Classification and advantages and disadvantages of four-wheel drive

The difference between real-time four-wheel drive, part-time four-wheel drive and full-time four-wheel drive:

• 1. real-time four-wheel drive is a relatively intelligent four-wheel drive system. When a wheel slips or cannot move forward, it will automatically convert to four-wheel drive.

• 2. Part-time four-wheel drive is the model with the strongest off-road capability, with simple structure, low cost and low fuel consumption, and good flexibility.

• 3. For full-time four-wheel drive, the power is transmitted by the four wheels at any time, and the output torque of the engine will distribute the power to the four wheels according to the power distribution ratio.

Advantages and disadvantages of real-time four-wheel drive:

Advantages: No need for manual adjustment, simple structure, low cost, certain off-road capability, lower weight of the vehicle body, and more economical fuel

Disadvantages: When the front and rear axles transmit power, they will be limited by the defects of the structure itself, and cannot transmit more than 50% of the power to the rear axle. The active safety is not as high as that of the full-time four-wheel drive. With an open differential, it is impossible to get out of trouble when encountering complex road conditions, especially when two wheels slip. Off-road performance needs to be further improved.

Advantages and disadvantages of part-time four-wheel drive:

Advantages: purely mechanical structure, high reliability, good passability, strong off-road escape ability, can not only ensure the power and passability of the vehicle, but also take into account fuel economy.

Disadvantages: The mechanism is heavy, fuel consumption is high, and it is cumbersome to operate. You need to judge the road conditions by yourself and manually operate the driving mode.

Advantages and disadvantages of full-time four-wheel drive:

Advantages: It has good off-road and handling performance. After any wheel slips, the other 3 wheels will continue to maintain the forward direction of the car, preventing the body from losing stability and tracking due to the slipping of the driving wheels. The design is perfect and ensures various Driving under road conditions.

Disadvantages: high cost, more electronic system control units, relatively higher failure rate, can't make adjustments for twist distribution according to road conditions, high fuel consumption, and poor economy.