Layout of car units

3.2.3.g All-wheel drive options

There are two main options of all-wheel drive

• Full-time all-wheel drive
  This is when all four wheels perceive rotation from the engine constantly.
• Part-time all-wheel drive  (most of all modern passenger cars are equipped exactly according to this scheme). In this case, the front or rear wheels are connected (in addition to the main drive wheels) to the engine thrust through a special mechanism (clutch), only when the electronics deems it necessary, for example, in case if the main wheels start slipping.