本文重点介绍了宝马汽车发动机第三代可变气门技术的结构特点和工作原理。与第二代结构相比采用新型的电子元件，提升了气门控制的响应时间，改善发动机的经济性和动力性。%This paper mainly introduces the structure features and working principles of the third-generation variable valve technology of BMW engine. Compared with the second-generation, a new type of electronic components is used, which has promoted the response time of valve control, and improved the economy and power of the engine.
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