Cummins confirms SCR/DPF for Tier 4 Final

Christopher Goodfellow - 23 March 2011

Cummins has announced it will use a combination of Selective Catalytic Reduction (SCR) and a Diesel Particulate Filter (DPF) to meet Tier 4 Final off-road emissions standards.

Jennifer Rumsey, Executive Director at Cummins Heavy-Duty Engineering, said: "The QSX15 and QSX11.9 not only meet the challenge of near-zero emissions, but they are able to achieve this with higher power output and lower fuel consumption."

At Tier 4 Interim emissions levels the QSX15 and QSX11.9 engines are capable of achieving up to 5% improved fuel efficiency compared to Tier 3. Fuel efficiency will be further increased for Tier 4 Final by an additional 3 to 4%.

Cummins' SCR system uses a a copper zeolite-based catalyst capable of up to 95% NOx conversion and able to operate more efficiently at lower temperatures. The system features advanced sensors to provide full closed-loop control. Diesel Exhaust Fluid (DEF) dosing levels are minimized with enhanced mixing in the decomposition pipe, according to a statement from the company.

The Cummins Particulate Filter (CPF) is retained from the Tier 4 Interim aftertreatment used by the QSX engines. The CPF incorporates 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. The integration of SCR into the exhaust aftertreatment allows the CPF to reduce the frequency and duration of active regenerations below 1% of equipment operating time, creating a virtually full-time passive device.

The Environmental Protection Agency's Tier 4 Final emissions standards will apply to larger off road vehicles from 2014, reducing particulate matter emissions to 0.02 g/kW-hr and oxides of nitrogen (NOx) to 0.40 g/kW-hr.

Emissions analyst Integer Research has released a Focus Report: SCR and the Non-Road Mobile Machinery (NRMM) Market, which gives further details on the global off-highway sector and the impact of new emisions regulations.

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