Field Device Data Transmission Using Change-and-Slope Thresholds
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Solution Overview
Problem
Existing methods for reducing data transmission in field devices are inefficient, leading to excessive energy consumption and information loss, particularly in scenarios where process variables remain constant or change slowly, as they either require high energy for frequent transmissions or result in poor resolution due to infrequent updates.
Innovation Solution
A method that adjusts data transmission based on the magnitude and slope of differences in process variable values, transmitting only when significant changes occur, using a variable transmission rate that minimizes energy usage while maintaining accurate representation of process variable curves, by comparing current values with previous ones and determining transmission based on predetermined thresholds and gradients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If data transmission rate is increased to maintain accurate process variable curves, then information accuracy is improved, but energy consumption increases
Solution Approach 1:
The patent applies dynamics by making the data transmission rate variable rather than constant. The transmission rate adapts dynamically based on the actual changes in process variables - increasing transmission frequency when process variables change significantly and reducing it when variables remain stable, thereby optimizing the balance between information accuracy and energy consumption
Solution Approach 2:
The patent changes the parameter of transmission rate from a fixed value to a variable that depends on process variable characteristics. By monitoring the magnitude and rate of change of process variables, the system adjusts transmission parameters (time intervals, data volume) to match actual process conditions, reducing unnecessary transmissions during stable periods
2Use of energy by moving object
If data transmission rate is decreased to reduce energy consumption, then energy usage is optimized, but information resolution deteriorates
Solution Approach 1:
The system dynamically adjusts transmission frequency based on process variable behavior. When process variables exhibit significant changes or high rates of change, the transmission rate automatically increases to maintain information resolution. When variables remain stable, transmission rate decreases to save energy, thus adaptively optimizing both energy usage and information quality
Solution Approach 2:
The transmission parameters (time intervals, data volume) are changed based on process variable characteristics. The system monitors process variable changes and adjusts transmission parameters accordingly - using larger time intervals during stable periods and smaller intervals during changing periods, thereby optimizing energy consumption while maintaining necessary information resolution
3Loss of information
If constant high transmission rate is used to trace process changes accurately, then information accuracy is improved, but energy consumption increases significantly
Solution Approach 1:
The patent replaces constant high transmission rate with a dynamic transmission rate that responds to actual process conditions. The system continuously monitors process variable changes and adjusts transmission frequency in real-time, maintaining high transmission rates only when process variables are changing significantly, thereby reducing overall energy consumption while preserving the ability to trace important process changes
Solution Approach 2:
The transmission parameters are changed based on process variable characteristics. The system uses thresholds and rates of change to determine when high-resolution transmission is necessary, adjusting transmission parameters (frequency, detail level) to match actual process dynamics, thus avoiding unnecessary high-rate transmissions during stable periods
Data Source
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Figure 3a~3b
AI summary
The invention relates to a method for reducing a volume of data to be transmitted from a field device (FG), wherein the field device (FG) captures values of at least one process variable (h), wherein the field device (FG) is communicatively connected to a network subscriber (BE, GW) via a communication network and is configured to transmit the captured values of the process variables (h) to the network subscriber (BE, GW), wherein a check on the present value of the process variable (h) takes place at stipulated times (t), which stipulated times (t) have in particular a constant time difference in relation to one another, wherein in the course of the check a value of the process variable (h (t1)) at a first time (t1), which first time corresponds to the time of the check, is compared with the value of the process variable (h (t2)) from a second time (t2), wherein the second time (t2) is the time before the first time (t1), and wherein the value (h (t1)) of the process variable (h) from the first time (t1) is transmitted only when the absolute value of the difference between the value (h(t1)) of the process variable (h) from the first time (t1) and the value (h (t2)) of the process variable (h) from the second time (t2) is greater than or equal to a predetermined first absolute value (Ah(t1)), characterized in that the value (h(t1)) of the process variable (h) from the first time (t1) is transmitted only if additionally the absolute value of the difference between the value (h (t1)) of the process variable (h) from the first time (t1) and the value (h (t2)) of the process variable (h) from the second time (t2) differs from an absolute value of a difference between the value (h (t2)) of the process variable (h) from the second time (T2) and a value (h (t3)) of the process variable (h) from a third time (t3), which third time (t3) is the time before the second time (t2), at least by a predetermined factor.