AEB Braking Profiles for Rear-Aware Collision Mitigation
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Solution Overview
Problem
Conventional automatic emergency braking (AEB) systems in autonomous and semi-autonomous vehicles primarily focus on the front view, leading to false negatives and false positives, and do not efficiently account for trailing vehicles or environmental conditions, resulting in inefficient braking and potential collisions.
Innovation Solution
The system utilizes rear-view sensors in conjunction with front and side sensors to dynamically adjust AEB activation triggers and braking profiles based on the presence and dynamics of objects around the vehicle, including trailing vehicles, to enhance collision avoidance and passenger comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional AEB systems apply full brake force to ensure collision avoidance, then forward collision is prevented, but rear collision risk increases with undetected trailing vehicles
Solution Approach 1:
The system applies different braking strategies based on local environmental conditions. When a trailing vehicle is detected in the rear, the braking force is moderated to avoid causing a rear collision. When no trailing vehicle is present, full brake force is applied to ensure forward collision avoidance. This local quality approach tailors the braking response to specific spatial conditions.
Solution Approach 2:
The system performs preliminary detection of trailing vehicles before applying brakes. By detecting the rear environment in advance, the system can prevent the harmful effect of rear collision by adjusting braking intensity before the braking action occurs.
2Speed
If conventional AEB systems use single braking torque profile to brake as fast as possible, then forward collision response is maximized, but passenger comfort decreases and rear collision risk increases
Solution Approach 1:
The system dynamically selects braking profiles based on detected environmental conditions. Multiple braking profiles are available, and the system chooses the appropriate profile based on the presence of trailing vehicles and spatial context. This dynamic selection optimizes both response speed and comfort by matching braking intensity to situational requirements.
Solution Approach 2:
The patent changes the braking parameter from a single fixed torque profile to multiple variable profiles. The selected profile depends on rear environment conditions, allowing the system to adjust braking characteristics (intensity, duration, progression) to balance collision avoidance with passenger comfort and safety.
3Device complexity
If conventional AEB systems limit field of view to front portions only, then system complexity is reduced, but awareness of trailing vehicles is lost leading to inefficient braking decisions
Solution Approach 1:
The system uses rear-view sensors that serve multiple functions: detecting trailing vehicles, determining spatial context for activation decisions, and selecting appropriate braking profiles. This multi-functionality justifies the added sensor capability by extracting maximum value from the rear environment information.
Data Source
AI summary
In various examples, activation criteria and/or braking profiles corresponding to automatic emergency braking (AEB) systems and/or collision mitigation warning (CMW) systems may be determined using sensor data representative of an environment to a front, side, and/or rear of a vehicle. For example, activation criteria for triggering an AEB system and/or CMW system may be adjusted by leveraging the availability of additional information with regards to the surrounding environment of a vehicle-such as the presence of a trailing vehicle. In addition, the braking profile for the AEB activation may be adjusted based on information about the presence of and/or location of vehicles to the front, rear, and/or side of the vehicle. By adjusting the activation criteria and/or braking profiles of an AEB system, the potential for collisions with dynamic objects in the environment is reduced and the overall safety of the vehicle and its passengers is increased.