The ignition system of an automobile engine, can be divided into a compression-ignition and spark ignition . Compression ignition
a compression-ignition: a lighter embodiment a diesel engine, a diesel engine as a diesel fuel compared to gasoline, diesel fuel self-ignition temperature is low (about 220 deg.] C), and is not readily evaporate large viscosity. Does not have a spark plug and the diesel engine, the compression ratio should be greater than gasoline engines, diesel engines rely on the compression stroke and therefore the mixed gas is compressed to ignition, it automatically fire, so that this ignition is compression-ignition.
A spark ignition
spark-ignition: one kind of ignition gasoline engine, gasoline autoignition temperature (approximately 480 deg.] C) is greater than the diesel engine, and the viscosity small easily vaporized, it is possible to form a uniform air-fuel mixture in the cylinder with the outside air, or directly into the cylinder with the fuel injection system and the gas mixture by the spark ignition of the spark plug at the end of the compression stroke, so that this ignition spark ignition.