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.
In this stage, ignition starts from the areas within the air-fuel gas that have reached the proper ratio, and then continues to burn outward. From point B to C, the pressure rises sharply.
The rise of pressure is affected by the volume of fuel injected at ignition delay, fuel spraying condition and air-fuel mixture, etc.
