Cummins Announces 16-Liter QSX for Tier 4 with Integrated Air Intake to Exhaust Aftertreatment
11 March 2008
LAS VEGAS (March 11, 2008) - Cummins Inc. (NYSE:CMI) announced today at the CONEXPO-CON/AGG show that the Heavy-Duty QSX engine will be available with a fully integrated air intake to exhaust aftertreatment system to meet U.S. EPA Tier 4 Interim and European Stage IIIB off-highway emissions regulations in January 2011. The Tier 4 QSX increases displacement to 16 liters and incorporates the XPI High Pressure Common Rail fuel system to enhance power output and engine response.
Very low emissions levels are achieved with Cummins Particulate Filter exhaust aftertreatment that reduces Particulate Matter (PM) emissions by 90 percent and cooled Exhaust Gas Recirculation that reduces Oxides of Nitrogen (NOx) by 45 percent. The Tier 4 QSX also features a Cummins crankcase filter to eliminate blowby gas emissions.
Performance-enhancing Tier 4 technology brings a significant increase in QSX power output with an unrestricted top rating of 650 hp (485 kW) compared to 600 hp (447 kW) for the current Tier 3 QSX. Ratings will extend down to 400 hp (298 kW) to cover a broad range of heavy-duty applications. Peak torque is increased by 12 percent to 2150 lb-ft (2915 N.m) with faster torque delivery available across the engine rpm range.
"The next-generation Tier 4 QSX goes beyond meeting very low emissions levels to also offer higher levels of heavy-duty productivity than the Tier 3 QSX," said Ric Kleine, Vice President, Cummins Off-Highway Business.
"The QSX will continue to be the heavy-duty engine of choice for high-power equipment with very demanding duty cycles. We have been able to increase engine power and improve engine response for Tier 4 by increasing displacement and incorporating high-performance technologies such as Cummins XPI High Pressure Common Rail fuel system, a Variable Geometry Turbocharger and the new Direct Flow air filtration system. These subsystems are designed to offer an equivalent level of dependability to match that of the proven Heavy-Duty QSX base engine platform.
"While cooled EGR is primarily employed to reduce NOx emissions, we can also utilize this process to influence the combustion formula and realize fuel efficiency improvements. This will achieve up to 5 percent higher fuel efficiency for the Tier 4 QSX compared to Tier 3, depending on rating and duty cycle," added Kleine.
Cummins XPI fuel system enables multiple injection events with very high fuel injection pressure across all engine rpm speeds to enable both cleaner combustion and improved engine response. The XPI fuel system is complemented by a Cummins Variable Geometry Turbocharger with a sliding-nozzle design. The nozzle continuously varies the airflow boost to precisely match engine rpm and load demands.
Particulate Filter Aftertreatment For Tier 4 The Cummins Particulate Filter replaces the muffler in the exhaust stream and offers equivalent noise reduction qualities. The filter is especially strengthened against shock loads and vibration to meet the most severe off-highway operating conditions.
The Particulate Matter collects on the filter and is gradually oxidized by catalytic passive regeneration. With some duty cycles, PM accumulation rate may eventually exceed oxidation rate, and a short active regeneration is initiated by the engine electronic control module utilizing the XPI fuel system and Variable Geometry Turbocharger.
Cummins ability to design, build and integrate the complete Tier 4 QSX engine system from air intake to exhaust aftertreatment offers substantial packaging efficiencies for equipment manufacturers.
"Reducing Tier 4 installation complexity for the equipment manufacturer has been a key aim of our QSX development program and we have been focused on keeping the engine and particulate filter envelope as space efficient as possible," said Susan Harrison, Executive Director, Cummins Industrial Engineering.
"A further benefit of Cummins integration capability is that we can electronically manage the engine and aftertreatment as a single system driven by the electronic control module. The engine ECM will integrate with equipment electronics, including CANbus common area networks for J1939 and ISO multiplexing. This allows electronic systems to talk to each other along a serial datalink and is set to become a more significant feature as we look ahead to equipment designs for 2011," added Harrison.
Direct Flow Air Filtration The QSX is available with the new Cummins Direct Flow air filtration system by Fleetguard, specifically developed for Tier 4 applications. Direct Flow offers a 35 percent smaller installation profile than typical Tier 3 air filtration systems while maintaining the same filtration efficiency. This is accomplished by creating a direct-flow path through the filter media which is packaged in a rectangular configuration rather than a conventional cylindrical shape. The Direct Flow housing includes a sensor to monitor temperature and pressure which sends data to the engine electronic control module to ensure optimum airflow operation.
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 serves customers in more than 160 countries through its network of 550 company-owned and independent distributor facilities and more than 5,000 dealer locations. Cummins reported net income of $739 million on sales of $13.05 billion in 2007.