Progress of Heavy Truck Diesel Engines in Japan

Kobayashi, Akio; Suzuki, Takashi

doi:10.4271/880466

Cited by 1 publication

(1 citation statement)

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“…Heavy-duty diesel engines have undergone continuous improvement in fuel consumption and exhaust emissions through change from a pre-chamber type to a direct-injection type, combustion modification using highpressure injection and swirl air motion (1) , adoption of turbo-intercoolers (2), (3) , and alteration of piston materials from aluminum to iron (4) . Those improvements have earned a worldwide reputation for diesel engines as the prime movers of low CO 2 emission (5) .…”

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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