On-Vehicle Switch Device Dynamic Output Rate Control
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Solution Overview
Problem
On-vehicle network systems face challenges in efficiently relaying data while preventing data loss, particularly in congested states where the remaining capacity of RAM is scarce, leading to potential data loss and prolonged relay processing times even in non-congested states.
Innovation Solution
A switch device equipped with a processing section that adjusts output rates based on transmission source addresses, lowering rates when addresses are different to prevent data loss and raising rates when addresses are the same to optimize relay processing, and transmits instructions regarding transmission timing to manage congestion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the processing section maintains high output rates for all frames, then relay processing speed is improved, but data loss occurs in congested states when multiple frames with different transmission source addresses are present
Solution Approach 1:
The processing section dynamically adjusts the output rate of frames based on the detection of congestion conditions. When multiple frames with different transmission source addresses are detected, the system transitions from a high-speed constant output mode to a controlled lower output rate mode, preventing buffer overflow and data loss while maintaining efficient processing when possible.
Solution Approach 2:
The system changes the output rate parameter adaptively based on the state of the processing section. By monitoring whether multiple frames from different transmission sources are present, the processing section modifies the output rate parameter to either maintain high speed (single source) or reduce speed (multiple sources), thereby resolving the contradiction between speed and reliability.
2Reliability
If the processing section lowers output rates to prevent data loss, then reliability is improved, but relay processing time increases in non-congested states
Solution Approach 1:
The output rate is dynamically adjusted based on real-time detection of congestion conditions. The system operates at high output rates during normal (non-congested) states to minimize processing time, and automatically reduces the output rate only when congestion is detected (multiple frames from different transmission sources), thus preventing unnecessary time loss while maintaining reliability when needed.
3Productivity
If the processing section processes multiple frames from different transmission sources simultaneously, then productivity is improved, but the remaining capacity of RAM becomes scarce leading to data loss
Solution Approach 1:
The system allows partial simultaneous processing of multiple frames from different transmission sources by controlling the output rate. Rather than completely blocking multi-source frames, the processing section processes them at a reduced rate that prevents RAM buffer overflow, thereby maintaining some productivity while preventing data loss due to excessive RAM usage.
Data Source
AI summary
A switch device for relaying data in an on-vehicle network, being equipped with a switch section and a processing section for performing the relay processing via the switch section, wherein, in the case that a plurality of frames to be subjected to the relay processing is present in the processing section, the processing section performs adjustment processing so that the output rates of the respective frames to the switch section in the case that the transmission source addresses of the respective frames are different are made smaller than the output rate in the case that the transmission source addresses of the respective frames are the same.