Adaptive Motor Vehicle Restraint Control via Dynamic Thresholds
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Solution Overview
Problem
Current motor vehicle restraint systems trigger airbags and seatbelt tensioners based on fixed threshold values, failing to adapt to the dynamic severity of accidents, which can lead to suboptimal protection for occupants, especially in head-on collisions.
Innovation Solution
A method and system that control restraint devices by determining movement parameters of the vehicle, such as speed and acceleration, to trigger and adjust the restraining forces of seatbelts and airbags independently, using multiple threshold values and adaptive timing to match the severity of the accident, allowing for dynamic and accident-specific triggering decisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixed threshold values are used for triggering restraint devices, then the triggering decisions are made early and reliably, but the system cannot adapt to the dynamic severity of accidents
Solution Approach 1:
The patent applies dynamics by transitioning from fixed threshold values to dynamic, time-varying threshold functions. The triggering thresholds are no longer static but change over time based on the accident development phase, allowing the system to adapt to evolving accident severity while maintaining reliable triggering decisions throughout the accident sequence
Solution Approach 2:
The patent changes the parameter of triggering thresholds from fixed constant values to time-dependent variable functions. By making the threshold parameters dynamic and adaptive to the accident timeline, the system can respond appropriately to varying severity levels while preserving the reliability established by threshold-based triggering
2Device complexity
If adaptive system components are only actuated upon airbag triggering, then the control logic is simplified, but the further course of the accident is not taken into account
Solution Approach 1:
The patent segments the accident response into multiple independent controllable stages: initial restraint device triggering based on first thresholds, and subsequent adaptive component actuation based on second thresholds. This segmentation allows each stage to be controlled independently with appropriate complexity, while the overall system achieves improved reliability by considering the full accident course
Solution Approach 2:
The patent applies preliminary action by pre-defining multiple sets of triggering thresholds and adaptive component actuation strategies for different accident scenarios. The system is prepared in advance with multiple response protocols, allowing it to select and execute the appropriate sequence based on the actual accident development, thereby improving protection effectiveness without excessive real-time complexity
3Loss of time
If triggering decisions are made very early, then restraint systems can act on occupants in time, but the decisions cannot be adjusted based on the actual course of the accident
Solution Approach 1:
The patent implements periodic action by establishing multiple triggering phases with different threshold criteria: an initial triggering phase with first thresholds for immediate restraint activation, and subsequent phases with second thresholds for adaptive component adjustment. This multi-phase periodic approach ensures timely initial response while allowing later adjustments based on actual accident development
Data Source
AI summary
A method for controlling restraint devices of a motor vehicle includes measuring a movement variable of the motor vehicle, triggering a first restraint device on the basis of a first predefined threshold value for the measured movement variable being exceeded, triggering a second restraint device on the basis of a second predefined threshold value for the measured movement variable being exceeded, and activating a first device influencing the restraining force of the first restraint device and a second device influencing the restraining force of the second restraint device on the basis of the first predefined threshold value and/or the second predefined threshold value being exceeded.