Longitudinal Driver Assistance Speed Adaptation Timing
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Solution Overview
Problem
Existing longitudinally guiding driver assistance systems may cause unexpected accelerations or decelerations, leading to awkward situations for the driver and potential impairments to rear traffic, as they adapt the vehicle's speed based on detected events without considering the route's context, such as upcoming turns or traffic circles.
Innovation Solution
A driver assistance system that includes a detection system for relevant events and a function unit that determines a location-dependent point in time for adapting the permissible maximum speed, taking into account route information like recommended speeds for specific route sections and angles, to initiate automatic or manual adjustments only when necessary and safe, thereby preventing undesired accelerations or decelerations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the driver assistance system automatically adapts the vehicle's speed based on detected events without considering route context, then the speed adaptation responds quickly to detected events, but it causes unexpected accelerations or decelerations that create awkward situations for the driver and may impair rear traffic
Solution Approach 1:
The system performs preliminary analysis of route context (upcoming turns, traffic circles, road geometry) before executing speed adaptation. The function unit determines whether speed adaptation is appropriate by evaluating route information in advance, preventing premature or inappropriate speed changes that would cause driver discomfort or traffic impairment.
Solution Approach 2:
Route context information acts as an intermediary between the detected event and the speed adaptation decision. The function unit uses route data (turns, traffic circles, road geometry) as a mediating factor to determine whether and how to adapt speed, ensuring that speed changes are contextually appropriate and do not create awkward situations.
2Productivity
If the system adapts speed early upon detecting events, then it maintains optimal speed for the detected event location, but it may cause premature accelerations or decelerations that are uncomfortable for the driver and disruptive to rear traffic
Solution Approach 1:
The system performs preliminary route context analysis before executing speed adaptation to determine the optimal timing. By evaluating upcoming route features in advance, the system delays speed adaptation until the appropriate moment, preventing premature changes that would discomfort the driver while still maintaining productivity by optimizing speed for the detected event location.
Solution Approach 2:
The system dynamically adjusts the timing of speed adaptation based on route context. Rather than using a fixed adaptation schedule, the function unit flexibly determines when to adapt speed by considering dynamic factors such as upcoming turns, traffic circles, and road geometry, thereby balancing productivity with driver comfort.
3Device complexity
If the system does not consider route information when adapting speed, then the system structure remains simple, but it causes unexpected speed changes that create awkward situations for the driver and may impair rear traffic
Solution Approach 1:
The function unit serves multiple functions: it detects events, analyzes route context, determines appropriate speed adaptation timing, and executes speed changes. By combining these functions in a single multi-functional unit, the system maintains relative structural simplicity while incorporating route context consideration to ensure reliable and appropriate speed adaptation.
Solution Approach 2:
The system performs preliminary route context analysis as an integrated step within the function unit before executing speed adaptation. This preliminary action is built into the core decision-making process, allowing the system to maintain simplicity while ensuring that speed changes are contextually appropriate and do not create awkward situations.
Data Source
AI summary
A longitudinally guiding driver assistance system in a motor vehicle has a first detection system for detecting currently applying events or relevant events lying ahead, which require a change of the permissible maximum speed, a second detection system for detecting the course of the route, and a function unit which, when detecting a relevant event while taking into account the location of the relevant event, determines a location-dependent point in time, whose reaching causes the function unit to initiate an automatic adaptation of the currently permissible maximum speed or an output of a prompt information for permitting an automatic adaptation of the currently permissible maximum speed to anew permissible maximum speed. The function unit is designed to take into account available information concerning the course of the route when determining the location-dependent point in time.