Patent US 7,637,352

An elevator control system for controlling the movement of an elevator car up and down an elevator shaft between floors of a structure includes a call input device provided on each floor to indicate a passenger is waiting to be picked-up; a measuring device to indicate a load on the elevator car; and a controller to answer calls from the call input devices and move the elevator between floors, wherein the controller overrides calls received from the call input devices and does not stop the car to pick up passengers when the load indicates there a full car with no room for additional passengers. The measuring device may include a force transducer to measure the load on the elevator car. The load may be a measure of the number of passengers in the car. The load may be compared to a threshold and when the load exceeds the threshold a signal is provided to the controller to override the call input devices. The controller answers calls from the call input devices and stops the elevator to pick up passengers when the load indicates the car is not full and has room for passengers. The measuring device also may include a force transducer connected to an amplifier circuit connected to an over voltage protection circuit, wherein an output of the over voltage protection circuit is provided to the controller to indicate a full car with no room for additional passengers.