AEB Filter Switching for Off-Road Departure Braking
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Solution Overview
Problem
Existing commercial vehicle braking systems face challenges in effectively integrating automatic emergency braking, lane departure warning, and service braking to prevent unintentional roadway departures and collisions with stationary objects.
Innovation Solution
A vehicle system comprising a braking controller, automatic emergency braking controller, and lane departure warning controller, which switch between filtering modes to manage deceleration requests based on vehicle position and obstacle detection, ensuring appropriate braking interventions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the automatic emergency braking controller uses a first filtering mode for object detection, then collision avoidance with moving objects is improved, but false alerts increase when the vehicle departs the roadway
Solution Approach 1:
The automatic emergency braking controller dynamically switches between first and second filtering modes based on the vehicle's roadway status. When the lane departure warning controller detects roadway departure, the system transitions from first filtering mode (designed for normal roadway operation) to second filtering mode (designed for roadway departure scenarios), thereby adapting the object detection behavior to current operating conditions and reducing false alerts during unintentional departures
2Reliability
If the automatic emergency braking controller detects all objects in front of the vehicle, then collision prevention is improved, but braking interventions occur unnecessarily during roadway departures
Solution Approach 1:
The system applies different filtering qualities to object detection based on the vehicle's operational context. In the first filtering mode during normal roadway operation, the controller detects all objects. In the second filtering mode during detected roadway departure, the controller applies a different filtering criterion that accounts for the departure context, thereby improving braking intervention accuracy by matching the detection sensitivity to the local operational conditions
3Device complexity
If different controllers operate independently, then system complexity is reduced, but integration of braking functionality deteriorates
Solution Approach 1:
The lane departure warning controller provides feedback to the automatic emergency braking controller by transmitting messages when the vehicle departs the roadway. This feedback mechanism enables the AEB controller to switch from first to second filtering mode, thereby improving braking functionality adaptability while maintaining relatively simple independent controller architectures. The feedback loop allows coordinated operation without requiring complex deep integration
Data Source
AI summary
A vehicle system includes a braking controller for implementing service braking in response to a brake request message, a lane departure warning controller for transmitting a message indicative of a vehicle departing a defined roadway and an automatic emergency braking controller for detecting objects in front of the vehicle. The automatic emergency braking controller uses a first filtering mode for object detection and transmits a braking request message in response to an object detection. The automatic emergency braking controller filters objects in a second filtering mode when the lane departure warning controller transmits a message indicating the vehicle has departed the defined roadway.