Wireless Sensor Communication Control for Low-Power Event Detection
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Solution Overview
Problem
Conventional abnormality detection devices in plants face increased power consumption when continuously monitoring facilities, which can lead to reduced battery life and missed instantaneous changes in measurement targets, especially when they require wireless communication and lack a power source line.
Innovation Solution
A wireless communication device with a determination unit that activates and deactivates the wireless communication unit based on predetermined conditions, allowing power-saving by stopping operations until a measurement result satisfies a set condition, and periodically transmitting data to ensure detection of instantaneous changes without continuous power use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous monitoring is performed to detect instantaneous changes, then detection reliability is improved, but power consumption increases
Solution Approach 1:
The wireless communication unit operates periodically rather than continuously, with the controller activating it at predetermined intervals to transmit measurement results. This periodic operation reduces power consumption while maintaining the ability to detect instantaneous changes through conditional triggering when measurement values exceed thresholds.
Solution Approach 2:
The system uses feedback from the measurement unit to trigger wireless communication only when necessary. The controller monitors measurement results and activates the wireless communication unit based on whether the measurement value satisfies a predetermined condition, creating a feedback-driven operation mode that balances detection reliability with power saving.
2Reliability
If wireless communication is continuously activated to transmit data, then data transmission reliability is improved, but battery life is reduced
Solution Approach 1:
The wireless communication unit is activated periodically by the controller rather than remaining continuously active. This periodic activation extends battery life by reducing the operational time of the power-consuming wireless communication component while maintaining data transmission capability through conditional triggering.
Solution Approach 2:
The measurement unit continuously monitors the measurement target and automatically triggers the wireless communication unit when a predetermined condition is met, without requiring continuous controller intervention. This self-service mechanism ensures data transmission reliability while minimizing power consumption by activating communication only when necessary.
3Use of energy by moving object
If the wireless communication unit is stopped to save power, then power consumption is reduced, but instantaneous changes may be missed
Solution Approach 1:
The controller receives feedback from the measurement unit about measurement results and uses this feedback to determine when to activate the wireless communication unit. This feedback mechanism ensures that instantaneous changes are detected and transmitted even when the communication unit is mostly stopped for power saving.
Solution Approach 2:
The measurement unit continuously monitors the measurement target in advance, preparing measurement results ready for transmission. When a predetermined condition is satisfied, the controller immediately activates the wireless communication unit to transmit the pre-prepared measurement result, ensuring no instantaneous changes are missed despite the communication unit being stopped most of the time.
Data Source
AI summary
This wireless communication device includes: a wireless communication unit of which operation is allowed to be activated and stopped; a determination unit configured to determine whether or not a measurement result by a sensor satisfies a predetermined condition; and a controller configured to perform control of, when the determination unit has determined that the predetermined condition has been satisfied, activating the wireless communication unit of which operation has been stopped, and causing the wireless communication unit to transmit the measurement result or a determination result by the determination unit.