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Combustion system control method, combustion system and diesel engine

A combustion system and control method technology, applied in fuel injection control, electrical control, engine control, etc., can solve the problems of limited diesel engine power output, poor oil-gas mixing effect, weakened entrainment effect, etc., to improve combustion speed and in-cylinder Optimum effects of air utilization, rate increase, and power output

Active Publication Date: 2021-09-17
WEICHAI POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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  • Combustion system control method, combustion system and diesel engine
  • Combustion system control method, combustion system and diesel engine
  • Combustion system control method, combustion system and diesel engine

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Embodiment 1

[0052] This embodiment provides a combustion control system. The combustion control system includes a piston, a fuel injector and a cylinder, wherein the piston can reciprocate up and down in the cylinder, and the fuel injector is used to inject fuel into the combustion chamber provided on the piston. The combustion control system further includes a controller, the controller is used to control the injector to perform at least the first main fuel injection and the second main fuel injection in sequence in each movement cycle of the piston, and the injector performs between the first main fuel injection and the second main fuel injection. Continuous fuel injection during the second main fuel injection, and the rate of the fuel injected when the injector performs the first main fuel injection and when the injector performs the second main fuel injection is not less than the set value. The rate of fuel injected between a main fuel injection and a second main fuel injection is less...

Embodiment 2

[0056] This embodiment provides a diesel engine, which includes the combustion system in Embodiment 1. And the diesel engine has the beneficial effect of the combustion system in the first embodiment.

Embodiment 3

[0058] This embodiment provides a method for controlling a combustion system, which can be implemented by the combustion system in Embodiment 1. The control methods of the combustion system include:

[0059] S100: Determine the duration of the first main fuel injection and the first injection pressure, so that the cylinder pressure at least part of the time during the first main fuel injection can reach the cylinder pressure upper threshold.

[0060] S200: Iteratively adjust at least one of the duration of the second main fuel injection and the second injection pressure, so that during the second main fuel injection, the cylinder pressure drops from the cylinder pressure upper limit threshold to the set cylinder pressure for a period of time The change rate of the slope of the cylinder pressure change curve at each time point is within the range of the set slope change rate, and the corresponding crankshaft turns during the time period when the cylinder pressure drops from the...

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Abstract

The invention relates to the technical field of diesel engines, and specifically discloses a combustion system control method, a combustion system and a diesel engine. The combustion system control method can make the twice-injected oil beams entrain in the cylinder through two main fuel injections. The superposition of space intensity realizes the two-time organization of the oil beam to the flow field in the cylinder, strengthens the turbulent flow in the cylinder, improves the mixing rate of oil and gas in the cylinder, and effectively improves the combustion speed and air utilization in the cylinder in the middle and late stages of combustion; and by determining the first The duration of the main fuel injection and the first injection pressure ensure that the cylinder pressure can at least reach the upper threshold of the cylinder pressure. During the second main fuel injection, the cylinder pressure drops from the upper threshold of the cylinder pressure to the set cylinder pressure. The change rate of the slope of the pressure change curve at each time point is within the range of the set slope change rate, and the angle of the crankshaft rotation is not less than the first preset rotation angle, which can ensure the optimal space entrainment superposition effect and ensure that the diesel engine Optimal power output.

Description

technical field [0001] The invention relates to the technical field of diesel engines, in particular to a method for controlling a combustion system, a combustion system and a diesel engine. Background technique [0002] The combustion organization of existing diesel engines is mainly based on diffusion combustion, and the combustion speed is largely limited by the mixing speed of oil and gas. 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 wi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D41/40F02D41/38F02D41/14
CPCF02D41/402F02D41/3827F02D41/3836F02D41/1406
Inventor 谭旭光周鹏佟德辉庞斌谷允成刘晓鑫
Owner WEICHAI POWER CO LTD
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