Cabin Occupant Detection Range Control for Rear-Seat Sensing
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Solution Overview
Problem
Existing cabin detection systems using radio wave sensors installed in the front seat face challenges in accurately detecting rear-seat occupants due to vibrations, seat back pockets, and erroneous detection of front-seat occupants based on their seated state, leading to potential misidentification.
Innovation Solution
A cabin-inside detection device that employs a combination of sensors, including cameras and radars, to acquire data on both front-seat and rear-seat occupants, with a processing circuitry that estimates the front-seat occupant's position and determines the detection range of the radar to accurately detect rear-seat occupants, considering the seated state of the front-seat occupant.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a radio wave sensor is installed in the front seat, then the rear-seat occupant can be detected, but detection accuracy deteriorates due to vibration, seat back pockets, and front-seat occupant interference
Solution Approach 1:
The patent moves the radio wave sensor from the front seat to the rear seat, changing the spatial dimension of installation. This positional shift in another dimension eliminates interference from front seat components while maintaining detection capability for rear seat occupants.
Solution Approach 2:
The patent extracts the radio wave sensor from the front seat environment and relocates it to the rear seat, removing it from the harmful environment caused by vibration and seat back pockets that interfere with detection accuracy.
2Area of stationary object
If a radio wave sensor is installed above the seat, then detection range is improved, but false detection occurs due to front-seat occupant interference
Solution Approach 1:
The patent changes the installation position from above the front seat to the rear seat area, utilizing a different spatial dimension. This repositioning allows the sensor to detect rear seat occupants without being blocked or interfered with by front seat occupants, thereby improving both detection range and accuracy.
Solution Approach 2:
The patent applies local quality by positioning the sensor specifically in the rear seat area where it can optimally detect rear seat occupants without interference from front seat elements, creating a localized detection zone with high precision.
3Area of stationary object
If the detection range is expanded to cover the rear seat, then rear-seat occupant detection is enabled, but front-seat occupants are erroneously detected as rear-seat occupants
Solution Approach 1:
The patent utilizes dimensional change by relocating the sensor to the rear seat area, which allows the detection range to cover the rear seat effectively while preventing false detection of front seat occupants through the spatial separation created by this positional transformation.
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
The system effectively detects rear-seat occupants while minimizing false positives from front-seat occupants, enhancing accuracy and reliability in occupant detection within the vehicle cabin.
Implementation Method 1
a radio wave sensor installed in a cabin and transmitting a radio wave from a position where the sensor is disposed, to the rear seat
Data Source
AI summary
A first data acquiring unit to acquire first data acquired by a first sensor, a second data acquiring unit to acquire second data acquired by a second sensor installed above a seat in a cabin, a front-seat occupant position estimating unit to estimate a position of an occupant on a basis of the first data acquired by the first data acquiring unit, a detection range determining unit to determine a detection range of the second sensor on a basis of the position of the front-seat occupant estimated by the front-seat occupant position estimating unit, and a rear-seat occupant detecting unit to detect a rear-seat occupant on a basis of the second data acquired by the second data acquiring unit and the detection range of the second sensor determined by the detection range determining unit are provided.