Cummins announced its QSX15 engine will meet near-zero emissions levels effective in 2014 with power output increased up to 675 hp (503 kW). The 15-liter diesel is designed to comply with EPA Tier 4 Final and EU Stage IV emissions with an aftertreatment system combining the Cummins Particulate Filter with Selective Catalytic Reduction (CPF- SCR). The new 675-hp top rating for the QSX15 takes the Tier 4 Final engine 75 hp (56 kW) above the Tier 4 Interim top rating of 600 hp (447 kW). Cummins says its SCR system for Tier 4 Final incorporates a copper zeolite-based catalyst capable of up to 95% NOx conversion while operating efficiently at lower temperatures. The system features advanced sensors to provide full closed-loop control, while Diesel Exhaust Fluid (DEF) dosing levels are minimized with enhanced mixing in the decomposition pipe. Cummins also noted the complete engine package carries forward the same overall size from Tier 3 to Tier 4 Interim and Tier 4 Final, and the QSX engines retain a single Cummins Variable Geometry Turbocharger (VGT) instead of the dual turbos required by some competitors.

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