InfraStructures - May 2013 - All-New QSM12 Engine for Tier 4 Final Revealed at bauma - Canada's National Equipment Magazine - Le Magazine d'Équipement National au Canada

All-New QSM12 Engine for Tier 4 Final Revealed at bauma

Cummins Inc. revealed the all-new QSM12 with up to 512 hp output for heavy-duty applications, at bauma 2013 in Munich. The 12 l engine is purpose-designed to meet U.S. Environmental Protection Agency (EPA) Tier 4 Final and European Union (EU) Stage IV near-zero emissions regulations with a more compact envelope and over 30% higher power- to-weight ratio than the class average for engines with a similar power range.

The new QSM12 brings a major advantage for Tier 4 Final and Stage IV equipment installations by restoring the envelope size of the QSM11 predecessor, used for Tier 3 and Stage IIIA applications. Higher efficiency air handling and advanced combustion enable the QSM12 to return to the simplicity of a wastegated turbocharger and achieve near-zero emissions without the need for a cooled Exhaust Gas Recirculation (EGR) system. As a result, internal loads on the QSM12 are reduced to free up extra power potential, while heat rejection is lowered by over 40% compared with engines using cooled EGR.

A key design focus for the QSM12 has been to achieve significant weight savings in order to increase the power-to-weight ratio. A sculptured block retains high rigidity while removing unnecessary mass. The use of composite material for the oil pan and valve cover provides further weight savings. With this innovative approach, the QSM12 achieves a remarkably low engine weight of just 862 kg while retaining all the structural strength and durability expected of a Cummins heavy-duty engine.

With ratings covering a broad 335 hp to 512 hp range, the QSM12 offers an ideal power solution for a wide variety of applications, including wheel loaders, excavators, cranes and material handling, road building equipment, compressors, screening and crushing machines.

The QSM12 incorporates Cummins Xtra-High Pressure Injection (XPI) fuel system, derived from the larger and more powerful QSX15 Tier 4 Final engine. Although scaled down in size for the 12 l platform, the XPI fuel system retains all the robust, heavy-duty characteristics of the system, proven up to 675 hp on the 15 l.

With multiple injection events driven by high-precision Cummins electronic controls, the XPI fuel system contributes to a very impressive peak torque for the QSM12 of 1,700 lb ft, together with a torque rise as high as 60% available. These attributes enable the QSM12 to deliver exceptionally fast response to increasing load factors from low engine rpm.
XPI plays a significant role in enhancing engine sociability, with lower noise, less vibration and smoother power delivery. The use of a rear gear train also contributes to overall engine refinement by reducing vibration and lowering noise by at least 1 dBA.

The after-treatment combines a Diesel Particulate Filter (DPF) with Selective Catalytic Reduction (SCR) to achieve an ultra-clean exhaust.

The QSM12 is built ready to deal with the toughest operational extremes experienced by off-highway machines. Even working under high load factors, the QSM12 will achieve the same legendary life-to-overhaul as that achieved by the QSM11 at Tier 3 and Stage IIIA. Operators of QSM12-powered machines can expect - and may exceed - 12,000 hours before overhaul. Significantly, no midlife engine overhaul is required.

Cummins DPF-SCR after-treatment system is able to withstand severe shock loads and vibration, designed with durability equivalent to that of the engine. Additionally, the QSM12 can work at 45° angularity with just the standard oil sump fitted.

The QSM12 is specially configured with an array of machine-adaptive features to facilitate machine integration across a diverse range of applications. For example, the Cummins wastegated turbocharger is available in either a rear-out, low-mount position or in a front-out, mid-mount position, to provide added installation flexibility.

Other useful options include a front power take-off (FEPTO) with up to 564 lb ft, a rear power take-off/hydraulic drive (REPTO) with up to 516 lb ft and a side-mounted drive for a hydraulic pump. For machines requiring engine braking, a compression brake option is available, or an integral exhaust throttle can be utilized.

The DPF-SCR ultra-clean after-treatment system used by the QSM12 easily adapts to each specific machine installation space, due to a modular format enabling multiple configurations in both horizontal and vertical orientations.

The QSM12 medium-bore engine fully complements that of the QSX15 big-bore engine, to extend Cummins heavy-duty power range up to 675 hp for Tier 4 Final/Stage IV, with both engines sharing similar DPF-SCR after-treatment technology.

Source: Cummins Inc.