Autonomous Emergency Braking Reserve Control at High Speeds
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Solution Overview
Problem
Existing autonomous emergency braking systems face limitations in availability at high speeds, leading to safety risks for both the ego vehicle and following vehicles, as they often surprise the driver of the following vehicle and may not perform effectively due to reliance on external sensor data.
Innovation Solution
A method for controlling autonomous emergency braking that initializes a braking reserve level and time counter, allowing for more frequent and reliable activation of braking assistance, even at high speeds, by resetting the reserve when a time threshold is reached or upon new activation, ensuring safety and reducing the risk of rear-end collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If autonomous emergency braking is activated at high speeds, then the stopping capability of the ego vehicle is improved, but the safety of following vehicles deteriorates due to surprise braking
Solution Approach 1:
The system performs preliminary actions by notifying the following vehicle of the upcoming autonomous emergency braking before the actual braking occurs. This advance notification allows the following driver to prepare for the sudden deceleration, reducing the harmful surprise effect while maintaining the ego vehicle's high-speed stopping capability
Solution Approach 2:
The system applies preliminary anti-action by sending a notification signal to counteract the potential harmful effect of surprise braking on following vehicles. This preliminary communication prevents the negative consequence (rear-end collision due to surprise) before it can occur
2Reliability
If autonomous emergency braking is limited by maximum speed threshold, then the safety regarding rear impact is improved, but the availability of autonomous emergency braking deteriorates
Solution Approach 1:
The system dynamically adjusts the autonomous emergency braking activation criteria based on the presence and characteristics of following vehicles. When a following vehicle is detected, the system modifies its behavior by implementing the notification protocol, thereby expanding the available operating conditions without compromising safety
Solution Approach 2:
The system changes the operational parameters of autonomous emergency braking based on environmental conditions, specifically the presence of following vehicles. By adjusting the activation logic and implementing speed difference thresholds, the system expands the availability of AEB across different speed conditions while maintaining safety through adaptive parameter modification
3Object-affected harmful factors
If autonomous emergency braking is interrupted or reduced when collision speed exceeds threshold, then the risk of rear-end collision is reduced, but the safety of the ego vehicle deteriorates
Solution Approach 1:
Instead of interrupting or reducing braking force, the system performs a preliminary action by notifying the following vehicle before executing full autonomous emergency braking. This allows the ego vehicle to maintain maximum braking force for its own safety while giving the following driver advance warning to prevent rear-end collision
Data Source
AI summary
A method controls autonomous emergency braking of an ego motor vehicle by initializing a braking reserve level and a time counter to a predetermined value, activating autonomous emergency braking, consuming a braking reserve and decrementing the braking reserve level for as long as the autonomous emergency braking is active, deactivating the autonomous emergency braking as soon as a braking request is interrupted or the braking reserve level reaches zero, incrementing a time counter as soon as autonomous emergency braking is deactivated and as long as no new autonomous emergency braking is activated, resetting the time counter to the predetermined time value as soon as a predetermined time threshold is reached by the time counter or as soon as new autonomous emergency braking is activated before said time threshold is reached, and resetting the braking reserve to the predetermined value as soon as the time counter exceeds the time threshold.