What is the difference between BMW full-time four-wheel drive and timely four-wheel drive?

Full-time driving and timely driving refer to two different automobile driving modes. Since they are two modes, there are naturally great differences.

For people living in the south, four-wheel drive is synonymous with off-road and off-road vehicles, but in fact, in the case of slippery roads in rainy days, the role of four-wheel drive is also immediate. For the northern region with long winter, the four-wheel drive has a deeper experience, and the stability it can provide when driving on ice and snow roads is incomparable with the two-wheel drive. So now not only SUVs, but also many models of cars are four-wheel drive systems.

However, due to the complex structure and relatively high cost, automobile manufacturers often only provide four-wheel drive systems for higher-priced models. Simply put, the driving mode is divided into four-wheel drive > rear drive > front drive. BMW's new X 1 and 1 series cars (parameter | picture) have abandoned the iconic rear-drive form and switched to UKL front-drive platform, because the front-drive structure is simpler and the cost is lower. In addition to the change of front and rear drive modes, the four-wheel drive form of BMW X 1 high-equipped models has also changed from the previous full-time four-wheel drive to the current timely four-wheel drive.

Full-time four-wheel drive and timely four-wheel drive are unique, and it is easy to feel a business trip when used in BMW.

Timely four-wheel drive features: simple and cheap, but the performance is the weakest.

The so-called timely four-wheel drive means that the system will automatically switch to two-wheel drive or four-wheel drive mode according to the driving condition of the vehicle, and this process does not require manual operation. Compared with the part-time four-wheel drive system, this four-wheel drive system avoids complicated manual operation, and there is no need to worry about the damage of the four-wheel drive system caused by improper switching, and even the four-wheel drive system is not aware of it in many cases.

The characteristics of full-time four-wheel drive: complex and expensive, good performance, generally beyond the reach of diaosi.

AWD often appears at the rear of some SUV models. In fact, this is the abbreviation of full-time all-wheel drive. The so-called full-time four-wheel drive means that the four wheels of a car can independently provide driving force at any time, and the four-wheel drive mode is always maintained during driving. The output torque of the engine is distributed to the front and rear wheels according to a certain proportion, which has good off-road performance and maneuverability.

Full-time four-wheel drive has simple structure and high reliability, but it needs manual switching. At present, it is mostly used for hard-core off-road vehicles. Timely four-wheel drive vehicle is easy to operate and widely used in urban SUV models, but its performance is the weakest. Full-time four-wheel drive is mostly used in mid-to high-end SUV models, with excellent road performance, but complex structure, expensive price and less reliability than part-time four-wheel drive.

But no matter what kind of four-wheel drive device is used in the car, it is very good.