Challenge to Super High Thermal Efficiency of Diesel Engine

Aoyagi, Yoshinobu

doi:10.1299/jsmemag.105.1007_667

Cited by 5 publications

(2 citation statements)

References 8 publications

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“…Further improvements of fuel consumption and exhaust emissions, by means of both high-pressure boosting equipped with inter-cooler and highpressure fuel injection, have been pursued by Aoyagi [8,9]and Knecht [10,11]. Although the after-treatment system is indispensable for meeting the current emissions standards [10][11][12], it is still essential to minimize the engine-out emissions.…”

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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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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“…Those improvements have earned a worldwide reputation for diesel engines as the prime movers of low CO 2 emission (5) . However, reduction of exhaust emissions such as NOx and PM is required * Received 1st February, 2005 (No.…”

Section: Introductionmentioning

confidence: 99%

Diesel Combustion and Emission Using High Boost and High Injection Pressure in a Single Cylinder Engine(Effects of Boost Pressure and Timing Retardation on Thermal Efficiency and Exhaust Emissions)

Aoyagi

Kunishima

Asaumi

et al. 2005

JSME international journal. Ser. B, Fluids and thermal engineer

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Heavy-duty diesel engines have adopted numerous technologies for clean emissions and low fuel consumption. Some are direct fuel injection combined with high injection pressure and adequate in-cylinder air motion, turbo-intercooler systems, and strong steel pistons. Using these technologies, diesel engines have achieved an extremely low CO 2 emission as a prime mover. However, heavy-duty diesel engines with even lower NOx and PM emission levels are anticipated. This study achieved high-boost and lean diesel combustion using a single cylinder engine that provides good engine performance and clean exhaust emission. The experiment was done under conditions of intake air quantity up to five times that of a naturally aspirated (NA) engine and 200 MPa injection pressure. The adopted pressure booster is an external supercharger that can control intake air temperature. In this engine, the maximum cylinder pressure was increased and new technologies were adopted, including a monotherm piston for endurance of P max = 30 MPa. Moreover, every engine part is newly designed. As the boost pressure increases, the rate of heat release resembles the injection rate and becomes sharper. The combustion and brake thermal efficiency are improved. This high boost and lean diesel combustion creates little smoke; ISCO and ISTHC without the ISNOx increase. It also yields good thermal efficiency.

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Advanced Diesel Combustion Using of Wide Range, High Boosted and Cooled EGR System by Single Cylinder Engine

Aoyagi

Osada

Misawa

et al. 2006

SAE Technical Paper Series

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Challenge to Super High Thermal Efficiency of Diesel Engine

Cited by 5 publications

References 8 publications

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

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

Diesel Combustion and Emission Using High Boost and High Injection Pressure in a Single Cylinder Engine(Effects of Boost Pressure and Timing Retardation on Thermal Efficiency and Exhaust Emissions)

Advanced Diesel Combustion Using of Wide Range, High Boosted and Cooled EGR System by Single Cylinder Engine

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