Vehicle Distance Control Using V2X-Based Following Distance Modes
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Solution Overview
Problem
Current distance control systems in vehicles, particularly in platooning scenarios, rely on driver reaction time for setting target following distances, which can lead to longer distances and reduced fuel efficiency due to latency in V2X data transmission, necessitating a method to determine target distances independently of driver reaction time for safer and more efficient convoy driving.
Innovation Solution
A method for controlling a subject vehicle's distance control system that activates a second operating mode where the target following distance is set based on V2X data exchange, allowing vehicles to move closer together by disregarding driver reaction time, ensuring safe and efficient convoy operation without a central coordinator or lead vehicle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If driver reaction time is used to determine target following distance, then safety is ensured through adequate braking distance, but actual following distance increases reducing fuel efficiency
Solution Approach 1:
The patent replaces the mechanical driver reaction system with an automated V2X communication-based control system. The distance control device directly receives braking capacity data from the vehicle ahead via V2X connection and automatically determines target following distance based on this data, eliminating the need for driver reaction time and enabling shorter, more fuel-efficient following distances while maintaining safety.
Solution Approach 2:
The patent introduces V2X communication as an intermediary between vehicles to transmit braking capacity data. This intermediary system enables direct information exchange about vehicle dynamics, allowing the distance control device to calculate appropriate following distances without relying on driver reaction time, thus resolving the contradiction between safety and fuel efficiency.
2Loss of time
If V2X data transmission latency is reduced, then coordinated platoon driving at shorter distances becomes possible, but reliability of data exchange must be maintained
Solution Approach 1:
The patent employs multiple redundant V2X communication channels and uses the most reliable available connection for critical data exchange. By having backup communication paths ready, the system can quickly switch if one channel fails, maintaining reliability while minimizing latency through optimized data transmission protocols.
Data Source
AI summary
A method for controlling a subject vehicle with a braking system, a drive system and a distance control system, wherein the distance control system is configured to control an actual following distance between the subject vehicle and a vehicle ahead to a predetermined target following distance, wherein the target following distance is predetermined as a function of an activated operating mode of the distance control system, including performing a plausibility check by checking whether V2X data is exchanged or can be exchanged between the vehicle ahead and the subject vehicle over a V2X connection, and activating, if no V2X data is exchanged or can be exchanged between the vehicle ahead and the subject vehicle over the V2X connection, a first operating mode in which a first target following distance is predetermined as a function of a reaction time of a driver of the subject vehicle.