Vehicle Window Capacitive Sensor Moisture Shielding
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Solution Overview
Problem
Conventional vehicle keypads and climate control systems require separate sensors for moisture detection, which can be cumbersome and inefficient, and existing proximity switches are not effectively designed to handle moisture interference on vehicle windows.
Innovation Solution
A vehicle window with integrated capacitive sensors and a conductive shield that senses moisture on the interior surface, allowing for simultaneous proximity switching and moisture detection, with the capacitive sensor operating as a switch to control door locks and activate a defogger based on user input and moisture levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a separate humidity sensor is used to detect moisture in the vehicle, then moisture detection accuracy is improved, but device complexity increases
Solution Approach 1:
The patent combines the proximity switch and humidity sensor into a single integrated device. The capacitive sensor serves dual purposes: detecting user proximity for keypad operations and measuring humidity levels for climate control, thereby reducing device complexity while maintaining detection accuracy
Solution Approach 2:
The capacitive sensor is designed to perform multiple functions simultaneously - it acts as both a proximity switch for user input detection and a humidity sensor for moisture measurement. This multi-functionality eliminates the need for separate sensors and reduces overall system complexity
2Ease of operation
If a capacitive sensor is used for proximity switching, then ease of operation is improved, but sensitivity to moisture interference worsens
Solution Approach 1:
The sensor is divided into distinct functional zones with different sensitivity characteristics. One region is optimized for proximity detection while another region detects humidity, allowing the system to differentiate between user input and moisture interference through spatial segmentation of sensing functions
Solution Approach 2:
Different regions of the capacitive sensor have different sensitivity properties. The sensor structure creates localized zones where one area responds primarily to proximity changes while another area responds to humidity, enabling the system to distinguish between operational inputs and environmental moisture
3Measurement precision
If multiple separate sensors are used for different functions, then measurement precision is improved, but manufacturing cost increases
Solution Approach 1:
The patent merges multiple sensor functions into a single capacitive sensor device, reducing the number of components that need to be manufactured and assembled. This integration lowers manufacturing costs while maintaining the precision of both proximity and humidity measurements through sophisticated signal processing
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 an economical and reliable method for enhanced user input through proximity switches while reducing the need for separate moisture sensors, effectively managing moisture on vehicle windows by integrating sensing and control functions within the window assembly.
Implementation Method 1
a capacitive sensor disposed on the transparent medium for sensing moisture on the first surface
Implementation Method 2
a conductive shield provided between the capacitive sensor and the second surface of the transparent medium, the conductive shield reducing sensitivity of the sensor to moisture on the second surface
Data Source
AI summary
A proximity switch and moisture sensing assembly includes a vehicle window and a proximity switch including a proximity sensor located on the window and providing an activation field. The proximity switch and moisture sensing assembly also includes control circuitry monitoring a signal responsive to the activation field, determining a switch activation based on the signal, and determining a moisture value based upon the signal. A conductive shield may be disposed between the proximity sensors and the outside environment to reduce the effects of moisture on the outer side of the window.