Vehicle ECU VIN Accuracy via Power Interruption Timing
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Solution Overview
Problem
In vehicle electronic control systems, when one or more electronic control devices are replaced, there is a risk of vehicle identification number mismatch, leading to incorrect identification during vehicle collisions, as existing methods lack a reliable way to determine the correct VIN.
Innovation Solution
A vehicle electronic control device system that includes a detection unit for power supply voltage, a power determination unit, an identification number storage unit, a timing storage unit, and an identification number determination unit, which determines the correct VIN by comparing time information and power supply status across connected devices, ensuring accurate identification and preventing mismatches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If electronic control devices are replaced to maintain system functionality, then device availability is improved, but vehicle identification number accuracy deteriorates due to potential mismatches
Solution Approach 1:
The system performs preliminary actions by recording the timing of power supply interruptions and storing time information in timing storage units before replacement occurs. When devices are replaced, the system compares the recorded timing information to determine which device has the most recent timing data, thereby identifying the correct VIN without requiring manual verification or causing system downtime.
Solution Approach 2:
The system implements feedback by continuously monitoring power supply voltage through detection units, recording timing information when interruptions occur, and using this feedback to automatically determine the correct VIN among multiple devices. The comparison of timing information provides a self-correcting mechanism that ensures VIN accuracy after replacements.
2Ease of operation
If majority decision method is used to determine VIN, then system operation is maintained, but identification accuracy deteriorates due to lack of positive proof
Solution Approach 1:
The system replaces the mechanical majority-voting method with an information-based timing comparison mechanism. Instead of counting how many devices report the same VIN, the system uses detection units to record and compare timing information from power supply interruptions, providing objective proof of which device has the correct VIN based on the most recent timing data.
Solution Approach 2:
The system changes the parameter used for VIN determination from frequency count (majority voting) to timing information comparison. By recording the timing of power supply interruptions and comparing these time parameters, the system achieves more accurate VIN identification with positive proof rather than relying on statistical majority.
Data Source
AI summary
A vehicle electronic control device includes: a detection unit of a power supply voltage; a power determination unit determining whether the power supply voltage is reduced below a predetermined voltage; an identification number storage unit for a vehicle identification number; a timing storage unit storing time information of reduction when the power supply voltage is reduced below the predetermined voltage; a control unit acquiring a vehicle identification number stored in an identification number storage unit and time information stored in a timing storage unit of the other electronic control device; and an identification number determination unit: determining one of the other electronic control device and the electronic control device storing newest time information in the timing storage unit as a target electronic control device; and determining that a vehicle identification number stored in the identification number storage unit of the target electronic control device is a correct identification number.