Precrash Safety System Signal Filtering and Trigger Suppression
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Solution Overview
Problem
Conventional precrash safety systems in vehicles often trigger occupant protection measures unnecessarily, particularly in rapid succession, leading to annoyance for drivers and not providing additional safety benefits, and lack scalability to integrate new input and output variables.
Innovation Solution
A method and device that utilize precrash severity indicators to filter and prioritize input signals, suppressing lower-priority indicators temporarily to prevent multiple triggering of occupant protection measures, while allowing higher-priority indicators to trigger measures like belt tensioning, window closing, and seat adjustments, using a countdown timer to manage suppression periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the belt tensioner is triggered every time a critical driving state is detected, then occupant safety is improved, but unnecessary multiple triggering occurs causing annoyance and waste
Solution Approach 1:
The system performs preliminary evaluation of the critical driving state by checking whether a predetermined period has elapsed since the last triggering. This preliminary check prevents unnecessary multiple triggering while ensuring that genuine safety-critical events are still responded to, thus resolving the contradiction between safety and harmful effects
Solution Approach 2:
The system uses feedback from the timing mechanism to monitor the elapsed period since the last belt tensioner activation. This feedback loop ensures that the belt tensioner is only triggered when a sufficient time period has passed, preventing Annoyance from repeated triggering while maintaining safety response capability
2Adaptability or versatility
If the precrash safety system is expanded to include additional input and output variables, then system functionality and adaptability are improved, but system complexity increases
Solution Approach 1:
The control device is designed with a universal evaluation mechanism that can handle multiple types of input signals (sensor signals, driving dynamics data) and control multiple types of output actuators (belt tensioners, window regulators, seat adjustors). This multi-functional design allows the system to be expanded with additional variables without fundamentally changing the system architecture, thus improving adaptability while managing complexity
Data Source
AI summary
In a method for controlling at least one reversible occupant protection measure of a precrash safety system, in particular a reversible belt tensioner, a plurality of input signals are received, wherein the input signals indicate a potential risk of an accident. The input signals are mapped onto a plurality of different precrash severity indicators. Each precrash severity indicator indicates an expected probability and/or severity of the accident. The precrash severity indicators are additionally filtered such that upon occurrence of a precrash severity indicator, a subsequent precrash severity indicator is suppressed for a period of time. Then, the at least one reversible occupant protection measure, for example, the belt tensioning, is triggered as a function of the filtered precrash severity indicators.