BMW’s Wild Patent Uses Motors to Make EVs Noisy

BMW engineers have filed a brand new patent that takes an uncommon method to a reasonably simple downside: the right way to make electrical automobiles noisy sufficient for pedestrians to listen to them. Proper now, most EVs and hybrids use exterior audio system to emit sounds at low speeds, typically required by regulation to forestall silent autos from shocking pedestrians. However BMW’s patent proposes ditching these audio system solely.

The Concept: Make Noise With What’s Already There

As a substitute of including audio system, the patent outlines a technique of utilizing current electrical motors within the automobile—like those who energy your home windows, windshield wipers, or tailgate—to generate sound. By pulsing these motors in a sure manner, they might produce audible tones. BMW even suggests combining the operation of a number of motors to create layered or directional sounds, which may then be amplified utilizing particular housings or resonators.

In concept, it’s a intelligent workaround. Audio system take up house, add a little bit of weight, and require wiring and mounting factors. If you need to use {hardware} that’s already put in, that’s much less complexity within the system.

The Catch: It’s a Little bit of a Stretch

The sensible points are the place this concept begins to collapse. First, most of these accent motors appear to be buried deep inside doorways or hatches—not ultimate locations for projecting sound. Second, they weren’t designed to make noise within the first place, so making them loud sufficient (and in the suitable frequencies) would require further housings or resonators—presumably offsetting any house or weight financial savings.

In comparison with others’ implementations, BMW’s thought takes it a step additional through the use of precise working parts to do the job. However as a substitute of including to the driving expertise, the objective right here is strictly practical: to warn others {that a} car is close by.

As at all times, simply because a patent was stuffed, doesn’t imply BMW will go for that implementation, so for now, let’s take this with a grain of salt.

[Source: WIPO.int via CarBuzz]