Vehicle Side Collision Airbag Threshold Control
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Solution Overview
Problem
Existing occupant protection devices for vehicles may fail to initiate protection in time during side collisions due to high thresholds set to prevent erroneous operations, leading to delayed activation and potential insufficient protection from collisions with objects approaching at high speeds.
Innovation Solution
An occupant protection device comprising a side collision prediction system, physical quantity detection, and an electronic control unit that operates the airbag based on a first threshold for immediate activation and a second, lower threshold for prolonged detection after predicting an inevitable collision, allowing for timely airbag deployment even with smaller detection values and varying collision positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high threshold is set for the side collision sensor to prevent erroneous operations, then false activation is suppressed, but the airbag deployment is delayed in high-speed side collisions
Solution Approach 1:
The system performs preliminary action by predicting inevitable collisions in advance using radar or camera detection. When a collision is predicted, the ECU switches to a lower second threshold for the side collision sensor, enabling earlier airbag deployment preparation before the actual collision occurs, thus resolving the time delay issue without increasing false activation risk
Solution Approach 2:
The threshold value is made dynamic rather than fixed. The ECU switches between the first threshold (higher, for normal operation) and the second threshold (lower, for predicted collisions) based on the collision prediction result. This dynamic adjustment allows the system to optimize between false activation suppression and rapid response depending on the situation
2Loss of time
If a low threshold is set for the side collision sensor to enable early detection, then airbag deployment timing is improved, but erroneous operations increase
Solution Approach 1:
The collision prediction device acts as an intermediary that validates whether a low-threshold detection event is genuine. The ECU only switches to the lower second threshold when the prediction device confirms an inevitable collision, serving as a gatekeeper that prevents false activation while enabling early response for real collisions
Solution Approach 2:
The detection threshold parameter is changed based on the collision prediction state. The system transitions from using the first threshold to the second threshold when a predicted collision occurs, allowing the parameter to adapt to different operational conditions and resolve the contradiction between early detection and false activation
3Measurement precision
If the threshold is set to detect minor collisions, then detection sensitivity is improved, but the system cannot distinguish between minor and significant collision events
Solution Approach 1:
The threshold system is segmented into two distinct levels: the first threshold for normal operation and the second threshold for predicted collisions. This segmentation allows the system to handle different collision scenarios appropriately, maintaining both sensitivity and discrimination capability across various collision types
4Reliability
If the airbag deployment threshold is raised to ensure significant collision detection, then false deployment is reduced, but protection is insufficient for high-speed impacts
Solution Approach 1:
By predicting inevitable collisions in advance, the system prepares for high-speed impacts before they occur. The ECU switches to the lower second threshold upon prediction, ensuring the airbag can deploy effectively for high-speed collisions while maintaining the higher first threshold for normal operation, thus providing both false deployment reduction and adequate protection strength
Data Source
AI summary
There is provided an occupant protection device for a vehicle, the occupant protection device including a side collision prediction device configured to predict a collision with a side of a host vehicle and output a prediction result including determination about whether or not the predicted collision is an inevitable collision, a physical quantity detection device configured to detect a physical quantity related to the collision with the side of the host vehicle and output a detection value of the physical quantity, an airbag device configured to expand to protect an occupant of the vehicle when the airbag device is operated, and an electronic control unit.