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Dual-fuel pressure combustion type four-stroke engine based on reformed gas and combustion control method

A four-stroke engine and control method technology, applied in engine control, combustion engine, internal combustion piston engine, etc., can solve problems such as difficult reliable control, small working range, and difficulty in meeting the needs of diversified energy sources, and achieve high efficiency and cleanliness Combustion, the effect of optimizing the energy structure

Active 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
[0004] 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 pressure combustion type four-stroke engine based on reformed gas and combustion control method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 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 a first fuel nozzle 6 for in-cylinder direct injection is arranged on the cylinder head and / or an intake air is arranged on the intake port 1. The first fuel nozzle 5 is installed on the cylinder head, and the second fuel nozzle 7 for in-cylinder direct injection is arranged on the cylinder head. The in-cylinder direct injection reformed gas nozzle 8 is arranged on the cylinder head and / or the intake air Road reformed gas nozzle 4. The ignition mode of the engine is to trigger the fuel combustion in the cylinder by the injection flow of the second fuel nozzle 7 directly injected into the cylinder.

[0031] 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 ...

Embodiment 2

[0039] Embodiment 2 is different from Embodiment 1 in that the number of first fuel nozzles 5 in the intake port is reduced, and by changing the injection timing and injection times of the first fuel nozzle 6 for in-cylinder direct injection, it is mixed with the reformed gas to achieve high efficiency. Clean split combustion.

Embodiment 3

[0040] Embodiment 3 is different from Embodiment 1 in that the first fuel nozzle 6 for in-cylinder direct injection is reduced, and the first fuel is injected through the first fuel nozzle 5 in the intake port, and mixed with reformed gas for combustion to achieve efficient and clean combustion.

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Abstract

The invention provides a dual-fuel pressure combustion type four-stroke engine based on reformed gas and a combustion control method, and belongs to the field of combustion in an internal combustion engine. A direct-injection first fuel spray nozzle is arranged on a cylinder cover and / or a gas inlet channel first fuel spray nozzle is arranged on a gas inlet channel, a direct-injection second fuelspray nozzle is arranged on the cylinder cover, and a direct-injection reformed gas spray nozzle is arranged on the cylinder cover and / or a gas inlet channel reformed gas spray nozzle are / is arrangedon the gas inlet channel. In the state that all categories of spray nozzles are arranged, first fuel and second fuel are supplied through the direct-injection spray nozzles at low load, and heat efficiency is increased; the fuel is supplied through the gas inlet channel first fuel spray nozzle and the direct-injection second fuel spray nozzle at middle load, and production of NOx is reduced; all spray nozzles of the first fuel and the second fuel all perform fuel supply at high load, and detonation is controlled. Efficient clean combustion in all work condition ranges is realized, and the energy structure is optimized.

Description

technical field [0001] The invention relates to a reformed gas-based dual-fuel compression ignition four-stroke engine and a combustion control method, belonging to the field of internal combustion engine combustion. Background technique [0002] The application of hydrogen doping on the engine can improve the performance and emission of the engine, mainly because its combustion flame spreads fast, promotes the full combustion of fuel, improves thermal efficiency, reduces unburned products, and has a low ignition temperature, which can improve the cold start of the engine. However, the production cost and storage of hydrogen are currently a difficulty for engines. [0003] 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 condit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02B69/04F02D19/08F02M39/00F02F1/24F02F1/00
CPCF02B69/04F02D19/08F02M39/00F02F1/242F02F1/004
Inventor 隆武强田华崔靖晨王洋曹建林张恒
Owner DALIAN UNIV OF TECH
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