Diesel engines are made with diesel fuel combustion engines. Diesel engine belong to compression ignition type engine, it often in main inventor Rudolf name called Rudolf engine. Diesel engine is at work, the air inhaled diesel engine cylinder piston sport, because by higher degree of compression, to reach 500 ~ 700 temperature high temperature. Then will fuel injection with mist shape in the high temperature air mixture, and high temperature air mixture, automatic fire burning. Burning during the energy released role on the piston top, drive the pistons and through the connecting rod and crankshaft convert rotating mechanical work.