×

Elevator door control responsive to obstructions

  • US 5,162,711 A
  • Filed: 11/16/1990
  • Issued: 11/10/1992
  • Est. Priority Date: 11/27/1989
  • Status: Expired due to Term
First Claim
Patent Images

1. A method for automatically operating car doors in an elevator system having a door operating apparatus which moves door leaves of a car door by means of a door motor and door leaves of a shaft door by way of entraining members on the car door leaves between a closed end position and an open end position and which permits the car door leaves to stop in any position between the end positions, move further in the same direction or reverse, comprising the steps of:

  • a. generating a regulating error difference signal "dV" representing a difference between an desired speed of door closing and an actual speed of door closing produced by an external interference force acting upon car door leaves of a closing elevator door;

    b. comparing a value of said difference signal "dV" with a value of a predetermined tolerance signal "dVmax";

    c. initiating stopping and reversing of direction of the closing car door leaves when a value of said difference signal "dV" exceeds a value of said predetermined tolerance signal "dVmax"; and

    d. generating respective positive and negative tolerance curves from a target value curve representing the desired speed of door closing versus time and obtaining said predetermined tolerance signal "dVmax" as a difference between said target value curve and each of said tolerance curves as a function of time and performing the step c. when said value of said difference signal "dV" is negative and exceeds said difference between said target value curve and said negative tolerance curve.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×