Patent ID: 6701277
Filing Date: 2004-03-02
Classification: B66B

Abstract:
A method for generating a position signal for indicating a position of an elevator car within a hoistway, the hoistway including an elevator landing, one of a position actuator and position sensor located proximate the landing, the car including the other one of said position actuator and position sensor, the elevator car drivingly coupled to an encoder for generating an encoder signal indicative of the position of the car within the hoistway, and a controller in communication with the encoder and position sensor, the controller including a reference table having reference value the method comprising the steps of:generating a position correction event signal upon actuation of the position sensor by the position actuator indicating the elevator car is located proximate the landing; capturing a first running position counter value from the running position counter upon generation of the position correction event signal; reading the reference value from the reference table; capturing a second running position counter value from the running position counter; comparing the first running position counter value to the second running position counter value to determine a difference value; modifying the reference value by the difference value; and, providing the modified reference value as the position signal.