The combustion process of gasoline engine is divided into several stages. How are they divided?

1, ignition delay period (ignition delay period) is formed from spark plug to flame center → ignition delay period. 2. The obvious combustion period (rapid combustion period) is called the obvious combustion period from the formation of the flame center to the pressure reaching the highest point on the indicator diagram. 3. after-combustion period refers to the combustion in the expansion process after the obvious combustion period, which is mainly caused by the reburning of unburned fuel on the flame front and the reoxidation of some combustion products (H2, O2, CO, etc.). ) pyrolysis.