Longitudinal Driver Assistance Speed Adaptation Notification
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Solution Overview
Problem
Existing longitudinal driver assistance systems lack an effective acceptance and refusal strategy for drivers, leading to potential inaccuracies in speed adjustments due to partially incorrect map data and a lack of driver control over automatic interventions.
Innovation Solution
A system that includes a capture unit for detecting upcoming events and a functional unit to notify the driver of impending speed changes, allowing for acceptance or refusal, with multiple intervention points and adjustable parameters to ensure driver control over speed adjustments, including the option to define custom speed limits and profiles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If automatic adaptation of maximum permissible top speed is implemented without driver notification, then productivity is improved through automated speed control, but reliability deteriorates due to potential inaccuracies from incorrect map data and lack of driver oversight
Solution Approach 1:
The system implements a feedback mechanism by notifying the driver of upcoming speed changes through visual, acoustic, or haptic signals. This allows the driver to verify the appropriateness of the automatic speed adaptation based on their own observation of road conditions, thereby correcting potential errors from incorrect map data while maintaining automated control efficiency
Solution Approach 2:
The system performs preliminary action by notifying the driver in advance of upcoming speed changes at a first location before the actual speed adjustment occurs at a second location. This advance notification allows the driver to mentally prepare and verify the necessity of the speed change, improving reliability while maintaining productivity
2Reliability
If multiple notification stages and refusal opportunities are implemented, then reliability is improved through driver control, but device complexity increases due to multiple intervention points and parameters
Solution Approach 1:
The notification and control process is segmented into distinct stages: a first notification at a first location with first refusal opportunity, and a second notification at a second location with second refusal opportunity. This segmentation allows the driver to intervene at multiple points without requiring complex continuous control mechanisms
Solution Approach 2:
The system dynamically adapts the level of automation based on driver response. When the driver refuses automatic adaptation at either notification stage, the system switches to manual control mode. This dynamic adjustment allows for simplified control when automatic mode is accepted, while providing enhanced reliability when driver intervention is requested
Data Source
AI summary
A longitudinal driver assistance system in a motor vehicle includes a capture system configured to detect upcoming relevant events which require adaptation of a predefined maximum permissible top speed, and a functional unit which, upon detecting an upcoming relevant event, is configured to determine, based on a location of the upcoming relevant event, a first location or first time, the reaching of which causes the functional unit to output a notification to a driver of the vehicle relating to an automatic adaptation of the maximum permissible top speed. The functional unit is also configured to determine a second location or time to be reached after the first location or first time, respectively, the reaching of which causes the functional unit to intervene in a longitudinal guidance of the motor vehicle in a direction of a new maximum permissible top speed at the location of the upcoming relevant event if there is no driver-initiated refusal of the automatic adaptation of the maximum permissible top speed. Upon detecting the upcoming relevant event, the functional unit is configured to determine a third location or third time to be reached after the second location or second time, respectively, up to which point a driver-initiated refusal of the automatic adaptation of the maximum permissible top speed is permitted.