Dynamic Vibration Threshold for Vehicle Seat Occupancy Detection
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Solution Overview
Problem
Existing vehicle passenger detection systems face challenges in accurately determining seat occupancy due to vehicle vibrations, leading to deferred seating determinations, which can result in reduced precision and missed opportunities for accurate assessments.
Innovation Solution
A vehicle passenger detection apparatus with a load detecting part and a seat condition determining part, including a vibration threshold value setting section, a vibration determining section, and a seat determining section, where the vibration threshold value is set higher when the load detection signal fluctuation is small and lower when it is large, allowing for more accurate determination of vehicle vibrations and seat occupancy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a seating determination is deferred when vehicle vibrations are large, then the reliability of seating determination is improved, but the productivity of the detection system deteriorates due to missed determination opportunities
Solution Approach 1:
The vibration threshold value is made dynamically adjustable based on the fluctuation amount of the load detection signal. When fluctuation is small, the threshold is set high to allow determinations during vehicle movement. When fluctuation is large, the threshold is lowered to prevent false determinations. This dynamic adjustment resolves the contradiction by adapting the system's sensitivity to current vibration conditions.
Solution Approach 2:
The system changes the parameter of vibration threshold value based on the fluctuation amount of load detection signals. By monitoring signal stability and adjusting the threshold accordingly, the system can execute seating determinations during low-fluctuation periods even when vehicle vibrations are present, while maintaining reliability during high-fluctuation periods.
2Device complexity
If a fixed vibration threshold is used to determine vehicle vibrations, then the device complexity is reduced, but the measurement precision of vibration detection deteriorates
Solution Approach 1:
The system uses the load detection signal itself to determine the appropriate vibration threshold value. By calculating the fluctuation amount from the load detection signal and using this to set the threshold, the system performs self-adjustment without requiring external input or complex pre-programming, thus maintaining simplicity while improving precision.
Data Source
AI summary
A vehicle passenger detection apparatus includes a load detecting part and a seat condition determining part. The seat condition determining part includes a vibration threshold value setting section, a vibration determining section and a seat determining section. The vibration threshold value setting section sets a vibration threshold value based on the load detection signal such that the vibration threshold value is higher when a fluctuation amount of the load detection signal is small than when the fluctuation amount of the load detection signal is large. The seat determining section executes a seating determination based on the load detection signal when the vibration determining section determines that the vehicle vibration is not occurring based on the load detection signal and the vibration threshold value, and to defer execution of the seating determination to maintain a previous seating determination result when the vibration determining section determines that the vehicle vibration is occurring.