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Dual-fuel compression ignition type four-stroke engine and combustion control method

A four-stroke engine and dual-fuel technology, which is applied in engine control, combustion engine, internal combustion piston engine, etc., can solve the problems of difficult reliable control, small working range, and limitation of engine performance improvement, so as to achieve efficient and clean combustion and optimize energy structure effect

Inactive Publication Date: 2020-02-21
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ignition timing of premixed compression ignition is affected by environmental conditions and engine operating conditions, so it is difficult to control reliably
In addition, its operating range is small, cold start and low load will produce too much HC and CO, and high load will cause knocking
[0003] It is difficult for a single-fuel engine to meet the needs of energy diversification, and the combustion characteristics of a single fuel are limited, which limits the performance improvement of the engine

Method used

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  • Dual-fuel compression ignition type four-stroke engine and combustion control method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1, such as figure 1 As shown, the engine includes an intake port 1, an exhaust port 2 and a combustion chamber 3, and the first fuel nozzle 5 for in-cylinder direct injection is set on the cylinder head and / or the first fuel nozzle 4 for the intake port is set on the intake port , the second in-cylinder direct injection fuel nozzle 6 is set on the cylinder head; the ignition mode of the engine is to trigger the fuel combustion in the cylinder by the jet flow of the in-cylinder direct injection second fuel nozzle 6 .

[0030] The bottom of the cylinder head, the bottom of the valve, the top surface of the piston and the fire bank, and the upper part of the cylinder liner that the piston ring cannot touch are sprayed with a heat-insulating coating and / or the piston is made of ceramic materials to reduce heat transfer loss in the cylinder and improve the thermal efficiency of the engine; The direct-injection fuel nozzle adopts a high-disturbance nozzle to enhance t...

Embodiment 2

[0037] Embodiment 2 is different from Embodiment 1 in that the main fuel nozzle 4 in the intake port is reduced, and by changing the injection timing and injection times of the in-cylinder direct injection main fuel nozzle 5 and other strategies, it is mixed with reformed gas for combustion to achieve high efficiency and cleanliness. Combustion in different working conditions.

Embodiment 3

[0038] Embodiment 3 is different from Embodiment 1 in that the in-cylinder direct injection main fuel nozzle 5 is reduced, and the main fuel is injected through the intake port main fuel nozzle 4 and mixed with reformed gas for combustion to achieve efficient and clean combustion.

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Abstract

The invention provides a dual-fuel compression ignition type four-stroke engine and a combustion control method, and belongs to the field of internal combustion engine combustion. A cylinder cover isprovided with an in-cylinder direct-injection first fuel nozzle and / or a gas inlet channel is provided with a gas inlet channel first fuel nozzle, and the cylinder cover is provided with an in-cylinder direct-injection second fuel nozzle. In the state that all kinds of the nozzles are arranged, when the engine is in low load, first fuel and second fuel are supplied by the in-cylinder direct-injection nozzles, and the heat efficiency is improved; when the engine is in middle load, the fuel is supplied by the gas inlet channel first fuel nozzle and the in-cylinder direct-injection second fuel nozzle, and generation of NOx is reduced; and when the engine is in high load, fuel supplying is conducted through all the nozzles of the first fuel and the second fuel, and knocking is controlled. Efficient and clean combustion in all working condition ranges is achieved, and the energy structure is optimized.

Description

technical field [0001] The invention relates to a dual-fuel compression-ignition four-stroke engine and a combustion control method, belonging to the field of combustion of internal combustion engines. Background technique [0002] Energy and environmental issues are becoming more and more prominent. The low-temperature combustion of premixed compression ignition can improve the thermal efficiency of the engine and reduce NOx emissions. However, the ignition timing of premixed compression ignition is affected by environmental conditions and engine operating conditions, so it is difficult to control reliably. In addition, its operating range is small, cold start and low load will produce too much HC and CO, and high load will cause knocking. [0003] It is difficult for a single-fuel engine to meet the needs of energy diversification, and the combustion characteristics of a single fuel are limited, which limits the performance improvement of the engine. Contents of the inv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02B69/04F02D19/08F02F1/00F02F1/24F02M39/00
CPCF02B69/04F02B2075/027F02D19/08F02F1/004F02F1/242F02M39/00
Inventor 隆武强崔靖晨田华王洋张恒曹建林
Owner DALIAN UNIV OF TECH