Abnormality Determination Using Roadside Reference for Sensor Validation
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Solution Overview
Problem
Existing automated driving systems face challenges in determining abnormality in roadside units and motor vehicles without requiring multiple vehicles, leading to potential delays in identifying sensor malfunctions or degradations.
Innovation Solution
An abnormality determination apparatus that uses reference information to compare absolute location data from sensors with known information, allowing for individual abnormality determination of roadside units and motor vehicles without relying on multiple vehicles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple motor vehicles are used for sensor abnormality determination, then determination accuracy is improved, but system complexity and time delay increase
Solution Approach 1:
The patent introduces a roadside unit as an intermediary reference object with known, stable location information. Instead of comparing sensor data across multiple moving vehicles, the system uses the roadside unit's fixed position as a reference point to validate onboard sensor measurements, thereby maintaining determination accuracy while reducing system complexity
Solution Approach 2:
The patent creates a reference model of the roadside unit's location and characteristics stored in advance. The onboard sensor's detection results are compared against this pre-established reference information, enabling accurate abnormality determination without requiring real-time data from multiple vehicles
2Reliability
If multiple motor vehicles are selected for abnormality determination, then determination reliability is improved, but response time deteriorates
Solution Approach 1:
The patent performs preliminary actions by pre-storing the roadside unit's location information and detection characteristics in a database before actual operation. When abnormality determination is needed, the system immediately compares current sensor readings against this pre-prepared reference data, eliminating the time delay associated with coordinating multiple vehicles
3Productivity
If onboard sensor detection results are directly compared without absolute location transformation, then processing speed is improved, but determination accuracy deteriorates
Solution Approach 1:
The patent segments the location information processing into two distinct stages: first, the onboard sensor detects object location in its own coordinate system; second, the absolute location calculation unit transforms this relative location into a standardized absolute coordinate system using GPS and map data. This segmentation allows efficient local detection while ensuring accurate global position matching against the roadside unit reference
Data Source
AI summary
An abnormality determination apparatus is provided which can determine the presence or absence of abnormality by defining known information as reference information, and by comparing the reference information with information from a sensor(s). The abnormality determination apparatus comprises: an object-matter detection unit for performing object-matter detection on the basis of a reception signal outputted from an onboard surroundings monitoring sensor being included in an object-matter detecting sensor(s); an absolute location calculation unit for transforming a relative location of an object-matter contained in an object-matter detection result outputted from the object-matter detection unit into an absolute location; and an abnormality determination unit for performing determination whether or not abnormality is caused in the onboard surroundings monitoring sensor by comparing absolute location information outputted from the absolute location calculation unit with reference information.