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Plane capacitance sensor and method for detecting environmental change of motorcar glass

A capacitive sensor and windshield technology, which is applied in the fields of material capacitance, vehicle cleaning, vehicle maintenance, etc., can solve the problems of inability to measure the thickness of rainwater, poor adaptability, and small measurement area, so as to avoid misoperation of wipers and reduce Adverse effects, avoid the effect of slow reaction

Active Publication Date: 2007-12-12
AUTOEASY ELECTRONICS TECH
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0019] One of the technical problems to be solved by the present invention is to overcome the deficiencies of the above-mentioned prior art and provide a planar capacitive sensor capable of eliminating temperature drift and electromagnetic interference. The traditional detection device has the disadvantages of small measurement area, inability to measure the thickness of rainwater, easy to be interfered by pollutants, high installation requirements, poor adaptability and high cost, etc.

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  • Plane capacitance sensor and method for detecting environmental change of motorcar glass
  • Plane capacitance sensor and method for detecting environmental change of motorcar glass
  • Plane capacitance sensor and method for detecting environmental change of motorcar glass

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Embodiment Construction

[0075] Before describing the present invention in detail, briefly describe the prior art and the working principle of the present invention:

[0076] The traditional capacitive sensor is based on parallel plate capacitance. Its principle is: if the edge effect of the non-uniform electric field is not considered, the capacitance composed of two parallel plates has a capacitance of

[0077] C=ε·S / d

[0078] In the formula, ε is the dielectric constant of the medium between the plates, ε=ε0·εr, ε0 is the dielectric constant in vacuum, ε0=8.854·10 -12 F / m, εr is the dielectric constant of the medium relative to vacuum, the relative dielectric constant of air εr≈1, and other media εr>1; S is the area of ​​the plate; d is the distance between the plates.

[0079] Due to the change of the measured medium, the relevant parameters of the capacitive sensor ε, S, and d change, so that the capacitance C changes accordingly. Accordingly, the traditional capacitive sensor can be divided i...

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Abstract

A kind of flat capacitance-type sensor includes a flat capacitor, a flat capacitance compensator which eliminate interfere signal and a sensor detecting circuit. The invention adopts double-flat capacitance, thereinto one is used as measuring capacitance; another is as compensating capacitance, it is insensitive with rain water of outer surface by changing mounting position and shape of compensating capacitance, and sensitive with temperature shift and electromagnetic interfere. When there is temperature shift or electromagnetic interfere, the value of measuring capacitance and compensating capacitance change at the same time and extent are similar, when rain water is changed, value of measuring capacitance changes, but value of compensating capacitance does not change. Using characters above can difference compensate measuring of sensor, disadvantageous affects of temperature shift and electromagnetic interfere can be decreased, error action of rain shaving can be avoided.

Description

Technical field: [0001] The invention relates to a device for detecting environmental changes of the windshield of an automobile, in particular to a detection device for detecting changes in the amount of rain on the windshield of an automobile and a detection method using the detection device. 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 detection system not only focuses on humanized care for driving convenience, but more importantly, the automatic detection system is an important part of the vehicle's active safety system. In rainy days or in environments with high relative air humidity, the windshield surface of a car often affects the driver's sight due to excessive rain. [0003] The key technology ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K17/94H03K17/00
CPCB60S1/0881B60S1/0822G01N27/22B60S1/0877B60S1/0874B60S1/0825
Inventor 孙滕谌
Owner AUTOEASY ELECTRONICS TECH
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