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 diesel 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; 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.

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