Time-Triggered Bus Controller for Deterministic Industrial Data Transmission
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Solution Overview
Problem
Current industry control systems face issues with low performance, poor reliability, and non-real-time data transmission due to the complexity and cost of serial bus systems, as well as limitations in Ethernet and CAN bus technologies, which affect deterministic and timely data exchange.
Innovation Solution
Implementing a method for an industry internet field broadband bus that synchronizes bus controllers and terminals using precise clock synchronization protocols, allocates time slices for data transmission, and employs Time-Triggered Ethernet or TDMA for real-time data, while using CSMA/CD for non-real-time data, and incorporates security measures like MAC address management and data feature detection to ensure reliable and timely data transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If Ethernet operates with CSMA/CD for data transmission, then network flexibility is improved, but deterministic real-time transmission reliability deteriorates when network load exceeds 40%
Solution Approach 1:
The patent segments the transmission medium into dedicated time slots for different transmission modes. Real-time data transmission is assigned specific time slots with guaranteed bandwidth, while non-real-time data uses remaining time slots. This temporal segmentation ensures deterministic real-time transmission while maintaining network flexibility for other data types.
Solution Approach 2:
The patent dynamically changes transmission parameters including time slot allocation, bandwidth assignment, and priority levels based on real-time network conditions and data types. By adjusting these parameters, the system maintains high reliability for real-time data while preserving adaptability for varying network loads and data requirements.
2Speed
If CAN bus uses event trigger mechanism for data transmission, then system responsiveness is improved, but transmission reliability deteriorates due to easy collision between events
Solution Approach 1:
The patent implements preliminary arbitration and time slot reservation before actual data transmission. Devices that need to transmit data first register their transmission requests and are assigned specific time slots through arbitration. This preliminary action prevents collisions by ensuring that only one device transmits in each time slot, maintaining both responsiveness and reliability.
Solution Approach 2:
The patent employs periodic time slot allocation where transmission opportunities are distributed periodically among devices. This periodic structure ensures that event-triggered transmissions occur at predictable intervals with guaranteed access, eliminating random collisions while preserving the event-driven responsiveness of the CAN bus.
3Ease of operation
If master and slave stations operate freely without distinction on CAN bus, then communication simplicity is improved, but channel transmission rate deteriorates due to significant channel occupation
Solution Approach 1:
The patent introduces dynamic role assignment where devices can switch between master and slave roles based on current transmission needs and priorities. This dynamic differentiation allows high-priority devices to act as masters with guaranteed time slots, while other devices operate as slaves, thereby improving channel transmission rate while maintaining operational simplicity through automated role management.
Solution Approach 2:
The patent implements self-service arbitration where devices automatically determine their own transmission priorities and negotiate time slot allocation without external intervention. Each device assesses its own data urgency and independently secures transmission opportunities, maintaining communication simplicity while optimizing channel utilization and transmission rate.
4Reliability
If serial bus system uses multiple bus monitors for real-time data monitoring, then data reliability is improved, but system complexity and hardware cost increase significantly
Solution Approach 1:
The patent merges the monitoring function into the existing time-triggered transmission protocol and controller structures. Rather than adding separate bus monitors, the monitoring capabilities are integrated into the time slot management and data transmission control mechanisms. This approach maintains data reliability through protocol-level verification while avoiding the complexity and cost of multiple dedicated monitor devices.
Data Source
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AI summary
The invention relates to a method for implementing an industry internet field broadband bus, and in the method according to the invention, a bus controller and respective bus terminals transmit data in their respective time slices to thereby ensure timely and temporally determinist data transmission. Thus the embodiments of the invention implement a high-performance, highly reliable, and highly real-time method for implementing an industry internet field broadband bus. Moreover a transmission medium of the two-wire data transmission network can be a twisted pair or a shielded twisted pair so that the method according to the embodiment of the invention can be applicable to a traditional industry control facility using a bus, and thus can be highly universally applicable.