Cummins has announced that its QSX15 and QSX11.9
engines will benefit from higher maximum outputs as the company reveals its
solution for the near-zero emissions levels demanded by Tier 4 Final in 2014.
The 15liter heavy-duty QSX15 engine will produce a
peak of 675hp (503kW) – up 75hp (56kW) on its Tier 4 interim output – as a
result of using a blend of technologies for after-treatment clean-up of
particulate matter and nitrogen oxide. The 11.9liter QSX11.9 engine also
increases power output for Tier 4 Final with a new top rating of 525hp (392kW).
Both engines share the same engine technology, which
combines a Cummins particulate filter with selective catalytic reduction, known
as CPF-SCR.
“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,” said Jennifer Rumsey, executive director at
Cummins Heavy-Duty Engineering.
“The CPF-SCR ultra-clean after-treatment raises the
threshold of what can be achieved in the trade-off between lower emissions and
higher performance,” said Ms Rumsey. “This means we are able to realize the
full power productivity of the QSX engines by precisely balancing emissions
control between the after-treatment and engine combustion with cooled exhaust
gas recirculation and XPI fuel injection.
To
meet Tier 4 Final legislation in 2014, particulate matter (PM) reduces to 0.02
g/kW-hr, and oxides of nitrogen (NOx) reduce to 0.40 g/kW-hr. Compared to Tier
3 emissions levels, these figures represent a 90% reduction for both PM and
NOx.
