Pedestrian Braking Control Beyond Front Blind Spot Detection
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Solution Overview
Problem
Commercial vehicles equipped with pedestrian automatic emergency braking systems face challenges in accurately detecting pedestrians within the vehicle's front blind spot due to camera placement, leading to potential collisions.
Innovation Solution
A vehicle system incorporating a forward-looking camera and driver assistance controller that maintains a braking request based on pedestrian detection, even when the pedestrian moves out of the camera's field of view, using historical data and additional sensors to ensure continuous braking intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the camera is mounted behind the windshield in commercial vehicles, then the system structure is simplified and installation is easier, but the pedestrian detection capability is reduced due to the front blind spot
Solution Approach 1:
The system performs preliminary detection actions by maintaining the braking request signal even when the pedestrian moves out of the current camera field of view. The driver assistance controller continues to transmit the braking request based on the last known target position, ensuring continuous braking intervention before the pedestrian can be fully obscured by the vehicle's front blind spot.
2Stability of the object's composition
If the camera field of view is limited by the vehicle structure, then the camera can be positioned in a fixed location, but the detection coverage is reduced and pedestrians in blind spots cannot be detected
Solution Approach 1:
The driver assistance controller maintains the braking request signal continuously until the pedestrian is no longer identified as a target. This continuous signal transmission ensures that the braking intervention remains active throughout the entire period when the pedestrian poses a threat, even when the pedestrian moves in and out of the camera's field of view or becomes obscured by the vehicle structure.
3Measurement precision
If the system releases braking when the target moves out of the field of view, then the system responds to current sensor data, but the braking intervention is interrupted and collision risk increases
Solution Approach 1:
The system performs preliminary action by maintaining the braking request signal in advance of the actual collision risk. When a pedestrian is detected as a target, the driver assistance controller transmits the braking request signal and continues to maintain it even when the pedestrian moves out of the field of view, ensuring that braking intervention is not prematurely interrupted and providing a safety buffer before potential collision.
Data Source
AI summary
A vehicle system for a commercial vehicle comprises a first forward-looking camera, a service braking controller; and a driver assistance controller communicating with the first forward looking camera and the service braking controller. The driver assistance controller identifies a pedestrian as a target within the field of view of the first forward looking camera, determines a distance to the pedestrian is less than or equal to a predetermined distance, transmits a signal to the service braking controller to request deceleration of the vehicle in response to the distance to the pedestrian being less than or equal to the predetermined distance. The driver assistance controller maintains the signal to the service braking controller until the pedestrian is no longer identified as a target.