As a magic car, the four-wheel drive system of 2013 Volkswagen Tiguan is the focus of everyone's attention. Once the 4MOTION intelligent full-time four-wheel drive system of Volkswagen Tiguan is launched, it has attracted numerous disputes. What is the performance of the four-wheel drive system? Is it a full-time four-wheel drive or a timely four-wheel drive?
At the beginning of tuguan's listing, it earned enough attention with the gimmick of "God car increases the price by 30000", and "all-round four-wheel drive king". However, whether it's a four-wheel drive king or not, we focus on its four-wheel drive structure. Let's take a look at the four-wheel drive structure chart on the official website of Volkswagen to know whether it's true or not.
It can be seen from the picture that what this shows is a set of timely four-wheel drive system. On the normal road, the four-wheel drive system will not be involved. The front and rear power ratio is 100:0, which is a two drive vehicle. When the road surface slips or the start is too strong, the four-wheel drive system will be started intelligently, and the ratio of front and rear wheels is 50:50. Hang sheep's head to sell dog's meat, firm end.
Now let's take a look at the performance of this 4MOTION intelligent all-time four-wheel drive system. This system was jointly developed by Volkswagen and Haldex, a Swedish four-wheel drive developer. Its key technology is in the differential with Haldex LSC, which has already appeared in the early Touareg models, but the fourth generation Haldex LSC is used by Tiguan.
In short, 4MOTION is a multi piece clutch structure, which is different from the pure mechanical structure of Audi Quattro's Thomson differential. Haldex's principle is to add a group of hydraulic pumps driven by the output shaft between the front and rear axles, and the friction plate is pushed by the hydraulic device to realize the torque distribution.
The output shaft is connected with the housing, and a lot of clutch plates are installed inside the housing. Under the action of strong hydraulic pressure, the piston can push the clutch plates laterally to engage, and generate strong friction, so as to transfer the power to the rear wheel. The hydraulic pressure is completely controlled by the computer control of the solenoid valve.
Therefore, in the final analysis, the four-wheel drive system is still controlled by ECU, and the standard intelligent timely four-wheel drive system. However, due to the lack of the locking function of manual control differential lock, the off-road performance is greatly reduced compared with Qijun, and the road performance is insufficient compared with the forest man's full-time four-wheel drive, but it is sufficiently balanced. Compared with the Japanese CRV, RAV4 is still much worse.