Steering Wheel Capacitive Sensor Layout With Three-Zone Grip Detection
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Solution Overview
Problem
Existing vehicle steering wheel detection systems for human presence are complex and costly, with prior solutions using multiple sensors that are difficult to arrange and wire, leading to increased production costs and uncertainties in determining hand contact with the steering wheel.
Innovation Solution
A detection device for a vehicle steering wheel using only three capacitive sensors, strategically positioned on the left and right halves of the rear face and the front face, with specific sensitivity areas to reliably detect hand contact and proximity, reducing the number of sensors and connections while improving grip detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple sensors are arranged along the circumference and radial section of the steering wheel to detect hand contact, then the detection coverage is improved, but the device complexity and manufacturing cost increase significantly
Solution Approach 1:
The steering wheel detection system is segmented into three distinct sensor zones: a first sensor on the left-hand part, a second sensor on the right-hand part, and a third sensor on the lower part. This segmentation allows each sensor to cover specific critical areas where hand contact is most likely to occur, reducing the total number of sensors needed while maintaining reliable detection capability.
Solution Approach 2:
Each sensor is assigned a specific functional role based on its location: the first and second sensors detect hand contact on their respective sides, while the third sensor specifically monitors the lower region. This local quality assignment ensures that sensors are positioned and configured to detect the most relevant contact patterns in each zone, improving overall system reliability with fewer components.
2Measurement precision
If sensors cover the entire radial section of the steering wheel to ensure comprehensive detection, then the detection precision is improved, but the quantity of sensors and wiring requirements increase
Solution Approach 1:
The invention extracts and focuses detection capability on the three most critical zones of the steering wheel where hand contact is most likely to occur. By removing sensors from less critical areas and concentrating resources on these key zones, the system achieves high detection precision with a reduced sensor count, thereby reducing wiring complexity and manufacturing costs.
Solution Approach 2:
Instead of providing uniform sensor coverage across the entire steering wheel, the system applies partial action by concentrating sensors only in the three critical zones (left, right, and lower parts). This partial coverage strategy is sufficient to detect all relevant hand contact scenarios while minimizing the total number of sensors required.
3Reliability
If the lower part of the steering wheel is made inactive to prevent false detection from leg contact, then the reliability of hand contact detection is improved, but the detection coverage is reduced
Solution Approach 1:
The third sensor positioned on the lower part of the steering wheel provides localized detection capability in the previously inactive zone. This allows the system to distinguish between legitimate hand contact (detected by the third sensor) and false contacts from leg or knee contact (which would not trigger the sensor in the same way), thereby maintaining reliability while expanding the active detection area.
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 solution simplifies the arrangement and reduces manufacturing costs while enhancing the reliability of detecting proper grip on the steering wheel, effectively addressing the limitations of existing systems by focusing sensors on critical hand contact areas.
Implementation Method 1
the sensors being capacitive sensors which determine a capacitance signal in response to proximity or contact of a person with the steering wheel
Data Source
AI summary
Detection device for a steering wheel of a vehicle, said device being configured to detect contact or proximity of a person with or to the steering wheel, comprising sensors, of which there are only three, of which:a first sensor (21) is intended to be arranged on a left-hand half of a first face of the steering wheel,a second sensor (22) is intended to be arranged on a right-hand half of said first face of the steering wheel, anda third sensor (23) is intended to be arranged on a second face opposed to said first face of the steering wheel, and said first face is a rear face of the steering wheel.