timely four-wheel drive only at the appropriate time will be converted into four-wheel drive, while in other cases still drive two-wheel drive system. The system will automatically switch the vehicle traveling road is a two or four-wheel drive mode, no manual operation. When
1. The timely four-wheel drive was born background
must have between each driving wheel
automobile differential to achieve high adhesion turn on the road, this is because of the different wheels turning timely speed four-wheel drive configuration diagram of guiding the actuator, is to eliminate this differential rotational speed differential member, four-wheel drive is based on this idea born, its role is to complete elimination of the center differential rear axle speed difference of work, so it can be implemented at any time to ensure the four-wheel drive. Four-wheel drive can not be achieved in a four-wheel drive state road cornering, because it has no center differential, so it can only be switched to manual mode in a timely manner when off-road, under normal circumstances can only use two-wheel drive. When in the market that the four-wheel drive structure is too complex, many models is not convenient arrangement, and the transmission rate is not high enough; and four-wheel drive need to manually switch a lot of trouble, while the driver of the high technical requirements, can not do more widelyPopular, it can automatically switch two drive and four-wheel drive four-wheel drive technology came into being timely.
2. timely four-wheel drive Milestones
timely start of the birth of four-wheel drive, four-wheel drive timely development has gone through three stages of development, construction and performance of each stage has the distinction. Early Due to limited timely four-wheel drive technology, the use of four-wheel drive models do not timely and full-time four-wheel drive compared to, either by nature or in terms of control limits, its performance is only between two drive and four-wheel drive of between. With advances in a timely four-wheel drive technology, the third generation of timely four-wheel drive performance was significantly improved, it works also has changed dramatically. .
Category 3 timely four-wheel drive system
The first is a viscous coupling type timely mechanical four-wheel drive, the second electrically controlled timely four-wheel drive type multi-plate clutch; first three are timely and intelligent electronic four-wheel drive.