Contribution of Cold and Hot Start Transients in Engine-out HC Emissions

Luan, Yunfei; Henein, Naeim A.

doi:10.4271/982645

Cited by 23 publications

(6 citation statements)

References 12 publications

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“…Thus, it can be emitted when the exhaust valves start opening. In the past, the negligible level of particulate matter at the exhaust of PFI SI engines addressed the research activities in other directions and the previous investigations were focused on the fuel deposition as cause of high level of exhaust hydrocarbon emissions during the cold start-up [15][16][17]. Nevertheless, recent experimental studies demonstrated the presence of high number concentration of nanometric carbonaceous particles at the PFI SI exhaust also at low engine speed [18][19][20].…”

Section: Resultsmentioning

confidence: 99%

Optical investigations of fuel deposition burning in ported fuel injection (PFI) spark-ignition (SI) engine

Merola

Vaglieco

2009

Energy

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Section: Resultsmentioning

confidence: 99%

Optical investigations of fuel deposition burning in ported fuel injection (PFI) spark-ignition (SI) engine

Merola

Vaglieco

2009

Energy

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“…IMAP drops rapidly because the throttle valve is closed. In low-temperature conditions, sprayed fuel does not evaporate well (Luan & Henein, 1998). Diesel engines are the most efficient internal combustion engines in terms of fuel.…”

Section: Methodsmentioning

confidence: 99%

Application of Bypass Heater System for Prevention of Overcooling in Diesel Engines

Darmansyah

Khalid

Kasim

et al. 2023

JSA

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Industrial and agency activities are currently strongly influenced by electricity supply from PLN. When the PLN electricity goes out, the generator will immediately turn on and all loads previously electrified by PLN power will move to the generator. This displacement occurs quickly and not gradually. Diesel engines (engines) will receive high loads when conditions are still not hot. Diesel engines take longer to heat compared to gasoline engines. This condition is referred to as overcooling. This study uses a bypass heater system to accelerate the heating process and prevent overcooling. From experiments that have been conducted show that the use of a heater as 3000 W for generators with a size of 400 kVa can reduce the heating period by 17 minutes (54%). In addition, it can reduce fuel consumption by an average of 0.5 lt/h during the heating period

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“…To start the engine properly, more fuel than the required stoichiometric mixture is injected according to the calibrated fuel injection strategy on the basis of the fuel evaporation properties, the IMAP and the coolant temperature. Luan and Henein 3 found that the dramatic drop in the IMAP led to incomplete combustion normally from the fourth cycle to the seventh cycle during the engine start processes. It was believed that a lower IMAP increased the in-cylinder residual fraction.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the cold-start engine performance at a low temperature for an engine fuelled with alternative fuel

Xiao

Wang

Song³

et al. 2013

Proceedings of the Institution of Mechanical Engineers, Part D:

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With the stringent emissions regulations for spark ignition engines, attention has always been paid to the cold-start emissions of hydrocarbons and carbon monoxide. The engine speed is an external parameter that can reflect the combustion quality. In this paper, a four-cylinder spark ignition engine fuelled with gasoline and methanol-gasoline blends with methanol fractions of 10%, 30% and 85% is studied; the cold-start transient performances are investigated at ambient temperature of 15°C, -7°C, -15°C and -25°C respectively. The engine speed curves indicate the existence of misfire cycles and incomplete combustion cycles, which are proved by the measured in-cylinder temperatures and the data on the indicated mean effective pressure. The experimental results show that the addition of methanol increases the starting time at low temperatures, which improves the combustion, however. The engine started successfully for all the blending ratios and ambient temperatures except for the 85% methanol-gasoline blend at -25°C. During the cold-start process, the peak speed and the transient period increase with increasing methanol fraction, while the speed fluctuations decrease. Thus the addition of methanol improves the cold-start performance of the engine.

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Contribution of Cold and Hot Start Transients in Engine-out HC Emissions

Cited by 23 publications

References 12 publications

Optical investigations of fuel deposition burning in ported fuel injection (PFI) spark-ignition (SI) engine

Optical investigations of fuel deposition burning in ported fuel injection (PFI) spark-ignition (SI) engine

Application of Bypass Heater System for Prevention of Overcooling in Diesel Engines

Investigation of the cold-start engine performance at a low temperature for an engine fuelled with alternative fuel

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