The engine is the heart of a car. The development of automobile is directly related to the progress of engine.

/kloc-in the middle of the 0/8th century, Watt invented the steam engine, and people began to imagine putting the steam engine on a car to carry people. N.J.Cugnot of France was the first person to install a steam engine in a car. 1770, Guniu built a three-wheeled steam locomotive. With a total length of 7.23 meters and a speed of 3.5 kilometers per hour, it is the first steam locomotive in the world.

1858, Renault, who lived in Paris, France, invented the gas engine and applied for a patent in 1860. The engine uses the mixture of gas and air to replace the steam of the reciprocating steam engine, uses batteries and induction coils to generate electric sparks, and uses the electric sparks to ignite the mixture and explode. This engine has a cylinder, a piston, a connecting rod and a flywheel. Gas engine is the primary product of internal combustion engine, because the compression ratio of gas engine is zero.

1867, Otto, Germany (Nikolai

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Otto) was inspired by Renault's development of gas engines, and did a lot of research on gas engines. After improvement, his samples were exhibited at the international exhibition held in France in 1878. Because of its high working efficiency, this engine has aroused great interest of visitors. In the long-term research process, Otto put forward the four-stroke theory of internal combustion engine, which laid a theoretical foundation for the invention of internal combustion engine. Germans Omray and karl benz developed their own modern gasoline engine according to the principle of Otto engine, paving the way for the development of automobiles.

1892, German engineer Diesel developed a compression ignition diesel engine according to the principle of constant pressure thermodynamic cycle, and obtained the patent right to manufacture this engine.

1957, the German Wankel invented the rotary piston engine, which is an important branch of gasoline engine development. The characteristic of rotary engine is that the triangle piston motion is directly converted into rotary motion by combining the inner rotor epicycloid and the outer rotor epicycloid, without crankshaft connecting rod and valve train. Compared with reciprocating piston gasoline, it has 40% fewer parts, light weight, small volume, high speed and high power. 1958, Wankel changed the outer rotor into a fixed rotor with planetary motion, and made a new rotary piston engine with power of 22.79 kW and speed of 5500 rpm. This machine has important development value, so it has attracted the attention of all countries. Japan Toyo Company (Mazda Company) purchased the prototype of the rotary engine and installed it on the car. It can be said that the rotary engine was born in Germany and grew up in Japan.