Are you sure ? 我的车的manual 对此是这样说的。

 
  看了班主的回帖，拿来车的Manual 看了 Cruise Control 部分。下坡部分是这样写的。 "On Downhill grades, the cruise control maintains the set speed by braking with the vehicle's brake system. In addition, on longer dowwnhill grades, the automatic transmission will down shift automatically. " 看着和US_CAR 说的 “EngineBrake"是一回事。