Blind Spot Speed Zone Computation for Collision Avoidance
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Solution Overview
Problem
Existing driving assistance devices cannot accurately compute the speed decrease required for collision avoidance and rely heavily on prediction accuracy, leading to unnecessary or inadequate assistance, potentially discomforting drivers.
Innovation Solution
A driving assistance device with a blind spot recognition unit, mobile object information setting unit, speed zone computation unit, brake avoidance condition computation unit, and target speed computation unit, which predicts mobile object speeds and computes appropriate target speeds to ensure safe travel by analyzing the relationship between the host vehicle's speed and distance to a blind spot, independent of course prediction accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If driving assistance is performed using course prediction results, then collision avoidance determination can be made, but the amount of speed decrease required for collision avoidance cannot be computed and prediction accuracy affects determination accuracy
Solution Approach 1:
The invention changes the parameter basis from course prediction results to speed-zone map lookup. Instead of relying on predicted future positions with associated prediction errors, the system computes a speed zone based on current state (position, speed) and assumed mobile object speeds, then determines collision avoidance by comparing actual speed against the speed zone thresholds. This parameter transformation eliminates dependence on course prediction accuracy.
Solution Approach 2:
The speed zone map serves as an intermediary between the current vehicle state and collision avoidance determination. The map pre-computes safe speed ranges based on distance to blind spot and assumed mobile object speeds, acting as a lookup table that translates current conditions into actionable speed guidance without requiring future position predictions.
2Reliability
If driving assistance is performed based on predicted course, then collision possibility can be determined, but unnecessary driving assistance or inadequate assistance may occur causing driver discomfort
Solution Approach 1:
The system transforms the control parameter from binary collision determination to continuous speed zone guidance. By providing specific speed decrease recommendations based on the speed zone map rather than simple collision/not-collision alerts, the system gives drivers precise guidance that adapts to real-time conditions, reducing unnecessary alarms and providing adequate assistance only when needed.
Solution Approach 2:
The speed zone is dynamically adjusted based on current vehicle speed, distance to blind spot, and assumed mobile object speeds. As the vehicle approaches the blind spot or speed increases, the safe speed zone shifts, providing real-time adaptive guidance that matches actual driving conditions rather than static thresholds.
Data Source
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AI summary
A driving assistance device includes a blind spot recognition unit that recognizes a blind spot of a driver in a progressing direction of a host vehicle; a mobile object information setting unit that sets mobile object information including at least an assumed speed of a mobile object, as information on the mobile object having a possibility of appearing suddenly from the blind spot; a speed zone computation unit that computes a speed zone of the host vehicle having a possibility that the host vehicle will come into contact with the mobile object when progressing in the progressing direction, based on the mobile object information set by the mobile object information setting unit; a brake avoidance condition computation unit that computes at least one condition of a brake avoidance condition so that the host vehicle can avoid contact with the mobile object using a brake of the host vehicle and a brake avoidance condition so that the mobile object can avoid contact with the host vehicle using a brake of the mobile object; a speed zone correction unit that corrects the speed zone, based on the brake avoidance condition computed by the brake avoidance condition computation unit; and a target speed computation unit that computes a target speed of the host vehicle based on the speed zone.