On March 27, 2012, at the 2012 Asian Diesel Vehicle Emissions Forum, Dr. Zhang Zengteng, Deputy Director of the Weichai Power Research and Development Center, told the China Truck Network reporter that in the future, emissions from diesel engines of State IV and State V diesel engines will be mainstream in the adoption of scr technology. It will be mainly used for heavy vehicles. Weichai also uses the SCR technology route in the national IV and national V emissions. Weichai also said that a variety of technical routes will be implemented in parallel. EGR technology may also be used for vehicles that have special operating conditions.

Dr. Zhang Zengteng told reporters that EGR technology is generally used only under special circumstances. For example, when frequent shutdowns and exhaust gas temperatures are low (below 200 degrees Celsius), the efficiency of the scr post-processing system becomes lower and it does not play a good role in reducing emissions. In addition, in terms of fuel consumption, the use of EGR technology to meet the use of SCR technology to meet the country IV country V emissions will have about 3-5% of the fuel consumption disadvantages, so that SCR technology has become the mainstream of commercial vehicle country IV countries V emissions. Weichai will adopt the combination of two mainstream technologies: SCR+EGR+DPF+DOC only in Europe VI and above.