Target Vehicle Selection During Lateral Motion in Driver Assistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing autonomous vehicle systems face challenges in maintaining the selection of a target vehicle when the vehicle makes lateral movements, leading to oscillations in speed regulation and difficulty in finding a compromise between speed regulation and lane keeping systems.
Innovation Solution
A method and device that utilize a camera and sensors to detect lateral movements and determine the presence and position of objects relative to the vehicle, maintaining target vehicle selection based on predetermined thresholds, ensuring smooth speed regulation even during lateral movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the LKA system is made highly responsive and predictive for lane change detection, then lane keeping performance is improved, but the ACC system becomes less stable and loses target vehicle selection more frequently
Solution Approach 1:
The system dynamically adjusts the responsiveness of target vehicle selection based on lateral movement detection. When lateral movement exceeding a threshold is detected, the system reduces responsiveness to maintain target vehicle selection stability. When lateral movement is within normal bounds, the system maintains high responsiveness for accurate lane change detection. This dynamic adjustment resolves the contradiction by making the system behavior adaptive to current driving conditions.
Solution Approach 2:
The system changes the parameter of target vehicle selection responsiveness based on the detected lateral movement magnitude. A threshold-based parameter adjustment is implemented: if lateral movement exceeds the threshold, the responsiveness parameter is reduced to maintain stable target vehicle selection; otherwise, normal responsiveness is maintained. This parameter change strategy allows the system to optimize both lane change detection accuracy and target vehicle selection stability under different operating conditions.
2Stability of the object's composition
If the ACC system maintains strict target vehicle selection to ensure stable speed regulation, then speed control accuracy is improved, but the system fails to respond appropriately to genuine lane changes
Solution Approach 1:
The system dynamically adjusts target vehicle selection stability based on lateral movement detection. During normal lateral movements within acceptable thresholds, the system maintains strict target vehicle selection to ensure stable speed regulation. When lateral movements exceed the threshold indicating genuine lane changes, the system relaxes the selection criteria to adapt to the new situation. This dynamic behavior allows the system to maintain both speed regulation stability and lane change response capability.
Solution Approach 2:
The system changes the target vehicle selection maintenance parameter based on lateral movement magnitude. When lateral movement is within threshold, the system maintains strict target vehicle selection with high stability parameter. When lateral movement exceeds threshold, the system reduces the stability parameter to allow target vehicle reselection. This parameter adjustment enables the system to balance speed regulation stability with adaptability to lane changes.
3Measurement precision
If the system frequently updates target vehicle selection to track the closest vehicle, then tracking accuracy is improved, but oscillations occur in speed regulation during lateral movements
Solution Approach 1:
The system dynamically adjusts the frequency of target vehicle selection updates based on lateral movement detection. During lateral movements exceeding the threshold, the system reduces update frequency to prevent oscillations in speed regulation. When lateral movement is within normal bounds, the system maintains high update frequency for accurate target vehicle tracking. This dynamic update strategy resolves the contradiction between tracking accuracy and speed regulation smoothness.
Solution Approach 2:
The system changes the target vehicle selection update frequency parameter based on lateral movement magnitude. When lateral movement exceeds threshold, the update frequency parameter is reduced to maintain speed regulation smoothness. When lateral movement is within threshold, normal high-frequency updates are maintained for accurate tracking. This parameter adjustment enables the system to optimize both tracking precision and speed control stability under different driving conditions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Ensures stable speed control by detecting the absence of lane changes, reducing abrupt speed variations, and simplifying system settings by maintaining target vehicle focus during lateral maneuvers.
Implementation Method 1
detection, by a camera, of said lateral displacement of the ego-vehicle
Implementation Method 2
detection, by a sensor based on a measurement of a reflection of a wave emitted by said sensor, of an object located to the left or right of said ego-vehicle
Data Source
Figure 1
Figure 2
AI summary
The invention relates to a method and a device for maintaining the selection of a target vehicle by a driving assistance system carried on-board an ego vehicle, said method comprising the steps of: ▪ Detecting (201) said lateral movement; ▪ Detecting (202) an object situated to the left or to the right of said ego vehicle and the probability of presence thereof; ▪ Determining (203) a relative lateral distance between said ego vehicle and said detected object; ▪ If said probability of presence is above a predetermined threshold, then if the detected object is on the movement side, as long as said relative lateral distance is above a first threshold (204) then selection of said target vehicle is maintained (205), and if the detected object is on the opposite side, then as long as said relative lateral distance is below a second threshold (204) then the selection of the target vehicle is maintained (205).