LINEAR ACTUATOR CONTROL STRUCTURE

摘要

A control system for a linear actuator having an electric motor (20) drawing a variable current during operation. The control system includes a current level sensor (38) for determining an operational current level of the linear actuator and a controller for generating a drive signal (42) and a force request signal (44) representative of a desired current level of the linear actuator. The drive signal remains constant during a predetermined time interval of the controller. The control system further includes a current limiting component (34) for receiving the force request signal, the current level of the linear actuator and the drive signal. The current limiting component minimizes the current level of the electric motor in response to a comparison between the force request signal and the desired current level within a time interval substantially smaller than the predetermined time interval of the controller.