Drive Assistance System Sensor Performance Evaluation
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Solution Overview
Problem
Conventional automatic driving systems fail to stop automatic driving prior to a significant decrease in sensor detection performance, particularly in areas where sensor accuracy and sensitivity decline, leading to potential safety issues.
Innovation Solution
A drive assistance system that includes onboard devices and a central hub to evaluate sensor performance and specify 'decrease regions' where detection performance is compromised, allowing automatic driving to be halted before actual sensor failure occurs by communicating vehicle location data and sensor performance metrics across multiple vehicles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If automatic driving stops only after sensor abnormality is determined, then the system maintains operation longer, but safety is compromised because automatic driving cannot stop prior to actual decreasing of detection performance
Solution Approach 1:
The system performs preliminary evaluation of sensor detection performance by comparing sensing information from multiple vehicles. When a decrease region is predicted based on evaluation results from other vehicles, automatic driving is stopped in advance before actual sensor failure occurs, thereby maintaining safety while preventing unnecessary early stops
2Reliability
If sensor detection performance is continuously monitored and evaluated, then automatic driving can be stopped proactively in decrease regions, but the workload and complexity of onboard evaluation systems increases
Solution Approach 1:
The system merges evaluation resources by having multiple vehicles share sensing information through a network. Instead of each vehicle independently performing complex sensor performance evaluation, the onboard device evaluates detection performance by comparing its sensing information with data from other vehicles, distributing the computational workload and reducing individual system complexity
Solution Approach 2:
The system introduces an intermediary evaluation mechanism where sensing information from multiple vehicles is compared to identify decrease regions. This intermediary approach allows proactive stopping without requiring complex onboard evaluation systems, as the evaluation is performed by comparing data across the vehicle network rather than through sophisticated local analysis
Data Source
AI summary
A drive assistance system includes an onboard device that is mounted on a vehicle performing automatic driving based on sensing information detected by a sensor of the vehicle, and a center that communicates with the onboard device. The onboard device includes a sensing information acquisition portion that acquires the sensing information. Either the onboard device or the center includes an evaluation portion that evaluates a detection performance of the sensor based on the sensing information. The center includes a region specification portion that specifies a decrease region where the detection performance of the sensor decreases, the decrease region specified by the detection performance, based on the sensing information, and the decrease region specified by a position at which the sensing information has been detected. The onboard device stops the automatic driving when the vehicle is located in the decrease region.