Rollover Restraint Control With Off-Road Event Discrimination
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Solution Overview
Problem
Current vehicle safety systems face challenges in accurately discriminating between rollover events and off-road maneuvers, leading to potential inadvertent actuation of safety devices during off-road use.
Innovation Solution
A vehicle safety system that includes a controller configured to execute off-road detection and rollover discrimination metrics, using roll rate, roll angle, and acceleration metrics to differentiate between normal and off-road rollover events, and deploy safety devices accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rollover detection algorithms are made more sensitive to detect all potential rollover events, then rollover detection capability is improved, but false activation during off-road maneuvers increases
Solution Approach 1:
The detection system is segmented into multiple independent metrics: roll rate metric, roll angle metric, and off-road metric. Each metric independently evaluates different aspects of vehicle behavior, and their combined evaluation enables discrimination between true rollovers and off-road maneuvers, reducing false activations while maintaining detection sensitivity
Solution Approach 2:
The off-road metric acts as an intermediary that modifies the interpretation of roll rate and roll angle metrics. When off-road conditions are detected, the system adjusts its discrimination thresholds, allowing the same roll rate or roll angle values to be interpreted differently depending on the operational context
2Object-affected harmful factors
If discrimination algorithms are enhanced to accurately distinguish off-road maneuvers from rollover events, then false activation is reduced, but system complexity increases
Solution Approach 1:
The system changes parameters (thresholds and weighting factors) of the discrimination algorithms based on the off-road metric output. Rather than using fixed thresholds, the system dynamically adjusts them according to detected off-road conditions, simplifying the overall logic while improving accuracy
Solution Approach 2:
The discrimination thresholds are made dynamic rather than static. The system transitions between different operational modes (normal vs. off-road) with different threshold sets, allowing the same hardware and basic algorithms to adapt to varying operational contexts without requiring entirely separate detection systems
Data Source
AI summary
A method for controlling actuation of an actuatable restraint in response to a vehicle rollover event includes detecting whether the vehicle (12) is being driven off-road. The method also includes determining whether the vehicle (12) is undergoing a roll event (99) that would warrant actuation of the actuatable restraint (20) if the vehicle was being driven on-road. The method further includes actuating the actuatable restraint (20) in response to determining that a roll acceleration (D RATE) of the vehicle (20) indicates that the roll event is continuing. A vehicle safety system (10) includes an actuatable restraint and a controller (50) configured to control actuation of the actuatable restraint according to this method.