Heavy-duty engine

  • 14-May-2013 10:35 EDT
Cummins QSM12.jpg

Cummins Inc.'s all-new QSM12 features up to 512 hp (382 kW) output for heavy-duty applications. The six-cylinder, 12-L engine is purpose-designed to meet U.S. EPA Tier 4 Final and EU Stage IV near-zero emissions regulations. The QSM12 offers packaging advantages 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 a wastegated turbocharger and achieve near-zero emissions without the need for a cooled EGR system; heat rejection is lowered by over 40% compared with engines using cooled EGR. Aftertreatment combines a DPF with SCR, featuring a copper zeolite-based catalyst capable of over 95% conversion of NOx and able to operate more efficiently at lower temperatures with advanced sensors providing full closed-loop control. Weight-reducing measures such as the use of composite material for the oil pan and valve cover help the QSM12 to weigh 1900 lb (862 kg), enabling a power-to-weight ratio of 0.27 hp/lb (0.44 kW/kg). With ratings covering a 335- to 512-hp (250- to 382-kW) range, the QSM12 is suitable for a variety of applications including wheel loaders, excavators, cranes and material handling, road building equipment, compressors, screening, and crushing machines.

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