Doosan has unveiled
three Tier 4 interim compliant machines and a display engine. The machines are a
DL450 wheel loader, a DX300LC crawler excavator and an MT41 articulated dump
truck. The company said that complete details will be provided later this year
regarding the entire line-up of the Doosan models with compliant engines.
“As 2011 progresses, Doosan will
continue to provide further emission-related information as necessary to keep
our customers informed and educated on our progression through this endeavor,”
said segment application marketing manager Aaron Kleingartner.
Kleingartner
said an engine technology system that Doosan already uses extensively on higher
horsepower engines is high-pressure common rail (HPCR) fuel injection. HPCR was
applied to many Doosan models with Tier 3 compliant engines. It will also be an
enabler for application of further technologies needed for Tier 4 interim and
final compliance, along with cooled exhaust gas recirculation (CEGR), diesel
particulate filters (DPF), diesel oxidation catalysts (DOC) or selective
catalytic reduction systems (SCR).
Currently,
he said, Tier 4 interim compliance for Doosan products with 50-75hp (37-56kW)
engines has already been completed. This because Tier 4 interim emission
standards are less stringent to this range of engine horsepower compared to
higher horsepower engines, and changes required to achieve compliance for
engines in this class were less complex.
On the
other hand, Tier 4 interim compliance for engines in the 75-175hp (56-130kW) class
will not be required until 2012, he said. “Our most immediate concern is iT4
compliance for 175- to 600-horsepower (130-448kW) engines starting this year.”
