Vehicle Cornering Speed Control Based on Curve Radius
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Solution Overview
Problem
Current speed regulation systems in partially self-driving vehicles do not effectively incorporate the driver's wishes regarding speed adjustments during curve navigation, leading to potential traffic flow disruptions and safety concerns, as they require manual intervention and do not adequately anticipate the driver's desire for minimal speed difference between the setpoint and deceleration speed.
Innovation Solution
A method that determines the maximum transverse acceleration and corresponding deceleration speed for a vehicle based on the speed setpoint and radius of curvature, allowing for automatic adaptation of deceleration speed in curves, thereby anticipating the driver's preference for a smaller speed difference between the setpoint and deceleration speed, especially when the setpoint speed is high.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the speed regulation system automatically reduces speed to a fixed deceleration speed when detecting a curve, then passenger comfort is improved, but the driver's preference for minimal speed difference between setpoint and deceleration speed is not met
Solution Approach 1:
The system dynamically adjusts the deceleration speed based on the detected radius of curvature, making the speed reduction adaptive rather than fixed. The computer calculates and modifies the deceleration speed in real-time according to the curve characteristics, allowing the system to balance comfort with driver preferences for different curve scenarios
Solution Approach 2:
The system changes the speed parameter dynamically by calculating a modified deceleration speed that maintains a minimal difference from the speed setpoint. This parameter adjustment is based on the radius of curvature detection, transforming the fixed speed reduction into a variable parameter that adapts to both comfort and driver preference requirements
2Reliability
If the vehicle slows down to a fixed deceleration speed in curves, then curve passage safety is improved, but traffic flow disruption and potential dangerous situations increase
Solution Approach 1:
The system dynamically determines the deceleration speed based on the detected radius of curvature, creating a flexible speed adjustment that responds to actual road conditions. This dynamic approach prevents excessive or unnecessary slowing down while maintaining safety margins, thereby reducing traffic flow disruptions
Solution Approach 2:
The computer modifies the deceleration speed parameter to maintain it close to the speed setpoint, changing the fixed speed reduction into a variable parameter. This parameter optimization ensures safety by maintaining adequate speed differences for curve negotiation while minimizing harmful traffic flow disruptions through intelligent speed selection
3Ease of operation
If manual intervention is required to adjust speed setpoint, then driver control is maintained, but ease of operation and responsiveness to driver's wishes deteriorate
Solution Approach 1:
The system performs self-adjustment of the deceleration speed by automatically detecting the radius of curvature and calculating the optimal speed modification. This self-service capability eliminates the need for manual driver intervention while still respecting driver preferences, as the system autonomously optimizes the speed parameter based on detected conditions
Solution Approach 2:
The computer continuously monitors the radius of curvature and uses this feedback to automatically adjust the deceleration speed. This feedback loop enables the system to respond immediately to changing road conditions without requiring manual input, maintaining both driver control and operational efficiency through automated responsive adjustment
Data Source
AI summary
Disclosed is a method intended to regulate the speed of a vehicle with at least partially automated driving and knowing the radius of curvature of a future segment which it is about to take on its route. This method comprises a step (10-90) which involves regulating the speed of the vehicle in accordance with a speed setpoint and, in the event that a radius of curvature of the future segment representative of a bend is detected, determining a maximum transverse acceleration that the vehicle can undergo in the bend depending on the speed setpoint, then a maximum speed that the vehicle would have in the bend if it underwent this maximum transverse acceleration in the presence of the detected radius of curvature, then imposing a deceleration phase on the vehicle until a deceleration speed chosen as a function of this determined maximum speed is reached.