Data Excluding Device Isolates Illegal ECU via Bus Dominant Bits
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Solution Overview
Problem
The existing immobilizer systems in vehicles are vulnerable to theft as they cannot prevent unauthorized operation by replacing the immobilizer ECU or engine ECU, leading to bus failures and loss of critical security functions.
Innovation Solution
A data excluding device connected to a bus that discards communication with a particular node by outputting continuous dominant bits when a specific ID is detected, effectively isolating the illegal ECU and preventing data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bus failure is generated to prevent vehicle theft by replacing ECU, then vehicle security is improved, but communication of all ECU becomes unavailable and security functions are lost
Solution Approach 1:
The invention segments the communication control by node ID, allowing selective exclusion of only the unauthorized node's communications while maintaining normal communication for all other nodes. The data excluding device identifies specific node IDs and excludes only those particular nodes from communication, rather than generating a general bus failure that would affect all nodes.
Solution Approach 2:
The data excluding device applies different communication treatment to different nodes based on their identification. Authorized nodes maintain normal communication quality, while the unauthorized node experiences excluded communication. This local differentiation resolves the contradiction by targeting only the specific security threat without affecting overall system communication.
2Reliability
If all ECU communication is blocked to prevent illegal ECU operation, then unauthorized engine start is prevented, but normal vehicle operations are disrupted
Solution Approach 1:
The communication blocking is segmented to affect only the unauthorized node identified by its specific ID, while all other nodes continue normal operations. This selective approach prevents unauthorized engine starts through the illegal ECU while maintaining normal vehicle functions through communications between legitimate ECUs.
Solution Approach 2:
The data excluding device acts as an intermediary on the bus that selectively filters communications. It intercepts and excludes data from the unauthorized node while allowing all other communications to pass through unchanged, thus preventing illegal operations without disrupting normal vehicle functionality.
3Reliability
If continuous dominant bits are output to exclude particular node communication, then communication with that node is eliminated, but other communication functions may be affected
Solution Approach 1:
The data excluding device is pre-configured with the ID of the unauthorized node before the theft incident occurs. When the unauthorized node attempts communication, the device immediately recognizes its ID and outputs continuous dominant bits to exclude that specific node, enabling rapid response without complex real-time analysis.
Data Source
AI summary
ECU 2 has a function for discarding data when continuous dominant equal to or greater than 6 bits is received during data reception. A data excluding device 5 is connected to a bus 3 to which the ECU 2 is connected. When ID of data received through the bus 3 matches ID of an illegal ECU detected by a theft sensor 4, the data excluding device 5 outputs 7 bits continuous dominant to the bus 3, and then stops output of the dominant.