Steering Wheel Capacitive Track Pattern for Hand Grip Recognition
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Solution Overview
Problem
Current systems for detecting a driver's hand position and grip on a steering wheel are inadequate in determining the accurate position and manner of grip, failing to provide reliable information on correct grip engagement.
Innovation Solution
A device with an electrically insulating support and conductive tracks featuring alternating peaks and troughs is used, allowing for capacitive sensing to determine hand position and grip manner by processing variations in electrical quantities, with multiple tracks for enhanced detection and interference shielding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a simple contact detection system is used, then the device complexity is reduced, but the measurement precision of hand position and grip manner is insufficient
Solution Approach 1:
The conductive track is segmented into multiple discrete peaks and troughs arranged in a specific pattern. Each peak-trough pair acts as an independent sensing element that detects capacitive changes when contacted by the hand. This segmentation allows the system to determine both position (which peaks are contacted) and grip manner (pattern of contacted peaks), achieving high measurement precision without requiring a monolithic complex sensor structure.
Solution Approach 2:
Different regions of the steering wheel surface are assigned different sensing characteristics through the strategic placement of peaks and troughs. The density, size, and arrangement of peaks vary across different zones to optimize detection for specific grip locations and manners. This local differentiation enables precise identification of hand position and grip type while keeping the overall device structure relatively simple.
2Measurement precision
If multiple conductive tracks are used to enhance detection accuracy, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
Multiple sensing functions are merged into a single integrated conductive track structure that contains both peaks and troughs in alternating arrangement. This unified structure simultaneously detects both hand position and grip manner through capacitive coupling, eliminating the need for separate sensor arrays and reducing overall device complexity while maintaining high measurement precision.
Solution Approach 2:
The conductive track with peaks and troughs serves multiple functions: it detects hand contact position, determines grip manner (correct vs. incorrect), and provides information about contact force. This multi-functional design achieves high detection accuracy without requiring multiple separate tracking systems, thereby controlling device complexity.
3Measurement precision
If the surface area of the conductive track is increased to improve contact detection, then the measurement precision is improved, but the area available for other steering wheel functions is reduced
Solution Approach 1:
The conductive track utilizes the natural curvature of the steering wheel surface by arranging peaks and troughs in a pattern that follows the wheel's contour. This curved arrangement maximizes the effective sensing area within the available space, improving contact detection accuracy without encroaching on the functional surface area needed for steering operations.
Solution Approach 2:
Instead of expanding the sensing area in a single plane, the invention uses the third dimension by creating raised peaks and depressed troughs. This vertical dimensionality allows the sensor to maintain high detection precision while occupying minimal lateral space on the steering wheel surface, preserving area for other functions.
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 device accurately determines hand position and grip on the steering wheel, distinguishing between correct and incorrect grip engagement, and can detect both hands, providing reliable feedback for improved driving safety.
Implementation Method 1
The first track advantageously is adapted to operate as contact sensor, in particular when a user's hand or hands touch or are close to the steering wheel... The particular distribution of the first track advantageously allows an electronic control unit to process an electrical quantity, for example a capacitance, associated with the conductive track.
Data Source
AI summary
A device (100, 200′, 200″, 300, 400) for detecting the contact between a user and a steering wheel (9) of a vehicle, the device (100, 200′, 200″, 300, 400) comprising: an electrically insulating support (10); a first electrically conductive track (101, 201, 301, 401) fastened to the support (10) and comprising a plurality of first peaks (11) alternated with a plurality of first troughs (12) along a direction (D), wherein the first track (101, 201, 301, 401) is distributed over the support so that the surface of the first track (101, 201, 301, 401) adapted to come into contact with a user's hand decreases along said direction (D).