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Answer :
A diesel engine is a type of internal combustion engine that is widely used in cars, trucks, buses, ships, and some locomotives due to its efficiency and durability. Here are some key characteristics of a diesel engine:
Common Rail Fuel System:
- What it is: The common rail is a fuel injection system found in modern diesel engines where a high-pressure reservoir (the "rail") feeds fuel directly to each injector.
- Why it is important: This system allows for more precise control of the injection process, leading to better fuel efficiency and reduced emissions.
Lack of a Separate Ignition System:
- Explanation: Diesel engines do not have spark plugs, which are used in gasoline engines to ignite the air-fuel mixture. Instead, diesel engines rely on compressing air to such a high pressure and temperature that the fuel spontaneously ignites when injected.
- Why it matters: This self-ignition process makes diesel engines more efficient but also means they need a robust construction to withstand higher pressures.
Presence of Injectors:
- What they do: Injectors in a diesel engine spray a fine mist of fuel into the combustion chamber.
- Key purpose: The precision of fuel injection in terms of timing, pressure, and quantity is crucial for engine performance, efficiency, and emission control.
Overall, diesel engines are known for their efficiency and longevity, making them a suitable choice for many heavy-duty vehicles and applications. Understanding these characteristics can help in the maintenance and troubleshooting of these engines.
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