When the device detects acceleration, it sends a signal to a small electric servomotor that rotates a sleeve on the axle to shift the planetary gears.

• 当仪器侦测到轮子加速，就会将讯号传送到一个小型的电子伺服马达，马达会带动轮轴上的套筒，然后变换行星齿轮的位置。