Touchless Faucet Temperature Control With Reliable Presence Sensing
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Solution Overview
Problem
Existing automatic faucets lack the ability to detect user presence accurately, adjust water temperature, and provide guidance for proper handwashing, while minimizing energy and water waste in residential settings.
Innovation Solution
A touchless faucet assembly with a presence sensor, temperature control, and a controller that adjusts water flow and temperature based on user presence, and provides handwashing instructions through a display surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If a presence sensor is used to detect user presence, then water waste is reduced, but the faucet may not accurately detect the user or provide temperature control
Solution Approach 1:
The patent introduces an intermediary processing system that receives signals from the presence sensor and processes them through a controller with microprocessor. This intermediary layer filters and validates sensor signals to distinguish between actual user presence and false triggers (such as passing by or environmental factors), thereby improving detection accuracy while maintaining water savings.
Solution Approach 2:
The system incorporates feedback mechanisms where the controller continuously monitors sensor inputs and adjusts water flow accordingly. The system provides feedback to confirm proper handwashing duration (20 seconds) and temperature settings, ensuring reliable operation while minimizing water waste through precise control.
2Object-affected harmful factors
If the faucet is set to automatic hands-free operation, then contamination touch-points are reduced, but the user cannot control water temperature
Solution Approach 1:
The patent replaces mechanical temperature control (manual mixing valves requiring hand contact) with an automated electromechanical system. The controller receives temperature preferences through touchless or minimal-contact interfaces and automatically adjusts the mixing valve positions electronically, eliminating the need for users to touch hot/cold handles while maintaining full temperature control capability.
Solution Approach 2:
The system allows users to pre-set their temperature preferences through the control interface, and the faucet automatically adjusts to these settings without requiring manual intervention during operation. The system serves itself by maintaining the desired temperature automatically once set, reducing the need for user interaction.
3Use of energy by moving object
If the faucet delivers pre-set temperature water, then energy consumption is reduced, but the user must wait for water to warm up and cannot know the temperature setting
Solution Approach 1:
The system performs preliminary actions by pre-heating water to a set temperature before user arrival and maintaining it ready in the pipes. The controller pre-configures the mixing valve positions based on user preferences stored in memory, so when the user approaches, water is already at the correct temperature, eliminating wait time while maintaining energy efficiency through precise control.
Solution Approach 2:
The patent incorporates visual indicators (such as LED lights or display elements) that change color or illuminate to indicate the current water temperature setting and status. This provides users with immediate visual feedback about the temperature without requiring them to touch or wait, while the system maintains energy efficiency through automated control.
4Object-affected harmful factors
If the faucet operates automatically without user interaction, then hygiene is improved, but the system complexity increases
Solution Approach 1:
The patent integrates multiple functions into a single automated control system: presence detection, temperature control, flow rate adjustment, and handwashing timing all managed by one controller. This multi-functional approach consolidates what would otherwise require separate mechanisms, reducing overall system complexity while maintaining comprehensive automatic operation for hygiene purposes.
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
Ensures accurate detection of user presence, adjusts water temperature to a desired setting, and guides proper handwashing, thereby reducing energy and water consumption.
Implementation Method 1
Automatic faucets may employ infrared or capacitive proximity sensors to determine the presence of a person desirous of washing their hands
Implementation Method 2
Automatic faucets may employ infrared or capacitive proximity sensors to determine the presence of a person desirous of washing their hands
Data Source
AI summary
An automatic faucet assembly comprising a presence sensor and a temperature control assembly. A temperature control assembly may be coupled to a faucet body. An automatic faucet may comprise a digital display surface configured to display dispensed water temperature in real time and dispensed water time. A display surface may display steps for proper handwashing.