ADAS-Linked Active Hood Pedestrian Detection Threshold
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Solution Overview
Problem
Existing active hood devices pop up irrespective of the collision object, leading to unnecessary repairs and increased costs when the collision object is not a pedestrian or vehicle.
Innovation Solution
An ADAS-linked active hood apparatus that includes a controller to receive information from an ADAS device about the collision object, adjust a pedestrian detection threshold, and compensate the output reference value of a collision sensor unit to accurately determine if a pedestrian is involved in a collision, thereby adjusting the pop-up of the active hood lift system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the active hood device is configured to perform pop-up irrespective of object type, then pedestrian safety is improved, but unnecessary repairs and costs increase when collision object is not a pedestrian or vehicle
Solution Approach 1:
The system changes the reference value parameter of the collision sensor unit based on the detected object type. When a pedestrian is detected, a lower reference value is applied to trigger pop-up more readily, while when non-pedestrian objects are detected, a higher reference value prevents unnecessary activation. This dynamic parameter adjustment resolves the contradiction by making the safety system adaptive to different collision scenarios.
Solution Approach 2:
The system uses ADAS detection feedback to continuously monitor the type of object in front of the vehicle and adjusts the collision sensor reference value accordingly. This feedback loop ensures that the hood pop-up function responds appropriately to different collision risks, maintaining high pedestrian safety while avoiding unnecessary activations for non-critical objects.
2Device complexity
If the collision sensor unit uses a fixed reference value, then device complexity is reduced, but measurement precision deteriorates in differentiating between pedestrian and non-pedestrian collisions
Solution Approach 1:
The controller performs multiple functions: it manages the collision sensor unit, processes ADAS object detection data, and dynamically adjusts the reference value based on object type. This multi-functionality allows the system to maintain a relatively simple sensor hardware configuration while achieving high measurement precision through intelligent software-based reference value compensation.
3Duration of action of moving object
If the active hood lift system activates for all collision types, then safety response time is improved, but loss of energy increases due to unnecessary hood activations
Solution Approach 1:
The system dynamically adjusts the reference value based on real-time object detection, making the activation threshold flexible rather than fixed. This allows the system to maintain rapid response capability for critical pedestrian collisions while preventing energy-wasting activations for non-critical objects, optimizing both response time and energy efficiency.
Data Source
AI summary
An ADAS-linked active hood apparatus includes an ADAS device that measures information regarding a driving state of a vehicle and an object and a collision sensor unit that is positioned at a front of the vehicle and measures collision with the object. An active hood lift system (AHLS) raises one end of a hood of the vehicle based on a signal from the collision sensor unit. A controller sets a pedestrian detection threshold (PDT) turn, receives information regarding a plurality of front objects from the ADAS device to compensate for a PDT, compensates for an output reference value of the collision sensor unit based on the compensated PDT, and determines whether collision occurs using the collision sensor unit to adjust pop-up of the AHLS when an output value equal to or greater than the compensated reference value is applied.