Heavy-duty diesel emission reduction technology adapted to China's national conditions

According to the different development priorities in different periods, the development of diesel engines can be divided into three phases: improving power performance, saving energy, reducing consumption, and reducing emissions. The rapid development of fuel injection technology and the use of supercharged and intercooled technology have made diesel engines increasingly functional and their power has been continuously upgraded. This is a stage for improving the dynamic nature; the non-renewability of oil resources and the ever-increasing shortage, the continuous increase in oil prices, and the need for economical users. A good diesel engine is a phase of energy saving and consumption reduction. With the emphasis on environmental protection and increasingly strict environmental protection regulations, diesel engines have entered the stage of emission reduction.

The formation of the expressway network has promoted the development of heavy-duty vehicles. At present, the proportion of heavy-duty vehicles in logistics and transportation has increased year by year. The rise in oil prices has led to a substantial increase in operating costs. Users need a diesel engine with good economy. Powertrain optimization matching can effectively reduce vehicle fuel consumption. China's heavy-duty vehicles are 5% to 10% more economical than Europe. SCR (Selective Catalytic Reduction) technology saves 5% of fuel compared to EGR (Exhaust Gas Re-Recovery Unit) technology, so SCR is a technical route that suits the conditions of China's heavy-duty diesel engines.

With the implementation of increasingly stringent emission regulations, pollution from the vehicle emissions to the atmosphere has been effectively controlled. From the perspective of vehicle emission standards, after the Euro III stage, the ratio of diesel engine's input and output on the emission has risen sharply; after the EU IV, the post-processing system may even produce secondary emission pollution; after the Euro V, the existing equipment has been difficult to accurately To measure emissions, it is therefore necessary to establish an emission standard system that suits China's national conditions.

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