Power Supply Control Apparatus for Bus Communication Line Protection
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Solution Overview
Problem
In conventional communication systems installed in vehicles, if one Electronic Control Unit (ECU) malfunctions and repeatedly transmits data at short intervals, it can occupy shared communication lines, preventing other ECUs from communicating effectively.
Innovation Solution
A power supply control apparatus that monitors data transmission on shared communication lines, determines if a transmission source is malfunctioning by assessing the interval between data transmissions, and cuts off power supply to that source if the interval is below a predetermined threshold, while also counting instances of cutoff determinations to resume power supply when the threshold is reached, thereby preventing line occupation and ensuring normal operation of other ECUs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If one ECU repeatedly transmits data at short intervals, then the transmission frequency increases, but the communication line becomes monopolized and other ECUs cannot communicate
Solution Approach 1:
The power supply control apparatus monitors the transmission intervals of data from each ECU and provides feedback by cutting off power supply when abnormal short-interval transmissions are detected. This feedback mechanism prevents any single ECU from monopolizing the communication line while maintaining normal communication operations.
Solution Approach 2:
The system changes the operational state of ECUs by dynamically controlling their power supply based on transmission behavior parameters. When an ECU transmits data at intervals shorter than a predetermined threshold, its power supply is cut off, effectively changing its transmission parameter from abnormal high-frequency to zero-frequency.
2Reliability
If power supply is cut off to prevent line occupation, then communication monopolization is prevented, but system complexity increases due to monitoring and control mechanisms
Solution Approach 1:
The power supply control apparatus performs multiple functions: it monitors transmission intervals, determines abnormal behavior, and controls power supply to multiple ECUs. This multi-functional design consolidates what could be separate complex systems into a single integrated apparatus, managing communication reliability without proportionally increasing overall system complexity.
3Measurement precision
If monitoring is performed for each ECU transmission interval, then abnormal transmission can be detected, but the measurement and detection difficulty increases
Solution Approach 1:
Each ECU transmits data with its own identification information, and the power supply control apparatus uses this self-identified data to automatically measure transmission intervals. The ECUs essentially serve the monitoring function by providing their own transmission records, which simplifies the detection process compared to external active monitoring of each ECU.
Data Source
AI summary
In a communication system, ECUs are connected to a bus. A relay apparatus receives data that was transmitted by one of the ECUs via the bus, and determines, based on the content of the reception, whether or not the power supply from a battery to a transmission source that transmitted the data is to be cut off. If the relay apparatus determines that the power supply to the transmission source is to be cut off, the relay apparatus cuts off the power supply from the battery to the transmission source.