Driving Assistance Device Lateral Distance Threshold Adjustment
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Solution Overview
Problem
Existing driving assistance devices fail to accurately determine the timing for vehicle control based on the lateral width of obstacles, leading to potential collisions, as they calculate time to collision without considering the obstacle's lateral width, resulting in inconsistent and inappropriate vehicle control responses.
Innovation Solution
A driving assistance device that includes a target information acquisition system, vehicle state information acquisition system, and an electronic control unit to estimate the traveling prediction course, calculate lateral distances, and adjust thresholds and index values based on the lateral distance of obstacles to determine the need for vehicle control, ensuring timely intervention based on the obstacle's proximity to the vehicle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If time to collision is calculated based on the center of the obstacle, then the calculation is simple, but the accuracy of collision risk assessment deteriorates due to ignoring lateral width
Solution Approach 1:
The obstacle detection and evaluation process is segmented into multiple stages: initial center-based TTC calculation, lateral width extraction, lateral distance calculation, and multi-parameter综合 evaluation. This segmentation allows the system to maintain simple initial calculations while adding precision through subsequent analysis steps.
Solution Approach 2:
The system transitions from one-dimensional center-based distance measurement to two-dimensional spatial analysis by incorporating lateral width and lateral distance parameters. This dimensional expansion enables more accurate collision risk assessment by considering the obstacle's full spatial extent relative to the vehicle's path.
2Device complexity
If vehicle control threshold is kept constant, then the control logic is simple, but the appropriateness of vehicle control deteriorates for obstacles with different lateral widths
Solution Approach 1:
The vehicle control threshold is transformed from a static constant value to a dynamic parameter that automatically adjusts based on obstacle lateral width and lateral distance. This dynamic threshold adapts to different obstacle scenarios, providing appropriate control responses without requiring complex manual reconfiguration.
Solution Approach 2:
The system changes the threshold parameter based on lateral width and lateral distance measurements. By making the threshold a function of these spatial parameters rather than a fixed value, the system achieves versatile and appropriate vehicle control across different obstacle scenarios while maintaining relatively simple control logic.
3Productivity
If vehicle control timing is based solely on time to collision, then the response timing is uniform, but the timeliness of intervention deteriorates for obstacles closer to the vehicle's lateral path
Solution Approach 1:
The system performs preliminary analysis of lateral distance and lateral width before finalizing vehicle control decisions. By evaluating these spatial parameters in advance, the system can proactively adjust the control threshold and timing, ensuring timely intervention for obstacles that pose higher collision risk due to their lateral positioning.
Data Source
AI summary
A driving assistance device includes a target information acquisition device, a vehicle state information acquisition device, and an electronic control unit. The electronic control unit is configured to determine whether a specific condition which is set so as to be established when vehicle control is needed in accordance with a result of comparison between an index value and a predetermined threshold is established, perform the vehicle control for avoiding contact of the host vehicle with an obstacle or abnormal proximity of the host vehicle to the obstacle when the specific condition is determined to be established, and change at least one of the predetermined threshold and the index value based on a lateral distance so that the specific condition has more of a tendency to be established as the lateral distance decreases.