Can timely four-wheel drive vehicles be tested on the rollers?

It can be checked on the roller. However, the method is somewhat special. Unlike the two-wheel drive system, the two-wheel drive system uses the simulated driving condition method, while it uses the double-idle speed method. The double-idle speed belongs to no-load detection. Emission detection is carried out in two idling sections at idling speed.

Models with four-wheel drive systems include Qashqai from Dongfeng Nissan, Tiguan from Shanghai Volkswagen, rav4 from Toyota, CRV from Honda and so on. The structure of the four-wheel drive system is relatively simple, and the cost required is relatively low. It can increase the ability of the vehicle to get out of trouble, and is suitable for driving on roads with unstable road conditions. But it will have more power in the front of the vehicle than in the rear. Compared with the simple steady-state method, there are differences in the detection of nitrogen oxide emissions. Using the dual-idle method, the NOx is very low, so there is no need to check the NOx level. The timely four-wheel drive system does not need to be turned on manually, it will be turned on automatically. It is more convenient when sending the vehicle for inspection. You only need to tell the staff the vehicle configuration.