Outdoor Unit Contactless Setting with Time-Based Access Control
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Solution Overview
Problem
The outdoor unit of air conditioning systems is vulnerable to unauthorized changes in preset data due to its outdoor installation, which can be accessed by anyone, compromising security and reliability.
Innovation Solution
An outdoor unit setting system that employs contactless communication between a first communication unit in the outdoor unit and a second communication unit in an information terminal, where the outdoor unit notifies time information and restriction states, allowing settings only within a certain time frame to prevent unauthorized access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the outdoor unit is installed outdoors for easy access and operation, then the ease of operation is improved, but the security against unauthorized changes deteriorates
Solution Approach 1:
The system performs preliminary authentication and time-based permission setting before allowing any data changes. The outdoor unit notifies time information to the information terminal in advance, and the terminal controller uses this to determine whether setting is permitted before any modification occurs, preventing unauthorized changes while maintaining accessibility
Solution Approach 2:
The information terminal acts as an intermediary between the outdoor unit and the user. It receives time information from the outdoor unit, determines whether setting is permitted based on the elapsed time, and only then allows setting operations. This intermediary layer prevents direct unauthorized access to the outdoor unit's data
2Ease of operation
If contactless communication is enabled for convenient setting, then the ease of operation is improved, but the vulnerability to unauthorized access increases
Solution Approach 1:
The setting permission is made dynamic rather than static. The outdoor unit notifies time information, and the information terminal controller dynamically determines whether setting is permitted based on the elapsed time from power application. This dynamic time-based permission system allows convenient contactless operation for authorized users while automatically preventing unauthorized access after the time window closes
Solution Approach 2:
The outdoor unit provides feedback in the form of time information to the information terminal. The terminal controller uses this feedback to determine whether setting is permitted, creating a closed-loop control system that automatically prevents unauthorized changes based on the elapsed time condition
Data Source
Figure 1
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AI summary
According to one embodiment, an outdoor unit setting system includes an outdoor unit comprising a first communication unit, and an information terminal comprising a second communication unit, and makes a setting of the outdoor unit by contactless communication between the first communication unit and the second communication unit. The outdoor unit includes a first controller which notifies time information related to time elapsed from application of power to the outdoor unit, to the information terminal by the contactless communication. The information terminal includes a second controller which permits the setting of the outdoor unit made by the information terminal during a period until the elapsed time reaches certain time based on the time information notified from the outdoor unit.