Vehicle Occupancy Detection Suspension Under Vibration
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Solution Overview
Problem
Radar presence detection systems in vehicles are prone to false detections due to vibrations caused by external factors, such as air flow, road irregularities, and passenger movement, which can lead to unnecessary warnings and annoyance.
Innovation Solution
A method and system that periodically determine vehicle occupancy using a presence sensor, quantify vehicle vibrations, and suspend occupancy detection when vibrations exceed predetermined thresholds to prevent false detections, with the system comprising a presence sensor, a vibration sensor, and a computer that controls both, allowing for restart when vibrations subside.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If radar presence detection is continuously performed, then occupancy monitoring functionality is maintained, but false detections increase due to vehicle vibrations
Solution Approach 1:
The system performs occupancy detection periodically rather than continuously, suspending detection when vibration levels exceed a threshold. This reduces false detections during high-vibration periods while maintaining adequate monitoring coverage when conditions are stable.
Solution Approach 2:
The system uses vibration sensor feedback to dynamically control the detection process. When vibration levels are high, the system automatically suspends occupancy detection to prevent false positives, and resumes when vibrations subside, creating a closed-loop control mechanism.
2Reliability
If occupancy detection is suspended during vibrations, then false detections are reduced, but warning response time increases
Solution Approach 1:
The system takes preliminary action by suspending detection before false detections can occur during high-vibration periods. By proactively stopping detection when vibration thresholds are exceeded, the system prevents erroneous warnings while maintaining readiness to detect genuine occupancy changes when vibrations subside.
3Measurement precision
If vibration threshold is set low, then detection sensitivity is high, but normal vibrations cause false suspensions
Solution Approach 1:
The system dynamically adjusts the detection parameters based on vibration levels. By changing the operational state (detecting vs. suspended) according to vibration threshold parameters, the system optimizes between sensitivity and false suspension rates, maintaining detection availability while preventing false detections.
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 reduces false detections and maintains system functionality with minimal delay in warnings, ensuring accurate occupancy determination and reducing annoying sound signals.
Implementation Method 1
Presence detection systems using radar are increasingly integrated into motor vehicles
Implementation Method 2
determining a value representative of a quantity of vibration of the vehicle
Data Source
AI summary
The present invention relates to a method for determining occupancy inside a motor vehicle using a presence sensor. The method includes periodically determining the occupancy and determining a value representative of a quantity of vibration of the vehicle. The method also includes suspending the periodic determination of the occupancy. The suspension is triggered on the basis of the value representative of the quantity of vibration.