Air-conditioning control system and air-conditioning equipment
Solution Overview
Problem
Air-conditioning equipment with particle sensors may fail to effectively clean indoor air due to sensor deterioration, leading to reduced confidence in the system's performance.
Innovation Solution
An air-conditioning control system that includes a particle sensor, a controller, and ventilation control mechanisms to reduce particle levels, allowing for detection value correction and threshold adjustment based on a reference value, thereby mitigating the impact of sensor deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a particle sensor is used to detect particles in the enclosure, then air cleaning function can be monitored, but the sensor deteriorates over time leading to inaccurate detection
Solution Approach 1:
The system performs preliminary calibration by reducing particles in the predetermined region before acquiring a detection value. This preliminary action establishes a baseline measurement under controlled conditions (with minimal particles) to account for sensor characteristics, which is then used to correct subsequent measurements. The controller switches to a second state where particles are reduced to less than in the first state, acquires a detection value, and determines a correction value based on this calibrated measurement.
2Measurement precision
If particles are reduced in the predetermined region to calibrate the sensor, then detection accuracy improves, but the air cleaning monitoring function is temporarily affected
Solution Approach 1:
The system implements periodic calibration by switching between first and second states at predetermined intervals. The controller periodically switches to the second state to reduce particles and perform calibration, then returns to the first state for normal air cleaning monitoring. This periodic action allows the system to maintain accurate sensor measurements over time while minimizing disruption to the primary air cleaning function.
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
The system effectively prevents a decrease in confidence by accurately assessing and correcting for sensor deterioration, ensuring reliable air cleaning performance.
Implementation Method 1
a particle sensor configured to detect particles existing in a predetermined region in the enclosure
Data Source
AI summary
An air-conditioning control system includes: an enclosure with a ventilation opening; a particle sensor detecting particles; and a controller. The controller controls an amount of particles in a predetermined region, is switchable between first and second states, an amount of particles is controlled such that in the second state the particles existing in the predetermined region are reduced to be less than in the first, compares a detection value acquired from the particle sensor and a threshold in a case of the first state, performs a predetermined process based on the comparison, and in response to predetermined conditions being satisfied when in the second state, (a) acquires the detection value from the particle sensor, (b) determines a correction value based on the acquired detection value and a reference value, and (c) corrects, as targets for the comparison, either the threshold or the detection value, by using the correction value.