Wireless Thermostat Authentication for Secure Multi-Zone HVAC Control
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Solution Overview
Problem
Existing wireless HVAC systems face issues with bulky designs, inadequate securement mechanisms, and incomplete temperature measurement across multiple zones, leading to inefficient control and potential unauthorized access.
Innovation Solution
A wireless temperature control unit with a compact design, featuring a microcontroller, temperature and humidity sensors, accelerometer, and near-field communication, which pairs with smartphones for secure, remote access and control, using the 2.4 GHz ISM radio band, and integrates with existing HVAC systems for universal control and security through a local DHCP web server.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wireless thermostats are placed in accessible locations for user control, then ease of operation is improved, but security against unauthorized access deteriorates
Solution Approach 1:
The patent replaces mechanical key-based locking systems with electronic authentication mechanisms. The thermostat uses wireless communication protocols and electronic authentication to verify user identity, eliminating the need for physical keys while maintaining security. This allows remote access control through authorized devices while preventing unauthorized manipulation.
Solution Approach 2:
The patent introduces an intermediary authentication system between the user and the thermostat controls. A microprocessor-based authentication module verifies user credentials before allowing access to temperature control functions, acting as a mediator that enables convenient access for authorized users while blocking unauthorized access attempts.
2Measurement precision
If multiple temperature sensors are deployed across different zones, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent divides the HVAC monitoring system into multiple independent temperature sensing zones, each with its own sensor and identification. Each zone operates independently but reports to a central control algorithm, allowing precise temperature measurement across different areas without creating a single complex centralized sensing system.
Solution Approach 2:
The patent employs a universal temperature sensing module that can be deployed in multiple zones with identical hardware design. Each sensor unit performs the same function (temperature measurement) but serves different spatial zones, reducing overall system complexity through standardization while maintaining comprehensive temperature monitoring capability.
3Productivity
If learning algorithms are built into the thermostat, then productivity is improved, but device complexity increases
Solution Approach 1:
The patent extracts the complex learning algorithm functionality from the wall-mounted thermostat unit and relocates it to a remote microprocessor-based controller. The thermostat itself retains only basic temperature sensing and control functions, while the sophisticated learning and optimization algorithms execute remotely, reducing the complexity of the physical thermostat device.
Solution Approach 2:
The patent introduces a remote microprocessor-based controller as an intermediary between the thermostat and the learning algorithm. This separate computational unit handles the complex data processing and pattern recognition, allowing the thermostat to remain relatively simple while still benefiting from advanced productivity-enhancing algorithms through wireless communication.
Data Source
AI summary
A secure wireless thermostat and system comprising the thermostat are described and taught. The temperature control unit replaces the traditional thermostat by attaching to the wall and using the existing wiring from the traditional thermostat. This temperature control unit has no display or programming buttons, rather a user interacts with the temperature control unit via electronic devices such as smart phones, laptop computers, and desktop computers. The settings of the system can be modified by the user from these access ports. If the user opts to interact with the system via a third party IP server, a local DHCP web server can be employed to store data safely and securely.