The invention relates to a control method for a quick change device of a work tool, comprising the steps of: receiving a command to disengage a work tool clamping device； determining whether the work tool clamping device is in an engaged state； detecting functionality of a disengagement alarm if the work tool is in the engaged state； switching to an emergency state upon the detection of failure of the disengagement alarm. The present invention further relates to a corresponding control apparatus and work machine.
