Airbag Sensor Attachment Structure for Early Collision Detection
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Solution Overview
Problem
Existing airbag sensor attachment structures face challenges in detecting collisions at an early stage during full overlap frontal or offset collisions due to the airbag sensor's placement inside the bumper beam extension, leading to delayed detection and potential erroneous readings.
Innovation Solution
An airbag sensor attachment structure is designed with a support section on the external face of the bumper beam extension that retreats during compression, allowing the airbag sensor to detect collisions precisely and early by being attached to this support section, which includes a stay with a hat-shaped configuration and a bracket with a small projection amount to enhance anti-vibration performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the airbag sensor is housed inside the bumper beam extension, then working space is secured for assembly, but collision detection is delayed until the bumper beam extension is compressed
Solution Approach 1:
A support section acts as an intermediary between the bumper beam extension and the airbag sensor. The support section includes a stay with a hat-shaped cross-section that engages with the bumper beam extension, allowing the sensor to be positioned externally while still responding to compression through the intermediary mechanical connection.
Solution Approach 2:
The airbag sensor is repositioned from the internal space of the bumper beam extension to an external location on its surface. This dimensional change allows the sensor to be supported by the external face of the bumper beam extension, enabling early collision detection while maintaining proper assembly space through the intermediary support structure.
2Strength
If the airbag sensor is attached to the flange of the bumper beam extension, then the sensor is securely mounted, but collision detection is delayed during the initial stage
Solution Approach 1:
The support section provides localized engagement with the bumper beam extension through the hat-shaped stay that fits into a corresponding recess. This local quality approach allows the sensor to be securely mounted at a specific location on the external face while maintaining the ability to detect early-stage collisions through the localized mechanical connection.
3Ease of operation
If a bracket is extended from the flange as far as the front wall of the bumper beam extension, then the airbag sensor can be supported, but the bracket becomes susceptible to vibration and increases weight
Solution Approach 1:
The support function is extracted from a long cantilevered bracket and concentrated into a compact hat-shaped stay with a recess. This extraction eliminates the need for a long extending bracket, reducing weight and vibration susceptibility while maintaining the ability to support the airbag sensor on the external face of the bumper beam extension.
Data Source
AI summary
A vehicle body front section structure is provided with a sensor attachment structure to an outside face of a left bumper beam extension. The sensor attachment structure includes a support section provided on the outside face of the left bumper beam extension, and an airbag sensor attached to the support section. The support section deforms and retreats toward the vehicle body rear as a result of compression of the left bumper beam extension during compression of the left bumper beam extension due to an impact load input from the vehicle body front.