The system and method that height for loose impediment controls

It discloses a kind of for controlling the method and system of loose impediment (10).This method may comprise steps of or the system can be configured as execution following steps: determine the difference between the Desired Height of loose impediment (10) and measurement height, determine the reference velocity of loose impediment (10), and based between Desired Height and measurement height difference and reference velocity adjust loose impediment (10).