Is 4WD Full-Time Four-Wheel Drive or Part-Time Four-Wheel Drive?

[LaJourney]

4WD stands for four-wheel drive. Below is a detailed introduction to the different four-wheel drive system modes: 1. Full-time drive: The front and rear wheels always maintain a four-wheel drive mode, with the engine output torque distributed 50:50 between the front and rear wheels during driving. Full-time drive offers excellent driving control and tracking performance but is less fuel-efficient and not very economical. 2. Part-time drive: The driver can switch between two-wheel drive or four-wheel drive mode by engaging or disengaging the transfer case based on road conditions. This is the most common drive mode for general off-road vehicles or 4WD SUVs. 3. On-demand drive: The drive mode is controlled by the computer. Normally, (front) rear-wheel drive is used on regular roads. If the road conditions are poor or the drive wheels slip, the computer automatically detects it and immediately redistributes the engine output torque to the other two wheels, switching to four-wheel drive mode. This system is simple to operate.

[Avery]

I remember driving quite a few 4WD vehicles. 4WD actually refers to the four-wheel drive system, which can be divided into two types: full-time four-wheel drive and part-time four-wheel drive. Full-time four-wheel drive means the vehicle is always driven by all four wheels, with power continuously distributed to all wheels. This is suitable for complex road conditions such as snow, ice, or slippery surfaces, improving stability and reducing skidding. Part-time four-wheel drive, on the other hand, allows the driver to manually switch to all-wheel drive. Normally, it operates with either the rear or front wheels driving alone to save fuel, switching to full power only when needed, such as during off-road driving. I once drove in mountainous areas and found that switching to the part-time system significantly improved the ability to climb steep slopes. However, forgetting to switch could damage the drive shaft, so I recommend beginners practice the operation to avoid misuse. Also, pay attention to maintenance, regularly checking fluids and connecting components to prolong the lifespan.