On-Board Sensor Delay Alignment for Accurate Abnormality Detection
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Solution Overview
Problem
Conventional abnormality detection techniques in on-board systems often result in false detection due to transmission delays in sensor measurement results, causing inaccuracies in determining actual abnormalities.
Innovation Solution
An on-board apparatus with a receiving unit, delay processing unit, and detection unit that receives and processes sensor data changes, performs delay processing to create an internal output sequence closer to the external transmission sequence, thereby reducing the influence of transmission delays and accurately detecting abnormalities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If abnormality detection is performed based on measurement results of sensors without delay processing, then detection speed is improved, but false detection occurs due to transmission delays in the on-board network
Solution Approach 1:
The system performs delay processing on sensor measurement results before abnormality detection to compensate for transmission delays. By preliminarily adjusting the timing of received data to match the expected transmission sequence, the system eliminates false detections caused by out-of-order arrivals while maintaining accurate detection timing.
2Reliability
If delay processing is performed on sensor data to align with transmission sequence, then false detection is suppressed, but processing complexity increases
Solution Approach 1:
The system introduces a delay processing unit as an intermediary component between the sensor data reception and abnormality detection units. This dedicated module specifically handles the timing alignment of measurement results with the transmission sequence, isolating the complexity of delay compensation from the main detection logic and simplifying the overall system architecture.
3Productivity
If sensor data is processed in real-time without delay adjustment, then processing speed is improved, but detection accuracy deteriorates due to transmission delays
Solution Approach 1:
The system dynamically adjusts the timing parameter of sensor measurement results through delay processing. By changing the temporal parameter of the data to compensate for transmission delays, the system maintains both high processing speed and accurate detection precision, as the delay adjustment is performed efficiently without requiring reprocessing of the entire detection logic.
Data Source
AI summary
An on-board apparatus includes: a receiving unit configured to receive, via a transmission path, a plurality of pieces of change information respectively indicating changes in measurement results of a plurality of sensors mounted in a vehicle, a delay processing unit configured to perform delay processing for delaying and outputting at least one of the plurality of pieces of change information received by the receiving unit, and a detection unit configured to detect an abnormality based on an internal output sequence that is an output sequence in which the delay processing unit outputs the plurality of pieces of change information.