Air-conditioning device
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Solution Overview
Problem
Air-conditioning devices face issues when a wireless temperature sensor unit is installed inappropriately or fails, leading to inaccurate temperature measurements, which can result in inadequate conditioning of indoor air and potential device overload or breakdown.
Innovation Solution
An air-conditioning device with a suction air temperature sensor and a wireless temperature sensor unit that includes an ambient temperature sensor and transmitter, along with an abnormal condition determining section to assess the sensor unit's status and switch to using the suction air temperature sensor's measurement if the wireless sensor is in an abnormal condition, ensuring proper air conditioning of the entire indoor space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a wireless temperature sensor unit is installed at an optional location to measure ambient temperature, then air at that optional location can be conditioned, but the measurement value may be inaccurate if the sensor is installed inappropriately (e.g., near other heaters)
Solution Approach 1:
The system performs preliminary actions by detecting the presence of the wireless temperature sensor unit and evaluating its measurement values before using them for control. The abnormal condition determining section preemptively identifies potential measurement errors by comparing sensor readings with expected ranges or patterns, allowing the system to prepare alternative measurement strategies in advance.
Solution Approach 2:
The system implements feedback by continuously monitoring the measurement values from the wireless temperature sensor unit and comparing them against reference values or expected ranges. The abnormal condition determining section uses this feedback to detect when the sensor is in an abnormal condition (e.g., installed near heaters), and the index setting section adjusts the temperature index value accordingly to compensate for measurement errors.
2Ease of operation
If the wireless temperature sensor unit is used to control air-conditioning operation, then comfort is improved by measuring temperature near occupants, but the system becomes uncontrollable or conditions air improperly if the sensor fails (e.g., dead battery)
Solution Approach 1:
The system provides beforehand cushioning by establishing a backup mechanism through the abnormal condition determining section. This section continuously evaluates the reliability of the wireless temperature sensor unit and prepares alternative control strategies in advance. When sensor failure is detected (such as dead battery), the system has already prepared fallback methods to maintain controllability, preventing complete system failure.
Solution Approach 2:
The system applies parameter changes by dynamically adjusting the temperature index value based on the operational status of the wireless temperature sensor unit. When the sensor is functioning normally, the system uses its measurement values for precise comfort control. When abnormal conditions are detected, the system changes the parameter (temperature index value) to compensate for measurement errors or uses alternative control modes, maintaining system reliability throughout.
3Manufacturing precision
If the ambient temperature sensor measurement value is used for control, then air conditioning at the specific location is optimized, but air in the entire indoor space may be improperly conditioned if the sensor is in abnormal condition
Solution Approach 1:
The abnormal condition determining section acts as an intermediary between the ambient temperature sensor and the control system. It evaluates the reliability of sensor measurements and mediates by adjusting the temperature index value or triggering alternative control strategies when abnormal conditions are detected. This intermediary function prevents improper conditioning of the entire indoor space by blocking potentially erroneous control commands while maintaining precise local temperature control when sensors are functioning properly.
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
This solution allows for appropriate air conditioning of the entire indoor space even if the wireless temperature sensor unit is in an abnormal condition, preventing overheating or overcooling and reducing the risk of device breakdown.
Implementation Method 1
an ambient temperature sensor (13b) measuring an ambient temperature
Implementation Method 2
a suction air temperature sensor (61) provided in the indoor unit (12) to measure the temperature of the indoor air drawn into the indoor unit (12)
Implementation Method 3
a transmitter (13c) transmitting a signal of a measurement value (Tm2) of the ambient temperature sensor (13b) by radio
Data Source
AI summary
An air-conditioning device includes: a suction air temperature sensor provided in an indoor unit; a wireless temperature sensor unit separate from the indoor unit; an abnormal condition determining section determining whether or not the wireless temperature sensor unit is in an abnormal condition; an index setting section setting a temperature index value; and a controller controlling operation of the air-conditioning device based on the set temperature index value. While the abnormal condition determining section determines that the wireless temperature sensor unit is in the abnormal condition, the index setting section determines a measurement value of the suction air temperature sensor to be the temperature index value.