CAN control method performed by a CAN coordinator

Latency-Improved Plug-and-Play Vehicle CAN Control Based on Coordinator Registration Mode

This technology utilizes a coordinator on the vehicle CAN bus to collect control data counts and request conditions for each node's functions during a registration mode, allowing for the batch configuration of functional/operational conditions and message IDs for each node.

In high-traffic CAN systems, identifier priority arbitration during message collisions often leads to transmission delays or lost opportunities for lower-priority messages. Furthermore, adding new nodes capable of both transmission and reception previously required upgrading existing nodes, creating significant inconvenience.

This technology reduces transmission latency by having the coordinator count the number of responding nodes and data per function to grant transmission rights and assign IDs for general and emergency message segments. Since the coordinator only operates during registration mode and remains inactive afterward, existing CAN devices remain unchanged. Applicable to automotive electronic networks and industrial fieldbus systems, it enables plug-and-play expansion, allowing new electronic modules to be connected immediately without replacing existing nodes.

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Key Features:

• Transmitting a registration mode start message to multiple nodes within the CAN in response to entering registration mode
• Receiving response messages from nodes containing registration readiness and control data counts per function, and counting the number of responding nodes and data
• Transmitting control data transmission rights messages to responding nodes based on the counting results and receiving functional and operational condition request information
• Setting functions and operational conditions for each responding node based on the received request information and transmitting node configuration messages that assign general message segment IDs

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This invention was developed with support from the Ministry of Trade, Industry and Energy for the development of a Multi-Functional Ultra-Low Power IoT Connectivity System.

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