Adaptive Cruise Control Weighting for Smooth Cut-In Deceleration
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Solution Overview
Problem
Existing adaptive cruise control systems cause passenger discomfort and safety risks by sudden deceleration when another vehicle cuts in too closely, failing to adequately consider both distance and speed differences.
Innovation Solution
A method and device that adjust acceleration commands by weighting target acceleration values based on inter-vehicle time and speed difference, using specific weighting coefficients to minimize deceleration and maintain safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ACC system generates a high target deceleration value when another vehicle cuts in closely, then the safety distance is maintained, but passenger comfort deteriorates due to sudden deceleration
Solution Approach 1:
The system dynamically changes the weighting coefficient between distance-based deceleration and speed-difference-based deceleration based on real-time conditions. When speed difference is significant, the system reduces the overall deceleration magnitude by adjusting parameters, thereby maintaining safety while improving comfort.
Solution Approach 2:
The acceleration command is made dynamic by continuously adjusting the weighting coefficient based on the relationship between distance and speed difference. This dynamic adjustment allows the system to adapt to changing traffic conditions, reducing sudden decelerations when appropriate while maintaining safety when necessary.
2Reliability
If the ACC system prioritizes maintaining safe distance through high deceleration, then safety is improved, but ride smoothness deteriorates
Solution Approach 1:
The system changes the deceleration parameter dynamically by adjusting the weighting coefficient based on real-time measurements of distance and speed difference. This parameter adjustment ensures smooth deceleration profiles while maintaining safe distances.
Solution Approach 2:
The system uses feedback from distance and speed difference measurements to continuously adjust the acceleration command. This closed-loop control ensures that deceleration is applied smoothly and appropriately, maintaining both safety and ride quality.
3Device complexity
If the ACC system uses only distance-based control, then the control logic is simple, but the system fails to account for speed differences causing unnecessary sudden braking
Solution Approach 1:
The system merges distance-based control and speed-difference-based control into a unified acceleration command framework. By combining these two control approaches with a weighting coefficient, the system achieves comprehensive control that prevents unnecessary braking while maintaining manageable complexity.
Data Source
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AI summary
The invention relates to a method and a device for controlling the acceleration of a vehicle (10). For this purpose, a vehicle (10) detects the presence of another vehicle (11) preceding it at a distance (101) below a threshold value. A target acceleration value is determined according to the distance (101) and/or an inter-vehicle distance or time (TIV) to be observed relative to the vehicle (11). An acceleration setpoint for the adaptive cruise control system of the vehicle (10) is determined by weighting the target acceleration value by a predetermined weighting coefficient. The predetermined weighting coefficient advantageously corresponds to the maximum between a first weighting coefficient, which is a function of the distance between the vehicles (10, 11), and a second weighting coefficient, which is a function of the difference in speed between the vehicles (10, 11).