关键词: 汽车发动机；节能技术；可变配气系统

Abstract: In the context of sustainable development of society, automobile energy conservation has been the focus of people's attention, the engine as the heart of the automobile, its energy saving technology research is also very important. This paper briefly introduces the principle of automobile engine energy saving, summarize and analyze the key technologies and research status of engine energy saving, such as gasoline direct injection, fuel stratified injection, variable compression ratio and variable valve system, and put forward the prospect of future development of engine energy saving technology, hoping to provide theoretical basis and reference direction for subsequent research.

Key words: Automobile engine; Energy conservation technology; Variable valve system