Radar Occupancy Detection in Seatbelt Buckles
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Solution Overview
Problem
Traditional pressure sensors in automobiles are ineffective in distinguishing between human occupants and inanimate objects, and cannot accurately determine the age of occupants, while being costly and complex to implement.
Innovation Solution
A radar-based occupancy detection system integrated into seatbelt buckles, using a radar module with an antenna to broadcast RF signals, processing time of flight, frequency change, and amplitude ratio to characterize seat occupancy and communicate this information to vehicle systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pressure sensors are implemented in automobile seats, then occupancy detection capability is provided, but the system cannot distinguish between human occupants and inanimate objects and cannot determine occupant age
Solution Approach 1:
The patent replaces traditional mechanical pressure sensors with a radar-based detection system that uses electromagnetic waves. The radar module transmits signals and analyzes reflected signals to detect occupancy characteristics, substituting mechanical contact-based detection with non-contact electromagnetic field-based detection, thereby enabling more precise characterization of occupants without physical contact.
Solution Approach 2:
The patent utilizes multiple radar signal parameters including time of flight, frequency change (Doppler shift), and amplitude ratio to characterize occupants. By analyzing changes in these physical parameters of the reflected radar signals, the system can distinguish between different types of occupants (adults, children, infants, inanimate objects) based on their unique electromagnetic reflection patterns.
2Reliability
If pressure sensors are used for occupancy detection, then basic occupancy status can be determined, but the system becomes costly and complex to implement
Solution Approach 1:
The radar module integrated into the seatbelt buckle serves multiple functions: it detects occupancy status, characterizes occupant type (adult, child, infant, inanimate object), and provides this information to multiple vehicle systems (airbag control, climate control, seatbelt reminders). This multi-functional approach eliminates the need for separate specialized sensors for each detection task, reducing overall system complexity while maintaining high reliability.
Solution Approach 2:
The patent introduces a signal processing unit that acts as an intermediary between the radar module and various vehicle control systems. This intermediary processes the raw radar signals, extracts relevant occupancy information, and communicates it to appropriate systems, thereby simplifying the integration complexity and reducing the burden on individual sensor components.
3Adaptability or versatility
If pressure sensors are implemented, then occupancy detection is achieved, but the system cannot provide detailed occupant characterization for precise vehicle system control
Solution Approach 1:
The radar-based system provides continuous feedback about occupant characteristics to vehicle control systems. By continuously monitoring radar signal parameters and updating occupancy information in real-time, the system enables dynamic adaptation of vehicle systems (such as adjusting airbag deployment strategies, climate control settings, and seatbelt reminders) based on the most current and precise occupant characterization available.
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 solution provides accurate characterization of seat occupants, reducing implementation costs and complexity, enabling more precise control of vehicle systems such as airbag deployment and climate control, and facilitating widespread occupancy detection across all vehicle seats.
Implementation Method 1
a radar module disposed within the seatbelt buckle, the radar module including an antenna configured to broadcast a radio frequency (RF) signal toward the seat
Implementation Method 2
the processor is configured to derive signal information from output received from the receiver, the signal information including at least one of time of flight, frequency change, and amplitude ratio
Implementation Method 3
the signal information including at least one of time of flight, frequency change, and amplitude ratio
Data Source
AI summary
A radar-based occupancy detection system that includes a seatbelt buckle disposed adjacent a seat of a vehicle and a radar module disposed within the seatbelt buckle, the radar module including an antenna, a radio frequency (RF) transmitter, a RF receiver, and a processor, the antenna configured to broadcast a RF signal generated by the RF transmitter toward the seat, the processor configured to derive signal information from output received from the receiver and to characterize occupancy of the seat based on the signal information.