CAN bus transmission method based on multiple priorities

By monitoring the bus load rate in real time and dynamically adjusting the priority, the transmission delay and reliability issues in CAN bus transmission were resolved, achieving low-latency and high-reliability transmission of critical messages while ensuring system stability and security.

CN121940238APending Publication Date: 2026-04-28FORYOU GENERAL ELECTRONICS
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Patent Information

Application Number
CN202610094900.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-01-23
Publication Date
2026-04-28

AI Technical Summary

Technical Problem

Existing CAN bus transmission methods struggle to effectively manage transmission latency and reliability in complex vehicle networks. In particular, messages with high real-time requirements may experience unacceptable delays due to arbitration failures. Furthermore, existing solutions increase hardware complexity or consume main processor resources.

Method used

By monitoring the bus load rate in real time and dynamically adjusting message priorities, a temporary high-priority sending mode is entered. The idle highest-priority mailbox resources are used to temporarily increase the priority of critical messages. Combined with static resource management and dynamic priority optimization, critical messages are ensured to be sent first when the bus is congested.

Benefits of technology

It achieves low-latency and high-reliability transmission of critical messages in complex vehicle networks, while taking into account the overall stability and security level of the system and avoiding hardware complexity and resource consumption issues.

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Abstract

The invention belongs to the technical field of CAN bus communication, and provides a CAN bus transmission method based on multiple priorities, which performs dynamic priority setting, optimizes the bus bandwidth utilization rate in real time, improves the communication efficiency and ensures the transmission timeliness of key data based on the real-time bus load rate. According to the method, the temporary priority adjustment is carried out on the target message only by entering the temporary high-priority sending mode, and through temporary optimization improvement, it can be ensured that the key message preempts the bandwidth when the bus is congested, hardware resources are fully utilized, low time delay and high reliability of the key message are ensured, and meanwhile it is ensured that dynamic improvement does not endanger the highest-security-level message.
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