BMW's patented xDrive sets a new standard in the sensitivity of all-wheel drive. Its job is to quickly change the torque distribution of the front and rear axles to provide real driving stability, driving pleasure and safety performance.
XDrive can be completely adjusted and changed infinitely. It will calculate the situation of understeer or oversteer when turning, and provide the most suitable torque for the required axle at any time.
Advantages of BMW xDrivex four-wheel drive system:
The core technology of the drive system is the four-wheel drive system developed by Magna Steyr of Austria. Its working principle is to continuously adjust the torque distribution. In addition, the torque distribution can be continuously changed according to the road conditions, and the maximum torque required by each front and rear wheel can be effectively transmitted.
It is worth mentioning that the xDrive system has a default front-rear torque distribution of 40: 60, and the maximum front-rear torque distribution ratio is between 0: 100- 100:0, and its torque distribution can be completed quickly within 0. 1 second.
Shortcomings of BMW xDrivex four-wheel drive system;
This four-wheel drive system does not have the mechanical central differential like Mercedes-Benz Audi. Its central differential adopts electronically controlled multi-disc clutch, and the front and rear are open differential, which relies heavily on electronic auxiliary function. Although it can quickly change the power distribution of the front and rear axles, it can restrain the roll and maintain the posture of the car body.
BMW xDrive relies too much on electronic system, which is not durable for high strength and frequent speed difference, and also makes BMW xDrive four-wheel drive system not suitable for off-road. At the same time, the maintenance cost of this four-wheel drive system is also very expensive. BMW xDrive four-wheel drive structure is more used for urban road conditions.
The above contents refer to Baidu Encyclopedia -xdrive.