21:27 26-10-2025

Mercedes-Benz patents thunder-triggered auto-closing convertible roof

Mercedes-Benz files a patent for a storm-sensing system that listens for thunder and auto-closes a convertible's roof, with remote app and fob control.

Mercedes-Benz has filed a patent for an unusual technology designed to spare convertible owners from rain-related trouble. In a document titled Closing the roof and windows based on a thunderstorm forecast, the company describes a system that listens for thunder and automatically raises the roof.

The concept relies on external microphones already used in many modern cars to recognize emergency sirens. These sensors feed audio to a controller that analyzes the soundscape and decides when a storm is starting. Mercedes also proposes using multiple microphones to pinpoint the direction of thunder, while wind sensors would help determine whether the storm is moving in.

There is a clear catch. The patent does not detect rain itself—it reacts only to thunder and lightning. If a shower arrives without thunder, the convertible would stay open, putting the cabin at risk.

Even so, it nudges cars toward more intelligent behavior, where electronics quietly look after the owner. And there’s a practical addition worth considering in parallel: the ability to close the roof via a key fob or an app.