Serial Bus Error Detection Test Device for Subscriber Stations
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Solution Overview
Problem
Current error detection mechanisms in serial bus systems, such as CAN FD, are inadequate for detecting defects in error detection mechanisms like CRC checkers, leading to undetected errors due to hardware failures or signal interference, which affects data transmission speed and system safety.
Innovation Solution
An error detection test device for subscriber stations in serial bus systems that selectively introduces bit errors into frames to test error detection mechanisms, allowing receivers to verify the correct functioning of error detection protocols, ensuring high system security and compatibility with existing communication versions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If error detection mechanisms are implemented in serial bus systems, then system reliability is improved, but device complexity increases
Solution Approach 1:
The system uses its own transmitted frames as test objects for error detection mechanisms. The transmission system introduces artificial bit errors into outgoing frames, and the reception system detects these errors using existing error detection mechanisms (CRC, stuff bit detection, format checking). This self-testing approach verifies error detection capability without requiring external test equipment, thereby improving reliability while avoiding additional complex test devices.
2Reliability
If multiple transmissions are performed due to errors, then error detection is improved, but data transmission speed deteriorates
Solution Approach 1:
The system performs preliminary error detection testing by introducing artificial errors into transmitted frames before actual data communication. This allows verification that error detection mechanisms are functioning correctly in advance. By ensuring error detection capability before normal operation, the system can maintain high transmission speed during actual communication while relying on the pre-verified error detection mechanisms to catch real errors, avoiding unnecessary retransmissions.
3Reliability
If error detection mechanisms are tested during operation, then system security is improved, but ease of operation deteriorates
Solution Approach 1:
The error detection test device is integrated into the subscriber station itself, allowing the system to test its own error detection mechanisms during normal operation. The transmission system automatically introduces artificial errors into outgoing frames, and the reception system automatically detects and reports these errors. This self-testing capability improves system security without requiring external test equipment or complex operational procedures, maintaining ease of operation.
Data Source
AI summary
An error detection test device for a subscriber station of a serial bus system. The error detection test device has an evaluation module for evaluating which bit of a signal must be interrupted so that the receivers of the resulting signal in which the at least one bit is interrupted can check the function of an error detection mechanism, the signal being processed by a protocol control unit while the subscriber station is in operation in order to be able to be transmitted as a frame onto a bus of the bus system or, after a frame has been received from the bus, to decode the signal from the frame, and an output terminal for outputting a switching signal to the protocol control unit to interrupt the at least one bit. The evaluation module generates the switching signal based on the at least one bit evaluated by the evaluation module.