Vehicle ECU Current Monitoring for Abnormal Bus Identification
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Solution Overview
Problem
Existing abnormality determination systems for vehicle electronic control units cannot specify which electronic control unit or communication path is affected when an abnormality occurs, especially in cases of unauthorized access.
Innovation Solution
An abnormality determination system that includes a control unit connected to electronic control units via multiple communication buses, which performs power supply control to measure current changes and stores information on specific electronic control units or communication buses with abnormal activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple switches control power supply to multiple electronic control units, then power management capability is improved, but ability to specify abnormal electronic control unit deteriorates
Solution Approach 1:
The system segments the power supply control by assigning dedicated switches to specific electronic control units. When an abnormality is detected, the control unit can isolate and control power supply to individual ECUs rather than controlling all ECUs collectively, enabling precise identification of the abnormal unit while maintaining overall power management capability.
2Loss of energy
If all electronic control units are controlled to turn off, then power consumption is reduced, but ability to detect abnormal communication path deteriorates
Solution Approach 1:
The control unit performs preliminary power supply control on specific electronic control units before detecting communication abnormalities. By controlling power supply to individual ECUs in advance and monitoring current changes, the system can detect abnormal communication paths even when most ECUs are turned off, thus maintaining low power consumption while ensuring abnormality detection capability.
3Measurement precision
If current measurement is performed on all electronic control units, then detection coverage is improved, but system complexity increases
Solution Approach 1:
The system implements selective current measurement by monitoring current changes only in electronic control units that are currently powered on or suspected of having abnormalities. Rather than continuously measuring all ECUs, the control unit dynamically adjusts measurement based on power supply state and abnormality indicators, maintaining comprehensive detection coverage while reducing system complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables precise identification of the electronic control unit or communication path with an abnormality, enhancing security by determining the source of unauthorized access and preventing further malicious activity.
Implementation Method 1
measure values of currents that flow through the electronic control units before and after the power supply control
Data Source
AI summary
An abnormality determination system for determining an abnormality of an electronic control unit mounted on a vehicle, comprising: a plurality of electronic control units; and a control unit connected to the plurality of electronic control units via two or more communication buses, wherein, in a case where an activation request is made via a communication bus during parking of the vehicle, the control unit performs predetermined power supply control on the plurality of electronic control units, measures a current value flowing in the plurality of electronic control units before and after the power supply control, and in a case where there is a specific electronic control unit for changing the current value, stores information of a specific electronic control unit, and in a case where there is no electronic control unit for increasing the current value, stores information of the communication bus that has received the activation request.