The Working Principle of Engines

"If an engine is to work successfully then it has to follow a cycle of operations in a sequential manner. The sequence is quite rigid and cannot be changed. In this topic the working principle of both spark-ignition (SI) and compression-ignition (CI) engines is described. Even though both engines have much in common there are certain fundamental differences. The credit of inventing the spark-ignition engine goes to Nicolaus A. Otto (1876) whereas compression-ignition engine was invented by Rudolf Diesel (1892). Therefore, they are often referred to as Otto engine and Diesel engine. "