Experimental investigation of the air–fuel charging process in a four-valve supercharged two-stroke cycle GDI engine

Nora, Macklini Dalla; Martins, Mario; Machado, Paulo Romeu Moreira; Zhao, Hua

doi:10.1007/s40430-019-1638-6

Cited by 7 publications

(5 citation statements)

References 48 publications

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“…Many of the drawbacks have been improved in modern 2-stroke engines with technology such as adjusting charging timing to decrease the amount of short, circuited gas [7], electronically controlled direct injection, and variable compression ratio to maximize the fuel efficiency of 2-stroke engines [8,9] and to meet the increasingly stringent emission regulation. However, there is still room for improvement.…”

Section: Sustainable Development Of the 2-stroke Enginementioning

confidence: 99%

Research Progress of Two-Stroke Internal Combustion

Mao

2024

HSET

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In a world that is gradually moving towards renewable sources of energy, the 2-stroke motor with it is low efficiency and high emission is being phased out. However, there are some applications which require the unique characteristics of the 2-stroke motor, making it the only suitable form of power for those applications. This paper will discuss the operating principle of the 2-stroke motor, how its construction is able to be simplistic and light, and how it has a high power-to-weight ratio. This paper will also discuss the relatively inefficient scavenging process caused by the simplistic nature of the 2-stroke engine, leading to high emission, low efficiency, short engine life, and noise. To solve these problems, mechanical solutions such as electronically controlled direct injection, delayed charging, and variable compression have been developed and are now common, while recent research into the use of bioethanol and hydrogen as fuel can further decrease emissions and increase efficiency. Therefore, the purpose of this paper is to summarize past and recent research regarding the strengths and limitations of 2-stroke internal combustion engines and the future developmental direction of 2-stroke engines in alternative fuel.

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Section: Sustainable Development Of the 2-stroke Enginementioning

confidence: 99%

Research Progress of Two-Stroke Internal Combustion

Mao

2024

HSET

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“…The assembly of the injector on the cylinder head, mainly its inclination, is tted considering the reduction of the fuel short-circuit, a good air-fuel homogenization and a minimal fuel impingement on the piston top. Very interesting studies about the importance of the position of the injector can be seen in [18]; [19]; [20].…”

Section: Fuel Feeder System 221 Cylinder Head With Built-in Injectormentioning

confidence: 99%

Low-pressure gasoline direct injection system development and emissions analysis for a reciprocating two-stroke engine

Gutiérrez,

Sala,

Delpeuch

2023

Preprint

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This study presents the design and construction of an electronic low-pressure gasoline direct injection system for two-stroke engines, with the objective to study engine performance and the emission of exhaust polluting gases, maintaining the expectations of this type of engine. The investigation includes a test bench with an incorporated engine and the required control devices for this, as well as a gas analyzer Class 0, a Computerized Data Acquisition and several tools for displaying and process all the electronic signals from the engine in real time. In order to manage this system, a custom electronic injection control unit has been designed and built, which allows control the fuel injection timing and duration. This unit uses the signal from an inductive sensor installed in the crankshaft as a reference and synchronization point. Additionally, modifications have been made to the fuel feeder circuit and the electronic of the test engine, as well as to some parts of the mechanism in order to adapt them to this technology. The implementation of the engine tests is described, and the performance and operational points of the original system and those of the new injection system are evaluated.

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“…Turbocharging and internal combustion engine downsizing are two effective approaches for increasing gasoline engine efficiency. [2][3][4][5][6] The most prominent advantage of the combination of in-cylinder direct injection technology and supercharged downsizing technology is that the direct injection gasoline engine can produce a large torque at low speeds and can maintain a relatively large torque output at a wide range of speeds. A compact strengthened gasoline engine increases the heat load on the cylinder, making it more likely to knock.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation research on the influence of the parameters of water injection on the GDI engine

Zhang

Zheng

2022

International Journal of Engine Research

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The small enhanced technology that synergizes in-cylinder direct injection and turbocharging has good power and fuel economy, and has become a trend in the development of gasoline direct injection engines. However, the enhanced technology has sharply increased the thermal load in the cylinder. It is easy to cause engine knocks, which is currently one of the main limiting factors in improving the performance of direct injection gasoline engines. This paper discusses the influence of direct injection of water into the cylinder on the combustion of gasoline direct injection engines through numerical simulation. The gasoline engine is induced to knock by increasing the compression ratio and advancing the ignition timing. The influence of the water injector (six nozzle holes) layouts (direct water injection in the cylinder) and the water temperatures on the water movement in the cylinder and on the combustion and knock is explored. The in-cylinder water injector and the fuel injector are injected with two nozzles. Results show that when the water injector is arranged in the center of the cylinder head, the water evaporation in the cylinder before ignition is faster. Most of the water is located near the cylinder wall surface, which can reduce the temperature near the wall surface as much as possible and suppress the knock. Therefore, the effect of suppressing knocks is better. The injecting water is advantageous to make the mixed gas distribution uniform and the turbulent kinetic energy high when its temperature is low.

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Experimental investigation of the air–fuel charging process in a four-valve supercharged two-stroke cycle GDI engine

Cited by 7 publications

References 48 publications

Research Progress of Two-Stroke Internal Combustion

Research Progress of Two-Stroke Internal Combustion

Low-pressure gasoline direct injection system development and emissions analysis for a reciprocating two-stroke engine

Numerical simulation research on the influence of the parameters of water injection on the GDI engine

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