Effective release energy, residual gas, and engine emission characteristics of a V-twin engine with various exhaust valve closing timings

2022

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Efficiency and emission reduction are the primary targets of internal combustion engine research due the large number of vehicles in operation and the impact of emissions-related pollution on human and ecosystem health. Harmful components of engine exhaust gases include nitrous oxides (NOx), carbon dioxide, hydrocarbons, and particulate matter. NOx emissions in particular are associated with significant health threats. The recirculation of exhaust gases can reduce NOx emissions and improve engine efficiency when combined with other advanced techniques. On the other hand, the residual exhaust gas also effects on the quality of lubricating engine oil and therefore causes an increase in engine piston ring wear. In this review paper, the effects of external and internal exhaust gas recirculation on the performance and emission characteristics of diesel, gasoline, and alternative fuel engines are summarized and discussed in detail. Because it is difficult to estimate the internal residual exhaust gas in the combustion engine by doing experiments. This review paper introduces control strategies and prediction methods for internal and external exhaust gas recirculation.

Section: Control Strategies and Prediction Of Iegr Methodsmentioning

confidence: 99%

A Review of the External and Internal Residual Exhaust Gas in the Internal Combustion Engine

2022

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“…Then, the model was used to investigate other characteristics of the engine in different modes for each type of diesel fuel and biodiesel blend. AVL-boost software is effective and useful software that is used to simulate most types of engine [15][16][17][18]; in this research, a common rail single cylinder engine is simulated based on the AVL-boost software. Table 1 presents the test engine's specifications; the simulation model is shown in Figure 1.…”

Section: Researching Methodsmentioning

confidence: 99%

A Study the Effect of Biodiesel Blends and the Injection Timing on Performance and Emissions of Common Rail Diesel Engines

Nghia

Cho³

2021

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This paper presents a study on the effect of the ratio of biodiesel and injection timing on the performance of diesel engines and their emissions. The research engine is a cylinder engine AVL-5402, simulated by software AVL-Boost. The simulated fuel includes fossil diesel and biodiesel blended with a replacement rate from 0% to 50%, with a simulation mode of 2200 (rev/min), at a rate of a 25%, 50% and 75% load. In this speed range, the engine has the lowest fuel consumption. The parameters to be evaluated are power, fuel consumption and emissions, based on the proportions of blended biodiesel. The results show that there is a relationship between the proportion of blended biodiesel, injection timing and the parameters of the engine. Specifically, the ratio of the biodiesel blend increases, injection timing tends to move closer to the top dead center (TDC), the tendency reduce engine power, fuel consumption increases, the emissions of CO and soot reduces, while NOx increases.

“…The exhaust valves and intake valve were controlled by two different camshafts. Figure 1 and Figure 2 show the experimental setup schematics [13] and experimental engine setup system [14]. The experiment was conducted with engine speed band of 2000-8000 rpm, 11.8:1 is the compression ratio of the engine, and the air/fuel ratio was kept at 13.6 and 29.5-30 °C of the temperature of intake air during experiments.…”

Section: Experiments Setupmentioning

confidence: 99%

“…The sensors (12) and (13) were used to determine the exhaust gas temperature and oxygen in the exhaust gas. The cylinder pressure sensor Kistler 6056A (14) was located on the engine's head. The air cleaner box (15) and throttle (16), an air-heater (17) was used to remain temperature of air flow from 29.5-30 °C .…”

Section: Experiments Setupmentioning

confidence: 99%

“…It helps researchers simulate various combustion engine types, such as SI engines [13,14], compression ignition (CI) engines [15,16], diesel engines with turbocharger [17,18], and engines using alternative fuel [19]. Figure 3 shows our simulated model of the spark-ignition engine [14]. The steady state or transient state of the testing engine condition is selected in the element E1.…”

Section: Simulation Model Setupmentioning

confidence: 99%

See 1 more Smart Citation

Comparative Study of the Effective Release Energy, Residual Gas Fraction, and Emission Characteristics with Various Valve Port Diameter-Bore Ratios (VPD/B) of a Four-Stroke Spark Ignition Engine

2020

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In this research, the residual gas, peak firing pressure increase, and effective release energy were completely investigated. To obtain this target, the experimental system is installed with a dynamo system and a simulation model was setup. Through combined experimental and simulation methods, the drawbacks of the hardware optimization method were eliminated. The results of the research show that the valve port diameter-bore ratio (VPD/B) has a significant effect on the residual gas, peak firing pressure increase, and effective release energy of a four-stroke spark ignition engine. In this research, the engine was performed at 3000 rpm and full load condition. Following increased IPD/B ratio of 0.3–0.5. The intake port and exhaust port diameter has a contrary effect on engine volumetric efficiency, the residual gas ratio increase 27.3% with larger intake port and decrease 18.6% with larger exhaust port. The engine will perform optimal thermal efficiency when the trapped residual gas fraction ratio is from 13% to 14%. The maximum effective release energy was 0.45 kJ at 0.4 intake port-bore ratio, and 0.451 kJ at 0.35 exhaust port-bore ratio. The NOx emission increases until achieved a maximum value after that decrease even VPD/B was still increasing. With a VPD/B ratio of 0.35 to 0.4, the engine works without the misfiring.