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| Diesel engine | |
|---|---|
| Name | Diesel engine |
| Type | Internal combustion engine |
| Inventor | Rudolf Diesel |
| Year | 1893 |
| Fuel | Diesel fuel, biodiesel, alternative fuels |
| Application | Trucks, ships, locomotives, power generation |
Diesel engine A diesel engine is a compression-ignition internal combustion engine invented in the late 19th century. It converts chemical energy of liquid fuels into mechanical work using high-compression ignition, and it is widely used in heavy transport, marine, rail, and stationary power sectors. Diesel designs vary from small single-cylinder units to large two-stroke marine engines built for ocean-going vessels.
Diesel engines are characterized by high compression ratios, direct or indirect injection systems, and robust construction to withstand elevated cylinder pressures. Major early contributors include Rudolf Diesel and contemporary firms such as MAN SE and Wärtsilä that commercialized differing architectures. Diesel technology intersects with developments by organizations like Society of Automotive Engineers and standards set by bodies such as International Organization for Standardization.
Rudolf Diesel demonstrated a working prototype in 1893 and secured patents that stimulated industry adoption across Europe and North America. Early commercialization involved manufacturers including Sulzer and Benz & Cie.; later mass adoption in trucks and buses was driven by companies like Daimler and Cummins Inc.. Naval and rail applications were advanced during the 20th century by builders such as Harland and Wolff and Electro-Motive Diesel, while postwar reconstruction and globalization expanded diesel use in regions represented by European Coal and Steel Community and United States Department of Energy initiatives.
Typical diesel engines use a four-stroke or two-stroke cycle with components such as a crankshaft, cylinders, pistons, and fuel injectors. Engine manufacturers including John Deere, Caterpillar Inc., and MTU Friedrichshafen produce variants employing turbocharging from suppliers like BorgWarner and aftertreatment systems by Bosch (company). Control systems use electronic units influenced by research at institutions such as Massachusetts Institute of Technology and Technical University of Munich for injection timing and emissions management. Large slow-speed marine diesels by MAN Energy Solutions use crosshead designs, while high-speed automotive diesels from Fiat and General Motors prioritize compactness and lightweight materials.
Diesel engines burn a range of fuels including petroleum-derived diesel, blends with biodiesel, and alternative fuels investigated by National Renewable Energy Laboratory and Shell plc. Combustion entails fuel injection, atomization, vaporization, mixing, and high-temperature autoignition under pressure; injector technology advanced by firms like Continental AG and Denso improves spray patterns and emissions. Research from Fraunhofer Society and Lawrence Berkeley National Laboratory explores low-temperature combustion modes and fuel chemistry to reduce pollutants.
Diesel engines typically achieve higher thermal efficiency than spark-ignition engines due to higher compression ratios and lean-burn operation; comparisons appear in studies from European Commission programs and Argonne National Laboratory. Turbocharging and intercooling, pioneered in part by Honeywell (formerly Garrett Motion), increase power density. Performance metrics used by manufacturers such as Volvo Group and Scania AB include brake specific fuel consumption, torque curves, and power-to-weight ratios; engine control strategies derived from research at Carnegie Mellon University optimize transient response.
Diesel engines power heavy-duty trucks by companies like Daimler Truck AG and PACCAR, buses from firms such as Alexander Dennis, marine propulsion for operators like Maersk Line, and locomotives built by Siemens Mobility and General Electric. Stationary power plants using diesel gensets serve data centers and remote communities, with deployments coordinated by agencies such as International Energy Agency. Off-highway uses include agricultural machinery from AGCO Corporation and construction equipment by Komatsu.
Diesel combustion emits nitrogen oxides and particulate matter; regulation by authorities such as European Union (Euro standards) and United States Environmental Protection Agency has driven adoption of particulate filters and selective catalytic reduction supplied by companies like Umicore. Studies by World Health Organization and Intergovernmental Panel on Climate Change assess public health and climate impacts, prompting transitions to cleaner fuels and electrification strategies advocated by organizations like International Maritime Organization. Lifecycle analyses by Organisation for Economic Co-operation and Development compare greenhouse gas footprints of diesel versus alternatives.
Diesel engines are valued for durability and long service intervals; maintenance practices promoted by manufacturers such as MAN Truck & Bus and Rolls-Royce Holdings include scheduled oil changes, fuel filtration, and injector servicing. Condition monitoring using vibration analysis and oil spectroscopy is applied by service networks associated with Bureau Veritas and DNV. Reliability in critical installations is supported by redundancy and preventive maintenance strategies recommended by standards from American Society of Mechanical Engineers.
Category:Internal combustion engines