Elevator Control System with Code Tape Position Correction
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Solution Overview
Problem
The length of code tapes used for car position detection in elevators can change over time due to temperature changes, leading to significant positional deviations of the car.
Innovation Solution
An elevator control system that includes a code tape with added longitudinal position information, a reader in the car to read this information, a detection device to detect the car's position relative to a reference position, and a controller that corrects the car's absolute position using the read data when the detection device confirms the car's position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a code tape is used for car position detection, then the position detection function is provided, but the code tape length changes over time due to temperature changes causing positional deviation
Solution Approach 1:
The patent implements feedback by detecting the actual position of the car at reference positions (floors) and comparing it with the position read from the code tape. When a discrepancy is detected, the system automatically corrects the code tape position data to match the actual position, thereby compensating for thermal expansion or contraction of the code tape and maintaining accurate position detection.
Solution Approach 2:
The patent replaces the purely mechanical code tape position measurement system with an electronic correction system. Instead of relying solely on the physical code tape to maintain accurate positions, the system uses electronic sensors to detect actual car positions and electronically adjusts the code tape position data through a controller, substituting mechanical stability requirements with electronic compensation.
2Measurement precision
If manual operation adjustment is used to correct floor positions, then position accuracy can be improved, but the system requires frequent manual intervention and cannot adapt to temporal changes
Solution Approach 1:
The patent implements self-service by enabling the system to automatically detect position deviations and correct code tape position data without manual intervention. The correction device continuously monitors car positions at reference floors and automatically adjusts the position information, eliminating the need for periodic manual adjustments while maintaining high measurement precision.
Solution Approach 2:
The system performs preliminary correction actions by continuously monitoring car positions and automatically adjusting code tape position data before significant deviations accumulate. This proactive approach prevents positional errors from growing large, eliminating the need for subsequent manual correction operations.
Data Source
AI summary
In a control system, a code tape is placed in a hoistway with its vertical end parts serving as a fixed end and a movable end. A reader installed in a car reads information indicating a longitudinal position added to the code tape. A detection device detects that the car is in a reference position when a detection switch installed in the reference position on the movable end side of the hoistway detects a detection target cam installed in the car. A controller performs control processing using the position read by the reader as an absolute position of the car. The controller corrects the absolute position of the car using the longitudinal position read by the reader at the time of detection by the detection device.