Four-wheel drive classification
The four-wheel drive is the driving force for all four wheels of the car. In this way, the power of the engine is distributed to the four wheels, and the wheel slip is less likely to occur when the road conditions are not good, and the passing ability of the car is considerably improved. The four-wheel drive system is mainly divided into two categories: half-time four-wheel drive (PartTime4WD) and full-time four-wheel drive (FullTime4WD).
The use of half-time four-wheel drive can be divided into two states: one is two-wheel drive, the car only has two wheels to get power, no difference from ordinary cars; the other is four-wheel drive, at this time the front and rear axles of the car are 50:50 Proportional distribution of power. The half-time four-wheel drive has a long history, and its advantages are simple structure and high reliability. It is more fuel-efficient after adding a free wheel hub (FreeWheelHub).
The full-time four-wheel drive is a four-wheel drive system that keeps the four wheels of the car at a constant driving force. To subdivide the full-time four-wheel drive system, it can be divided into two categories: fixed torque distribution (50:50 proportional distribution before and after) and variable torque distribution (variable before and after power distribution ratio). The full-time four-wheel drive also has a long history and is more reliable, but it consumes more fuel.