Elevator car position and speed detection system and self-detection method thereof

Abstract

The invention relates to an elevator car position and speed detection system and a self-detection method thereof. A car is located in a shaft. The detection system comprises a grid scale vertically arranged in the shaft, a detection device for collecting grid scale information and a controller electrically connected with the detection device, wherein the grid scale at least contains a line of first-class identifications arranged vertically side by side and a line of second-class identifications matched with the first-class identifications to form binary coded information, and the binary coded information corresponding to the grid scale is non-repetitive; the detection device is fixed on the car and is provided with at least two first sensors which are arranged in the vertical direction and at least one second sensor for identifying the second-class identifications, and the first sensors are used for identifying the first-class identifications. Binary codes are generated after combination of detection signals of the second sensors and synchronizing signals of the first sensors, so that the absolute position of the detection device located in the grid scale is distinguished, the absolute position of the car located in the shaft is accurately obtained, the detection precision is high, and the detection cost is reduced.

Description

technical field [0001] The invention relates to the technical field of elevators, in particular to an elevator car position and speed detection system and a self-inspection method thereof. Background technique [0002] At present, the conventional detection method for the position of the elevator car is to calculate the actual rotation circumference of the traction sheave from the measurement signal of the rotary encoder on the host side, so as to convert the moving distance of the wire rope and the position and speed of the car. It is a traction-drag mechanical system, that is to say, the traction wheel and the wire rope are connected by friction transmission. There will be slippage between the traction wheel and the wire rope, and due to the change of gravity of the mechanical system, the change of the humidity extension of the wire rope, etc. The reason is that the position of the car calculated by the encoder on the host side is relatively inaccurate. Generally, it is ne...

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Problems solved by technology

[0002] At present, the conventional detection method for the position of the elevator car is to calculate the actual rotation circumference of the traction sheave from the measurement signal of the rotary encoder on the host side, so as to convert the moving distance of the wire rope and the position and speed of the car. It is a traction-drag mechanical system, that is to say, the traction wheel and the wire rope are connected by friction transmission, there will be slippage between the traction wheel and the wire rope, and due to the change of gravity of the mechanical system, the change of the humidity extension of the wire rope, etc. The reason is that the position of the car calculated by the encoder on the host side is relatively inaccurate. Generally, it is necessary to install multiple position sensors in the hoistway to continuously correct the real position of the car. Therefore, it is necessary to use a variety of equipment for detection, and the detection technology is complicated. And the detection cost is high

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