Occupant Position Detection for Adaptive Airbag Deployment
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Solution Overview
Problem
Existing safety systems for vehicle occupants fail to accurately detect the position and dynamics of occupants before an accident, leading to inadequate airbag deployment and potential injuries, even at low speeds, especially when occupants are unbuckled or positioned close to the airbag module.
Innovation Solution
A novel method utilizing acceleration and weight sensors, combined with status monitors like Luenberger observers or Kalman filters, to accurately classify and locate occupants, allowing for situation-dependent adjustment of airbag inflation, avoiding unnecessary aggressive inflation or complete suppression during specific crash types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If airbag deployment is made aggressive to ensure protection, then occupant protection is improved, but injury risk increases when occupants are positioned close to the airbag or unbuckled
Solution Approach 1:
The system performs preliminary classification of occupants using IOS sensors (video cameras, OC mats, force measuring pins, strain gauges) to determine occupant position, weight, and posture before the accident occurs. This advance information allows the control unit to adjust airbag deployment parameters individually for each occupant, ensuring protection while avoiding injury from aggressive deployment when occupants are in unsafe positions.
Solution Approach 2:
The control unit dynamically adjusts airbag deployment parameters (inflation pressure, timing, duration) based on real-time classification data from multiple sensors. By changing these parameters according to occupant characteristics and position, the system achieves optimal protection without causing injury, resolving the contradiction between aggressive deployment and safety.
2Measurement precision
If additional sensors are added to accurately detect occupant position, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The system makes existing multi-functional sensors serve additional purposes. Acceleration sensors originally designed for crash detection are also used to determine occupant dynamics and position. Weight sensors in the seats are utilized for occupant classification. This multi-functionality improves measurement precision without adding significant device complexity or cost.
Solution Approach 2:
The system combines data from multiple existing sensor types (acceleration sensors, weight sensors, IOS sensors) to achieve accurate occupant position detection. By merging information from these sensors through status monitors and classification algorithms, the system achieves high measurement precision using components already present in modern vehicles, avoiding the need for entirely new sensor systems.
3Object-affected harmful factors
If airbag deployment is suppressed to avoid injury, then injury risk is reduced, but protection effectiveness decreases in actual crash scenarios
Solution Approach 1:
Rather than simply suppressing or deploying the airbag, the system dynamically adjusts deployment parameters based on occupant classification. For occupants in unsafe positions, the system modifies inflation pressure, timing, and duration to reduce injury risk while maintaining some protective effect. This nuanced parameter adjustment resolves the contradiction by avoiding both aggressive deployment and complete suppression.
Solution Approach 2:
The system applies partial deployment or modified deployment strategies for occupants in questionable positions. Instead of complete suppression, the airbag may deploy with reduced force or delayed timing, providing partial protection while minimizing injury risk. This partial action approach balances the contradiction between protection and injury prevention.
Data Source
AI summary
A safety system for vehicle occupants having a device for determining the position of the vehicle occupant. A status monitor to which the output signals of sensors are conveyed is provided for determining the position of the vehicle occupant, the sensors detecting the acceleration of the vehicle and the weight of the vehicle occupant. A method for controlling a safety system.