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an engine is a machine that can convert other forms of energy into mechanical energy, including internal combustion engines (reciprocating piston engines), external combustion engines (stirling engines, steam engines, etc.), jet engines, electric motors, etc. engines can be applied to power generation devices, or they can refer to the entire machine that includes the power device (such as gasoline engines, aircraft engines). high-end engines include aircraft engines, automobile engines, rocket engines, etc.

in terms of aviation engines, my country's aviation engine industry, represented by the china aerospace science and industry corporation, has basically acquired the ability to develop and produce various types of military large, medium and small turbojets, turbofans, turboshafts, etc. however, there is still a certain gap compared with advanced western countries.

in terms of automobile engines, chinese independent brand automobile engine manufacturers have gradually improved their r&d level and technological innovation capabilities through the introduction, digestion and absorption of international advanced technologies, and the self-sufficiency rate of automobile engines has gradually increased. from january to december 2021, the cumulative sales volume of automobile engines reached 22.4369 million units, and from january to october 2022, the cumulative sales volume of automobile engines reached 17.6289 million units.

in terms of rocket engines, my country successfully completed 62 space launches in 2022. the wentian and mengtian experimental modules were successfully launched, and the shenzhou 14 and 15 missions were successively implemented, and the chinese space station was fully built. chang'e 5 discovered a new lunar mineral "chang'e stone". the jumang land ecosystem carbon monitoring satellite and the atmospheric environment monitoring satellite were successfully launched and operated. the long march 8 carrier rocket launched 22 satellites in one shot. the third aircraft carrier fujian was launched. the domestically produced c919 large passenger aircraft obtained the type certificate and the first one was delivered. the hualong one independent third-generation nuclear power unit put into commercial operation maintains safe and stable operation.