Elevator control system for landing control based on correcting governor rope distance

An elevator control system for controlling an elevator, comprising:

• a governor, which includes a governor rope and a governor sheave;
• an rpm detector to output an rpm signal according to rotation of the governor;
• a plurality of landing plates respectively associated with a plurality of floor positions in a building, including on a destination floor of the building;
• a landing-plate detector on a car of the elevator, and to detect each of the plurality of landing plates along with movement of the car according to a speed command value for moving the car to the destination floor;
• and
• a controller to control a travel of the car of the elevator based on the rpm signal output from the rpm detector and a result of the detection performed by the landing-plate detector, the controller comprising:
• a plate access detector to detect a change of a state of the landing-plate detector from a state under which none of the plurality of landing plates are detected to a state under which at least one of the plurality of landing plates is detected as an access state;
• a first remaining-distance calculator to calculate a remaining distance to the destination floor as a first remaining distance based on the rpm signal output from the rpm detector;
• a second remaining-distance calculator to calculate, in accordance with elapsed time from achievement of the access state, an ideal remaining distance for landing the car at an ideal deceleration/acceleration rate from achievement of the access state at the destination floor by detecting a landing plate, of the plurality of landing plates, at the destination floor to stop at the destination floor, as a second remaining distance based on a result of detection performed by the plate access detector;
• an expansion-and-contraction amount estimator to estimate, in accordance with the elapsed time, an expansion or contraction amount of the governor rope from a difference value between the first remaining distance and the second remaining distance;
• an expansion-and-contraction amount corrector to calculate, in accordance with the elapsed time, a correction value based on the estimated expansion or contraction amount estimated by the expansion-and-contraction amount estimator, add the correction value to correct, the first remaining distance, and output the corrected first remaining distance;
• and
• a speed-command calculator to output the speed command value for landing the car on the destination floor at the ideal declaration/acceleration rate based on the corrected first remaining distance output from the expansion-and-contraction amount corrector.