Early Brake Light Warning for Autonomous Vehicles
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Solution Overview
Problem
Autonomous driving vehicles lack an effective solution to provide trailing vehicles with sufficient time to respond to sudden braking by leading vehicles, leading to potential collisions.
Innovation Solution
The implementation of a system that anticipates braking points on a trajectory and activates the brake lights of the leading vehicle 2 seconds prior to actual braking, using a combination of previous driving statistics and calculated decelerations to identify discrete points where braking is expected, thereby warning trailing vehicles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If brake lights are activated only during actual braking, then energy consumption is minimized, but trailing vehicles do not have sufficient time to respond to sudden braking
Solution Approach 1:
The system performs preliminary action by activating brake lights before actual braking occurs. The controller identifies upcoming braking events using trajectory data and deceleration calculations, then activates the brake lights at predetermined time intervals (e.g., 2 seconds) before the braking point is reached. This early activation gives trailing vehicles sufficient time to perceive the warning and respond appropriately, while limiting the duration of brake light activation to only the warning period rather than continuous operation.
2Reliability
If brake lights are activated earlier to warn trailing vehicles, then collision risk is reduced, but the braking system complexity increases
Solution Approach 1:
The system employs feedback mechanisms by continuously monitoring trajectory data, calculating expected decelerations at discrete points, and comparing these calculations with actual vehicle behavior. The controller uses this feedback loop to accurately identify braking points and determine the appropriate timing for brake light activation. This feedback-based approach enables reliable collision avoidance through early warning while maintaining system simplicity by leveraging existing sensor and control infrastructure.
3Measurement precision
If the system uses calculated decelerations to identify braking points, then braking accuracy is improved, but computational requirements increase
Solution Approach 1:
The system applies partial action by calculating deceleration values only at specific discrete points along the trajectory rather than continuously across all possible positions. The controller identifies key braking points where deceleration thresholds are exceeded, activating brake lights only at these critical moments. This approach achieves sufficient braking point identification accuracy for safety purposes while minimizing computational energy consumption by avoiding exhaustive calculations at every possible location and time interval.
Data Source
AI summary
In one embodiment, the invention describes a method of providing advance braking warning before an ADV reaches a point where the ADV is expected to brake. The method enables brake lights to be turned on before actual braking occurs, thus providing trailing vehicles more time to respond. According to the method, a trajectory is generated at a starting point. The trajectory includes a number of discrete points that the ADV is to follow. One or more discrete points are identified from the number of discrete points where the ADV is expected to brake based on previous driving statistics and calculated decelerations. At a predetermined time prior to reaching each of the identified discrete points, the ADV can turn on its brake lights to warn trailing vehicles that the ADV is about to brake so that the trailing vehicle can start to respond earlier.