Control Apparatus Adjusting Transmission Interval for Networked Device Stability
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Solution Overview
Problem
Networked control systems face instability due to communication delay times caused by factors like cross traffic and radio wave interference, which are not effectively optimized by existing techniques, leading to unpredictable control of devices.
Innovation Solution
A control apparatus and method that calculates communication delay time by measuring the difference between control signal transmission and reply signal reception times, adjusting the transmission interval to optimize the sum of transmission interval and communication delay time, ensuring stable device control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the transmission interval is shortened to improve control precision, then control precision is improved, but communication delay time increases causing system instability
Solution Approach 1:
The patent applies dynamics by making the transmission interval adjustable rather than fixed. The control apparatus dynamically changes the transmission interval based on the measured communication delay time, allowing the system to adapt to varying network conditions. This resolves the contradiction by enabling the transmission interval to be optimized in real-time - shortened when delay is low for precision, and lengthened when delay is high for stability.
Solution Approach 2:
The patent implements feedback by measuring the communication delay time and using this information to adjust the transmission interval. The control apparatus receives reply signals from the to-be-controlled device, calculates the round-trip delay, and feeds this information back into the transmission interval adjustment logic. This closed-loop feedback mechanism allows the system to automatically balance precision and stability based on actual communication conditions.
2Reliability
If the transmission interval is lengthened to reduce communication delay, then system stability is improved, but control precision deteriorates
Solution Approach 1:
The system dynamically adjusts the transmission interval based on measured communication delay conditions. When communication delay is low, the transmission interval is shortened to improve control precision. When communication delay is high, the transmission interval is lengthened to maintain system stability. This dynamic adjustment resolves the contradiction between stability and precision.
Solution Approach 2:
The patent changes the transmission interval parameter based on the communication delay time measurement. By adjusting this key parameter in response to measured conditions, the system optimizes the balance between stability and precision. The transmission interval is not fixed but is modified according to the measured delay, allowing the system to achieve both stability and precision under different operating conditions.
Data Source
AI summary
In order to realize a control apparatus capable of stably controlling a to-be-controlled device, a to-be-controlled device, a control system, a control method, a method for controlling a to-be-controlled device, a program for a control apparatus, and a program for a to-be-controlled device, a control apparatus according to the present invention is provided with: a transmission means for transmitting a control signal at a prescribed transmission interval to a to-be-controlled device that sends out a reply signal upon receipt of the control signal; a reception means for receiving the reply signal; and a control means for calculating a communication delay time from the difference between a transmission time of the control signal and a reception time of the reply signal, and then changing the prescribed transmission interval such that the sum of the prescribed transmission interval and the communication delay time satisfies a prescribed condition.