Engine enhancements will also include the use of Cummins Variable Geometry Turbochargers (VG Turbo), advanced electronic controls and High Pressure Common Rail fuel systems. Common Tier 4 subsystem architecture will extend from the MidRange QSB to the Heavy-Duty QSX engines. Cummins Tier 4 product range will maintain or increase power outputs compared to Tier 3. Fuel efficiency will be improved by up to five percent, dependent on rating and duty cycle. “While exhaust aftertreatment may be new technology for the off-highway industry, it is not new to Cummins. Our Cummins Emission Solutions business is one of the world’s leading manufacturers of this key component technology. For Tier 4 applications of the Cummins Particulate Filter, we are factoring in off-highway requirements such as high-shock loads, angularity, space restrictions and working environment conditions,” said Ric Kleine, Vice President of Cummins Off-Highway Business.Cummins achieved Tier 4 Interim emissions levels by developing the engine combustion recipe to work with the aftertreatment filter in reducing particulate matter (PM) emissions levels by 90 percent. The use of cooled EGR enables the required 45 percent reduction in oxides of nitrogen (NOx) to be achieved. Cummins cooled EGR is an engine-integrated subsystem which has proven to be highly effective working in tandem with Cummins VG Turbo. This provides superior engine response with optimized boost at given exhaust gas recirculation rates and engine speeds. Clean engine credentials will be further enhanced with a Cummins-designed crankcase filter which eliminates escaping blowby gases, oil mist and droplets. Cummins is designing, manufacturing and integrating all key subsystems from the air intake filter system to exhaust aftertreatment. Seamless electronic control of both engine and aftertreatment will be driven from an upgraded engine electronic control module. “Minimizing installation complexity is a key focus of Cummins Tier 4 development program. This is made possible by being able to design and pre-engineer all the key subsystems in-house,” said Susan Harrison, Executive Director, Cummins Industrial Engineering.“Cummins application engineering expertise offers a major advantage for equipment manufacturers looking to upgrade their engine installations for Tier 4. We will offer standardized engine, aftertreatment and air intake packages to speed up installation work and realize space-saving advantages for our customers. “Utilizing the Cummins Particulate Filter and cooled EGR to meet 2011 emissions is the right approach when we look ahead to installation requirements for Tier 4 Final in 2014. With just a three-year interval between Interim and Final, we are preparing for equipment manufacturers to make installation space claims for both Interim and Final technology as they plan for 2011. We are evaluating various NOx-reduction technologies to meet Tier 4 Final when NOx will need to reduce to near-zero levels. We will utilize an incremental technology approach with the least possible installation impact,” added Harrison. www.cummins.com