The off-road China emission standard phase IV was officially implemented on December 1, 2022.The emission limits and technical requirements are comparable to the current standards of Europe and the United States, which are in line with international standards, and are more advanced in terms of actual emission control of the whole machine. The implementation of emission phase IV has promoted the control of emission pollution from off-road construction machinery to a new stage. As a pioneer of industrial power technology, Dongfeng Cummins inherits the excellent technology, relies on its own research and development for many years and excellent product quality, and is fully prepared in the field of off-road emission phase IV, and has a number of independent technologies in off-road products.
Dongfeng Cummins' off-road products include B3.9, B5.9, B6.7, L9, L9 Plus, M14, M15 Plus, seven platforms, displacement coverage of 3.9-15L, horsepower segment coverage of 80-650HP. It has proven in-cylinder combustion optimization technology, high-efficiency turbocharging technology, a new generation of fluid and heat transfer technology, continuous iteration of intelligent electronic control technology, the use of continuous innovation fuel and filtration systems, continuously upgraded after-discharge treatment systems, and comprehensive adaptation more flexible, intelligent digital remote services, saving trouble.
The most important is the upgrade of the post-emission treatment system, Dongfeng Cummins off-road emission phase IV products mainly adopt two emission technology routes: one is the technical route of high-pressure common rail + EGR + DOC + DPF, which is mainly used in B3.9, B5.9 small and medium-sized platforms; The second is to adopt the technical route of high-voltage common rail + DOC + DPF+SCR, which is mainly used in medium and heavy platforms such as B6.7 and L9.
Dongfeng Cummins EGR technology uses hot-end high-pressure closed-loop control frame technology to optimize EGR flow calibration logic, focus on improving carbon deposition resistance and corrosion resistance, and improve adaptability, reliability and emission control for off-highway applications. On the DPF unit, Dongfeng Cummins has re-developed the matching and applied the new thermal management technology solution and the latest carrier-coating scheme to meet the PN limit and thermal management needs, while effectively extending the life of parts and reducing system costs. Dongfeng Cummins also uses high-efficiency SCR with a conversion efficiency of more than 98% to further meet emission requirements while maintaining fuel economy.
Up to now, the off-road emission phase IV products have been fully matched in many major fields such as excavators, tractors, harvesters, mobile generator sets, concrete pumping, mining dump trucks, etc., and have won widespread praise and trust.