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.
The fuel injection into the combustion chamber ends at point D.
However, the remaining fuel, which could not burn, burns during this period.
As the after burning period gets longer, the exhaust temperature rises and the heat efficiency*1 lowers. *1: With heat engines, the heat efficiency means the ratio of heat energy converted into work compared to the heat energy of the supplied fuel.
