Capacitive Automatic Faucet Sensing for Precise Water Delivery
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Solution Overview
Problem
Existing automatic faucets struggle with accurately detecting user presence and delivering the right amount of water, often leading to inefficient water and energy usage due to sensitive sensors or difficult detection zones.
Innovation Solution
An automatic faucet assembly with a conductive faucet body and spout, an electromechanical valve, and a controller that uses capacitive sensing to detect user motion within an electric field, adjusting water flow based on specific capacitance signal amplitudes and thresholds to optimize water delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sensitive sensor is used to detect user presence, then the detection capability is improved, but the faucet dispenses water too easily leading to inadvertent delivery
Solution Approach 1:
The detection process is segmented into multiple stages: initial presence detection, confirmation phase, and activation phase. The controller requires multiple detection cycles or sustained detection thresholds to be met before activating water flow, preventing false positives from transient sensor signals.
Solution Approach 2:
The system implements feedback mechanisms where the controller continuously monitors sensor signals and adjusts its response based on the duration and consistency of detected presence. The valve state is feedback-controlled, remaining closed unless confirmed user intent is detected through sustained signal thresholds.
2Ease of operation
If the detection zone is made larger to improve ease of use, then user access is improved, but the sensor becomes less precise in locating the user
Solution Approach 1:
The detection system uses multiple sensor zones with different sensitivity levels and detection parameters. The electric field is distributed across the faucet body surface, creating localized detection regions that can independently sense user presence at different locations, maintaining both broad coverage and precise localization.
3Quantity of substance
If water flow duration is extended to ensure adequate delivery, then user satisfaction is improved, but water and energy waste increases
Solution Approach 1:
The water flow duration is dynamically adjusted based on real-time sensor feedback. The controller monitors the presence and position of the user throughout the dispensing process, extending or shortening the flow duration as needed to match actual user needs, rather than using fixed timing.
Solution Approach 2:
The system uses continuous feedback from capacitive sensors during water delivery to detect when the user removes their hand or moves away. The valve automatically closes when the detection signal drops below thresholds, ensuring water flow stops precisely when needed without excessive running.
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
The system effectively detects user presence and adjusts water flow to minimize waste by ensuring the right amount of water is delivered, enhancing efficiency and reducing energy consumption.
Implementation Method 1
the faucet body comprises an electrically conductive material and is configured to be associated with an electric field, and the controller is configured to detect motion of an end user in the electric field
Implementation Method 2
the faucet body comprises an electrically conductive material and is configured to be associated with an electric field
Data Source
AI summary
An automatic faucet assembly comprising a faucet body and spout; an electromechanical valve; a controller; and a power source, wherein the faucet body comprises an electrically conductive material and is configured to be associated with an electric field, the faucet spout is configured to deliver water when the electromechanical valve is in an open position and to not deliver water when the electromechanical valve is in a closed position, the controller, the faucet body, the electromechanical valve, and the power source are in electrical communication, and the controller is configured to detect motion of an end user in the electric field.