How do they work? Most of time they work fine in my car but usually it goes crazy max speed even when there’s little rain, and also at lowest speed when it’s pouring rain…
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Many use a dedicated [rain sensor](https://www.trueblueautoglass.com/windshield-rain-sensor/) that detects rain or water on the windshield by a change in how light passes through it when water is present on the surface of the glass. Some cars use an existing full camera and image processing to identify when there is water on the windshield.
There are some drawbacks to automatic wipers, as you noted, as they may mis-judge the amount of rain/water. Further, they are usually only looking at a small part of the windshield, so if there’s a lot spray coming up from the road that is obscuring the view mostly far from the sensor, it may not trigger at all.
I find that mine work pretty well most of the time, but I occasionally have to tap the single-wipe button or turn it up/down a touch. It seems pretty good, but it’s not perfectly matched to my preferences at least.
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