Occupancy Sensor Testing via Environmental-Adjusted Force Thresholds
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Solution Overview
Problem
Seat occupancy detection sensors in vehicles are triggered inaccurately due to varying environmental conditions like temperature and humidity, leading to inconsistent performance across different weight ranges.
Innovation Solution
A system comprising a processor, environmental sensor, force applicator, and occupant detection sensor that applies increasing forces to a vehicle seat, records force values, and compares them with threshold values adjusted for environmental conditions to determine accurate occupancy detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If seat occupancy detection sensors are used to detect when a person is in a vehicle seat, then occupancy detection function is provided, but the sensors are triggered inaccurately due to varying environmental conditions like temperature and humidity
Solution Approach 1:
The patent applies parameter changes by adjusting the force threshold values based on environmental conditions (temperature, humidity) and seat material properties. The system dynamically modifies the threshold parameters to account for environmental variations, allowing the sensor to maintain accurate occupancy detection across different conditions without being overly sensitive to environmental changes.
2Measurement precision
If increasing forces are applied to the seat portion to test occupancy detection, then the detection range is improved, but the testing process becomes more complex
Solution Approach 1:
The testing device integrates multiple functions into a single system: the force applicator applies controlled forces, the environmental sensor monitors conditions, the processor coordinates the testing sequence, and the system automatically compares results against thresholds. This multi-functional integration achieves comprehensive force measurement range while managing system complexity through coordinated operation of components.
3Measurement precision
If environmental sensors and force applicators are added to the testing system, then the accuracy of occupancy detection testing is improved, but the device complexity increases
Solution Approach 1:
The system employs feedback mechanisms where environmental sensors continuously monitor temperature and humidity, and this information feeds back to the processor which adjusts the force threshold values accordingly. The force applicator applies forces and receives feedback from the occupant detection sensor, creating a closed-loop testing system that improves accuracy while managing complexity through automated control.
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
This system ensures reliable occupancy detection by outputting a pass or fail signal based on force values within defined thresholds, accounting for environmental and material variations, thus enhancing the accuracy and consistency of seat occupancy sensing.
Implementation Method 1
The force applicator is configured to apply increasing forces to a seat portion of a vehicle seat, magnitude of sequential ones of the forces increasing over time
Implementation Method 2
The environmental sensor is configured to generate an environmental value
Implementation Method 3
receive a seat occupied signal from an occupant detection sensor of the vehicle seat being tested
Data Source
AI summary
Various disclosed embodiments include illustrative devices, systems, and methods for analyzing occupancy detection sensors. In an illustrative embodiment, a device includes a processor and a memory configured to store computer-executable instructions. The instructions are configured to cause the processor to receive an environmental value, send instructions to apply increasing forces to a seat portion of a seat, magnitude of sequential ones of the forces increasing over time, receive applied force values from a force applicator, receive a seat occupied signal from a seat sensor, record the applied force value associated with the applied force values in response to receiving the seat occupied signal, compare the recorded force value with a threshold force value associated with the received environmental value, and output a signal in response to the comparison.