Ignition of a fuel charge by the heat of the air in a cylinder, generated by compression of the air, as in the diesel engine.
The rapid compression of air within the cylinders generates the heat required to ignite the fuel as it is injected.
Advantages over Spark Ignition:
- Low specific fuel consumption at both full load and part load conditions.
- Utilizes less expensive fuels.
- Reduced fire hazard.
- Long operating life.
- Better suited for supercharging.
- Better suited for two-stroke cycle operating, as there is no loss of fuel in scavenging.
Two-Stroke Compression Ignition
The two-stroke Compression Ignition engine does not suffer from the disadvantages of the spark ignition engine which are fuel loss and idling difficulty and hence CI engine is more suitable for two-stroke operation.
"Theory and Design of Automotive Engines", B Dinesh Prabhu, Assistant Professor, P E S College of Engineering, Mandya, KARNATAKA