Fuse State-Aware Communication Diagnostics for Control Networks
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Solution Overview
Problem
In communication systems with multiple electronic control devices that use electronic fuses to switch power sources, there is a difficulty in accurately detecting communication interruptions, leading to deteriorated abnormality detection accuracy.
Innovation Solution
A communication system is designed with a first control device and a second control device, both receiving power through electronic fuses, and a management device that facilitates data communication between them. The system includes a switching control section for managing the electronic fuses, a diagnostic information storage section, and a state information storage section that references the state of the first electronic fuse to invalidate diagnostic information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If electronic fuses are used to switch power sources for multiple control devices, then power management control is improved, but communication abnormality detection accuracy deteriorates due to false detection of communication interruptions
Solution Approach 1:
The management device acts as an intermediary between control devices to coordinate fuse switching operations and communication monitoring. When the management device switches an electronic fuse, it notifies relevant control devices, which then invalidate their diagnostic information to prevent false abnormality detections, thus resolving the contradiction between power management control and detection accuracy
Solution Approach 2:
Diagnostic information is invalidated in advance when fuse switching is detected, before actual communication interruptions occur. This preliminary invalidation prevents false detection of communication abnormalities that would otherwise occur due to expected communication pauses during fuse switching operations
2Reliability
If diagnostic information is continuously monitored for communication abnormalities, then abnormality detection capability is improved, but false detection increases due to fuse switching operations
Solution Approach 1:
The system implements feedback mechanisms where the management device notifies control devices about fuse switching operations. Control devices receive this feedback and respond by invalidating their diagnostic information accordingly, creating a closed-loop system that prevents false detections while maintaining reliable abnormality detection capability
Solution Approach 2:
Diagnostic information is invalidated in advance when fuse switching is detected, before actual communication interruptions occur. This preliminary invalidation prevents false detection of communication abnormalities that would otherwise occur due to expected communication pauses during fuse switching operations
Data Source
AI summary
A communication system includes a first control device that receives a power supply from a power source via a first electronic fuse, a second control device that is data-communicably connected to the first control device and receives a power supply from the power source via a second electronic fuse, a management device that is data-communicably connected between the first control device and the second control device; a switching control section configured to execute switching control to switch the first electronic fuse and the second electronic fuse between an on state and an off state, a diagnostic information storage section configured to store diagnostic information related to communication with the first control device, and a state information storage section configured to store first fuse state information related to a state of the first electronic fuse, which is referred to for invalidating the diagnostic information.