感應雨刷參數配置 更新時間: 2019-09-12

浦和红钻vs名古屋 www.nthjoa.com.cn 簡介

感應式雨刷器能通過雨量傳感器感應雨滴的大小,自動調節雨刷運行速度,為駕駛者提供良好的視野,從而大大提高雨天駕駛的方便性和安全性。


『雨量傳感器』

工作原理

目前應用較廣的兩種主流傳感器分別是光學式傳感器和電容式傳感器。光學式傳感器是根據光的折射原理工作的。在光學式傳感器中有一個發光二極管,它發出一束錐形光線,這束光穿過前擋風玻璃。當擋風玻璃上沒有雨水、處于干燥狀態的時候,幾乎所有的光都會反射到一個光學傳感器上,當下雨的時候,擋風玻璃上會存有雨水,一部分光線就會偏離,這就造成了傳感器接收到光的總量的變化,從而檢測到了雨水的存在。光學式傳感器能夠接收反射光的面積越大,得到的信息就越詳盡。光學式傳感器十分精確,甚至有可能準確地判斷出落在被感應區域上的雨點數目。

另一種是電容式傳感器,它主要是利用水和玻璃的介電常數的巨大差異設計的,其中水的介電常數為80,玻璃的介電常數為2。通常的做法是,把兩條呈平行狀態的指狀金屬極板放入擋風玻璃的內、外層之間,一組指狀金屬極板相交錯,但是并不觸及其他的指狀金屬極板。當擋風玻璃處于干燥狀態的時候,擋風玻璃外表面和每組指狀金屬極板之間就形成了電介質。當擋風玻璃變濕的時候,根據與擋風玻璃接觸的水量的不同,擋風玻璃的介電常數發生不同的變化。如果把傳感器安裝在擋風玻璃的表面上或者緊貼在擋風玻璃的下表面,這對傳感器的工作是有利的,因為這樣的安裝能使傳感器發揮其最佳靈敏度。不利的是,把電容式傳感器安裝在擋風玻璃的外表面上會產生與阻力傳感器同樣的問題,其金屬鍍層在雨刷的長期工作下會很快被從擋風玻璃上刮掉。

is another kind of capacitive sensor, which is mainly designed by the huge difference of the dielectric constant of water and glass. The dielectric constant of water is 80, and the dielectric constant of glass is about 2. The usual practice is to put the two parallel state of the finger metal plate into the windshield of the inner and outer layers, a group of finger shaped metal plate intersect the wrong, but does not touch the other finger metal plate. When the windshield is in a dry state, a dielectric is formed between the outer surface of the windshield and each finger shaped metal plate. When the windshield is wet, the dielectric constant varies with the amount of water in contact with the windshield. If the sensor is installed on the surface of the windshield or close to the lower surface of the windshield, this is beneficial to the work of the sensor, because this installation can make the sensor to play its best sensitivity. The disadvantage is that the capacitive sensor installed on the outer surface of the windshield will produce the same problem with the resistance sensor, the metal coating in the long-term work of the wipers will soon be scraped off the windshield.

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