Electronic Parking Brake Collision Avoidance Arbitration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In escalated driving situations, the predefined deceleration profile of the electronic parking brake (EPB) may not provide sufficient deceleration to avoid an impending collision, as determined by the automatic emergency braking (AEB) system.
Innovation Solution
The electronic stability control (ESC) module arbitrates controlled deceleration between the maximum deceleration of the EPB's predefined profile and the AEB system's requirements, providing additional deceleration when necessary to ensure collision avoidance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ESC module executes the predefined deceleration profile of the EPB, then the vehicle receives controlled deceleration, but the deceleration may be insufficient to avoid impending collision
Solution Approach 1:
The system dynamically adjusts the deceleration profile based on real-time collision risk assessment. The AEB system continuously monitors collision parameters and dynamically modifies the deceleration magnitude and timing, transitioning from a static predefined profile to a dynamic adaptive profile that maximizes collision avoidance capability.
Solution Approach 2:
The system changes key parameters including deceleration magnitude, braking force distribution, and timing based on collision assessment. The AEB system calculates required deceleration parameters and adjusts them in real-time to ensure sufficient braking force is applied to avoid collision, overriding the conservative predefined profile when necessary.
2Productivity
If the AEB system overrides the EPB's predefined deceleration profile, then sufficient deceleration is achieved, but control arbitration complexity increases
Solution Approach 1:
The AEB system acts as an intermediary layer between the driver/EPB and the brake execution system. It receives the predefined deceleration profile from the EPB, assesses collision risk, and mediates by adjusting or overriding the profile as needed. This intermediary structure manages the complexity of control arbitration by centralizing the decision-making logic in the AEB module.
Solution Approach 2:
The system implements continuous feedback loops where the AEB system monitors collision parameters, assesses whether the predefined deceleration profile is sufficient, and adjusts braking commands accordingly. This feedback mechanism enables automatic arbitration without complex manual intervention, using real-time sensor data to determine when override is necessary.
3Reliability
If additional deceleration is provided beyond the EPB's predefined profile, then collision avoidance is enhanced, but braking system stress increases
Solution Approach 1:
The AEB system applies partial braking force initially and progressively increases to excessive braking force only when collision assessment indicates it is necessary. Rather than applying maximum braking force continuously, the system uses progressive force application, starting with the EPB's predefined profile and adding supplemental force only to the extent needed to avoid collision.
Solution Approach 2:
The system prepares for potential excessive braking by pre-positioning brake components and pre-charging hydraulic systems during normal operation. When collision risk increases, the system can rapidly transition to high-force braking without the full transient response time, reducing stress on the braking system by avoiding sudden force application.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Methods and systems of braking a vehicle. One method includes determining, with a first electronic processor (14), whether the vehicle (12) is in a collision state or a non-collision state. The method also includes determining, with the first electronic processor (14), an amount of deceleration needed to avoid a collision with a first object. The method also includes determining, with a second electronic processor (30), whether an electronic parking brake (31) has been activated. Responsive to determining that the electronic parking brake (31) is activated and the vehicle is in the collision state, the method also includes controlling, with the second electronic processor (30), the electronic parking brake (31) to provide an amount of deceleration of the vehicle (12) based on the amount of deceleration needed to avoid a collision with a first object and a predetermined maximum amount of deceleration of the electronic parking brake.