20/04/2012 - 04:00 am

John Deere Displays Final Tier 4/Stage IV Engine at Intermat

John Deere Power Systems, Waterloo, Iowa, exhibited its PowerTech PSS 9.0L Final Tier 4/Stage IV diesel engine featuring the Integrated Emissions Control system this week at Intermat.

U.S. Final Tier 4 and E.U. Stage IV emissions regulations for mobile off-highway diesel engines 56 kW (75 hp) and above will be implemented in stages starting in 2014 and 2015. These standards maintain the particulate matter (PM) levels established by Interim Tier 4/Stage III B regulations while requiring an additional 80 percent reduction in nitrogen oxides (NOx) from previous regulations.

John Deere will continue with its planned building-block approach to meet the challenging Final Tier 4/Stage IV regulations. To achieve compliance, John Deere developed the Integrated Emissions Control system—a solution that optimizes engine performance, operating efficiency, and reliability.

For engines 75 hp and above, the Integrated Emissions Control system will consist of a diesel oxidation catalyst (DOC), a diesel particulate filter (DPF) and a selective catalytic reduction (SCR) system specifically designed to meet the demands of off-highway applications. The DOC/DPF exhaust filter reduces PM, while cooled EGR and the optimized SCR system reduce NOx to the regulatory levels of Final Tier 4/Stage IV.

“From the onset of emissions regulations, John Deere has focused on incorporating emissions-reduction technologies that meet applicable regulations while maintaining or improving performance,” said John Piasecki, director of worldwide marketing, sales and customer support for John Deere Power Systems. “SCR is an appropriate technology building block for Final Tier 4/Stage IV, now that it is more mature for off-highway applications, the DEF supply chain infrastructure is better developed, and John Deere has optimized the performance of our SCR system.”

Piasecki said the building-block approach led to the Integrated Emissions Control system and an optimized Final Tier 4/Stage IV technology solution that the company is confident will deliver emissions compliance without sacrificing power, performance, ease of operation, fluid efficiency, reliability, durability or economical operating cost.

“John Deere Final Tier 4/Stage IV engine performance will meet or exceed that of our Interim Tier 4/Stage III B engines,” he adds. “John Deere engines will continue to provide the same or higher levels of power density and torque along with transient response that meets or exceeds that offered with Interim Tier 4/Stage III B engines.”

According to John Deere, it attained a world-class fuel economy position with its Tier 3/Stage III A engines. Since then, the company has continued to demonstrate industry leadership by developing solutions that consider not only fuel economy, but also total fluid economy. Total fluid economy takes into account an engine’s total fluid consumption, including diesel fuel and additional fluids such as diesel exhaust fluid (DEF).

When combined with cooled EGR technology, the Integrated Emissions Control system will enable John Deere engines to meet emissions requirements while utilizing less DEF than alternative Interim Tier 4/Stage III B SCR solutions. DEF consumption with John Deere Final Tier 4/Stage IV engines will be 1 to 3 percent of diesel fuel consumption depending on the application. Lower DEF consumption means DEF tank size can be smaller—minimizing the impact on vehicle applications while extending DEF filter service intervals and reducing operator involvement. Increased pressures created by John Deere’s Final Tier 4/Stage IV high-pressure fuel systems will reduce engine-out PM and extend intervals between an active exhaust filter regeneration, improving fuel economy from Interim Tier 4/Stage III B.

“With low DEF dosing rates and a higher-pressure fuel delivery system, John Deere Final Tier 4/Stage IV engines will meet or improve upon the total fluid economy of Interim Tier 4/Stage III B engine models,” Piasecki said. “Our enhanced electronic control unit (ECU) monitors and controls the engine and Integrated Emissions Control system, providing superior fluid efficiency without compromising performance.”

John Deere has an established record of reliability since becoming one of the first engine manufacturer to widely commercialize cooled EGR and variable geometry turbocharger technologies in 2005. John Deere has also accumulated nearly 5 million operating hours with DOC/DPF exhaust filter technology implemented for Interim Tier 4/Stage III B, and employs a dedicated in-house after-treatment team working with a mature exhaust filter and SCR supply chain to provide a field-proven Final Tier 4/Stage IV solution.

Final Tier 4/Stage IV regulations for engines below 56 kW (75 hp) begin as early as 2012. In this power range, John Deere will offer models that meet Final Tier 4/Stage IV regulations using an Integrated Emissions Control system consisting of an exhaust filter without cooled EGR or SCR.

For Final Tier 4/Stage IV, John Deere will offer its familiar PowerTech displacements of 2.9L, 4.5L, 6.8L, 9.0L and 13.5L. Power ratings throughout the lineup will, in some cases, be higher than previous offerings.

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