Why country six is more expensive than country five
China is a country with a very large number of vehicles, and as a result, China ’s exhaust emissions have almost reached the highest value. It is not long before the implementation of the National Five Standard, and the National Six comes. In recent years, due to the smog that hits our country every winter, we can hardly see the blue sky and white clouds, and it is urgent to control the environment. Therefore, in many regions, State Six has arrived ahead of schedule. Many people ask why National Six is so much more expensive than National Five.
Hubei Chengli fire truck manufacturers explain the meaning of these processing systems:
全称为排气再循环（ Exhaust Gas Recirculation ），内燃机在燃烧后将排出气体的一部分分离出、并导入进气侧使其再度燃烧的技术（手法或方法）。 1. EGR: The full name is exhaust gas recirculation ( Exhaust Gas Recirculation ). After combustion, the internal combustion engine separates a part of the exhaust gas and introduces it to the intake side to make it burn again. ）与分担部分负荷时可提高燃料消耗率。 The main purpose is to reduce the nitrogen oxides ( NOx ) in the exhaust gas and increase the fuel consumption rate when sharing part of the load.
氧化型催化器， DOC技术也就是柴油机排气后处理的氧化催化技术。 2.DOC: Oxidation type catalytic converter, DOC technology is the oxidation catalytic technology of diesel engine exhaust aftertreatment. 以铂(Pt) 、钯(Pd)等贵金属作为催化剂，主要降低微料排放中SOF的含量，从而降低PM的排放 Oxidation catalytic converters (DOC) use precious metals such as platinum (Pt) and palladium (Pd) as catalysts, which mainly reduce the SOF content in particulate emissions, thereby reducing PM emissions.
称为颗粒捕捉器，是指废气中的颗粒物，被收集和捕捉的装置。 2.DPF: It is called particle trap, which refers to the device in which particulate matter in the exhaust gas is collected and captured.
选择性催化还原技术，这个我们国四，国五车型中遇到的最多，也就是俗称的尿素系统。 3.SCR: Selective catalytic reduction technology. This is the most commonly encountered in our National IV and National V models, which is commonly known as the urea system.
氨气氧化催化器，作用为消除过量或逃逸出来的NH3 。 4.ASC: Ammonia oxidation catalyst, which is used to eliminate excess or escaped NH3 .
和ASC,才能达到国六的排放标准，也因此后处理系统中需要增加一系列的传感器，执行器和闭环控制策略，以支持DOC-DPF-SCR的监控，控制和正常工作。 National VI system needs to be added to National V system, DOC, DPF and ASC, in order to meet National VI emission standards. Therefore, a series of sensors, actuators and closed-loop control strategies need to be added to the post-processing system to support DOC- DPF-SCR monitoring, control and normal operation. The National Six standard can reduce more particulate matter and lower the emissions of non-methane organic gases and nitrogen oxides than the National Five.