PRO TECHNICIAN

Description.

Combustion Cycle
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3. Diesel engine combustion process
For the combustion process that occurs in the diesel engine, there is a relationship between the pressure inside the combustion chamber and the crank angle as shown on the left.
This combustion process can be divided into the following four stages.
(1) Ignition delay (A - B)
(2) Flame propagation (B - C)
(3) Direct combustion (C - D)
In this stage, the fuel is burned with the flame in the combustion chamber immediately after the injection.
The pressure from combustion rises more gradually because the fuel burns immediately after injection.
The pressure at this time can be adjusted to a certain extent by adjusting the fuel injection volume.
(4) After burning (D - E)
Combustion process (A - E)

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