Predictive Wireless Sensor Transmission for Building Control
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Solution Overview
Problem
Conventional methods for transmitting data from wireless sensors in building management systems consume significant battery life, leading to short operational durations and potential control performance degradation due to frequent transmissions.
Innovation Solution
Implementing a system where wireless measurement devices predict future values of environmental variables and transmit these predictions along with current values at extended intervals, reducing the frequency of transmissions while maintaining control algorithm responsiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wireless sensors transmit data frequently to maintain responsive control, then control performance is improved, but battery life diminishes quickly
Solution Approach 1:
The sensor performs preliminary measurements and stores multiple values locally before transmission. By pre-collecting data and predicting future values, the sensor reduces the frequency of transmissions while ensuring control performance is maintained through predictive algorithms that anticipate future environmental conditions.
Solution Approach 2:
Instead of transmitting every measured value, the system creates a simplified representation by transmitting only predicted future values and key current measurements. This copying approach reduces data traffic and transmission frequency while preserving the essential information needed for control decisions.
2Duration of action of moving object
If transmission interval is extended to conserve battery power, then battery life is improved, but data transmission frequency decreases
Solution Approach 1:
The system changes the temporal parameters of data transmission by extending the transmission interval while compensating through predictive algorithms. The sensor transmits data less frequently but provides predicted values that cover the extended time period, maintaining productivity without increasing power consumption.
3Measurement precision
If measurement interval is shortened to improve prediction accuracy, then prediction precision is improved, but power consumption increases
Solution Approach 1:
The sensor performs measurements at a moderate interval and uses predictive algorithms to generate additional predicted values. This partial action approach achieves the effect of higher measurement frequency (improved prediction accuracy) without actually increasing the physical measurement rate, thus avoiding the associated power consumption increase.
Data Source
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AI summary
A building control system includes a wireless measurement device and a controller. The wireless measurement device measures a plurality of values of an environmental variable and uses the plurality of measured values to predict one or more future values of the environmental variable. The wireless device periodically transmits, at a transmission interval, a message that includes a current value of the environmental variable and the one or more predicted values of the environmental variable. The controller receives the message from the wireless device and parses the message to extract the current value and the one or more predicted future values of the environmental variable. The controller periodically and sequentially applies, at a controller update interval shorter than the transmission interval, each of the extracted values as an input to a control algorithm that operates to control the environmental variable.