Patent ID: 7950499

Claim:
A control apparatus for an elevator comprising: a support device mounted on a car and including a rail holding member which is displaceable with respect to the car, the car moving up and down in a hoistway, and guided by a guide rail located in the hoistway, wherein the rail holding member includes a plurality of guide rollers; a reference position detection device, mounted on the rail holding member, for detecting an object fixedly located in the hoistway, when the car is located at a reference position within the hoistway; a position detection device, mounted on the rail holding member, for detecting position of the car in the hoistway, the position detection device including a plurality of continuous position detection parts, each continuous position detection part respectively detecting the position of the car, continuously, based on rotation of the guide rollers; and a control unit that controls operation of the elevator apparatus based on information received from the reference position detection device and the position detection device, wherein the control unit compares position information received from each of the continuous position detection parts to each other and detects no abnormality when no difference between the position information received exceeds a first difference threshold, compares continuous detection part calculated values, which are calculated based on the position information received from each of the continuous position detection parts, to determine the position of the car in the hoistway, with the reference position detected by the reference position detection device, when the reference position detection part detects the object, and replaces the position of the car in the hoistway determined from the continuous detection part calculated values with the reference position when difference between the positions determined from the continuous detection parts and the reference position detection device does not exceed a position threshold, and, thereafter, controls the operation of the elevator apparatus based on the position of the car as replaced.