Time Synchronization Device for Control Networks
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Solution Overview
Problem
Current methods for time synchronization in low-end control devices are inefficient, inaccurate, and costly, particularly in large, distributed automation environments, as they rely on manual processes that can introduce significant errors.
Innovation Solution
A method using a mobile handheld device to select a second device based on network topology, sending packets and delay requests to determine forward and backward times, calculating correction factors, and applying these to synchronize clocks, with the option for backup devices to ensure continuous synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If manual time synchronization method is used for low-end control devices, then cost is reduced, but time synchronization accuracy deteriorates (errors range from milliseconds to seconds)
Solution Approach 1:
The patent introduces an intermediary time synchronization device that acts as a mediator between the control network and low-end control devices. This device receives time reference signals from the control network, calculates correction factors, and transmits corrected time values to multiple control devices simultaneously, thereby achieving accurate synchronization without requiring expensive equipment at each control device location.
Solution Approach 2:
The patent creates a copied time synchronization system where a single time synchronization device replicates the time reference signal to multiple control devices. Instead of each device having its own expensive synchronization equipment, one device copies and distributes the time reference, significantly reducing overall system cost while maintaining synchronization accuracy.
2Ease of manufacture
If manual time synchronization method is used, then equipment cost is reduced, but time consumption increases (especially when large number of devices are distributed over large area)
Solution Approach 1:
The patent merges the time synchronization function into a single centralized device that can simultaneously synchronize multiple control devices. Instead of manually connecting each device individually, the time synchronization device combines multiple synchronization operations into one automated process, dramatically reducing the time required to synchronize large numbers of distributed devices.
Solution Approach 2:
The time synchronization device operates autonomously by automatically receiving time reference signals from the control network, calculating correction factors, and transmitting synchronized time values to control devices without requiring manual intervention. This self-service capability eliminates the time-consuming manual configuration process.
3Measurement precision
If advanced time synchronization protocols are used, then time synchronization accuracy is improved, but device complexity increases (requiring time stamping at network interface hardware, master clock, boundary clocks)
Solution Approach 1:
The patent extracts the complex time synchronization processing functions (time stamping, correction factor calculation, protocol management) from individual control devices and concentrates them in a dedicated time synchronization device. This allows low-end control devices to remain simple while still achieving accurate synchronization through the external synchronization device.
Solution Approach 2:
The time synchronization device serves multiple functions: it acts as a time reference receiver, a correction factor calculator, a communication interface, and a distributor to multiple control devices. This multi-functional design consolidates what would otherwise require separate complex components at each device into a single universal synchronization unit.
Data Source
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AI summary
The present invention provides a method for time synchronizing one or more devices in a control network using a first device. The method comprises selecting a first device from information of the topology of the control network. The method further comprises sending a first set of packets to the second device, receiving a first set of delay requests in response to the first set of packets, and sending a first set of delay responses in response to the first set of delay requests. The method further comprises, determining a first set of forward times and first set of backward times. The method further comprises, determining a first minimum forward time and a first minimum backward time. Further the method comprises determining a first correction factor. The method also comprises, applying the first correction factor to a clock provided at the second device and storing the first correction factor.