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Elevator apparatus including main and auxiliary sensors

  • US 7,540,358 B2
  • Filed: 05/31/2004
  • Issued: 06/02/2009
  • Est. Priority Date: 05/31/2004
  • Status: Active Grant
First Claim
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1. An elevator apparatus comprising:

  • a car raised and lowered within a hoistway;

    a main sensor unit configured to generate a main detection signal corresponding to a movement amount of the car;

    a control device configured to obtain car information including at least one of car position information and car speed information based on the main detection signal, and control operation of the car in accordance with the car information;

    an auxiliary sensor unit configured to generate an auxiliary detection signal upon detecting an arrival of the car at a preset reference position within the hoistway; and

    the control device is further configured to make a correction to the car information based on the auxiliary detection signal, determine a threshold speed for the car, and monitor the car speed information in the car information to determine whether the car has reached the threshold speed.

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