How to use part-time four-wheel drive in rain or snow?

How to use part-time four-wheel drive in rainy and snowy weather: 1. Part-time four-wheel drive is a drive mode manually switched by the driver. The driver can select two-wheel drive by turning on or off the transfer case. Or four-wheel drive mode; 2. Part-time four-wheel drive is a form of four-wheel drive vehicle drive system, which means that the driver can change the two-wheel drive or four-wheel drive mode by turning on or off the transfer case according to the road conditions. wheel drive mode, thereby realizing the driving mode of free conversion between two-wheel drive and four-wheel drive; 3. Structural time-sharing four-wheel drive is generally classified according to the structural domain function, and can be divided into 4WD for FR cars and 4WD for FF cars. The structure shows that the engine's power is transmitted in the order of the transmission, transfer case, front and rear drive shafts, main reducer and differential, drive shaft, and wheels; 4. Principle When driving with four-wheel drive, the transfer case is used to The other two wheels, which are not driven, transfer power. An ordinary transfer case can switch between two-wheel drive and four-wheel drive, and can also change high speed and low speed. For example, if there is a 5-speed forward gear, its structure can be divided into 5-speed (4WD.H or 2WD.H) for driving on ordinary roads and 5-speed (4WD.L) for driving on uneven roads.