Vehicle Seat Occupant Identification Under Dynamic Driving
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Solution Overview
Problem
Existing methods for identifying a child car seat or an adult on a vehicle seat are prone to false positives and negatives during dynamic driving conditions due to the influence of strong acceleration and deceleration maneuvers, which affect pressure and acceleration variances, leading to unreliable airbag activation decisions.
Innovation Solution
A method that incorporates speed variance analysis to determine whether to perform identification, using a relative variance ratio of pressure and acceleration, with threshold-based filtering and resetting to improve accuracy, and incorporates additional sensors like steering angle and vehicle control signals to stabilize the identification process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If dynamic method using pressure variance and acceleration variance is used to identify child car seat, then identification accuracy is improved, but false positives increase during strong acceleration and deceleration maneuvers
Solution Approach 1:
The patent introduces speed variance as a new parameter to monitor and detect unstable driving conditions. By calculating the variance of speed values over time and comparing against a threshold, the system can identify when the vehicle is undergoing strong acceleration or deceleration maneuvers. This parameter change enables the system to distinguish between legitimate identification signals and false positives caused by dynamic driving conditions.
Solution Approach 2:
The patent implements a dynamic evaluation system that adapts the identification process based on current driving conditions. When speed variance exceeds the threshold, the system automatically suspends identification operations. This dynamic approach allows the system to maintain high identification accuracy during stable driving while avoiding false positives during unstable driving conditions, effectively resolving the contradiction between measurement precision and reliability.
2Productivity
If identification is continuously performed during vehicle movement, then real-time safety monitoring is improved, but false identifications increase due to dynamic driving conditions
Solution Approach 1:
The patent implements a conditional periodic action system where identification operations are performed only when driving conditions are stable. By continuously monitoring speed variance and comparing against a threshold, the system determines appropriate moments to conduct identification. This periodic approach maintains real-time safety monitoring capability during stable driving while avoiding false identifications during unstable conditions, effectively balancing productivity and reliability.
3Adaptability or versatility
If pressure sensor and acceleration sensor data are used for identification, then identification capability is improved, but susceptibility to false positives during dynamic driving increases
Solution Approach 1:
The patent introduces speed variance analysis as an intermediary mechanism that mediates between the pressure/acceleration sensor data and the final identification decision. The speed variance threshold acts as a gatekeeper that determines when identification operations should proceed. This intermediary approach preserves the versatility of using multiple sensor types while protecting against false positives by filtering out identification attempts during unstable driving conditions.
Data Source
AI summary
A method for operating an identification device of a seat of a motor vehicle, in which an identification of a child car seat or an adult on the seat is carried out by an electronic computing device, and in which, depending on the identification, an airbag apparatus of the seat is activated, and in which a relative variance is determined from a ratio of a pressure variance of a pressure on the seat and an acceleration variance of an acceleration of the motor vehicle during a movement of the motor vehicle and, depending on the relative variance, the identification is carried out and the airbag apparatus is activated. The method further includes determining a speed variance of a speed of the motor vehicle by the electronic computing device and, depending on the determined speed variance, deciding whether the identification is carried out during the movement of the motor vehicle.