In-Vehicle Ethernet Priority Mapping for Low-Latency Safety Signals
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Solution Overview
Problem
In-vehicle Ethernet network systems experience high latency in transmitting safety-related Ethernet signals, potentially causing safety issues due to the characteristics of Ethernet communication.
Innovation Solution
A method for controlling an in-vehicle network that involves receiving a CAN signal, converting it into an Ethernet signal with priority information based on vehicle status, and transmitting the converted signal through Ethernet communication, using a priority code point (PCP) table to manage priority levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If Ethernet communication is used for in-vehicle networks, then network bandwidth and data transmission capability are improved, but transmission latency increases for safety-related signals
Solution Approach 1:
The patent dynamically changes the PCP priority parameter based on vehicle status. When safety-related CAN signals are converted to Ethernet signals, the system adjusts the PCP value according to the current vehicle operation state, ensuring that critical safety data receives higher priority transmission channels, thus reducing latency while maintaining high bandwidth utilization
2Loss of time
If static network configuration is used, then transmission latency is reduced, but network adaptability to different vehicle statuses deteriorates
Solution Approach 1:
The patent implements a dynamic priority assignment mechanism where the PCP value is not fixed but changes based on vehicle status. The system continuously monitors vehicle operation states and adjusts the priority of Ethernet signals accordingly, allowing the network to adapt dynamically to different driving conditions while maintaining low latency for safety-critical communications
3Adaptability or versatility
If CAN signals are converted to Ethernet signals without priority information, then protocol compatibility is improved, but transmission priority control is lost
Solution Approach 1:
The patent uses the PCP field as an intermediary mechanism during CAN-to-Ethernet signal conversion. The conversion process maps CAN signal priorities to corresponding PCP values, acting as a mediator that preserves priority information through the protocol transition. This allows Ethernet networks to maintain the priority control capabilities inherent in CAN systems while benefiting from Ethernet's higher bandwidth and compatibility
Data Source
AI summary
The present disclosure is proposed to solve above-described problems and various problems associated thereto, and may provide a control method for a network in a vehicle, comprising the steps wherein: a first node in the vehicle receives a first controller area network (CAN) signal from a first sensor of the first node through CAN communication; the first node converts the first CAN signal into a first Ethernet signal including different pieces of priory information according to vehicle states; and the first node transmits the first Ethernet signal to a second node in the vehicle through Ethernet communication.