Difference between special vehicle Euro VI and Euro V emission standards

In special vehicles, many people think that it is just an "upgrade on the exhaust pipe"; "just put a mask on the engine". In fact, if the emission upgrade between EURO/National Three, Four and Five is a change in quantity, then the upgrade between National Five and National Six can be understood as a qualitative change.

The relationship between the EURO/national five engine and the aftertreatment is how the engine works, how the original row is, and the aftertreatment basically does not interfere. Only when the nitrogen and oxygen compounds exceed the standard seriously, the aftertreatment cannot be dealt with or the SCR system fails, the aftertreatment will limit the engine‘s torque.

Among National Six engines, the engine‘s working condition is closely related to the post-processing. The condition of the original row is monitored by the post-processing system at any time, and the detected data is fed back to the engine at any time. , Exhaust and other adjustments to ensure that the engine under cold, idle, load and other conditions, the original exhaust nitrogen oxides, particulate matter, etc. meet the set requirements.

At the same time, OBD will also send the engine and post-processing operating conditions to the big data center set up by the country to supervise the engine.

To put it simply, during the National V emissions phase, the engine only needs to work according to a set procedure. As for the quality of the exhaust gas discharged into the atmosphere, the engine will not make corresponding adjustments.

In the sixth phase, the engine and post-processing work in coordination. After receiving the post-processing feedback data, the engine‘s operating conditions will make corresponding adjustments to ensure that the original row entering the post-processing meets the standard.