Diesel oil engine

A diesel engine and pre-injection technology, which is applied in the direction of engine control, combustion engine, machine/engine, etc., can solve the problems such as the inability to form pre-mixed gas, and achieve the effect of simplifying fuel injection control and preventing adhesion

Inactive Publication Date: 2005-05-04
MITSUBISHI MOTORS CORP
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Problems solved by technology

As a result, there is a danger that sufficient premixed gas cannot be formed in the combustion chamber.
In addition, because the fuel only arrives at the cylinder several times, and the total amount of fuel reaching the cylinder remains unchanged, the solution to large-scale cylinder oil flooding will lead to small-scale cylinder oil flooding, which cannot fundamentally prevent the occurrence of cylinder oil flooding

Method used

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  • Diesel oil engine
  • Diesel oil engine
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Examples

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Embodiment Construction

[0038] figure 1 Shown is an overall structure of a diesel engine 1 according to an embodiment of the present invention and a fuel injection device M mounted on a main body 2 of the diesel engine (hereinafter referred to as the engine) 1 .

[0039] The main body 2 of the engine 1 includes: a cylinder block 3 , a cylinder head 4 combined thereon, a cylinder head cover not shown in the figure, an oil pan and the like. The engine 1 is a multi-cylinder engine having a plurality of cylinders of the same structure. However, here, in order to avoid redundant description, one cylinder will be mainly described. Here, in the cylinder block 3 , the internal cylinder 5 is equipped with a piston 6 that can slide up and down, and a combustion chamber 7 with variable volume is formed in the lower space of the cylinder 5 , piston 6 , and cylinder head 4 .

[0040] In the lower part of the cylinder head 4, a fuel injection valve 8 is installed facing the combustion chamber 7, and an intake p...

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Abstract

The diesel engine 1 is provided with a fuel injection device M to conduct main injection Js of high-pressure fuel into the combustion chamber 7 near a compression top dead center, and conduct the preliminary injection Js before the main injection, and a controller 27 to control the fuel injection device M corresponding to the operation condition. The controller 27 controls the injection so as to conduct the preliminary injection before the opening position tintop of a suction valve in a latter part of the exhaust stroke. In the diesel engine in which the preliminary injection is made in an exhaust stroke range without the immediate ignition by obtaining a sufficient premixed time so that premixed combustion is promoted, and main injection fuel is quickly vaporized and burned in a combustion chamber raised in temperature so as to enable both the reductions in a formation amount of NOx and discharge of a smoke (PM).

Description

technical field [0001] The invention relates to a diesel engine with pre-injection before main injection, in particular to a diesel engine capable of reducing black smoke emission while suppressing NOx generation. Background technique [0002] In a diesel engine, in order to reduce NOx contained in exhaust gas and noise during combustion, a conventional method is to delay fuel injection timing. However, if the timing of fuel injection is delayed in this way, the amount of black smoke emission will increase. Therefore, the emission of black smoke is reduced by adopting the method of improving fuel atomization after implementing high-pressure injection. However, in this case, as the combustion temperature rises, the NOx emissions will also increase. [0003] As mentioned above, for diesel engines, the relationship between suppressing the production of NOx and reducing the emission of black smoke is a mutually restrictive relationship, and it is difficult to improve both at t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/38F02D41/04F02D41/40
CPCF02D41/401Y02T10/44F02D41/403F02D2250/36Y02T10/40
Inventor 柳川祐治竹村纯信原惠畠道博仓田和郎
Owner MITSUBISHI MOTORS CORP
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