Diesel Engine Emissions Controls
Diesel engines have high efficiency, high torque, and outstanding longevity. Not so favorable is excessive exhaust emission , especially regarding carbon soot particulates and NOx. Thus, measures are needed to meet ever-tightening emissions regulations that are being enforced in developed c...
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Black Smoke, Cause, Impact, and Prevention
We have all seen clouds of black smoke emanating from the exhaust stacks of heavy duty diesel trucks especially when the truck is under high load or hard acceleration. The black smoke is composed primarily of elemental carbon from incomplete combustion of diesel fuel and traces of engine lubric...
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Turbocharging of Diesel Engines
Turbochargers (also known as turbosuperchargers or turbos) for medium-heavy highway diesel engines, which boost intake air pressure, are now standard practice. The turbo principal involves the harnessing of pressurized hot exhaust gas to spin a radial-inflow turbine (the hot side) that directly dri...
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Fundamentals of Compression-Ignition Engines (Part 1)
Compression-ignition (CI) engines, also known as diesel engines, are ubiquitous prime movers with many commercially important applications (motor vehicles, marine, locomotive, off-highway mobile machinery, various stationary uses?such as power generation, some aircraft and more). Rudolf Diesel i...
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Fundamentals of Compression-Ignition Engines (Part 2)
A big advantage of CI engines over gasoline spark-ignited is thermal efficiency, which is due to the higher compression ratio. Highway diesels today achieve peak efficiencies on the order of 35-45 percent, whereas a gasoline engine will do well to achieve 25 percent (and that is only reached at wid...
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Downsizing and Downspeeding of Diesel Engines
Downsizing and downspeeding of diesels are strategies to enhance fuel economy and reduce emissions. They are not yet widespread but could become more common in five plus years. Downsizing and downspeeding strategies have been successfully applied for light duty gasoline vehicles to improve fuel...
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