PARIS (January 12, 2012) - Cummins Inc. (NYSE: CMI) will highlight the QSX15 engine with up to 503 kW (675 hp) power output and near-zero emissions capability for heavy-duty applications at the INTERMAT construction industry show in Paris, April 16-21. 


The 15-litre engine utilises a next generation ultra-clean aftertreatment system, combining the Cummins Particulate Filter with Selective Catalytic Reduction (CPF-SCR)  to meet EU Stage IV and EPA Tier 4 Final emissions, commencing Jan.1, 2014.


The 503 kW (675 hp) at 2100 rpm top rating for the QSX15 takes the Stage IV and Tier 4 Final engine 56 kW (75 hp) above the Stage IIIB / Tier 4 Interim 2011 top rating of 447 kW (600 hp). Peak torque is almost 2800 Nm. Engine power density increases to 34 kW (45 hp) per litre to offer a new level of power capability for premium performance machines operating in the toughest construction equipment applications. 


To meet the 2014 regulations, Particulate Matter (PM) reduces to 0.02 g/kW-hr, and Oxides of Nitrogen (NOx) reduce to 0.40 g/kW-hr. Compared to Stage IIIB and Tier 3 emissions levels, this represents a 90 percent reduction in both PM and NOx. The near-zero emissions levels are achieved while also improving fuel-efficiency and power output. 


At current Stage IIIB and Tier 4 Interim emissions levels, the QSX15 engine is  capable of achieving up to 5 percent improved fuel efficiency, depending on duty cycle  and machine optimisation. Fuel efficiency will be further increased by an additional 3 percent to 4 percent for Stage IV and Tier 4 Final.                              


The CPF-SCR ultra-clean aftertreatment raises the threshold of what can be achieved when lowering emissions and improving fuel efficiency, by precisely balancing emissions control between the aftertreatment and engine combustion with cooled Exhaust Gas Recirculation and the Xtra-High Pressure Injection (XPI) fuel system. With this higher threshold, the QSX15 realizes both higher fuel efficiency and improved power output. 


This capability to design, integrate and manufacture all the key engine technologies   and aftertreatment as a single system provides a unique advantage for Cummins.                          


Pre-Designed For Final 

The ability of the QSX15 to move forward to meet the 2014 near-zero emissions standards is pre-designed into the existing engine platform, with no significant change required for the engine system architecture. The engine retains a single Cummins Variable Geometry Turbocharger (VGT™), avoiding the complexity of needing two turbochargers to achieve high power output.


The QSX15 engine continues to offer an installation advantage with a smaller envelope space claim than many equivalent output engines. The need for machine integration flexibility at Stage IV and Tier 4 Final is also recognised, with the CPF-SCR aftertreatment system available in multiple configurations, including switchback, horizontal and vertical. 


Cummins Direct Flow™ air cleaner technology brings a further installation advantage with a smaller profile than typical cylindrical cleaners, together with the benefit of extended service change intervals. 


CPF-SCR Ultra-Clean Aftertreatment 

The SCR system developed by Cummins for Stage IV / Tier 4 Final is a next-generation design that moves beyond current SCR technology, incorporating a copper zeolite-based catalyst capable of up to 95 percent NOx conversion and able to operate more efficiently at lower temperatures. The system features advanced sensors to provide full closed-loop control. AdBlue diesel exhaust fluid dosing levels are minimised with an enhanced mixing technique. 


The Cummins Particulate Filter (CPF) includes both a diesel oxidation catalyst and  the wall-flow filter, providing an additional margin of PM emissions control at the higher engine loads and power outputs of heavy-duty engines. With this higher PM filtration efficiency, the engine combustion can be formulated to increase power density and lower fuel consumption. 


The integration of SCR into the exhaust aftertreatment allows the CPF to reduce the frequency and duration of active regenerations below 1 percent of equipment operating time, creating a virtually full-time passive device. 


Cummins experience with SCR technology is unrivaled in the industry, dating to 2005. Today, over 300,000 Cummins on-highway SCR engines are operating in Europe and North America. This enables Cummins to leverage preceding on-highway technology to deliver the right emissions solution, fully optimised for construction equipment customers.                        


About Cummins Inc. 

Cummins Inc., a global power leader, is a corporation of complementary business units that design, manufacture, distribute and service engines and related technologies, including fuel systems, controls, air handling, filtration, emission solutions and electrical power generation systems. Headquartered in Columbus, Indiana (USA), Cummins employs approximately 40,000 people worldwide and serves customers in approximately 190 countries and territories through a network of more than 600 company-owned and independent distributor locations and approximately 6,000 dealer locations. Cummins earned $1.0 billion on sales of $13.2 billion in 2010. Press releases can be found on the Web at or Follow Cummins on Twitter at and YouTube at