The Tier 4 Final technology will be integrated into Komatsu America construction and mining engines ranging from 3.3 to 46 liters starting in January 2014.
The new Heavy-Duty Aftertreatment System combines a Komatsu Diesel Particulate Filter (KDPF) and Selective Catalytic Reduction (SCR). The SCR NOx reduction system injects the correct amount of DEF at the proper rate, thereby decomposing NOx into non-toxic water and nitrogen gas.
The Heavy-Duty Cooled Exhaust Gas Recirculation (EGR) System recirculates a portion of exhaust gas into the air intake and lowers combustion temperatures to reduce NOx emissions. A high-efficiency compactly designed cooling system increases EGR gas flow, which reduces NOx and helps reduce fuel consumption.
The advanced electronic control system performs high-speed processing from sensors installed in the vehicle and engine to help reduce NOx and particulate matter emissions, while improving fuel consumption and noise. The machine operator is informed of engine conditions via the on-board color monitor inside the cab.
The Komatsu Variable Geometry Turbocharger (KVGT) system features proprietary hydraulic technology for variable control of intake air-flow and supplies proper amounts of air according to load conditions. The machine's control system uses the KVGT to provide precise exhaust temperature management for the regeneration process.
Building on the technology in previous Komatsu engines, the new Heavy-Duty High-Pressure Common Rail (HPCR) Fuel Injection System uses higher-pressure injection for better fuel atomization, reducing both particulate matter emissions and fuel consumption under the wide range of engine operating conditions.
Komatsu America Corp. announces the introduction of its new EPA-certified Tier 4 Final diesel engines, built on Komatsu’s progressive engineering improvements to reduce emissions. The Tier 4 Final technology will be integrated into the company’s construction and mining engines ranging in size from 3.3 to 46 liters and start commercial production in January 2014.
Komatsu’s Tier 4 Final solution builds on proven technologies the company has utilized for Tier 4 Interim engines. Examples include next-generation high-pressure common rail fuel injection (HPCR) system; high-efficiency exhaust gas recirculation (EGR) system; Komatsu Variable Geometry Turbocharger (KVGT); and Komatsu Diesel Particulate Filter (KDPF).
In addition to refining these technologies through Komatsu’s continuous improvement activities, the company has also developed aproprietary Selective Catalytic Reduction (SCR) device. This Tier 4 Final solution with the addition of SCR provides a high amount of passive regeneration of the KPDF with minimal impact on machine operation and production.
All Komatsu Tier 4 Final construction machines come with Komatsu CARE, which provides scheduled factory maintenance for the first 2,000 hours or three years.