感应雨刷参数配置

简介

感应式雨刷器能通过雨量传感器感应雨滴的大小,自动调节雨刷运行速度,为驾驶者提供良好的视野,从而大大提高雨天驾驶的方便性和安全性。


『雨量传感器』

工作原理

目前应用较广的两种主流传感器分别是光学式传感器和电容式传感器。光学式传感器是根据光的折射原理工作的。在光学式传感器中有一个发光二极管,它发出一束锥形光线,这束光穿过前挡风玻璃。当挡风玻璃上没有雨水、处于干燥状态的时候,几乎所有的光都会反射到一个光学传感器上,当下雨的时候,挡风玻璃上会存有雨水,一部分光线就会偏离,这就造成了传感器接收到光的总量的变化,从而检测到了雨水的存在。光学式传感器能够接收反射光的面积越大,得到的信息就越详尽。光学式传感器十分精确,甚至有可能准确地判断出落在被感应区域上的雨点数目。

另一种是电容式传感器,它主要是利用水和玻璃的介电常数的巨大差异设计的,其中水的介电常数为80,玻璃的介电常数为2。通常的做法是,把两条呈平行状态的指状金属极板放入挡风玻璃的内、外层之间,一组指状金属极板相交错,但是并不触及其他的指状金属极板。当挡风玻璃处于干燥状态的时候,挡风玻璃外表面和每组指状金属极板之间就形成了电介质。当挡风玻璃变湿的时候,根据与挡风玻璃接触的水量的不同,挡风玻璃的介电常数发生不同的变化。如果把传感器安装在挡风玻璃的表面上或者紧贴在挡风玻璃的下表面,这对传感器的工作是有利的,因为这样的安装能使传感器发挥其最佳灵敏度。不利的是,把电容式传感器安装在挡风玻璃的外表面上会产生与阻力传感器同样的问题,其金属镀层在雨刷的长期工作下会很快被从挡风玻璃上刮掉。

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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