Capacitive Elevator Panel Control for Unintended Button Presses
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Solution Overview
Problem
Capacitive elevator control panels face issues with unintentional triggering and capacitance drift due to external influences, leading to potential safety hazards and operational errors, as they cannot reliably distinguish between intended and unintended button presses.
Innovation Solution
A method for operating an elevator control panel with capacitive buttons that involves a control unit to detect actuation times and cancel unintended button presses by evaluating adjacent key changes, generating an alarm for prolonged presses, and calibrating keys only when not in use to maintain accurate capacitance readings, with wireless communication for remote monitoring and intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If capacitive buttons are used in the control panel, then the aesthetic appearance and adaptability to elevator design are improved, but unintentional activation and reliability deteriorate
Solution Approach 1:
The control unit acts as an intermediary that analyzes the relationship between adjacent button activations. When two adjacent buttons are activated simultaneously, the control unit intervenes to determine whether this represents intentional or unintentional activation, rather than directly executing either button's function. This mediator approach resolves the contradiction by adding intelligence to distinguish between aesthetic-friendly capacitive touch and reliable activation detection.
Solution Approach 2:
The system implements feedback by monitoring activation patterns of adjacent buttons and using this information to validate or cancel button presses. The control unit continuously evaluates whether simultaneous adjacent button activations represent intentional user input or unintentional contact, adjusting the system response based on this feedback loop. This feedback mechanism maintains reliability while preserving the aesthetic benefits of capacitive buttons.
2Ease of operation
If capacitive buttons are used without mechanical resistance, then ease of operation is improved, but user safety and activation accuracy worsen
Solution Approach 1:
The control unit performs preliminary analysis of button activation patterns before executing any function. When a button is activated, the system proactively checks for simultaneous activation of adjacent buttons and evaluates the duration and context of the press. This preliminary action prevents unintentional activations from triggering harmful effects while maintaining the ease of capacitive operation.
Solution Approach 2:
The system dynamically adjusts its response based on the characteristics of button activation. Rather than using fixed thresholds, the control unit evaluates multiple parameters including activation duration, adjacent button states, and temporal patterns to dynamically determine whether an activation is intentional. This dynamic approach maintains ease of operation while adapting to different usage scenarios to prevent unintentional activation.
3Measurement precision
If capacitive buttons are calibrated periodically, then measurement precision is maintained, but operational interruptions and complexity increase
Solution Approach 1:
The control unit performs self-calibration by automatically adjusting capacitance thresholds based on observed activation patterns and environmental conditions. Rather than requiring manual calibration procedures, the system serves itself by continuously learning from actual button press characteristics and adapting its detection parameters. This self-service approach maintains measurement precision while eliminating the complexity of manual calibration management.
Solution Approach 2:
The system implements periodic evaluation of capacitance thresholds based on operational experience rather than fixed time intervals. The control unit continuously monitors button activation patterns and periodically adjusts calibration parameters when sufficient data is accumulated, rather than following rigid periodic schedules. This approach maintains precision while reducing unnecessary calibration operations and associated complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enhances the reliability and safety of elevator operations by reducing unintentional button activations, preventing critical situations, and ensuring precise capacitance calibration, thereby minimizing the risk of accidents and ensuring consistent panel performance.
Implementation Method 1
A change in capacitance or charge resulting from an electric field that responds to touch is detected by the capacitive button
Data Source
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AI summary
The present invention relates to a method for operating an elevator and an operating panel for an elevator for carrying out the method and an elevator having such an operating panel, and to a computer program product prompting this method to be carried out and a computer-readable medium with the computer program product stored thereon. The operating panel (1) has a plurality of capacitive buttons (2) and a control unit (3), which evaluates a change in capacitance of the capacitive buttons (2) in order to identify the button (2) being operated. If an operation of a first button (2a) is identified, the operation duration of said first button (2a) exceeds a specified first time period, and an operation of at least one second button (2b) disposed adjacent to the first button (2a) is identified, then the operation of the first button (2a) is controlled on the basis of a change in capacitance of the operated second button (2b) such that the control unit (3) annuls the operation of the first button (2a) if the operation of the second button (2b) persists during a specified testing period.