Adaptive Cruise Control During Target Vehicle Detection Loss
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing adaptive speed regulation systems in autonomous vehicles face issues during loss of target vehicle detection, leading to uncomfortable and unsafe driving conditions due to abrupt accelerations or braking when detection is regained.
Innovation Solution
A method that calculates a relevance indicator to characterize the probability of target vehicle presence, maintaining compatible movement of the ego-vehicle based on last known information, and updates this indicator to adapt the autonomous driving setpoint, ensuring smooth transitions when detection is regained.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the ego-vehicle regulates speed to target speed when target vehicle detection is lost, then the ego-vehicle can maintain its predetermined speed, but this leads to strong accelerations that are unpleasant for driver and passengers and do not reflect the actual situation
Solution Approach 1:
The system calculates a relevance indicator in advance to characterize the probability of target vehicle presence before detection is lost. When detection is lost, this pre-calculated indicator allows the system to maintain speed regulation based on the last known target vehicle movement information rather than abruptly switching to target speed regulation, thereby avoiding sudden accelerations and maintaining driver comfort.
2Speed
If the ego-vehicle keeps speed constant for a predetermined period when target vehicle detection is lost, then the ego-vehicle maintains stable speed, but when target vehicle is detected again it will be very close to the ego-vehicle forcing driver to take control and brake
Solution Approach 1:
The system performs preliminary calculation of the relevance indicator and maintains speed regulation based on last known target vehicle movement information during the detection loss period. This preliminary preparation ensures that when the target vehicle is detected again, the ego-vehicle is already moving at a compatible speed, maintaining safe distance without requiring abrupt driver intervention.
Solution Approach 2:
The system continuously monitors detection status and uses feedback from the relevance indicator to dynamically adjust speed regulation. When detection is lost, the feedback mechanism allows the system to switch to maintaining compatible movement based on last known information, and when detection is regained, it seamlessly transitions back to target vehicle-based regulation, ensuring continuous safety.
3Ease of operation
If the system uses last known movement information to calculate autonomous driving setpoint when detection is lost, then the ego-vehicle maintains compatible movement with target vehicle, but this requires maintaining detection probability information
Solution Approach 1:
The relevance indicator serves as an intermediary element that bridges the detection system and the speed regulation system. It characterizes the probability of target vehicle presence in a simplified manner, allowing the speed regulation system to make informed decisions during detection loss without requiring complex detection system modifications. This intermediary enables smooth transition between different regulation modes while maintaining driver comfort.
Data Source
AI summary
The invention relates to an autonomous driving method for a motorized land vehicle, called an ego-vehicle 102, by adaptive speed regulation based on a target speed. The method is suitable for detecting a first target vehicle 104 and for calculating a relevance indicator for the first target vehicle 104, which is configured to characterize a probability of presence of the first target vehicle. Upon detection of a loss of detection of the first target vehicle 104 and if the relevance indicator is greater than a predetermined deselection value, the method calculates an autonomous driving setpoint using the information on the movement of the first vehicle target 104, the target speed and the speed of the ego-vehicle 102.