Swing door-based entrance system with automatic recognition of linkage reduction

Abstract

An entrance system () comprises a swing door member () having a door leaf (), and a sensor unit (S; S) mounted to the door leaf (), the sensor unit comprising a door angle sensor (S). The entrance system () further comprises an automatic door operator () having a motor () capable of causing movement of the door member (), a controller () for controlling operation of the motor (), and a linkage () connected to the automatic door operator () and the door leaf () for transferring torque generated by the motor () to the door leaf (). The automatic door operator () is operable in a learn mode () and an operational mode (). In the learn mode (), the controller establishes a linkage reduction curve () relating a movement of said door member () with the torque required to move the door leaf () through different angles (α). The door leaf angles are determined from measurement readings of said door angle sensor (S). In the operational mode (), the controller compensates for a non-linear torque transfer characteristic of the linkage () by applying the linkage reduction curve () to control the motor ().