John Deere on Final Tier 4/Stage IV Engine Technology Path
- Published: Monday, 23 April 2012 17:33
John Deere announced the continuation of its planned building-block approach to meet United States Final Tier 4 and European Union Stage IV emissions regulations. Final Tier 4/Stage IV regulations for off-highway diesel engines begin as early as 2013 for engines 55 kW (74 hp) and below.
Regulatory dates for engines 56 kW (75 hp) and above will be implemented in stages starting in 2014 and 2015, and require particulate matter (PM) levels established by Interim Tier 4/Stage III B regulations to be maintained while requiring an additional 80 percent reduction in nitrogen oxides (NOx) from previous regulations.
To meet Final Tier 4/Stage IV emissions regulations in some power categories, John Deere developed the Integrated Emissions Control system – an optimized after-treatment solution paired with the performance-enhanced, fuel-efficient Interim Tier 4/Stage III B engine platform, featuring proven cooled exhaust gas recirculation (EGR). The John Deere Integrated Emissions Control system will typically consist of a diesel oxidation catalyst (DOC), diesel particulate filter (DPF) and a selective catalytic reduction (SCR) system specifically designed to meet the rigorous demands of off-highway applications. John Deere will continue to tailor its Integrated Emissions Control system configurations to fit a variety of off-highway applications.
“At John Deere, we continue to offer the right combination of technologies at the right time to meet increasingly stringent emissions regulations and customer needs,” said John Piasecki, director of worldwide marketing, sales and customer support for John Deere Power Systems. “Exhaustive research and testing determined that an application-specific SCR system that is well integrated with our proven Interim Tier 4/Stage III B engine platform will be the best solution to achieve Final Tier 4/Stage IV emissions compliance while delivering the power, performance, ease of operation, fluid efficiency, reliability and economical operating cost that our customers expect from John Deere.”
Consisting of an exhaust filter and SCR after-treatment components that are optimized and fully integrated, the Integrated Emissions Control system will allow John Deere engines to utilize less diesel exhaust fluid (DEF) than alternative Interim Tier 4/Stage III B SCR technology solutions. Lower DEF consumption means DEF tank size can be smaller – minimizing the impact on vehicle applications, extending DEF filter service intervals and reducing operator involvement. Monitored and controlled by proprietary electronics within the John Deere enhanced engine control unit (ECU), the Integrated Emissions Control system also provides outstanding fluid efficiency without sacrificing overall performance.
Like the John Deere approach to previous tiers, its Final Tier 4/Stage IV technology solution has been designed to consider overall performance and operating efficiency, which takes into account total fluid consumption including diesel fuel and additional fluids such as DEF. John Deere Final Tier 4/Stage IV engines will operate efficiently with traditional ultra low-sulfur diesel as well as biodiesel 5 to 20 percent (B5-B20) blends meeting applicable ASTM standards, providing optimal performance and fuel choice flexibility.