An improvement Of Pumping Loss Of High Boosted Diesel Engines

Endo, Shin; Otani, T.; Kakinai, Akio

doi:10.4271/885102

Cited by 12 publications

(2 citation statements)

References 2 publications

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“…However, the diesel engines are commonly used as power sources for ships, railcars, trucks, buses, passenger cars and other vehicles because they are superior to other engines in terms of fuel economy, durability, and reliability. They have shown improved exhaust emissions and thermal efficiency through high pressure injection [1][2][3][4], high boost with a turbocharging and intercooler [5][6][7][8], and enhanced EGR [9,11]. Their high thermal efficiency can suppress CO 2 emissions and many passenger cars employ diesel engines in Europe.…”

Section: Introductionmentioning

confidence: 99%

Measurement of flame temperature and soot amount for effective NO<sub>x</sub> and PM reduction in a heavy duty diesel engine

Aoyagi¹

2019

Combustion Engines

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To reduce exhaust NOx and smoke, it is important to measure flame temperature and soot amount in combustion chamber. In diesel combustion it is effective to use the two-color method for the measurement of the flame temperature and KL factor, which is related with soot concentration. The diesel flame was directly and continuously observed from the combustion chamber at running engine condition by using a bore scope and a high-speed video camera. The experimental single cylinder engine has 2.0-liter displacement and has the ability with up to five times of the boost pressure than the naturally aspirated engine by external super-charger. The devices of High Boost, Wide Range and High EGR rate at keeping a relatively high excess air ratio were installed in this research engine in order to reduce exhaust NOx emission without smoke deterioration from diesel engines. The video camera nac GX-1 was used in this study. From observed data under the changing EGR rates, the flame temperature and KL factor were obtained by the software of two-color method analysis. The diesel combustion processes are understood well by analyzing high-speed movies of the diesel flame motion and its temperature. The NOx and smoke are mutually related to maximum flame temperature and also it is possible to reduce simultaneously both NOx and soot emissions by high EGR rate in a single cylinder diesel engine.

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Section: Introductionmentioning

confidence: 99%

Measurement of flame temperature and soot amount for effective NO<sub>x</sub> and PM reduction in a heavy duty diesel engine

Aoyagi¹

2019

Combustion Engines

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“…Heavy-duty diesel engines have undergone continuous improvement in fuel consumption and exhaust emissions through combustion modification by means of high-pressure injection [1, 2], air swirl control [3], the adoption of turbo-intercoolers [4–6], and changing the material of the piston from aluminium to iron [7]. For instance Cummins Signature 600 model engine, which was equipped with a turbo-intercooler and a high fuel injection system delivering 193 MPa, showed in 1998 a thermal efficiency of 45.5 per cent [6].…”

Section: Introductionmentioning

confidence: 99%

Improvement of thermal efficiency of a high-boosted diesel engine with focus on peak cylinder pressure

Aoyagi¹,

Yamaguchi²,

Osada³

et al. 2011

International Journal of Engine Research

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The combination of high boosting and high exhaust gas recirculation (EGR) is a practical and effective strategy to achieve simultaneous reductions of fuel consumption and exhaust emissions in diesel engines. To obtain further improvements of fuel efficiency and emissions, the effects of engine parameters including compression ratio, peak cylinder pressure, and the timing of the start of combustion are investigated using a single-cylinder diesel engine under conditions of high boost pressure of 400 kPa and fuel injection pressure of 200 MPa, focusing particularly on the peak cylinder pressure. The experiments show that when the peak cylinder pressure is raised to 28 MPa by adjusting the timing of the start of combustion at 23°after top dead centre (ATDC) at a compression ratio of 18, the lowest specific fuel consumption rate of 185.6 g/kW h, which corresponds to the brake thermal efficiency of 45.2 per cent, is obtained. When the effective compression ratio is lowered by using a variable valve timing system while maintaining the peak cylinder pressure at 28 MPa, the minimum specific fuel consumption of 181.2 g/kW h, which corresponds to a brake thermal efficiency of 46.3 per cent, is obtained.

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Analysis of Variable Valve Timing Events and Their Effects on Single Cylinder Diesel Engine

Parvate-Patil¹,

Hong²,

Gordon³

2004

SAE Technical Paper Series

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An improvement Of Pumping Loss Of High Boosted Diesel Engines

Cited by 12 publications

References 2 publications

Measurement of flame temperature and soot amount for effective NO<sub>x</sub> and PM reduction in a heavy duty diesel engine

Measurement of flame temperature and soot amount for effective NO<sub>x</sub> and PM reduction in a heavy duty diesel engine

Improvement of thermal efficiency of a high-boosted diesel engine with focus on peak cylinder pressure

Analysis of Variable Valve Timing Events and Their Effects on Single Cylinder Diesel Engine

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