IN SPEED

Rain sensor is a device in response to water and dirt on the front glass. The electronics automatically controls the wipers and wiper speed of adapting to the intensity of incident rainfall. The system features its automatic control of the vehicle increases comfort.

Cars equipped with dešťovým sensor controlled wipers automatically without any intervention by the driver. Electronics rain sensor can adapt to the speed of stripping current circumstances.

In the middle of rain sensor is located after the sensing diode and the outer circumference of several other radiation emitting diode. Radiation-emitting diodes are divided into two groups. The two groups alternately transmit infrared radiation, the reflection from the windscreen is to capture sensor diode.

The LED in the center of camera sensors alternately rain fall reflected rays from one and the second group leaky diodes. If the Rays fall to the same degree of intensity from both groups, not to any voltage sensing diodes. This situation corresponds to dry the windscreen.

In the case of wet conditions windscreen are a reflection of infrared rays and other quarry. One of the broadcast beam is again reflected from the glass, while the latter through the glass. The camera LED affects the radiation intensity is weaker. On sensing a signal voltage diodes.

Rain sensor uses a physical law of refraction waves in the transition from one optical medium to another. Under certain conditions, the total reflection (complete reflection), ie. that the waves from one environment to another does not penetrate at all. If there is a reflection or refraction angle depends on the impact of infrared rays. The angle of the impact of „alpha“ is the limit angle of total reflection. If they are on the outside of the windscreen violated the conditions of the quarry, there is also the condition of total reflection to refraction. This occurs if they are on the windscreen such as drops of rain. The condition of total reflection of the changes and waves enters glass.

When cars first appeared in the rain wipers were still on hand drive. They were small and poorly stíraly dirt. Later wipers were powered by electric motors and compressed air. These bikes were initially fixed the blurring speed and it was clear that for strong storms will sweep poorly, or vice versa in the low rainfall will scrub almost dry glass. Therefore, it is soon discovered multi-wipe or even wipe Adjustable speed blurring (cyklovačem). The final stages of development are automatic wipers with dešťovým sensor.

Source: z pramenů Škoda Auto

publication of article: 6. February 2009 | inclusion of article: Car-parts

translated from the Czech original by automatic translation

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