Adaptive Pedestrian Protection Thresholds
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Solution Overview
Problem
Existing pedestrian-protection systems in vehicles often incorrectly trigger or fail to trigger safety measures due to insufficient algorithms for distinguishing between pedestrians and other objects, particularly in cases involving small children or partial bumper impacts.
Innovation Solution
The method varies the impact threshold value based on the detected type of collision object, using a combination of surroundings and contact sensors to determine the object's type, size, relative speed, and impact energy, adjusting the sensitivity of the pedestrian-protection device accordingly to prevent unnecessary triggering or deactivation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed threshold value is used for pedestrian detection, then the system is simple to operate, but incorrect triggering occurs frequently (false positives for non-pedestrians or false negatives for actual pedestrians)
Solution Approach 1:
The patent applies dynamics by making the threshold value adaptive rather than fixed. The control unit dynamically adjusts the threshold based on the detected type of collision object (pedestrian, cyclist, motorcyclist, animal, or other vehicle). This allows the system to optimize detection accuracy for each object type while maintaining a unified detection system, resolving the contradiction between reliability and complexity.
2Reliability
If the detection algorithm is made more sensitive to detect all pedestrians, then detection coverage improves, but false triggering increases for non-pedestrian objects
Solution Approach 1:
The patent applies local quality by implementing object-type-specific threshold values. Instead of using a single sensitive threshold for all objects, the system applies different threshold criteria locally optimized for each collision object type (pedestrian, cyclist, motorcyclist, animal, other vehicle). This enables high detection coverage for actual pedestrians while preventing false triggering for other objects through type-specific discrimination.
3Object-generated harmful factors
If the detection algorithm is made more specific to distinguish pedestrian types, then false triggering decreases, but detection accuracy for edge cases (small children, partial impacts) worsens
Solution Approach 1:
The patent applies universality by creating a multi-functional detection system that handles diverse collision scenarios through a unified adaptive framework. The control unit universally applies the principle of type-based threshold adjustment across all object categories, enabling the system to function effectively for both common cases (adult pedestrians) and edge cases (small children, partial impacts) by adapting the threshold to the detected object type rather than requiring separate detection algorithms for each scenario.
Data Source
AI summary
The disclosure relates to a method for operating a pedestrian-protection device of a vehicle, in particular a motor vehicle, which has a surroundings sensor system and a contact sensor system, and is configured to trigger at least one pedestrian-protection measure. The method comprises monitoring the surroundings of the vehicle to detect a collision object using the surroundings sensor system, and determining the type of detected collision object before an impact with the vehicle. The method further comprises using the contact sensor system to determine an impact feature on the vehicle of the detected collision object, which has impacted with the vehicle, and to compare the impact feature with at least one predefineable limiting value, in order to make a decision about the triggering of the pedestrian-protection measure. In this context there is provision that the limiting value is changed as a function of the determined type of detected collision object.