Kobelco Construction Machinery America today announced its strategy to meet the Environmental Protection Agency’s Tier 4 
interim emissions requirements that begin in 2011. Introduced in two phases, Tier 4 regulations represent the biggest reduction in heavy equipment emissions to date. Tier 4 final emissions requirements, which take effect in 2014, will reduce particulate matter (PM) and nitrogen oxide (NOx) emissions by 90 percent, compared to Tier 3 requirements.
To address Tier 4 requirements across the full line of Kobelco excavators, the company will rely on two technologies: selective catalytic reduction (SCR) and cooled exhaust gas recirculation (CEGR).
Kobelco developed its SCR and CEGR technologies to ensure that its customers continue to receive the performance, fuel efficiency and reliability they expect from their Kobelco excavators, while delivering substantially reduced emissions required by Tier 4 regulations. The goal is to produce excavators that comply with the new requirements, while continuing to meet customers’ needs for productivity, fuel efficiency and reliability.
The introduction of SCR and CEGR technologies on its excavators in 2011 gives Kobelco significant competitive advantage in terms of the research and development needed to meet Tier 4 final emissions requirements beginning in 2014. The investment in R&D will enable us to focus on developing the next generation of productive, fuel efficient and reliable excavators for our customers.
SCR technology
SCR is a cool-running system that is separate from the main engine function. This technology enhances engine performance without compromising horsepower or torque. The SCR after-treatment system transforms the NOx produced during the combustion process into nitrogen and water, which occur naturally in the atmosphere, through a chemical reaction with a Diesel Exhaust Fluid (DEF).
SCR is extremely fuel-efficient because it allows the engine to generate maximum power and optimizes the combustion process.
CEGR technology
CEGR provides a user-friendly solution without any change in the operation of the machines. This solution relies on an exhaust filter system to remove PM from the exhaust. By lowering the combustion temperature with a partial exhaust gas recirculation system; CEGR also reduces the production of NOx inside the engine.
CEGR provides performance with exceptional durability and low maintenance costs.