Automatic locking after landing

ArduCopter
1

Using land mode or RTL, aircraft cannot be automatically locked after landing, I what parameters need to be modified to improve the situation?

2

落地自动关闭螺旋桨，是哪些参数来控制的，是飞机在检测到碰撞后关闭螺旋桨吗？所以是imu控制吗？