Longitudinal Driver Assistance Curve Speed Control
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Solution Overview
Problem
Existing longitudinal driver assistance systems struggle to manage vehicle speed effectively through curves without driver intervention, especially when the lead vehicle is lost or when driving in free lane, leading to potential acceleration instead of braking, which can be unsafe.
Innovation Solution
The method involves using future road course data, including curve information, to automatically adjust vehicle speed, allowing the system to brake on curves without a self-braking lead vehicle, ensuring smooth navigation through winding roads without driver intervention by determining a comfort curve speed and prioritizing acceleration recommendations from various calculation modules to maintain safety and comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ACC system relies on the lead vehicle to trigger braking, then the system can maintain simple control logic, but the system fails to brake on curves when the lead vehicle is lost or in free lane driving
Solution Approach 1:
The system performs preliminary action by determining curve data from map information in advance before the vehicle actually enters the curve. This allows the system to prepare the comfort curve speed and braking strategy beforehand, ensuring reliable braking on curves even when no lead vehicle is present, without requiring complex real-time decision logic during curve negotiation
2Reliability
If the system brakes early based on map data, then the system can ensure safe curve negotiation, but the braking may occur too early or be unnecessarily aggressive
Solution Approach 1:
The system applies dynamics by continuously adapting the comfort curve speed based on actual vehicle speed, acceleration capabilities, and remaining distance to the curve. The control logic dynamically adjusts braking intensity and timing, ensuring safe curve negotiation while maintaining driving comfort by avoiding overly early or aggressive braking interventions
3Adaptability or versatility
If the system uses multiple calculation modules for speed control, then the system can handle multiple driving scenarios, but the system complexity and coordination difficulty increase
Solution Approach 1:
The system implements universality by designing calculation modules with standardized interfaces and a unified control architecture. The first calculation module (ACC control) and second calculation module (curve speed control) both output acceleration demands that are merged through a priority logic, allowing the system to handle multiple driving scenarios (lead vehicle following, free lane driving, curve negotiation) without increasing coordination complexity
Data Source
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AI summary
Method for operating a longitudinal driver assistance system of a motor vehicle, wherein the speed of the motor vehicle is controlled depending on at least one control data, wherein further control data include curve data relating to at least one curve to be traversed next by the motor vehicle, and wherein a comfort curve speed is determined taking into account the curve data, wherein a target speed of the motor vehicle at a specific point of the curve is determined from the comfort curve speed and taken into account in the speed control.