Control method of combustion system, combustion system and diesel engine

Abstract

The invention relates to the technical field of diesel engines, and particularly discloses a control method of a combustion system, the combustion system and the diesel engine. According to the control method of the combustion system, through two times of main fuel injection, the space intensity of the entrainment effect of oil beams injected twice in a cylinder can be superposed, two times of organization of the oil beams onto a flow field in the cylinder is achieved, and turbulent flow in the cylinder is strengthened. The oil-gas mixing rate in the cylinder is increased, and the combustion speed and the air utilization rate in the cylinder in the middle and later periods of combustion are also effectively increased. By determining the duration of primary main fuel injection and first injection pressure, it is ensured that the cylinder pressure at least can reach the cylinder pressure upper limit threshold value, and during second main fuel injection, the cylinder pressure is reduced from the cylinder pressure upper limit threshold value to the set cylinder pressure within the period of time. The change rate of the curve slope of a cylinder pressure change curve at each time point is within the set slope change rate range, and the rotating angle of a crankshaft is not smaller than a first preset rotating angle, so that the optimal space entrainment superimposed effect is ensured, and the optimal power output of the diesel engine can be guaranteed.

Description

Technical field [0001] The present invention relates to the field of diesel engine, and more particularly to a method of controlling a combustion system and a combustion system and a diesel engine. Background technique [0002] The combustion tissue of existing diesel engines is mainly based on diffusion combustion, and the combustion rate is largely limited by oil and gas mixing speed. In addition, at this stage, high-pressure co-rail diesel engines use primary fuel injection. The sound absurd effect of single high pressure injection is mainly in the atomization area, and the roll of oil in the middle section of the oil bundle is weak, and the hydrocarbon mixing effect is poor, and due to diesel engine speed High, for the four-stroke diesel engine, the time for tissue oil and gas mixing is very short, the jet and droplets generated by single injection after breaking the atomization, it is difficult to form a uniform mixture of uniform mixture in combustion indoor, thereby limiti...

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Problems solved by technology

In addition, the current high-pressure common rail diesel engines all use one main fuel injection, and the entrainment effect of a single high-pressure injection mainly occurs in the atomization area, and the entrainment effect is weakened in the middle of the oil beam, and the oil-gas mixing effect is poor. High, for a four-stroke diesel engine, the time used to organize the mixing of oil and gas is very short. After the jets and droplets produced by a single injection undergo broken atomization, it is difficult to diffuse in the combustion chamber in time to form a uniform mixture with air, thereby limiting combustion. The process proceeds quickly, further limiting the power output of the diesel engine

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