ECU CAN Reception Inspection via Priority Message Simulation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing inspection methods for CAN communication functions in ECUs are inadequate as they cannot determine whether the CAN communication function, specifically the reception function, is normal, and require expensive device replacement for inspection.
Innovation Solution
An inspection apparatus that connects to the ECU on a one-to-one basis, creates an inspection message with a higher priority signal level, transmits it to the ECU, and determines the normalcy of the reception function based on whether the message is received after transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If non-defective replacement inspection is performed, then defective devices can be identified, but expensive devices must be prepared and multiple work steps are required
Solution Approach 1:
The patent uses a communication simulation unit that creates a virtual copy of the ECU's communication behavior. Instead of replacing the physical ECU with a known good unit, the system generates simulated communication messages that replicate normal ECU behavior patterns, allowing inspection without physical device replacement
Solution Approach 2:
The communication simulation unit acts as an intermediary between the inspection system and the ECU. It generates simulated messages that mediate the inspection process, allowing the system to evaluate ECU reception functionality without direct physical intervention or device replacement
2Measurement precision
If communication load determining apparatus is used, then communication load abnormality can be determined, but CAN communication function (reception function) normalcy cannot be determined
Solution Approach 1:
Instead of having the ECU transmit messages and measuring the load, the inspection system inverts the approach by having the communication simulation unit generate messages that the ECU should receive. This allows direct testing of the reception function by checking whether the ECU properly processes incoming simulated messages
Solution Approach 2:
The system implements feedback by monitoring whether the ECU generates appropriate response messages after receiving simulated inspection messages. The communication simulation unit sends test messages and evaluates the ECU's reception functionality based on the presence and correctness of response messages, creating a closed-loop detection mechanism
Data Source
AI summary
An inspection apparatus, which inspects a CAN communication function of an ECU to be inspected, comprises: a connection unit configured to connect a communication circuit of the ECU and the inspection apparatus on a one-to-one basis; an inspection message creation unit configured to create an inspection message in which a predetermined signal level indicating a higher priority of communication arbitration than the message received from the ECU to be inspected is set in an identifier field of a data format corresponding to the message; a transmission unit configured to transmit the inspection message to the ECU; a reception unit configured to receive a message transmitted from the ECU; and a reception function determination unit configured to determine whether a reception function of the ECU is normal based on whether the reception unit has received the message from the ECU after transmission of the inspection message.