Volvo Construction Equipment has received interim Tier 4 emissions certification from the Environmental Protection Agency for its D11 11-liter engine. Implementation of IT4 emissions regulations begins Jan. 11, 2011 for engines in the 175- to 750-horsepower range, requiring a 90-percent reduction in diesel particulate matter and a 50-percent reduction in nitrogen oxide.
At the heart of Volvo’s technology is its new generation of electronically controlled diesel engines, using the highly acclaimed V-ACT system with enhanced engine monitoring, greater control capabilities, and higher torque. The EPA-certified engine features exhaust gas re-circulation, which lowers the amount of oxygen in the combustion chamber.
IT4 regulations also require the use of Ultra Low Sulfur Diesel fuel of 15ppm of sulfur, down from 500ppm of sulfur.