Diesel Engine Topics - They Are Sophisticated And Difficult To Diagnose
Diesel Engine Topics – They Are Sophisticated And Difficult To Diagnose

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Diesel engine:

  • Any internal combustion engine in which; air is compressed to a high temperature.
  • Ignite diesel fuel injected into the cylinder; where combustion and expansion actuate a piston.
  • Converts the chemical energy; stored in the fuel into mechanical energy.

So, The diesel engine is an intermittent combustion piston cylinder device. It operates on either; a two stroke or four stroke cycle. However, the engine induces; only air into the combustion chamber on its intake stroke. Engines with bores of greater than 600 mm; are almost exclusively; two stroke cycle systems.

The combustion process in a diesel engine is heterogeneous. Consequently, rapid vaporization and mixing of fuel in air; is very important; to thorough burning of the injected fuel. So, This places much emphasis on injector nozzle design; especially in direct injection engines.

The power stroke includes both:

  • Constant pressure process during combustion.
  • Expansion of the hot products of combustion; after fuel injection ceases.

Consequently, a turbocharger and aftercooler; can enhance the performance of a diesel engine; in terms of both power and efficiency.

Higher theoretical cycle efficiencies; when compared with the latter; can often be realized. The theoretical efficiency of the spark ignition engine; is greater than that of the compression ignition engine. However, in practice it is possible to operate compression ignition engines; at compression ratios high enough; to produce efficiencies greater than those attainable; with spark ignition systems. Furthermore, they do not rely on throttling the intake mixture to control power.

So, The principal drawback is their emission of air pollutants. As a result, These engines typically discharge high levels of particulate matter (soot). As a result, in the small engine category; consumer acceptance is low.

Advantages and disadvantages of diesel engines

Diesels are the most versatile fuel-burning engines in common use today; found in everything from trains and cranes to bulldozers and submarines. Compared to gasoline engines, they’re simpler, more efficient, and more economical. They’re also safer. Because, diesel fuel is less volatile and its vapor less explosive than gasoline. Unlike gasoline engines, they’re particularly good for moving large loads at low speeds. So, they’re ideal for use in freight-hauling ships, trucks, buses, and locomotives. Higher compression means the parts of a diesel engine have to withstand; far greater stresses and strains than those in a gasoline engine. That’s why they need to be stronger and heavier and why, for a long time; they were used only to power large vehicles and machines. While this may seem a drawback; it means diesel engines are typically more robust and last a lot longer, than gasoline engines.

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