Method for position feedback based control for overload protection

摘要

A method for executing mechanical overload protection to prevent commanding a control signal to a linear actuator that may mechanically overload the linear actuator when an overload condition of the linear actuator is detected, the linear actuator utilized for controlling a movable element associated with the linear actuator responsive to the control signal, includes monitoring an overload condition based on position change of the movable element associated with the linear actuator during an integration period and excess energy during the integration period, de-energizing the linear actuator when an overload condition has been detected, monitoring an overload retry counter based on the number of cycles the overload condition is detected, comparing the overload retry counter to an overload retry threshold, an reenergizing the linear actuator when the overload retry counter is less than the overload retry threshold and maintaining de-energizing of the linear actuator when the overload retry counter is at least the overload retry threshold.

主权项

1. Method for executing mechanical overload protection to prevent commanding a control signal to a linear actuator that may mechanically overload the linear actuator when an overload condition of the linear actuator is detected, the linear actuator utilized for controlling a movable element associated with the linear actuator responsive to the control signal, comprising:
monitoring an overload condition based on position change of the movable element associated with the linear actuator during an integration period and excess energy during the integration period, comprising:
monitoring position change of the movable element associated with the linear actuator during the integration period comprising monitoring a present feedback signal of the movable element indicating a present position of the movable element, monitoring a command signal of the movable element indicating a preferred position of the movable element, comparing the present feedback signal and the command signal and determining a position change based a difference between the present feedback signal and the command signal;comparing the position change to a position change threshold; anddetecting an overload condition does not exist when the position change is less than the position change threshold; de-energizing the linear actuator when existence of the overload condition has been detected; monitoring an overload retry counter based on the number of cycles existence of the overload condition is detected; comparing the overload retry counter to an overload retry threshold; and reenergizing the linear actuator when the overload retry counter is less than the overload retry threshold and maintaining de-energizing of the linear actuator when the overload retry counter is at least the overload retry threshold.