Is Audi full-time four-wheel drive quattro a patent? Other cars have full-time four

Quattro is a pure mechanical full-time four-wheel drive device, and its core is Torsen differential, which is a patent of Audi.

Of course, some Audi models (such as TT) also adopt the mechatronics four-wheel drive system based on Swedish Haldex.

The former is extremely stable and quite reliable. The latter has a faster high-speed response.

Other brands of four-wheel drive models are mechatronics, of course, including some sticky models (belonging to timely four-wheel drive system). Four-wheel drive is mainly divided into full-time, time-sharing and timely.

Correcting ID:ffwzj's point of view, Volkswagen Group only uses four-wheel drive for high-end models, most of which are front-wheel drive. Volkswagen's 4-Motion four-wheel drive system is not purely mechanical. Although Audi belongs to the public, it is different.