The engine is divided into compression ignition engine and spark ignition engine, according to the use of fuel, engine is divided into gasoline engines and diesel engines, gaseous fuel engine, gas engine, liquefied petroleum gas engine and multi fuel engine, according to the classification of cooling, engine is divided into water-cooled engine, air-cooled engine, according to the classification of gas state, engine is divided into non supercharged and turbocharged engine, according to the number of stroke, engine is divided into two stroke engine and four stroke engine, according to the number and layout of cylinders, engine is divided into single cylinder engine and multi cylinder engine. Engine with only one cylinder is called single cylinder engine, engine with more than two cylinders called multi cylinder engine.
The gasoline engine is composed of two institutions and five systems, nameed the crank link mechanism, gas distribution mechanism, fuel supply system, lubrication system, cooling system, ignition system and starting system; Diesel Engine is composed of two institutions and four systems, nameed the crank link mechanism, gas distribution mechanism, fuel supply system, the lubrication system, cooling system and starting system, The diesel engine is ignited by compression ,and ignition system is not needed.
