Child Seat Detection via Hall Sensor to Disable Pretensioners
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Solution Overview
Problem
Existing vehicle safety systems, such as pretensioners and airbags, can pose a risk to children due to excessive load upon deployment, necessitating a mechanism to deactivate these systems when a child seat is present.
Innovation Solution
A child seat detection system using a magnet and Hall effect sensor, along with a controller, to prevent the activation of pretensioners and airbag inflation when a child seat is detected, ensuring the safety belt retractor operates in an always locked mode to prevent webbing payout.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pretensioners and airbags are activated for passenger safety, then adult occupant protection is improved, but child occupant safety deteriorates due to excessive load
Solution Approach 1:
The system performs preliminary detection of child seat presence using a Hall effect sensor before the collision event occurs. The magnet mounted on the child seat is detected in advance, allowing the controller to pre-disable the pretensioner and airbag systems, preventing harmful deployment forces from being applied to the child.
Solution Approach 2:
A magnetic detection system serves as an intermediary between the physical presence of the child seat and the safety system control. The magnet and Hall effect sensor create a magnetic field-based signaling mechanism that communicates child seat presence to the controller, which then mediates the disablement of potentially harmful safety systems.
2Object-affected harmful factors
If a detection system is added to identify child seats, then child safety is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical detection systems with a magnetic field-based detection system. Instead of using mechanical switches, weight sensors, or optical systems, the invention uses a simple magnet mounted on the child seat and a Hall effect sensor in the vehicle, leveraging magnetic field detection to identify child seat presence with minimal mechanical complexity.
Solution Approach 2:
The system detects child seat presence by monitoring changes in magnetic field parameters. The Hall effect sensor measures the strength and presence of the magnetic field generated by the magnet on the child seat, using parameter changes in the magnetic environment to trigger the safety system disablement without requiring complex structural modifications.
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
Effectively prevents excessive load on a child's chest by deactivating pretensioners and airbags when a child seat is installed, ensuring compliance with safety regulations and minimizing injury risk.
Implementation Method 1
A child seat detecting means employing a magnet and Hall effect sensor for detecting whether a child seat is mounted on the passenger seat
Data Source
AI summary
A child seat (56) detecting means employing a magnet and sensor (141) for detecting whether a child seat (56) is mounted on the passenger seat (14, 15). A controller (40) in response to a signal from the sensor (141) will prevent activation of a pretensioner or belt tightener (65) from tensioning the seat belt or webbing (55) which is often positioned about or through the child seat (56) and/or for preventing an inflator (34) from expanding an airbag (26) when a child seat (56) is detected on either the front or rear passenger seat (14, 15).