Adaptive AEB Threshold Control for Sudden Brake Prevention
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Solution Overview
Problem
Existing vehicle braking assistance systems during autonomous driving do not adequately address the risk of in-vehicle accidents due to emergency braking, as they focus primarily on preventing collisions with external obstacles rather than managing the freedom of occupant posture and action within the vehicle.
Innovation Solution
A braking assistance control device that calculates an index for defining the accuracy of future prediction of relative information between the vehicle and obstacles, and sets a threshold value for determining whether to perform braking assistance control, allowing for early activation of the AEB with a weaker braking force when the prediction accuracy is high.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If AEB activation threshold is set low to prevent collision, then collision avoidance capability is improved, but in-vehicle accident risk increases due to sudden braking
Solution Approach 1:
The patent applies dynamics by making the AEB activation threshold variable rather than fixed. The threshold is dynamically adjusted based on the autonomous driving operation index, which reflects the reliability of future position prediction. When prediction reliability is high, the threshold is lowered to enable early activation with gentle braking. When prediction reliability is low, the threshold is raised to prevent false activation. This dynamic adjustment resolves the contradiction between collision avoidance and in-vehicle safety.
Solution Approach 2:
The patent changes the parameter of AEB activation threshold based on the autonomous driving operation index. By calculating future position prediction reliability and adjusting the threshold parameter accordingly, the system achieves both collision avoidance and in-vehicle safety. The threshold parameter is modified according to the predicted accuracy of obstacle and vehicle position, allowing optimal braking intervention in each situation.
2Object-affected harmful factors
If AEB activates early with weak braking force to prevent in-vehicle accident, then in-vehicle safety is improved, but collision avoidance effectiveness decreases
Solution Approach 1:
The system dynamically adjusts the AEB activation threshold based on prediction reliability. When the autonomous driving operation index indicates high prediction accuracy, the threshold is set low allowing early activation with weak braking force, preventing in-vehicle accidents. When prediction accuracy is low, the threshold is raised to ensure strong braking force is available for effective collision avoidance. This dynamic parameter adjustment resolves the contradiction between in-vehicle safety and collision avoidance effectiveness.
Solution Approach 2:
The patent implements preliminary action by calculating the autonomous driving operation index and predicting future positions in advance of potential collision scenarios. This preliminary prediction allows the system to determine the appropriate activation threshold before a collision risk materializes, enabling proactive adjustment of braking parameters to prevent both in-vehicle accidents and external collisions.
3Device complexity
If AEB uses fixed threshold for braking activation, then system complexity is reduced, but adaptability to different prediction accuracy levels decreases
Solution Approach 1:
The patent introduces dynamics by making the AEB activation threshold adaptive rather than fixed. The threshold automatically adjusts based on the autonomous driving operation index, which quantifies prediction accuracy. This dynamic adaptation increases versatility without significantly increasing system complexity, as the adjustment is based on calculated indices from existing sensor data rather than requiring complex additional hardware or algorithms.
Data Source
AI summary
An object of the present invention is to obtain a braking assistance control device capable of preventing sudden brake in a case where accuracy of future prediction is high and preventing malfunctions in a case where accuracy of future prediction is low by changing an appropriate control characteristic according to the accuracy of future prediction. A braking assistance control device of the present invention is a device that performs braking assistance control of an own vehicle according to a possibility of collision between the own vehicle and an obstacle, and includes an index calculating unit that calculates an index for defining accuracy of future prediction of relative information between the own vehicle and the obstacle, and a threshold value setting unit that changes a threshold value for determining whether or not to perform the braking assistance control according to the index.