US 4,999,551 A · Method for controlling opening/closing of door in automatic door system

Abstract

A method for controlling opening/closing of a door in an automatic door system comprises the steps of causing the door to conduct opening operation to its opening-stop limit by an initial opening signal transmitted after the power supply is put to work and the arrival of the door at its closing-stop point is confirmed, and measuring the opening stroke at that time; causing the door to conduct closing operation to its closing-stop point when it is stopped at opening-stop point and no opening signal is inputted, and measuring the closing stroke of the door at that time; computing the difference between the measured opening and closing strokes upon stopping of the door at its closing-stop point; and outputting a signal of abnormal condition if the difference is more than a present value, or causing the door to conduct normal opening/closing operation if it is less than the preset value. Thus, the opening/closing operation of the door can be made at a high speed by a preset distance in the beginning of the whole stroke, and thereafter at a low speed.

Claims4

Dependent claims

A method for controlling opening/closing of a door in an automatic door system comprising the steps of:

causing the door to conduct an opening operation to its opening-stop point by the action of an initial opening signal transmitted after a power supply switch is turned on and the arrival of the door at its closing-stop has been confirmed, and measuring the length of opening stroke of the door at that time;
causing the door to conduct a closing operation to its closing-stop point when the door is stopped at the opening-stop point and no opening signal is inputted, and measuring the length of closing stroke of the door at that time;
and
computing the difference between the measured length of opening stroke and that of closing stroke when the door is stopped at the closing-stop point, and outputting a signal indicative of the occurrence of abnormal condition if the difference in stroke is more than a preset value, or causing the door to conduct its normal opening/closing operation if the difference in stroke is less than the preset value.

1 more element

A method for controlling opening/closing of a door in an automatic door system comprising the steps of:

causing the door to conduct a high speed opening operation over a predetermined distance by the action of an initial opening signal transmitted after a power supply switch is turned on and the arrival of the door at its closing stop point has been confirmed, and then applying brake to a door driving motor to decelerate the same to thereby decelerate the door, and measuring the initial acceleration and the deceleration upon braking of the door;
causing the door to conduct a low speed opening operation to its opening-stop point;
subsequently causing the door to conduct a high speed closing operation by a predetermined distance when the door is stopped at its opening-stop point and door opening signal is not inputted, and then applying brake to the motor to decelerate the same to thereby decelerate the door, and measuring the initial acceleration and the deceleration upon braking of the door at that time;
thereafter causing the door to conduct a low speed closing operation to its closing-stop point;
and
comparing the measured initial acceleration and deceleration upon braking of the door with a preset acceleration and a preset deceleration upon stopping of the door at its closing-stop point, and outputting a signal which is indicative of the occurrence of abnormal condition if the difference is out of an allowable range, or causing the door to conduct normal opening/closing operation if said difference is within the allowable range.

3 more elements

Dependencies are inferred from the claim text.

Method for controlling opening/closing of door in automatic door system

Life of this patent

Method for controlling opening/closing of door in automatic door system

Life of this patent

Abstract

Claims4