What is the ignition method of a diesel engine?
1 Answers
Diesel engine ignition methods are as follows: 1. Spark ignition: Spark ignition is a type of forced ignition method that utilizes the principle of arc discharge between the two electrodes of a spark plug to ignite the combustible mixture for rapid combustion. Near the end of the compression stroke, the combustible mixture composed of fuel and air is compressed by the piston in the cylinder to a certain pressure and temperature. A high-voltage current is immediately applied to the spark plug installed on the cylinder head, generating an electric spark in the cylinder to ignite the combustible mixture for combustion. 2. Compression ignition: Compression ignition is an ignition method specific to diesel engines. Diesel engines use diesel as fuel, which, compared to gasoline, has a lower auto-ignition temperature (around 220°C), higher viscosity, and is less prone to evaporation. Additionally, diesel engines do not have spark plugs, and their compression ratio is higher than that of gasoline engines. Therefore, diesel engines rely on the compression stroke to compress the mixture to its ignition point, causing it to auto-ignite. Hence, this ignition method is referred to as compression ignition.