The author begins with the necessity and importance of AFR control(espe-cially the transient AFR) in automobile engine and researches on this issue that have been done both domestically and abroad.

• 首先,介绍了研究汽车发动机空燃比(特别是瞬态空燃比)控制的必要性和重要性,以及国内外研究现状。