Plate Tension Sensor Aperture Gap Dynamics
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Solution Overview
Problem
Existing vehicle restraint systems face challenges in accurately determining whether a seat is occupied by an adult or a child, leading to inappropriate deployment of airbags due to high tension in seat belts when a child seat is secured, as sensors may misinterpret the child seat as an adult occupant.
Innovation Solution
A plate-type tension sensor with apertures and a spring structure that measures the tension in the seat belt by determining the width of a gap formed between moving apertures, allowing for accurate detection of occupant type and seat belt tension, which is used to inform the deployment of inflatable restraint systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a child seat is secured with the vehicle restraint system, then the seat belt tension becomes high, but the sensor may misinterpret this as an adult occupant
Solution Approach 1:
The plate is segmented into multiple functional regions: a first aperture for attachment, a second aperture that moves relative to the first, and cutouts forming a spring structure between them. This segmentation allows the sensor to distinguish between different tension sources by measuring the relative movement of apertures through the spring mechanism.
Solution Approach 2:
The spring structure creates a dynamic system where the second aperture moves relative to the first aperture based on applied tension. This dynamic movement allows the sensor to differentiate between static high tension (child seat) and dynamic tension patterns (adult occupant), resolving the false positive detection issue.
2Measurement precision
If a single plate type tension sensor is used, then the device complexity is reduced, but the measurement precision of seat belt tension may be insufficient
Solution Approach 1:
The sensor merges multiple measurement functions into a single plate structure. The plate combines attachment features (apertures), sensing elements (spring structure with cutouts), and measurement output (relative aperture movement) into one integrated component, achieving precise tension measurement without increasing overall device complexity.
Solution Approach 2:
The sensor utilizes changes in the physical parameter of aperture spacing caused by spring deformation under tension. By measuring the change in distance between the first and second apertures, the system accurately determines seat belt tension while maintaining a simple single-plate construction.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a robust and cost-effective means to accurately determine seat belt tension, enabling precise deployment of airbags and ensuring safer occupant protection by distinguishing between adult and child occupants, thereby reducing the risk of inappropriate airbag deployment.
Implementation Method 1
a spring structure and a gap formed from cutouts in the plate. The first aperture and the second aperture movable relative to each other as tension is applied to a seat belt
Data Source
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AI summary
A plate type tension sensor having apertures, a spring structure, and a gap are provided. The spring structure allows the apertures to move relative to each other as tension is applied to a seat belt to which the plate is attached. The movement changes the width of the gap. The tension applied to a vehicle restraint system may be determined based on the gap width.