Vehicle Seat Capacitive Sensing for Multi-Range Occupant Tracking

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Solution Overview

Problem

Existing vehicle seat sensors lack the capability to accurately determine the position, movement, and biometric data of occupants with low latency and high precision, especially when integrated into vehicle components like seats, and do not effectively utilize capacitive sensing and orthogonal signaling techniques.

Innovation Solution

Implementing capacitive-based sensors with frequency-division multiplexing and code-division multiplexing techniques, using orthogonal signaling and signal infusion to transmit signals through vehicle occupants, allowing for low-latency detection and creation of heat maps to track movement and position within vehicles.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If capacitive sensors with multiplexing techniques are implemented in vehicle seats, then measurement precision and detection speed improve, but device complexity increases

Engineering Contradiction:

Improveoccupant position detection precisionVSAvoidsensor system complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The sensor system is divided into multiple independent sensing zones within the seat, each capable of detecting occupancy and biometric data separately. This segmentation allows precise localization of occupants while using simpler individual sensor elements that can be multiplexed together.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The capacitive sensor array serves multiple functions simultaneously: detecting occupant presence, determining position, measuring biometric data (respiratory rate, heart rate), and identifying occupancy type (adult, child, empty). This multi-functionality reduces the need for separate specialized sensors for each measurement type.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Speed

If signal infusion technique is used to transmit signals through occupants, then detection speed improves, but energy consumption increases

Engineering Contradiction:

Improvedetection latencyVSAvoidsignal transmission energy

Core Design Contradiction:

SpeedVSUse of energy by moving object

Solution Approach 1:

The signal infusion technique uses periodic signal transmission at optimized intervals rather than continuous transmission. The system transmits signals at frequencies that resonate with human tissue properties, enabling rapid detection while minimizing total energy consumption through pulsed rather than continuous operation.

Inventive Principle:

Principle #19Periodic action

3Reliability

If multiple sensors are integrated into the seat to detect position and biometric data, then reliability improves, but ease of manufacture deteriorates

Engineering Contradiction:

Improvedetection reliabilityVSAvoidseat integration difficulty

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

Multiple sensor functions (occupancy detection, position sensing, biometric monitoring) are merged into a single integrated capacitive sensor array embedded within the seat structure. This consolidation improves reliability through cross-validation of multiple measurement types while simplifying manufacturing compared to installing separate independent sensor systems.

Inventive Principle:

Principle #5Merging (Combining)

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

Enables precise, low-latency detection of occupant position and movement, facilitating vehicle adjustments and safety features based on real-time biometric data, such as seat adjustments and safety warnings.

Implementation Method 1

Existing sensors integrated into vehicle components, such as seats, are unable to accurately determine position, movement, and biometric data of an occupant of the vehicle

Methodology Applied

Scientific EffectCapacitive sensing: Capacitance

Implementation Method 2

a first set of transmitting antennas are adapted to transmit frequency-orthogonal signals infused into a passenger of the vehicle

Methodology Applied

Scientific EffectFrequency-division multiplexing:

Implementation Method 3

Implementing capacitive-based sensors with frequency-division multiplexing and code-division multiplexing techniques

Methodology Applied

Scientific EffectCode-division multiplexing:

Implementation Method 4

using orthogonal signaling and signal infusion to transmit signals through vehicle occupants, allowing for low-latency detection and creation of heat maps to track movement and position within vehicles

Methodology Applied

Scientific EffectSignal infusion:

Data Source

PatentUS12515563B2Car seat sensing at multiple distances

Publication Date: 2026.01.06 TACTUAL LABS CO

AI summary

A sensor system is sensitive to the determination of activity, movement and position of a passenger in a vehicle. In particular, the determination of the position and movement of passengers in a vehicle can be enhanced by providing groupings of transmitting antennas and/or multiple infusion antennas. The sensing system is able to determine the movement and activity of the passengers at various ranges and locations within the vehicle.