Method and Apparatus for Controlling Fresh Air System, and Air-Conditioning Unit
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Solution Overview
Problem
Existing fresh air systems require two photoelectric switches to accurately detect the switch position of air valves, leading to resource waste and short service life of mechanical switches.
Innovation Solution
A method and apparatus using a single photoelectric switch to detect the switch state of air valves in a fresh air system by analyzing voltage signals for level changes and final level states, determining if the valves are fully opened or closed, and controlling the system accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If two photoelectric switches are used to detect air valve positions, then measurement precision is improved, but device complexity and resource waste increase
Solution Approach 1:
The patent combines the detection functions of two separate photoelectric switches into a single photoelectric switch by integrating multiple detection barriers (open position barrier and closed position barrier) that work sequentially with one switch to determine valve position states
Solution Approach 2:
The detection process is segmented into multiple level change events (first level change at open barrier, second level change at closed barrier) that are analyzed in sequence to determine the valve's switch position, allowing one photoelectric switch to perform what previously required two
2Device complexity
If mechanical switches are used to detect air valve positions, then device complexity is reduced, but reliability and service life deteriorate
Solution Approach 1:
The patent replaces mechanical switch mechanisms with a photoelectric detection system that uses light barriers and a photoelectric switch, eliminating mechanical contact and wear while maintaining detection functionality, thereby improving reliability and service life
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
Accurately detects the switch position of air valves with a single photoelectric switch, addressing resource waste and improving switch longevity while ensuring precise operation.
Implementation Method 1
a photoelectric detection is also used to check whether an air valve is switched in place
Data Source
AI summary
A method and apparatus for controlling a fresh air system, and an air conditioning unit. The method includes acquiring the opening state of an air valve; and detecting a voltage signal of a photoelectric switch. The voltage signal includes at least the number of changes in a level, and a final level state; and determining, according to the voltage signal, whether the air valve has been fully opened/closed, and controlling the operation of a fresh air system according to a determination result.