How It Works: The magic behind some of your vehicle's features — via drivingdotca automotive carfeatures
It’s because auto-up windowshave an auto-reverse sensor. If the sensor detects something in the way, such as fingers, the window motor immediately reverses direction to avoid injury. If the automaker didn’t opt to spend for that sensor, your window is auto-one-way only.No one likes being blinded by headlights from behind, and so your rearview mirror is equipped to gear down the glare.
Auto-dimming mirrors use two pieces of glass, coated with electrically-conductive material. Between them is a layer of electrochromic gel, which darkens when exposed to electric current. When it’s dark outside, sensors monitor light hitting the mirror. When headlights are detected, the control unit sends electricity to the glass, and the gel darkens. Once the lights are gone, the power switches off, and the gel goes clear again.
Most use a sensor mounted behind the windshield, close to the rearview mirror. Whenever the wiper switch is turned on, the sensor aims infrared light at the glass, at a 45-degree angle, and then determines how it reflects back. Water droplets reflect the light differently, and this tells the sensor it’s raining, and how much, so it can activate the wipers.Article contentAutomatic headlamps come on by themselves, using a photoelectric sensor on top of the dash, or by the rearview mirror.
An increasing number of vehicles add automatic high-beam headlamps. These use a forward-facing camera or sensor to assess how much light there is overall — you want high-beams on a dark rural road, not in a brightly-lit city. If the area is sufficiently dark, the high-beams come on. If the sensors detect oncoming headlights, they shut the high-beams off, and then switch them back on when it’s completely dark again.
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