diameter of each injection hole is made larger than that of the fuel injection valve that injects only fuel

Therefore, in the technologies disclosed in the above-mentioned Patent Document 1 and Patent Document 2, when going out of the engine exhaust gas restricted sea area from the engine exhaust gas restricted sea area, the fuel injection mode (operating mode) of the main engine and the generator is changed from the injection to the fuel and When the multi-layered or emulsified fuel formed by water is changed to only fuel injection, it may lead to a drop in fuel injection pressure, deterioration of combustibility, and deterioration of internal combustion engine performance, as well as increased smoke and black smoke

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