Plane capacity type automatic wiper system intelligent sensor for automobile glass

An automatic wiper and sensor technology, used in material capacitance, vehicle maintenance, scientific instruments, etc., can solve the problems of inability to measure the thickness of rainwater, small measurement area, pollutant interference, etc., so as to be less susceptible to pollutant interference, and the installation process is simple. , to avoid reflecting sluggish effects

Inactive Publication Date: 2004-04-28
AUTOEASY ELECTRONICS TECH
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Problems solved by technology

[0012] The purpose of the present invention is to provide a planar capacitive intelligent raindrop sensor, which can overcome the small measurement area, inability to measure the thickness of rainwater, easy to be interfered by pollutants, high installation requirements and poor adaptability of existing photoelectric automatic wiper system raindrop sensors. and high cost

Method used

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  • Plane capacity type automatic wiper system intelligent sensor for automobile glass
  • Plane capacity type automatic wiper system intelligent sensor for automobile glass
  • Plane capacity type automatic wiper system intelligent sensor for automobile glass

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Embodiment Construction

[0039] The present invention adopts the principle of measuring capacitance. Traditional capacitive sensors are based on parallel plate capacitors. Its principle is: if the capacitor composed of two parallel plates does not consider the edge effect of the non-uniform electric field, its capacitance is

[0040] C = ϵ · S / d

[0041] In the formula, ε is the dielectric constant of the medium between the plates, ϵ = ϵ 0 · ϵr , ϵ 0 is the dielectric constant in vacuum, ϵ 0 = 8.854 · 10 - 12 F / m , ϵr is the dielectric constant of the medium relative to vacuum, and the relative dielectric constant of air ϵr ...

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Abstract

The sensor is a pair of planar electrodes in some interval formed on the inner surface of automobile glass via adhering, pressing, painting or plating conductor, and electrode pair constitutes one planar capacitor via glass and near dielectric space. When some rain drops or other foreign matter attach to the outer surface of the glass, there will be changes in the average dielectric constant, the area covered by the planar capacitor plates and the minor axis radius of the dielectric space and thus change in capacitance, and the intelligent adaptive signal amplifying and processing unit with microprocessor detects the change in capacitance and converts it into digital signal to drive the control unit of the automatic windscreen wiper system.

Description

technical field [0001] The invention relates to the technical fields of automotive electronics, intelligent sensors and measurement. It provides a planar capacitive smart raindrop sensor for automotive glass automatic wiper system. Background technique [0002] Since entering the 21st century, automobile electronics and intelligence have become the direction and frontier of the development of automobile industry technology, and the safety and humanization of automobiles have also become the focus of major automobile manufacturers. The automatic wiper system is not only a humanized concern for the convenience of the driver, but more importantly, the automatic wiper system is an important part of the active safety system of the car. Automatic wiper system (including: front windshield, rear window, headlights, side mirrors, etc.) has been adopted by more and more mid-to-high-end cars, and it is believed that automatic wiper system will become the standard configuration of auto...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60S1/04B60S1/08G01N27/22G01W1/14
Inventor 孙滕谌于杰
Owner AUTOEASY ELECTRONICS TECH
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