Autonomous Emergency Braking Delay for Turning Vehicle Detection
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Solution Overview
Problem
Conventional autonomous emergency braking systems activate unnecessarily when a forward vehicle is turning out of the host vehicle's path, leading to false alarms and operator annoyance, as they fail to consider the vehicle's intention to leave the path.
Innovation Solution
A control system that uses sensors like cameras, radar, and lidar to determine if a forward vehicle is turning by analyzing turn indicator lights, deceleration, and road features, delaying emergency braking activation when the vehicle is likely to exit the path, thereby avoiding unnecessary alerts and improving operator satisfaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional AEB systems activate emergency braking when a forward vehicle is detected in the path, then collision avoidance is improved, but false alarms and operator annoyance increase when the forward vehicle is turning out of the path
Solution Approach 1:
The system performs preliminary detection of turn indicator lights and deceleration patterns before activating emergency braking. By detecting the forward vehicle's turning intention in advance through turn signal lights and speed reduction, the system delays AEB activation until the vehicle actually enters the collision path, preventing false alarms while maintaining collision avoidance capability
Solution Approach 2:
The system continuously monitors the forward vehicle's behavior (turn indicator status, deceleration rate, position changes) and uses this feedback to dynamically adjust AEB activation timing. When turn indicators are detected or deceleration patterns match turning behavior, the system delays braking activation, creating a feedback loop that adapts to the forward vehicle's actual intentions
2Object-generated harmful factors
If AEB activation is delayed when a forward vehicle is turning, then false alarms are reduced, but response time to actual collision threats may be increased
Solution Approach 1:
The system dynamically adjusts the delay duration based on real-time conditions. The delay is not fixed but varies according to the forward vehicle's actual movement toward or away from the collision path, ensuring that braking activation occurs at the optimal moment - delayed enough to avoid false alarms but timely enough to prevent actual collisions
Solution Approach 2:
While delaying activation, the system continues preliminary monitoring of the forward vehicle's position, speed, and trajectory. This preliminary action ensures that when the delay period ends and activation is finally triggered, the response is immediate and appropriate for the current collision risk level
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
A method and controller are provided for delaying activation of autonomous emergency braking of a host vehicle, based on a determination that autonomous emergency braking is not needed because a forward vehicle in front of the host vehicle is turning out of the path of the host vehicle. The controller receives inputs from sensors arranged on the host vehicle and includes a processor for determining whether and when to activate autonomous emergency braking. The processor includes control logic that determines whether a forward vehicle is present in front of the host vehicle and whether the forward vehicle is expected to turn out of a path of the host vehicle prior to the host vehicle reaching a current position of the forward vehicle. Based on the inputs from the sensors, the control logic determines whether to delay activation of the autonomous emergency braking of the host vehicle for a time value.