Indoor Unit Address Setting Under Noisy Signal Conditions
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Solution Overview
Problem
Conventional air conditioners face prolonged address setting times and failure due to signal disturbances like noise or ringing during the address setting process, leading to repeated retries and potential inability to complete address setting when disturbances are continuous.
Innovation Solution
The air conditioner employs a control portion that transmits detection commands in a predetermined order to indoor units, with the ability to repeat the same command and change the detection command recognition method if no response is received, allowing for quicker and more secure address setting by starting over from the preceding digit rather than the initial digit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the address setting starts over by returning to the initial digit when no response is received, then the address setting can be redone, but the time required for address setting increases significantly
Solution Approach 1:
The system performs preliminary actions by transmitting the same detection command multiple times before giving up on a digit position. This allows the system to exhaust retry opportunities at the current digit level before returning to the initial digit, thereby reducing unnecessary full restarts and shortening overall address setting time.
Solution Approach 2:
When a response is received at a later digit position, the system skips re-transmitting commands for previous digit positions and proceeds directly to address setting. This rushing through of already-successful digit positions significantly reduces the time required for address setting while maintaining reliability.
2Reliability
If the address setting repeatedly returns to the initial digit due to signal disturbance, then the system can retry, but the address setting cannot be completed when disturbance is continuous
Solution Approach 1:
The system performs preliminary transmissions of the same detection command multiple times (e.g., 3 times) before considering a digit position failed. This preliminary action reduces the frequency of returning to the initial digit, improving address setting completion rates under continuous disturbance while maintaining reasonable retry capability.
Solution Approach 2:
When progress is made at any digit position, the system skips re-attempting previous positions and rushes through to complete address setting. This approach prevents infinite loops in continuous disturbance scenarios, ensuring eventual completion while maintaining efficiency.
3Ease of operation
If the system transmits detection commands sequentially in predetermined order, then the address setting process is systematic, but the time required increases when retries are needed
Solution Approach 1:
The system performs preliminary multiple transmissions of the same detection command before moving to the next digit position or declaring failure. This maintains the systematic sequential approach while reducing the need for full restarts, thereby shortening overall time without compromising operational simplicity.
Solution Approach 2:
When a response is successfully received at any digit position, the system skips re-transmitting commands for previous positions and rushes through the remaining steps. This maintains systematic operation for failed attempts while dramatically reducing time for successful progress points.
Data Source
AI summary
A serial number detection portion simultaneously transmits a detection command for requesting a first digit of a serial number to plurality of indoor units, and the serial number detection portion simultaneously transmits a detection command for requesting a second digit immediately preceding the first digit to the indoor units when a response to the detection command is absent. That is, the address setting is performed again from the immediately preceding digit without returning to an initial digit of the serial number, so that the time necessary for the address setting can be shortened. When the address setting is performed again from the immediately preceding digit, the address setting can be performed more securely by changing a method of recognizing the detection command in the indoor units.