Adaptive Safety System Triggering Threshold for Vehicle Dynamics
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Solution Overview
Problem
Conventional preventatively acting safety systems in motor vehicles have a triggering behavior that is subjective and insensitive at high vehicle speeds or accelerations, leading to inconsistent activation of safety devices in critical driving situations.
Innovation Solution
The triggering threshold value for the safety system is adapted based on total vehicle acceleration and vehicle speed, with separate considerations for high and low coefficients of friction, allowing for dynamic adjustment of the threshold value to better match the driving state and user perception of danger.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed triggering threshold value is used for the safety system, then the system is simple to operate and understand, but the system becomes insensitive at high vehicle speeds or accelerations
Solution Approach 1:
The patent applies the dynamics principle by making the triggering threshold value variable rather than fixed. The threshold is dynamically adjusted based on detected driving parameters including vehicle speed, longitudinal acceleration, and lateral acceleration. This allows the safety system to adapt its sensitivity to match the driver's subjective perception of danger at different operating conditions, resolving the contradiction between ease of operation and triggering reliability.
Solution Approach 2:
The patent implements parameter changes by modifying the triggering threshold value based on detected driving parameters. Specifically, the threshold is adjusted as a function of vehicle speed, longitudinal acceleration, and lateral acceleration. This parameter adaptation ensures the system maintains appropriate sensitivity across different driving scenarios, improving reliability without complicating the underlying safety function.
2Reliability
If the triggering threshold value is lowered to increase sensitivity at high speeds, then occupant protection is improved, but false activations may increase
Solution Approach 1:
The patent uses parameter changes to adjust the triggering threshold based on multiple detected parameters including vehicle speed, longitudinal acceleration, and lateral acceleration. By considering the combination of these parameters rather than using a single fixed threshold, the system can distinguish between normal high-speed driving and actual critical situations, reducing false activations while maintaining high sensitivity when needed.
Solution Approach 2:
The system employs feedback by continuously monitoring driving parameters and using this information to adapt the triggering threshold in real-time. The detected parameters provide feedback about the current driving state, allowing the system to adjust its sensitivity appropriately and avoid false activations while ensuring adequate protection when genuine risks are present.
3Adaptability or versatility
If the safety system is activated at low vehicle speeds, then the system is highly sensitive to driver needs, but the system becomes comparatively insensitive at high vehicle speeds
Solution Approach 1:
The patent applies dynamics by making the triggering threshold adaptive to vehicle speed and acceleration conditions. The threshold value changes dynamically based on the detected driving state, ensuring the system maintains consistent reliability across the full range of operating speeds rather than being optimized only for low-speed conditions.
Solution Approach 2:
The system implements parameter changes by adjusting the triggering threshold as a function of vehicle speed, longitudinal acceleration, and lateral acceleration. This parameter adaptation ensures the system behaves consistently across different speed ranges, resolving the contradiction between speed adaptability and triggering consistency.
Data Source
AI summary
A preventatively acting safety system for a motor vehicle comprises safety devices which are actuated as a function of information which is recorded by a driving situation detection device by means of a driving state sensor system and is evaluated in a data evaluation device. The recorded information are compared with at least one triggering threshold value and the safety devices being actuated when the triggering threshold value is exceeded. The triggering threshold value is adapted as a function of a total vehicle acceleration and a vehicle speed, to correspond to a degree of danger felt by a vehicle occupant.