If you look carefully, you can find that Audi is basically used in the national five models, the national six models are used in the timely four-wheel drive, and the Audi A4L is no exception. As for why Audi is different from the four-wheel drive model in the National V model and the National VI model, it involves the development of the Audi four-wheel drive system.
Many people say that Audi changed Towson's full-time mechanical four-wheel drive to electronic timely four-wheel drive is a reduction in allocation, but I feel that Audi has made the right choice in line with the development of the times.
The evolution of Audi's four-wheel drive system
Audi's four-wheel drive system, the well-known quattro four-wheel drive system, originated in the 1980s, whether it is a mechanical full-time four-wheel drive based on the Towson A/B/C central differential, or a timely four-wheel drive system that controls a multi-piece clutch central differential, all belong to the category of Audi quattro four-wheel drive system. This system has undergone 7 generations of changes, and the current Audi currently uses the quattro ultra electronic control four-wheel drive, but no matter which generation, it can not shake the status of audi this system road king.
The first generation: hollow drive shaft
Second generation: Towson Type A central differential
The third generation: Towson A type central differential + electronically controlled multi-plate clutch type central differential
Fourth Generation: Towson Type B Central Differential (EDL Electronic Differential Lock)
Fifth generation: Improved version of the Towson A differential
Sixth generation: quattro mechanical four-wheel drive system
Seventh generation: quattro ultra electronically controlled four-wheel drive system
Because the evolution of Audi's four-wheel drive system is too complicated, the simple summary is the development from mechanical structure to electronically controlled multi-plate clutch type central differential, from full-time four-wheel drive to timely four-wheel drive.
Is going from Towson to an electronically controlled clutch a step backwards?
It is undeniable that the structure of the Towson central differential has no clutch, does not require preload, and can react in time only by relying on pure mechanical structure, with faster response and more stable performance. But the biggest problem with this system is fuel economy, Towson's four-wheel drive structure can be up to 40/60 torque distribution front and rear, focusing on the rear drive, it is difficult to take into account fuel efficiency. And the vast majority of people who buy Audi four-wheel drive system will not drive this system to off-road, and the quattro ultra electronic control four-wheel drive system in the case of road driving is fully competent.
And the quattro ultra can achieve high fuel economy by disconnecting the multi-plate clutch and the claw-tooth clutch on the rear axle to fully deliver 100% power to the front axle. According to the official introduction, this system can reduce fuel consumption by 0.3L per 100 kilometers compared with the previous generation, and in the case of increasingly stringent emission standards, Audi has to compromise with fuel economy.
Tail: For consumers, in fact, we do not need to worry about the change from the Towson central differential to the electronic control multi-plate clutch, in today's automotive environment, fuel consumption saving has become the trend of the times, mechanical four-wheel drive structure has slowly become a small and beautiful cold door product, and embraced the new trend, made the right choice.